PC board relays are essential components in electronic circuits, acting as electrically operated switches. Selecting the correct relay ensures reliable operation and longevity for your electronic projects and devices. Understanding the key specifications will help you make an informed decision for your specific needs.
Looking for the best PC Board Relays?
Discover now our comparison of the best PC Board Relays. It is never easy to choose from the wide range of offers. On the market, you will find an incalculable number of models, all at different prices. And as you will discover, the best PC Board Relays are not always the ones at the highest prices! Many criteria are used, and they make the richness and relevance of this comparison.
To help you make the best choice among the hundreds of products available, we have decided to offer you a comparison of the PC Board Relays in order to find the best quality/price ratio. In this ranking, you will find products listed according to their price, but also their characteristics and the opinions of other customers. Also discover our comparisons by categories. You won’t have to choose your products at random anymore.
No. 1
VACUFLO 7090 PC Relay Board
- VACUFLO PC RELAY 7090 Vacuflo board part number 7090 replaces relay assembly for VACUFLO models 260, 360, 460, 466Q, 560, 566Q , DB3000, DB5000, DB7000, DB8000, Maxum 5, Maxum 7, MX2500
- Easy to change out yourself
No. 2
AEDIKO 4pcs DC 5V Relay Module - 1 Channel Relay Switch Board with Optocoupler Isolation, High or Low Level...
- 5V Relay Module: Working Voltage: DC 5V; Maximum Load: AC 250V/10A, DC 30V/10A; Trigger Current of Opto-Isolator: 5mA
- Fault-Tolerant Design: Fault Tolerant Design, Even if the Control Line is Broken, the Relay will not Operate;All Interfaces of Relay can be Wired Out Through the Terminals Directly,Normally Open and Normally Closed
- Optocoupler Isolation:1 Channel Relay Board use Optocoupler Isolation that has Strong Driving Ability and Stable Performance ,The Isolation Circuit Prevent Damages to I / O Port by Relay Switch Current
- Jumper Design: The Relay Module has a Jumper That You Can Set Rather the Unit State Changes with High or Low Signal. Has Screw Terminals for Relay (NC,C,NO) and for Input; Coil +, Coil - and Trigger.
- Wide Application: DC 5V Relay Module Works Well with ARM /PIC /AVR /MCU/Raspberry/CNC Machine/ PS4 etc.
No. 4
Relay T9AS1D12-12 (Set of 2), 12VDC 30A SPST-NO PCB Power Relay - Versatile for PC Board or Panel-Mounted...
- Reliable Power Relay: The T9AS1D12-12 relay is a reliable power relay designed for various applications. It offers a single-pole, single-throw normally open (SPST-NO) configuration, providing efficient electrical control.
- Flexible Mounting Options: This relay is suitable for both PC board and panel-mounted applications. Whether you need to integrate it into a printed circuit board or mount it directly onto a panel, the T9AS1D12-12 provides flexibility in installation.
- Robust Construction: With its durable construction, the T9AS1D12-12 relay ensures long-lasting performance. It is built to withstand demanding conditions, offering stable operation even in challenging environments.
- High Current Rating: This relay is capable of handling high currents up to 30A. It provides reliable switching for a wide range of electrical loads, making it suitable for applications with higher power requirements.
- 12VDC Operation: The T9AS1D12-12 operates at 12VDC, compatible with standard electrical systems. It provides a reliable voltage for optimal performance, ensuring efficient electrical control.
No. 5
ANMBEST 2PCS 4 Channel 5V Relay Module with Optocoupler High or Low Level Trigger Expansion Board for...
- It is 4 Channel Isolated 5V 10A Relay Module, each relay can individually switch on/off by an opto-isolated digital input, Standard interface can be directly connected with microcontrollers and be controlled directly by a wide range of microcontrollers...
- Equipped with high-current relay, maximum load: AC250V 10A, 15A 125VAC, DC30V 10A; Trigger current of opto-isolator: 5mA.
- RELIABLE: Fault-tolerant design, even if the control line breaks, the relay will not move; With optical coupling isolation, triggering more reliable, more stable.
