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Solid State Relay G3MB-202P-5VDC 4 Pin 2A 240VAC

Description of G3MB-202P Solid State Relay 

The G3MB-202P is a Solid state relay with a load handling capacity of up to 100-240V AC. G3MB-202P uses the photocoupling principle for the actuation of the relay module. SSR like G3MB-202P are faster, creates no noise, and have a longer lifespan as compared to an electromagnetic relay.


Features and Specifications of G3MB-202P Solid-State Relay 

This section mentions some of the features and specifications of the G3MB-202P Solid State Relay Module:

  1. Operating voltage: 5V
  2. Current rating: 7-20mA
  3. Maximum load: 2A at 240V AC
  4. Built-in snubber circuit


Pin configuration of G3MB-202P Solid State Relay 

Below is the pin configuration of the G3MB-202P Solid State Relay.

Pin Number/Type

Pin Description






5V positive terminal




Alternatives for G3MB-202P Solid State Relay

RS PRO 25 A, LH1500AT, A03B 1


Equivalents to G3MB-202P Solid State Relay



Note: More technical information can be found in the G3MB-202P Datasheet linked at the bottom of this page.


Working of G3MB-202P Solid State Relay

A solid-state relay works on a different principle than other EMR relays. The SSR relays are made up of semiconductors and not mechanical parts and work by isolating a low-voltage circuit from a higher voltage circuit with the help of optocouplers. As per the basic working of an optocoupler, whenever the control input is given to the SSR relay, the internal LED lights up and produces a light signal which is received by a photosensitive semiconductor which then converts light energy into electrical energy and switches the circuit. These kinds of relay operate at high speed and have low power consumption.


Connecting G3MB-202P Solid State Relay to an MCU/MPU

Connecting a G3MB-202P Solid State Relay to a microcontroller/microprocessor is pretty easy. The relay requires a high/low signal to operate(to switch).

G3MB-202P Solid State Relay with MCU

The 3(+) pin can be connected to a digital pin of the MCU/MPU and the 4(-) to the ground, The load to be controlled via the relay can be connected to the relay’s 1 and 2 pins as shown in the image below. A simple program for digital write can be written and the bulb can be controlled using the SSR.


Note: Some of the G3MB-202P Solid State Relay boards might come with the Low-level trigger label, which means that the relay will switch when a low(0) signal is provided to it


Applications of G3MB-202P Solid State Relay

Here are some of the applications of G3MB-202P Solid State Relay-

  1. Used for controlling multiple circuits
  2. Isolating low voltage from high voltages
  3. Automatic changeovers
  4. Electrical appliances ON/OFF applications


2D Model of G3MB-202P Solid State Relay

Below is the 2D model of the G3MB-202P Solid State Relay along with its dimensions in millimeters. The following details can be used to design custom footprints and be used while designing PCB or CAD modeling.

G3MB-202P Solid State Relay Dimensions

Note: All the dimensions are in millimeters.

Component Datasheet

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