Relay Control PCB

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Which Kind of a Relay PCB Should You Opt for Your Industrial Applications?

1.They have a long and significant service life, which is ideal for you.

2.They possess minimum bounce or arch in contacts as they make of immovable contacts.

3.They offer you with the feature of zero-crossing.

4.Their power input is very low; hence you would not lose much energy when utilizing them.

5.They possess have a high level of resistance against shocks and vibrations, which also decrease movement.

6.They also offer more room than other PCBs as they permit you to utilize either single or dual in-line package mountings.

Relay PCB

What Factors Should You Consider While Purchasing a Relay PCB?

1.You must need to check if the activating input voltage is the same as what you demands in the input circuit in
order for it to work.

2.You should also pay more attention to the amount of current flowing in the circuit board.

3.You should inspect the flow of voltage and current or of a load-switching circuit.

4.You should make up your mind whether you want to use alternating current voltage or direct current voltage.

5.It is also necessary for you to measure the thermal resistance of the Relay PCB as it guarantees

What are the Different Testing Procedures for a Relay PCB?

1.Coil resistance test:
The resistance capability of the coil is critical in order to build the operating voltage and the current value of a Relay PCB. To determine the coil resistance, you may need to use a multimeter to calculate the current and voltage.

2.Contact resistance test:
Contact resistance is the sum of the resistance values of the NC and moveable connect in a given configuration.
Using a multimeter that is build to resistance mode, which must be 0, you may need to determine whether or not there is any contact resistance.

Different Testing Procedures

Your Best Relay Control PCB Partner

Relay Control PCB

We are a professional Relay Control PCB design supplier in China for over 10 years of experience. We render our valued customers the very great products at the most affordable pricing. Venture can also supply other design that is related to Relay Control PCB such as:

  • 4-Channel Relay Control PCB
  • 8-Channel Relay Control PCB
  • 3-Channel Relay Control PCB
  • Twin Relay Control PCB
  • 8-Channel Wireless Relay Control PCB
  • IP Relay Control PCB

Your Leading Relay Control PCB Supplier in China

Venture Relay Control PCB is built for different circuit board use. We are a professional Relay Control PCB supplier design in China for over 10 years. VentureRelay Control PCB has exceptional performance and long-lasting. This is only the exposed PCB. It combines the benefits of the structure that render more extra isolation for the great voltage tracks.

Relay Control PCB

Venture Relay Control PCB is an increased mechanical strength at connector sites and in plated-through holes. It concedes you to change in a great high voltage. Venture Relay Control PCB is widely utilized in different industries. You can use our Relay Control PCB for circuit board and etc. Also, use conveniently our Relay Control PCB into different uses.

Relay Control PCB

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Relay Control PCB

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Relay Control PCB

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Relay Control PCB: The Ultimate FAQ Guide


In this guide, you will find all information you’re looking for about Relay Control PCB.

So, if you want to be an expert in Relay Control PCB, read this guide.

What is A Relay Control PCB?

A control relay PCB is an electromagnetic construction that functions as a switch allowing flow of electrical current via a coil.

The conducting coil initiates the closing and opening of a circuit thereby functioning as a switch.

You also find a relay control useful in the protection of current in a circuit.

Furthermore, with a relay control, you don’t have to manually regulate the circuit state via a switch.

Relay controls are common components in electronic devices powering motors, transistor systems, power plants and supply units.

Relay PCB

Relay PCB

What Are Some Of The Relay Control PCB Types?

There are different types of Relay Control PCBs depending on factors such as the principle of operation and the construction.

You also describe some relay controls depending on their intended operation as specialized relays.

Common types of the Relay Control PCB include:

Solid State Relays

The solid state relay PCBs lack mechanical and moving parts in their construction. Consequently, you find these relay type employs electronic components when executing switching operations.

Electromagnetic Relays

The construction of electromagnetic relay PCB type involves mechanical parts where electric current creates magnetic effect.