- EASY to INSTALL: Equipped with screwed terminal plate and fixed bolt holes(diameter: 3.1 mm) on both sides for easy installation.
- High/Low level trigger can be selected by jumper. Very versatile, you can reverse the input logic with the jumper.
No. 6
Walfront USB 8 Channel Relay Module DC 12V Programmable Relay Board with Type-B Interface for Home Automation...
- When the board is connected to the PC and the PC is restarted, the relays will be toggled several times. This is because of the structure of the chip
- The device must be supplied with 12 VDC to work
- Extra PCB openings for better voltage isolation
- Doubled high current tracks
- There is no against reversed voltage! If the VCC(+12V) and GND are reversed the board will be damaged
No. 7
Aexit 20pcs Plastic Relays Vertical Mounting PCB Board Guide Rail PC Board Relays Supporting Holder
- Product Name : PCB Board Guide Rail;Material : Plastic
- Mounting Design : Vertical Mounting;Fit forPCB Board Thickness : 2mm/ 0.08"
- Slot Size : 120 x 2 x 3mm/ 4.7" x 0.08" x 0.12" (L*W*Depth);Positioning Hole Center Distence : 17mm/ 0.67"
- Total Size : 127 x 23x 17mm/ 5" x 0.9" x 0.67" (H*L*W);Color : Gray
- Weight : 159g;Package Content : 20 xPCBBoard Guide Rail
No. 8
G8P-1A4P Fully-Sealed PCB Relay (Set of 2) 12VDC 30A - 4Pins 30A 250VAC Relay for PC Board or Panel-Mounted...
- Fully-Sealed PCB Relay: The G8P-1A4P relay is fully-sealed, providing excellent protection against dust, moisture, and other environmental factors. It is designed for reliable performance in various applications, including PC board or panel-mounted...
- High Current Rating: With a robust current rating of 30A, this relay is capable of handling high electrical loads. It ensures efficient power distribution and reliable operation in demanding applications, such as solving the F01 code problem in dryers.
- 4-Pin Configuration: The G8P-1A4P relay features a 4-pin design, allowing for secure and efficient electrical connections. The pins are designed for easy installation on PC boards or panels, ensuring compatibility and hassle-free setup.
- 12VDC Coil Voltage: Operating on a 12VDC coil voltage, this relay is compatible with standard electrical systems. It provides a stable power source for efficient operation and reliable control of electrical components.
- Welding Capability: The solder wire on the bottom of the relay make it easy and reliable welding. This feature ensures a strong and secure connection for optimal performance.
No. 9
G8P-1A4P Fully-Sealed PCB Relay 12VDC 30A - 4Pins 30A 250VAC Relay for PC Board or Panel-Mounted Applications...
- Fully-Sealed PCB Relay: The G8P-1A4P relay is fully-sealed, providing excellent protection against dust, moisture, and other environmental factors. It is designed for reliable performance in various applications, including PC board or panel-mounted...
- High Current Rating: With a robust current rating of 30A, this relay is capable of handling high electrical loads. It ensures efficient power distribution and reliable operation in demanding applications, such as solving the F01 code problem in dryers.
- 4-Pin Configuration: The G8P-1A4P relay features a 4-pin design, allowing for secure and efficient electrical connections. The pins are designed for easy installation on PC boards or panels, ensuring compatibility and hassle-free setup.
- 12VDC Coil Voltage: Operating on a 12VDC coil voltage, this relay is compatible with standard electrical systems. It provides a stable power source for efficient operation and reliable control of electrical components.
- Welding Capability: The solder wire on the bottom of the relay make it easy and reliable welding. This feature ensures a strong and secure connection for optimal performance.
No. 10
8-Channel I2C IIC Relay Board XL9535, USB-C, Dual Power 3.3V/5V, SPDT 10A EMR, DIN-Rail Ready, Multi-Board I2C...
- 8 I2C-Controlled EMR Relays (10A Rated) – Features eight SPDT mechanical relays driven by the XL9535 GPIO expander. Each channel switches up to 10A @ 250VAC or 30VDC—ideal for lighting, pumps, motors and AC/DC loads.
