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Ningbo Liming Relay, located at No. 986 Zhongguan Road, Jiaochuan Street, Zhenhai District, Ningbo City, Zhejiang Province, was established in 1996. It covers an area of 13.7 mu and has over 200 frontline workers, 15 technical R&D personnel, 22 sales staff, and a 10-member e-commerce team. The company mainly engages in the design, development, and sales of relays, switch components, winch accessories, automotive modification parts, outdoor off-road, and rescue and recovery series products.

‌PCB Relay 12V DC
This article provides detailed information on the contact data and operating conditions of PCB RELAY 12VDC, including their specifications, performance parameters, and environmental requirements,

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Why Choose Us

Rich Experience

Founded in 1996, It covers an area of 13.7 mu and has over 200 frontline workers, 15 technical R&D personnel, 22 sales staff, and a 10-member e-commerce team.

Advanced Equipment

The company operates automated assembly and testing equipment, including relay automatic testers, laser marking machines, and automated assembly lines. These systems help ensure stable production processes and reliable product consistency.

Sales Market

Our products are exported to Europe, North America, Australia, Japan, South Korea, and other global markets. Years of cooperation with international customers have helped us understand the quality, documentation, and service expectations of overseas buyers.

Overview of PCB Relay

A PCB (Printed Circuit Board) relay is a compact, electrically operated switch designed for direct mounting onto circuit boards, usually via through-hole pins. It uses a low-power signal to control a high-power circuit, offering electrical isolation, and is commonly used in automotive, industrial automation, and household appliances.

Product Specification

We offers the following product specifications:

Model Number	SRD-12VDC-SL-C
Coil Power	12V DC
Pin Out	5 Pin - Coil - COM - NC - NO
Nominal Coil Power	0.36w, 0.45W
Contact Capacity	10A 250VAC/10A 125VAC 10A 30VDC/10A 28VDC
Insulation Resistance	100MΩ.500VDC
Operate Time	15ms/10ms
Terminal Type	PCB
Contact Load	High Power
Product name	12V DC Electrical Relay SRD-05VDC-SL-C
Contact Ratings	1A,1C
Contact Resistance	100mΩ(at 10A 5VDC)
Contact Material	Silver Alloy
Size	Miniature
Protect Feature	Sealed

Product features

High voltage/current carrying capacity
Designed for high voltage (e.g. 220V AC/DC in industrial control) and high current (10A+) applications to ensure stable switching of power loads.
Typical applications: Motor control, power distribution systems, electrical cabinet protection.

Semiconductor Technology (Solid State Relay/SSR)
Non-contact design: Electronic switching through semiconductors (e.g. MOSFETs, thyristors), no mechanical wear, and longer life.
Low interference: Avoid sparks and electromagnetic noise of traditional relay contacts, suitable for precision electronic equipment.
Applicable scenarios: High-frequency switching (such as PLC signal control), explosion-proof environment.

Delay trigger function

Built-in time relay module, action delay can be set (e.g. 0.1s~10s) for timing control or preventing false triggering.
Example: Motor soft start, equipment power failure buffer protection.

Temperature protection (thermal relay)

Integrated temperature sensor or bimetal to automatically disconnect the circuit when the ambient/load temperature exceeds the threshold value (e.g. 85°C).
Protection objects: Power modules, transformers, high-power semiconductor devices.

Frequency protection (AC system specific)

Monitors AC frequency (e.g. 50/60Hz) and triggers tripping when abnormal (±5% offset) to prevent equipment damage.
Typical applications: Generator grid-connected protection, inverter output monitoring.

Application

Power Supplies
PCB relays control the switching of power supplies, turning on and off, controlling different types of outputs, and power distribution. They assist in maintaining the flow of power for devices in their system to ensure that they get the appropriate voltage and current.

Motor Control Systems
PCB relays play a significant role in motor control systems. They are used to start, stop, and reverse motors, providing precise control over motor operation. This application is essential in industrial automation, where motors drive various machinery and equipment. The reliability and efficiency of PCB relays make them ideal for controlling motor functions and ensuring smooth operation.

Security Alarm Systems
Applications for PCB relays are in security alarm systems, which provide system alertness according to input signals from various sensors. With sensor input indicating an intrusion or any other security breach, the relay will trigger the alarm to alert the security system or the personnel.

Data Acquisition Systems
Typically, in data acquisition systems, PCB relays are essential to route signals for measurement effectively. In other words, they switch the different signal paths, which enables the system to pull data from different sensors and input points.

Internet of Things (IoT) Devices
PCB relays bring about the actuation of end devices and interfacing with sensors in the burgeoning IoT fast lane. They make the physical world receptive to these IoT devices, which enable anything that acquires data to guide actions.