The relay consists of a coil furnished over a metal core with a contact pairing employing AC or DC voltage source.


A contact is a large type of Relay Control PCB you employ for switching high value electrical power via a contact pairing.

Thermal Overload Protection Relay

The thermal overload protection relay PCB utilizes thermal effect observable in electrical energy applications.

Here, the opening and closing of the circuit is due to a temperature increase resulting from a continuous flow of current.

The temperature increase affects the expansion of a bimetallic strip which results in opening the circuit.

A decrease in temperature returns the strip to its original position, closing the circuit.

How Does Relay Control PCB Work?

The working of a Relay Control PCB depends in its construction. A common Relay Control PCB construction is the electromagnetic relay control.

The electromagnetic relay PCB composes a contact pair, a conduction coil furnished over a metal core and a voltage source. When using an electromagnetic relay control, you control a high current circuit using a low current circuit.

In such a relay, an electrical current from the voltage source through the conduction coil creates an electromagnetic field.

As a result, the switch closes completing the circuit and allowing the flow of electrical current.

In the absence of an electrical current, the conduction coil demagnetizes losing the magnetic field. Consequently, the switch reverts to former position and hence opening the circuit.

What Are The Contact Types You Employ In A Relay Control PCB?

With a Relay Control PCB, you have different contact types available for use.

Relay Control PCBs encompass poles and throws which define the type of contact you achieve.

Poles are an indication of the circuit count whose control is by a switch.

On the other hand, throws are indicative of all the positions the switch can undertake.

You have the following common contact types employable in a Relay Control PCB:

Control relay PCB

Relay Control PCB

Single Pole Single Throw (SPST)

You find two terminals you can connect and disconnect with this contact type. Additionally, you have another terminal pair for the coil giving a total of four for the Relay Control PCB.

Single Pole Double Throw (SPDT)

In this construction, you have a common terminal with which you can connect to another single terminal or pairing. You also have the coil terminal pair making a total of five.

Double Pole Single Throw (DPST)

The double pole single throw is equivalent to a pair of SPST whose activation is induced by a coil.

Add another pole pairing for the coils and you have a total of six terminals.

Double Pole Double Throw (DPDT)

The DPDT equates to having a pair of SPDT with a single coil for activation. When you add the two terminals associated with the coil you have eight terminals in all.

What Is The Difference Between NO And NC Contacts In Relay Control PCB?

NO refers to Normally Open which indicates a contact state where you have current flow upon energizing of the relay PCB.

In this case, upon application of a voltage, the contacts close allowing the passage of current.

NC refers to Normally Closed applicable where there is no relay energizing but with current flow across the contacts. In a Normally Closed state, the contacts separate cutting off flow of current.

Normally open and normally closed in circuits

Normally open and normally closed in circuits

How Does The Relay Control PCB Compare To Contactors?

A Relay Control PCB and a contactor have a similarity in roles seeing as you employ them both in circuit switching.

In fact, you sometimes find contactors referred to as large Relay Control PCBs.

However, you find points of difference in the two on several grounds such as:

  • Whereas Relay Control PCBs can carry loads of at most ten amperes, contactors can carry loads exceeding this figure.
  • You find contactors only operate in NO state while Relay Control PCBs operate in both NO and NC states.
  • You find auxiliary contacts present with contactors aiding in additional functionality but absent in Relay Control PCBs.
  • There are several features you find in contactors absent in Relay Control PCBs due to the large load carrying capacity. These safety features include arc suppressors, spring-loaded contacts and overloads.
  • While Relay Control PCBs find employment in single-phase applications, you find contactors employed in three-phase applications.

Where Do You Employ Relay Control PCBs?

You find the Relay Control PCB employed across different industries in electronic functions.

The Relay Control PCB finds use in the following:

  • Heating, Ventilation and Air-Conditioning equipment.
  • Cleaning equipment such as automated car wash machine.
  • Refrigeration and anti-condensation units.
  • Automat4d food production equipment such as coffee machines and snack dispensers.
  • Power supply equipment.
  • Industrial systems involved in counting and sorting.

