4-Channel 5V OMRON Solid State Relay Module – 240V 2A with Resistive Fuse

This 4-channel solid state relay (SSR) module is built around the OMRON G3MB-202P relay and is designed to interface low-voltage control signals from microcontrollers such as Arduino and AVR boards with higher-voltage AC loads. Each of the four independent channels can switch up to 2 A at 240 V AC, making the module suitable for controlling lighting, small appliances, and other AC-powered equipment in automation and prototyping projects. Because the switching element is a phototriac-based solid state relay, the module operates without moving contacts, resulting in silent operation, no contact bounce, and a significantly longer service life compared to conventional mechanical relays. The module is equipped with a resistive-type fuse on the output side for protection against overcurrent conditions, and each channel provides separate NO, COM, and NC terminals for flexible wiring configurations. The control inputs are compatible with 5 V DC logic, and the board features a high-level trigger design, meaning the relay is activated when a high logic signal (typically 3.3–5 V) is applied to the corresponding input channel. The module is supplied with a 5 V DC power input rated at approximately 160 mA and uses standard 2.54 mm pins and blue KF301 screw terminals for convenient connection to control circuitry. With its compact dimensions of 57 × 55 × 25 mm and a net weight of 40 g, the module can be easily integrated into existing control panels, smart building installations, and protective equipment setups.

1. Controlling at least four independent electrical devices or AC loads.
2. Smart building and home automation systems.
3. Protective and safety equipment requiring isolated switching.
4. Arduino, AVR, and other microcontroller-based automation projects.
5. Lighting control and small appliance management in industrial or laboratory environments.

1. Relay model: OMRON G3MB-202P solid state relay (4 channels).
2. Input power supply: 5 V DC, approximately 160 mA.
3. Output switching voltage: 240 V AC at 2 A per channel (with resistive fuse).
4. Control signal voltage: Low level (0–2.5 V) – relay OFF; High level (3.3–5 V) – relay ON (high-level trigger).
5. Channel terminals: NO (Normally Open), COM (Common), NC (Normally Closed) per channel.
6. Protection: Resistive-type fuse on the output side (240 V, 2 A).
7. Dimensions: 57 × 55 × 25 mm (length × width × height).
8. Net weight: 40 g.
9. Connectors: 2.54 mm pins and blue KF301 screw terminals.