Precautions for Mounting

When installing printed circuit board (PCB) relays, some precautions should be taken to ensure optimum performance and avoid damage to the relay.

It's important to make sure the PCB is clean and free of debris. The relay should be mounted on a clean, level surface to avoid short circuits and ensure proper contact between the relay and the PCB.

It is also important to consider static electricity when mounting PCB relays. To avoid damaging sensitive components inside the relay, it is best to discharge static electricity from your body before operating the relay.

When mounting the relay, be sure to use the correct mounting hardware and torque specifications. Installing the relay incorrectly can damage the PCB and cause a short circuit or malfunction.

Always follow the manufacturer's instructions and guidelines when installing the relay onto the PCB to ensure proper installation and operation.

It is important to use proper tools and techniques when soldering or connecting the relay to the PCB to avoid accidental damage or mistakes.

Other Services

Wide Relay Custom Choices

AC/DC 24V-240V, Monitoring + Overcurrent/Undercurrent/Both, Specific monitoring function options and so on.

Reliable Supply

Laboratory validation; end-to-end QA; technical after-sales support from selection to assembly by technicians and business experts.

Mini Size

Each piece is 18mm wide and fits a 35mm DIN rail for easy installation or replacement.

High Efficiency

The lead time for direct warehouse transfers—including unique exterior light customization—is 10~15 days.

Certifications

Package & Delivery

Package: Standard export package or Custom.
Delivery: By air express, by sea.

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FAQ

Q: Can PCB relays handle high currents?

A: Yes, PCB relays can handle high currents, but limits vary. Some relays can manage 16 A or more. Always check the relay's details to ensure it fits your circuit's needs.

Q: How do you test a PCB relay?

A: To test a PCB relay, apply the right voltage to the coil. Check if the contacts open or close properly. Use a multimeter to measure resistance across the contacts. If the relay doesn't work, it might need replacing.

Q: What causes PCB relays to fail?

A: Relays fail due to overheating, too much current, or wear. Bad soldering or moisture can also cause problems. Regular checks and maintenance help prevent these issues.

Q: How do you determine the right contact rating for a power relay?

A: Consider requirements both in terms of current load and operational longevity. Rule of thumb is select a relay where rated current falls between 50% to 80% of intended load current to avoid overheating contacts. Also ensure contact material and switch ratings exceed the target device operating cycles by at least 4X for margin and wear effects.

Q: When should you use a solid state relay instead of an electromechanical relay?

A: For applications needing fast, no-bounce quiet switching, extended mechanical lifespan exceeding 50 million operations, operation in high shock/vibration environments, or very small PCB footprint, solid state relays are preferable despite higher on-state resistance and limited overload capacity. Electromechanical types are favorable where high current loads or fail-safe operation is must.

Q: Can you drive a 12V relay coil directly from a microcontroller?

A: While possible, it is not recommended, as back EMF voltage spikes from the collapsing magnetic field in the relay coil on switch-off can easily damage GPIO pins. Always use a protection diode across the relay coil. For 24V or higher coils, a buffer transistor stage is required for reliable operation.

Q: How do you test a relay on a PCB?

A: Basic relay testing validates coil actuation and contact closure electrically. Use a DMM to check coil resistance & energization voltage/current. Monitor relay contact closure timing relative to coil power, and validate open/closed contact resistance values fall in expected ranges.

Q: What special considerations apply for selecting automotive grade PCB mount relays?

A: Key considerations for auto relays include extended temperature rating -40°C to +125°C, protection against voltage transients typical in vehicle systems, higher current contacts to manage surge loads, low emission housings compliant with headlamp switching devices, and additional testing/qualification covering humidity, vibration, and mechanical shock.

Q: Are you manufacturer or trading company?

A: We are manufacturer.

Q: What's your best delivery time?

A: Within 15-30 days.

Q: What is the quality control of your product?

A: Follow strictly quality control measures for implementation.

Q: Will your company provide free sample?

A: It depends on which sort of item you want to get. Some can be provided free of charge, however, the client shall assume the shipping fees himself.

Q: What is the payment of sample?

A: T/T and Alipay both acceptable.

Q: What is your packing?

A: Yes, our packaging is genuine original packaging. Of course, we can also provide neutral packaging or according to your requirements.

Q: Have you tested all your goods before shipment?

A: Yes, we will conduct 100% test before delivery, and we will send detailed photos of parts for your approval.

We're well-known as one of the leading pcb relay manufacturers and suppliers in China, also support customized service. With a professional production team, we are able to meet the needs of the majority of our customers. Please rest assured to wholesale high quality pcb relay in stock here from our factory.

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