Your Ultimate Relay PCB Manufacturer in China

Your Best Relay PCB Supplier

PCBMay is one of the most reliable relays PCB manufacturers in China. We have rich knowledge and skills to design you premium-quality microchips and electronic component products.

Our relay PCB is 100% guaranteed providing long-lasting performance. As an expert supplier, PCBMay provides specific solutions according to your needs.

PCBMay manufacture relay PCB perfect for industrial equipment, household equipment, power supplies, FA equipment, electrical household appliances, the energy market, and more. If you belong to any of these industries, know that you’re in the right place to be.

Our series of relay PCBs feature superior performance in high-capacity load switching in the power supply; to single contact structure and contact arc. They have automatic adjustments for changing circuits protecting any electrical equipment.

PCBMay relay PCB is applicable for different equipment such as AV devices, refrigerators, CCTV, timer, washing machine, etc. They have met various safety standards like enhanced insulation between coil contacts. Whether you need a relay PCB for business or personal projects, PCBMay will provide the best solution for you.

PCBMay manufacture relay PCB with high functionality and high efficiency. Using our advanced manufacturing system, we can manufacture excellent performance products. Can be reliable for any purpose.

We have strict control of your relay PCB production. W offer no minimum order requirement for relay PCB; if you only need one piece to check the product’s quality first, you can. We can assure you that this product will meet your high expectations.

PCBMay has strict quality control. We test every relay PCB we manufacture in mechanical strength and efficiency. Our company has a solid technical force to ensure that the product’s quality is at its peak.

As an ISO9001 certified company, PCBMay stands as your one-stop solution for relay PCB. We are capable of providing all your needs to boost your company in the market.

If you need more information about our relay PCB, feel free to send your inquiries anytime.

Relay PCB: The Ultimate FAQ Guide

A Relay PCB is the most suitable option for you if you are looking for a circuit that fulfills multiple applications.

But if you do not have much information about Relay PCBs and want to gather more information about them, continue reading this guide, and you will find the answers to all your queries.

What is a Relay PCB?

Relay PCBs are versatile output devices that are available in a wide variety of forms, lengths, and layouts and can be used in a number of electronic appliances.

It is a system of circuits that operates with the help of switches that are managed either electronically or electromechanically and are responsible for producing a variation in voltage.

It is a device that enables you to update the signals that are received from a circuit as it passes the signal through an additional circuit.

Standard Relay PCBs use electromagnets to regulate the opening and shutting of circuits, while contemporary Relay PCBs use semiconductors for the same purpose.

Relay PCB

What are the Advantages of a Relay PCB?

Relay PCBs play sort of an all-rounder role as they are responsible for a number of functions and are advantageous for a better operation.

Some of their advantages would include the following features:

• They possess the ability to perform well even when they are subjected to extreme temperatures.
• They usually get triggered with a little current themselves, yet they have the capability of controlling much bigger electronic appliances.
• They allow you to control multiple connections at the same time with the help of a single signal.
• You can also decide to switch between either direct current or alternating current, depending on your requirement and working condition.
• They are helpful in circuit control, particularly when you are using a signal with minimum and independent power.
• Another beneficial aspect of Relay PCBs is that they come in handy when you require several connections to be controlled by a single signal.

What are the Different Kinds of Relays That are Adopted in a Relay PCB Assembly?

There are many different kinds of relays that can be adopted in a Relay PCB assembly, which are classified based on their structure, contacts, application, and positioning.

Following are some of the distinctive kinds of relays adopted in Relay PCB assemblies:

• Electromagnetic relays

An electromagnetic relay is comprised of electrical as well as mechanical components that work together to produce elements that move mechanical contacts when the relay is activated.

In order for a wire-wrapped coil to magnetize, electricity must be sent through it, which results in the opening or shutting of contacts.

When utilizing an electromagnetic relay, you have the option of using either a direct current or an alternating current operating voltage.

The attraction type and the induction type are two of the most common kinds of electromagnetic relays.

• Solid-state relays

The switching application of solid-state relays is accomplished via the use of semiconductor elements rather than moveable mechanical elements.

In comparison to electromagnetic relays, these relays have a greater power gain owing to their lower control energy in relation to their higher output power.