- Dual Power Mode for 3.3V & 5V MCUs – Use single-5V mode for Arduino, or dual-power mode for ESP32/ESP8266/Raspberry Pi (3.3V for logic, 5V for coils). Ensures safe I²C voltage levels and strong relay performance. Type C / USB-C Port available to power...
- Noise-Reduced Stable Operation – Separate logic and relay power rails (VIN/GND1 vs. 5V/GND2) prevent voltage dips, MCU resets, and I²C communication errors—critical in smart home and industrial systems.
- Multi-Board I2C Expansion (Up to 64 Relays) – DIP switches allow selecting 8 unique I²C addresses (0x20–0x27). Daisy-chain up to 8 boards on one SDA/SCL bus, enabling 64 individually addressable relay channels.
- DIN-Rail Friendly & Maker Ready – Includes USB-C power input, high-quality screw terminals, clear labeling and a compact 150×72mm design. Fully compatible with Arduino, ESP32, ESP8266, Raspberry Pi, Home Assistant and ESPHome. Example code available on...
- On board:Includes easy-to-use connectors and detailed instructions, making installation and setup quick and hassle-free for electronics enthusiasts of all levels
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Last update on 2026-04-05 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best PC Board Relays
Understanding Relay Types
- Electromechanical Relays (EMRs): These are the most common type, using an electromagnet to operate a mechanical switch. They offer high current handling and isolation but can be slower and generate noise.
- Solid-State Relays (SSRs): SSRs use semiconductor devices to switch loads, offering faster switching speeds, no moving parts, and longer life. However, they may have higher on-resistance and limited current capacity compared to EMRs.
Key Specifications to Consider
- Coil Voltage: This is the voltage required to energize the relay's coil and activate the switch. Ensure it matches your control circuit's voltage.
- Contact Rating: This includes the maximum voltage and current the relay contacts can safely switch. Choose a rating that exceeds your load requirements to prevent damage.
- Number of Poles and Throws: Poles refer to the number of independent circuits the relay can control, while throws indicate the number of circuit states (e.g., Single Pole Single Throw (SPST), Single Pole Double Throw (SPDT)).
- Contact Material: Different materials (like silver alloy, gold plating) offer varying levels of conductivity, resistance to arcing, and suitability for different load types (resistive vs. inductive).
Environmental Factors
- Operating Temperature: Relays have a specified temperature range for reliable operation. Consider the ambient temperature of your application.
- Vibration and Shock Resistance: For applications in harsh environments, look for relays designed to withstand physical stress.
Mounting and Form Factor
- Through-hole vs. Surface Mount (SMD): Through-hole relays are soldered into holes on a PCB, while SMD relays are mounted directly onto the surface. Your PCB design will dictate the appropriate type.
- Size and Pinout: Ensure the physical dimensions and pin configuration are compatible with your board layout.
Frequently Asked Questions
What is the difference between Normally Open (NO) and Normally Closed (NC) contacts?
Normally Open (NO) contacts are open when the relay coil is de-energized and close when the coil is energized. Normally Closed (NC) contacts are closed when the coil is de-energized and open when the coil is energized.
How do I determine the correct coil voltage?
The coil voltage must match the voltage supplied by your control circuit. Using an incorrect voltage can prevent the relay from operating or damage it.
What is a relay's switching speed?
Switching speed refers to how quickly the relay can change its contact state from open to closed, or vice versa. This is particularly important for applications requiring rapid on/off cycles.
Can I use a relay for AC and DC loads?
Some relays are designed for AC loads, some for DC, and others are universal. Always check the relay's specifications to ensure it's rated for your specific load type (AC or DC) and voltage/current.
What does 'contact bounce' mean?
Contact bounce is a phenomenon where relay contacts physically rebound and make/break contact multiple times for a brief period when switching. This can cause signal glitches in sensitive digital circuits.
How do I protect a relay from voltage spikes?
For inductive loads, a flyback diode or a snubber circuit across the relay coil or contacts can help suppress voltage spikes generated when the coil de-energizes.