What Are The Main Parts Of Relay Control PCB?

There are different types of Relay Control PCBs classified by their construction resulting in different parts.

Considering a Relay Control PCB of electromagnetic construction, you find it encompasses an armature, spring, yoke, contacts and coil.

The coil forms the heart of the electromagnetic Relay Control PCB consisting a wire wound coil over a metal core. The yoke is metallic part that path with low reluctance for the magnetic flux.

Additionally, the armature is a metallic part that is movable and attached to the yoke via a hinge. Furthermore, you can link the armature mechanically to a single or multiple contact pairing.

A spring keeps the armature in position ensuring an air gap doesn’t form in the magnetic circuit upon relay de-energizing.

Consequently, when this happens you observe closing of one contact pairing and the opening of the other paring.

You can find multiple contact sets depending on application while also connecting the armature and yoke with a wire.

Such a connection ensures circuit continuity between the relay and the PCB’s circuit trace.

Control relay PCB

Relay Control PCB

What Is Double Winding Latching Relay Control PCB?

In a double winding latching Relay Control PCB, you have two input pulses: for the set coil and the reset coil.

The input pulse of the set coil maintains the operating condition of the relay mechanically magnetically. On the other hand, the input pulse of the rest coil positions the relay PCB into a reset state.

What Happens To Relay Control PCB Used In Circuits With Continuous Power?

Employing a Relay Control PCB in a circuit with continuous power for an extended duration is damaging.

It increases the chance of weakening the relay’s coil insulation as a result of overheating.

You need to provide a non-energized design for the Relay Control PCB in case of high intensity usage. Such cases include circuits for error evaluation or in alarm devices where resetting only occurs upon indication of fault.

How Do You Check The Operation Status Of Relay Control PCB?

You employ visual and/or mechanical indicators to evaluate the operating status of your Relay Control PCB.

Visual indicators are typically built-in and show the distribution of rated power to the coil.

When using built-in indicators, you observe the operation status by an LED or using neon or incandescent light.

Contrarily, using a mechanical indicator involves using armature movement to move the display board.

Does The Number Of Contacts In Relay Control PCB Influence Performance?

Yes, it does.

You find twin contacts offer you more performance reliability as opposed to single contacts. You credit this to the parallel redundancy that twin contacts offer.

Moreover, you can further increase the performance reliability of the contacts by employing a gold plating.

Similarly, using bifurcated crossbar contacts with a gold cladding will positively influence performance.

Control relay PCB

Relay Control PCB

Which Are The Best Relay Control PCB Materials?

There are different types of Relay Control PCBs you employ in different applications. Consequently, you can employ a diverse range of materials for your Relay Control PCB for best performance reliability.

Some of the PCB materials you can employ are:


Silver offers you high thermal and electrical conductance and low contact resistance for your Relay Control PCB.

However, interaction with sulfide gas at low voltage and current creates a film that hampers the contact.

Silver Palladium

When you use silver palladium material, you achieve an increased resistance to corrosion and formation of sulfide film.

However, this material can absorb organic gas and result in polymer formation when employed in dry circuits. You can mitigate the negative effects of employing silver palladium by coating it with gold material.

Silver Nickel

The conductive capability of using silver nickel in your Relay Control PCB rivals that of plain silver. Furthermore, you find silver nickel offers your Relay Control PCB exceptional arcing resistance property.

Silver Tin Oxide

You observe excellent deposition quality when using silver tin oxide. However, like plain silver material, you find silver tin oxide susceptible to formation of sulfide films.

Silver, Tin And Indium

Combining silver, tin and indium offers your Relay Control PCB impressive resistance to wear and deposition of metal.

Silver Tungsten

When you combine silver and tungsten, you achieve a material with high melting point and hardness.