Solid-state relays, which include transformer-coupled relays and photo-coupled relays, offer quicker switching capabilities than conventional relay PCB assemblies and are also used in a variety of applications.

The absence of contacts in solid-state relays guarantees that noise levels are kept to a bare minimum and that their useful service life is prolonged.

• Hybrid relays

It is a system that includes electrical and electromagnetic elements together, which operate in parallel positioning.

The electrical aspect of the input is where rectification takes place, whereas the electromagnetic aspect is responsible for the output section.

Heat dissipation in a hybrid relay reduces the power loss seen in solid-state relays, thus reducing their power consumption.

• Thermal relays

Thermal relays work by reacting to temperature changes by shifting the position of the contacts, allowing them to perform switching actions.

An evident shift in temperature causes the contacts to react by adjusting their location in relation to the shift in temperature.

Thermal relays are used as control components in order to protect motors as well as bimetallic features which include temperature sensors.

Different kinds of relays adopted in a relay PCB assembly

What Components are Required for Mounting in a Relay PCB?

A PCB mount relay is comprised of mainly two circuits, which are the energizing and contact circuits.

In order to successfully mount these circuits in a Relay PCB, you will require the following primary components:

• Frame

In addition to forming the structure of the Relay PCB with its stiff structure, the frame is also responsible that holding and supporting the relay structure.

• Coil

A coil is created by wrapping a wire around a metal object and is used to produce and perform in an electromagnetic field.

• Armature

The moveable portion in a Relay PCB that allows for the opening and closing of circuit contact makes up the armature.

A return spring is used to make certain that the armature is restored to its original position after each movement.

• Contacts

The contacts are responsible for carrying out voltage transmission in the circuit through the opening and closing of the circuit.

Components of a Relay PCB

How does a PCB Mount Relay Operate?

In the energizing circuit, you will get to notice the coil which is aligned with the contacts running alongside the circuit.

When a current is allowed to flow, an electromagnet is formed by the wire-wrapped coil, which creates a magnetic field in the process.

It is possible to open or shut the contacts by using a magnetic field that operates through a metal plate that is connected to the armature.

The break count, pole count, and throw count of the relay may be used to control the contacts of the relay in various ways.

PCB mounted relay board kit

What is the Main Difference Between a Relay PCB and a Relay Module?

A Relay PCB is responsible for generating variations in voltage in order to operate circuits either through electromagnetic conductivity or by employing a solid-state mechanism.

A relay module is made up of several Relay PCBs, as well as additional circuit components, which include equipment like resistors, transistors, and diodes.

The main difference between a Relay PCB and a relay module is that in a Relay PCB, an individual relay can only operate a single circuit.

Hence, if you have several relay PCBs that you need to operate, you should employ numerous circuits at the same time.

Whereas you can use a relay module when you need to operate numerous circuits, even when they are all derived from a single circuit.

Relay module

What are the Different Ways to Connect a Relay Terminal to a Relay PCB?

In order to connect a relay to the circuit board, it is necessary to configure the pin terminals in one of the following manners:

• _COIL

In this setting, you have to provide negative voltage into one end of the coil that is connected to the terminal, which causes power to be supplied to the other end of the coil.

• COIL

In the same way, increasing the voltage applied to one end of the coil results in increasing the power applied to the other end of the coil.

• NO, which stands for “Normally Open”

When the relay receives enough voltage to power up, it will turn on immediately upon connecting.

When there is no power, the PCB is turned off, and when power is applied to the relay, the PCB is turned on.

• NC, which stands for “Normally Closed”

When power is applied to the relay, the terminal is instantly connected to the PCB.

When there is no power supplied to the relay, the circuit remains operational, switching off when power is restored.

Connection of relay terminals

Does a Relay PCB Provide You With a Standard Switching Capacity?

When determining the switching capacity or a total load of a relay PCB assembly, the voltage and current utilized need to be taken into consideration.

It is important to note that the voltage referred to here implies the terminal load voltage that you would encounter in an open relay circuit.

In contrast, the current referred to here implies the terminal current that flows between the load and the relay that you would encounter when the circuit is shut.

Relay PCBs provide you with both the minimum and maximum switching capabilities and it is up to you to decide which one to opt for.

It is essential for you to ensure that the Relay PCB assembly has a minimum switching capacity in order for it to provide you with a lengthy and useful service.

It is unavoidable that over time, matter builds upon the armature contacts with consistent use of Relay PCB.

When you have a small quantity of current flowing through the relay circuit, it burns the matter buildup at the armature contacts when the circuit is closed.

Which Safety Standards Should be Necessarily Followed While Constructing a Relay PCB?

Choosing the safest and most suitable material for your Relay PCB requires following a criterion that includes two safety standards through which the selection process proceeds.

These evaluations are based on the breakdown voltage of the material and also its performance when exposed to conditions with high voltage.

The two safety standards are as follows:

• IPC-2221 Voltage And Spacing Standard

It is specified in the IPC-2221 that the clearance and creepage criteria of the relay PCB assembly need to be fulfilled, among other things.

This standard provides the material criteria as well as the trace factors that are required for producing a high-quality circuit board.

You can also use this standard to calculate the smallest possible spacing for your circuit board in order to ensure optimal performance.

This may be accomplished by calculating high voltage clearance from the safety standard.

• IEC-60950-1 (2nd Edition)

The IEC-60950-1, the second edition, deals with Relay PCBs that use either a direct current or an alternating current power source.

It provides requirements for sufficient circuit board spacing in order to avoid signal interference and arcing, both of which may cause serious damage and injury.

What is the Meaning of NO and NC in a Relay PCB?

A relay can be basically referred to as a switch as it allows you to switch the poles by moving the contacts, which is accomplished by the conduction of current in the coil.

When current is transferred via the relay coil, it may be set to one of two positions: Normally Open (NO) or Normally Closed (NC).

When the relay is activated, it is in the NO position, allowing the circuit to be connected through the contacts.

When you disconnect the relay by turning off the current source, you separate the contacts from the PCB, thus terminating the circuit.

This circuit is also referred to as an early-make contact due to the fact that the contacts are closed even before the switches are fully engaged.

A Normally Closed (NC) circuit is one in which the contacts separate when the relay is activated by a current source.

When the supply of current to the relay is interrupted, the contacts of the relay instantly connect, hence, completing the circuit.

This circuit is also referred to as a late-break contact due to the fact that it maintains closed contacts until the switches are completely disengaged.

NO and NC relays

What are the Different Applications for Which You Can Use a Relay PCB?

A Relay PCB depicts diversity in the application as it can be used in common daily objects such as a heater, lamp, or some sort of a motor to more complicated devices such as high-tech security systems.

Some common applications for Relay PCBs are as follows:

• Industrial application

They are used as a control device in industrial equipment, which commonly includes welders, machine tools, molders, and robots.

They prove to be efficient for industrial use as they possess the ability to function in switching lines and control systems.

• Household application

You can utilize them in your homes in order to create garage shutters and lighting equipment, among other things.

They are also used to operate compressors, motors, and pumps in appliances like refrigerators, air conditioners, and washing machines.

• Power supply applications

Relay PCBs are used to regulate the power supply in electrical appliances such as uninterruptible power supplies (UPS) and switching power supplies.

• Security applications

A PCB relay may be used as an alarming device and is used in a variety of warning systems, including anti-burglary devices and fire detection systems.

• Automation applications

Relays are used in a variety of automation applications, including operating robots and performing various tasks in industrial settings.

Also seen in homes and business buildings is the automation of utility meters like gas meters and water meters, which are used to measure consumption.

Many contemporary buildings have also included automated elements which include lighting and air conditioning, which are made possible by Relay PCB assemblies.

Relay PCB used in lighting and power supply

What is the Contact Life of a Relay PCB?

The relay contacts on Relay PCB assemblies govern the duration of the efficacy of its functioning.

When the contacts begin to wear out, it becomes necessary for you to replace either the contacts of the circuit board or purchase a new circuit board altogether.

When discussing the mechanical and electrical life of a Relay PCB, it is important to examine both its mechanical as well as its electrical life.

The mechanical life is referred to as the total number of contact operations performed when the relay is not powered by electricity.

Opening and closing activities are a part of these contact operations.

They have a long-lasting mechanical life that continues for about one million operation cycles, which is very impressive.