Subsequently, you find this material useful in making Relay Control PCBs with high temperature rise.

Furthermore, silver tungsten provides increased resistance to arcing and thermal transfer. However, you experience increased contact resistance while its environmental durability is wanting.

Does The Supply Current Affect Relay Control PCB’s Contacts?

When the contacts to your relay are open or close, the current you supply has a great resulting effect.

For instance, where you have a motor as a load, the current size is directly proportional to the contact wear.

Furthermore, the effect on contact transfer is similar with deposition and locking occurring resulting in damaged contacts.

You can also have situations where the applied current exceeds the relay control’s rated current with a DC voltage source.

Such a connection is susceptible to shorts resulting in arcing ultimately negatively affecting the relay’s switching capacity.

What Affects The Electrical Durability Of Relay Control PCB?

The electrical durability refers to the electrical aspects conducive for the optimal performance of a Relay Control PCB.

You find a relay’s electrical durability affected by the following factors:

  • Coil drive circuit which describes the rate voltage you apply to the coil.
  • Load type typically the rated load.
  • Switching frequency provided according to prescribed ratings.
  • Switching phase where you have an AC load.
  • Ambient atmosphere as provided by the test conditions of the JIS standard.

Can You Use Surge Suppressors For Relay Control PCBs?

When you employ surge protectors for your Relay Control PCB, you increase the durability of the contacts.

Additionally, surge suppressors reduce the likelihood of producing nitric acid and carbides.

The success of using surge suppressors depends on the actual load conditions you subject to during operation.

Thus, you can find zero effects or adverse effects resulting from the characteristic of the relay or load nature.

Sometimes, suing a surge suppressor can result in the increase of the breaking time of a Relay Control PCB.

However, this is also dependent on the load conditions you have during the operation.

Wi Fi Relay Module

WiFi Relay Module

What Affects The Maximum Voltage Of A Relay Control PCB?

In a Relay Control PCB, maximum voltage is specific to the coil and influenced by two major factors.

You find increase in the coil’s temperature and the insulation material’s heat resistance as the two factors.

Where you exceed the insulation material’s heat resistance, the coil burns while the layer shorts. You need to operate within the parameters provided to prevent thermal deflections, insulation loss, fires and risk of shock.

How Does Infrequent Switching Affect A Relay Control PCB?

You need to perfom intermeittent tests of cointinuity on contacts where you employ microloads and infrequent switching.

Infrequent switching results in layering and film formation on the surface of the contacts thus destabilising them.

Where you have infrequent switching and microloads, using gold-clad and bifurcated crossbar contacts safeguards the contacts from damage.

Additionally, you have to design the circuit such that you protect it from contact deterioration and damage.

Furthermore, when conductioing the periodic tests, you need to consider the load type and environmental factors affecting operation.

How Does Reverse Polarity Of Coils Affect Relay Control PCB?

Making appropriate relay PCB connections, requires you to examine the terminal numbers individually and the provided polarities for source power.

Where you have relays equipped with surge protectors or operation indicators, connections with reverse polarities can be catastrophic.

Where you interchange polarities to the coil power supply, you can experience damage and failure of the diodes and indicators.

Furthermore, apart from malfunctioning, you can have damage attached components due to shorts.

When you employ permanent magnets for your polarized relay’s circuits, they fail to operate upon reversal of power supply polarities.

What Is The Effect Of Using DC Relay controls PCBs With Insufficient Coil Voltage?

Insufficient application of voltage to the coil results in operational instability for the relay or no operation at all.

Consequently, you observe operational deficiencies such as welding of the contacts and a drop in their electrical durability.

For instance, consider a large motor employing a large applied current for your load.

Here, you can observe a voltage drop on the coil upon a large current supply when you power the load.

Additionally, operating a Relay Control PCB with insufficient voltage can cause it to breakdown. The breakdown can occur at instances far below those provided in the datasheet such as mechanical shock and vibration.

Consequently, you need to always use the rated parameter values such as the coil’s supply voltage.