On the contrary, the maximum amount of contact operations performed when electrical power is supplied at a given rating to the relay is referred to as its electrical life.

When compared to the mechanical life of contacts, their electrical life is usually shorter, with a minimum cycle of 100,000 ranging to fewer than a million cycles.

Can You Purchase Used Relay PCBs?

Most manufacturers sell used Relay PCBs as well as used parts of the Relay PCB and you can definitely buy them, if necessary.

However, their condition needs to be verified, and you should ensure that you do not get ripped off.

If an old or used Relay PCB is still operational, you may reuse it by simply desoldering it from its previous circuit board.

You may further resolder the old Relay PCB onto a new circuit board since they are designed to resist severe soldering temperatures.

Moreover, the components of an old Relay PCB, such as its coil windings, contacts, and fasteners, may be utilized for new circuit boards even if the old Relay PCB is not functional.

For example, coil windings may be used to create jumper wires in various circuit configurations, amongst many of its other usages.

Used relay PCB

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

Solid-state Relay PCBs are well known for their industrial as well as commercial applications as industries usually require devices that possess smaller footprints.

Some of the additional reasons why you should opt for a solid-state Relay PCB for your industrial applications include the following:

• They have a long and effective service life, which is ideal for you.
• They possess minimum bounce or arch in contacts as they consist of immovable contacts.
• They provide you with the feature of zero-crossing.
• Their power input is quite low; hence you would not lose much energy while utilizing them.
• They possess a high level of resistance against shocks and vibrations, which also reduces movement.
• They also provide more room than other PCBs as they allow you to utilize either single or dual in-line package mountings.

Solid-state relay PCB used in industrial applications

What Factors Should You Consider While Purchasing a Relay PCB?

When purchasing a Relay PCB, you must take into consideration your working circumstances as well as the mounting method that you will utilize.

The load and surge current, as well as the operating temperature and airflow along with the required size and spacing, are all critical parameters to consider before purchasing a Relay PCB.

Spacing is required in order to disperse the extra heat generated by high current transfers.

If left unaddressed, these dissipations may have a detrimental effect on the operation of other relays in the same assembly.

Some further aspects to consider during the purchase of Relay PCBs are as follows:

• You must check if the activating input voltage is the same as what you require in the input circuit in order for it to work.
• You should also pay attention to the amount of current flowing in the circuit.
• You should check the flow of voltage and current or of a load-switching circuit.
• You should decide whether you want to use alternating current voltage or direct current voltage.
• It is also important for you to measure the thermal resistance of the Relay PCB as it guarantees minimal heat dissipation and efficient management of the system.
• You should opt for the usage of zero-crossing hardware in order to turn the voltage on or off along with a zero alternating current voltage.
• When it comes to current output, the resistance or the voltage drop of the Relay PCB are also important factors to be considered.

What are the Different Testing Procedures for a Relay PCB?

When you test a relay PCB, you may assess its operational condition by detecting any issues that may be connected with it.

The following tests may be performed on a Relay PCB to ensure that it is functioning properly:

• Coil resistance test:

The resistance capability of the coil is critical in order to establish the operating voltage as well as the current value of a Relay PCB.

To determine the coil resistance, you may use a multimeter to calculate the current and voltage.

• Contact resistance test:

Contact resistance is the sum of the resistance values of the NC and moveable contacts in a given configuration.

Using a multimeter that is set to resistance mode, which must be zero, you may determine whether or not there is any contact resistance.

• Pull-in voltage and current test

The pull-in voltage and current can be tested by providing voltage to a relay and controlling it with a regulating power supply.

Keeping track of the power being supplied with the help of an ampere meter is necessary as you progressively raise the voltage.

As soon as you hear a pull-in sound, you record the pull-in voltage and current of the circuit.

It is necessary to repeat the procedure many times in order to get a more precise result.

• Release voltage and current test

When it comes to testing release voltage and current, the procedure is quite similar to the pull-in voltage and current test.

You require raising the voltage in pull-in voltage and current test, whereas, in release voltage and current test, you require lowering the voltage until you hear the sound, and then record the voltage and current figures that are obtained.

In most cases, you will discover that the release voltage is between ten and fifty percent as compared to the pull-in voltage.

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