How Does Voltage Fluctuation Affect An AC Controlled Relay Control PCB?

For your relay control to function as needed, you supply the rated voltage to the coils without large fluctuations. Where you continuously supply insufficient voltage to your Relay Control PCB, excess heating can occur leading to damage.

Sometimes, other circuit features such as transformers, meters and solenoids share the same supply line as the Relay Control PCB.

In this case, you observe a drop in the voltage amount supplied to the Relay Control PCB.

Consequently, the relay control exhibits vibrations while the contacts can burn up or weld to each other. This is especially common where you connect a mini-transformer to the relay control or use an extended wire length.

Additionally, employing wiring cables with small radial measurements can result in relay malfunctioning. You can remedy the situation by addressing the voltage fluctuation by employing a synchroscope.

Furthermore, you can convert your circuit to DC bias and employ a capacitor in absorbing the voltage fluctuations. Using special relay PCBs with features supported by the operating environment is also a feasible solution.

What Happens When You Store Relay Control PCBs In Corrosive Gas Environments?

Corrosive gas environments include atmospheres containing organic gas, sulfidizing gas and gases containing silicone.

When storing or operating Relay Control PCBs, you should avoid such environments.

When you store Relay Control PCBs in corrosive gas atmospheres, the contact surfaces deteriorate.

Consequently, you experience contact instability where the surfaces get obstructed and the soldering qualities of the terminals tarnished.

More specifically, atmospheres containing silicone elements result in the formation of silicon oxide on the contact surfaces.

The oxide layer on the surface of the contacts impedes the functioning of the contacts resulting in failure.

How Can You Protect Relay Control PCBs From Corrosive Environments?

You can lower the adverse effects of corrosive environments to the Relay Control PCB. Undertaking the following measures on parts of the Relay Control PCB is useful:

  • You can use a sealed packing structure for your Relay Control PCB’s housing. Doing this prevents direct interaction with the corrosive elements in the atmosphere.
  • For the main relay structure, you can employ a plastic or hermetic seal. You find a hermetic seal for your relay control especially useful in preventing the effects of silicone.
  • Applying a coating on your Relay Control PCB surface is also helpful in mitigating against surface deterioration from the corrosive agents.
  • You can also apply gold plating to your Relay Control PCB’s connectors to prevent formation of oxide layers.

What Are Some Of The Guidelines Of Mounting Relay Control PCBs?

When mounting Relay Control PCBs, you need to adhere to the following guidelines:

Audio volume relay attenuator

Audio volume relay attenuator

  1. When soldering, do not solder the tab terminal. Doing so may tamper with the relay structure while also causing flux penetration to the contacts causing failure.
  2. You should maintain the case and avoid cutting the terminals, otherwise you might lose the relay PCB’s operational qualities.
  3. Never try to reuse a deformed terminal after repair as it causes application of unnecessary force on the relay. Use of such force results in the loss the Relay Control PCB’s former performance qualities.
  4. Turn off the coil’s power supply before executing a wiring procedure or replacement on the relay for safety.
  5. During coating or packing procedures for the relay, ensure the coating or resin doesn’t escape into the relay structure. Such a leakage can result in malfunctions and even contact failure especially where you have silicone traces.

What Should You Consider When Mounting Multiple Relay Control PCBs?

During Relay Control PCB mounting, you need to liase with the product catalogue for details such as the required mounting space.

Spacing is important since mounting multiple relay controls on a PCB can result in excess heat production.

Furthermore, you can experience a great heat rise on a PCB when you mount multiple relay controls.

Therefore, you need to provide enough spacing and clearance between relays and other board members during mounting.

Adequate spacing and clearance ensures you have no heat buildup on the board surface. Additionally, this allows you to maintain the Relay Control PCB temperature within the desired range of operation.

Another essential consideration is the potential interference resulting from the interaction of magnetic fields created by individual relay controls.

You can execute tests on the relays to establish the strength of their magnetic fields for use in mitigation actions.

How Do You Reduce Noise In Relay Control PCBs?

You find noise generation prevalent during load switching when a surge occurs at the contacts like in motors.

Furthermore, you observe noise generation where you employ high frequency patterns due to mutual interference.

You can mitigate the noise in Relay Control PCBs by considering the following in pattern design:

  • Avoid placing the patterns for signal transmission and contacts close.
  • Use patterns with reduced lengths to prevent noise generation.
  • You can construct patterns for ground connections to block circuit generation of noise.
  • Include countermeasures for noise when undertaking designs for high-frequency patterns and shape of lands.

What Are The Recommended Parameters For Soldering Relay Control PCBs?

The soldering process serves to attach the relay control onto the board surface.

When conducting soldering, you have two options: automatic soldering or manual soldering.

When carrying out automatic soldering for relay controls for PCBs, the following parameters are essential:

  • The soldering temperature should be about 250 °C.
  • The soldering time should not exceed five seconds which can be divided in two strokes of two and three seconds.

On the other, hand, a manual soldering process requires the following:

  • Soldering tip temperature should be between 280 and 300 °C.
  • Rating of your soldering iron should range between 30 and 60 W.
  • Soldering time should not exceed three seconds.

How Do You Replace A Relay Control PCB?

When replacing the Relay Control PCB, the following guidelines are useful:

  • First, you need to discontinue power supply to the relay by turning OFF.
  • Ensure you use the appropriate removal tools specific to the relay control.
  • When inserting relays, you ensure a formidable connection by fitting them straight into their sockets.
  • You cannot replace high reliability relay controls and as such provide a direct board connection.
  • When replacing relays, ensure you use relays similar in voltage rating.
  • Where you have polarized terminals, make sure you have the correct orientation.
  • Only use a voltage source within the required range of working voltage and not more or less.
  • Avoid use of relays with other parallel connected loads to the coil and in the event of power surges.

What Environments Are Not Ideal For Relay Control PCB Installation?

When installing a Relay Control PCB, there are certain environments not ideal for the process. You find such environments can result in the malfunctioning of the relay or even damage.

The following locations are unfavorable for Relay Control PCB installation:

  • Where you have humidity levels higher than the working range.
  • Locations with a significant atmospheric presence of corrosive gas.
  • Where you have temperature fluctuations that can result in condensation.
  • Where you have an excess of dust particles and metal powder.
  • Where the surrounding temperature is in excess of the required operating temperature of the Relay Control PCB.
  • Where your installation platform is exposed to direct sunlight.
  • Locations susceptible to vibrations and mechanical shock that can hamper the relay control unit.

How Do You Troubleshoot A Relay Control PCB?

A relay consists of different parts like the coil, armature, contacts and core which can encounter problems from time to time. Such problems usually stem from external factors affecting operation and you can mitigate their effect by undertaking certain measures.

Some of the common problems and their interventions include:

Control relay PCB

Relay Control PCB

Coil Burning

Coil burning can occur due to the application of an unfavorable voltage and the occurrence of a short.

You can troubleshoot the error by examining the coil terminal voltage and using the suitable voltage as rated. Additionally, ensuring the atmospheric temperature is within the operating range can mitigate the issue.

Contact Failure

Formation of oxide layers on the contact surfaces, abrasion, aging and inappropriate handling can result in contact failure.

In mitigation, you need to ensure the temperature is within the operating range and specific to a relay. You can also confirm the contact’s service life and avoid physical shocks such as vibrations and repeat soldering.

Contact Welding

The contacts can weld together due to excess load and switching frequency and shorting in the load circuit.

Furthermore, humming can cause abnormal switching resulting in contact welding as well as aging.

You can address the problem by examining the load circuit and capacity and establishing the switch count.

Additionally, address humming and ensure the use of the appropriate contact ratings.

For all your Relay Control PCB, contact Venture Electronics now.

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