A solid-state relay is a mechanical relay controlled by a digital signal. This relay doesn’t generate noise but it has a longer lifespan as compared to other mechanic relays. The main benefit of this relay is that it can be easily switched by a low voltage. In addition, this relay can be switched very fast due to no moving contacts for longer periods without wearing out. This article discusses an overview of the g3mb-202p solid state relay or G3MB-202P SSR, its working, and its applications.
What is the G3MB-202P SSR?
The g3mb-202pis a 5V 8 channel solid state relay module that performs like a mechanical relay by allowing you to control higher-voltage based AC loads from low voltage DC control circuitry. This relay has up to 100 to 240V AC load handling capability and it uses the photocoupling principle mainly for the activation of the relay module.
G3MB-202P SSR is a reliable solution mainly for high-voltage AC load switching. This relay provides flawless control through its 12VDC input & 240V AC 2Amps output. It can also offer a reliable switching mechanism mainly for a variety of electronic applications due to durability & efficiency.
G3MB-202P Solid State Relay
This is a versatile component appropriate for home automation, industrial automation, etc. It provides superior reliability & longevity as compared to traditional electromechanical relays with its solid-state design. So, its robust construction and compact size will make it perfect for integration into a broad range of electronic systems and projects.
G3MB-202P SSR ensures smooth operation and exact AC load control. Thus this relay delivers reliable and efficient switching through the smallest maintenance requirements when it controls heaters, electrical devices, and lights.
Working
A solid-state relay works on a different principle as compared to EMR relays. So these relays are simply made up of semiconductors that work by separating a low-voltage circuit from a high-voltage circuit using optocouplers. Whenever the control input is provided to the SSR relay, the inside LED will light up and generate a light signal that is obtained by a photosensitive semiconductor. After that, it changes the energy from light into electrical & switches the circuit. So this type of relay works at higher speed with less power consumption.
Pin Configuration:
The pin configuration of the G3MB-202P SSR is shown below. This relay includes three pins which are discussed below.
G3MB-202P Solid State Relay PinOut
- Pin-1 & 2 (Load): These are load pins of SSR.
- Pin-3(+) (5V +ve terminal): It is a control signal pin of SSR.
- Pin-4(-) (Ground): It is a ground pin of an SSR.
Features & Specifications:
The features and specifications of the G3MB-202P SSR include the following.
- It operates from 5V to 24VDC input voltage and it allows easy integration into existing controllers and circuits.
- It supports up to 240VAC output voltages and is perfect for high-voltage load control.
- It handles up to 2Amps of current.
- This module generally comes in PCB mountable packages which make them to use in electronic circuits.
- This relay provides high durability without moving parts.
- It has a compact design which allows simple installation within limited spaces.
- It has a built snubber circuit.
- The control method is Phototriac.
- Isolation voltage is 2500V RMS.
- Maximum turn-on time is 1 ms.
- Its turn-off time is 1/2 cycle of load frequency and a maximum of 1ms
- Its operating temperature ranges from 30 °C to 80°C.
- Its storage temperature ranges from -30°C to 100°C.
- The mounting type is PCB mount.
- The dimensions of this relay are; 25mm x 21mm x 15.5mm.
- Its approximate weight is 12 grams.
- It doesn’t have an LED indicator.
- Dielectric strength is 2500V RMS.
- The insulation resistance minimum is 1000MΩ at 500V DC.
G3MB-202P SSR Equivalent & Alternatives
The equivalent G3MB-202P SSR is G3MC101PDC5. Alternative transistors to G3MB-202P SSR are; LH1500AT, RS PRO 25 A & A03B.
G3MB-202P SSR Driver Circuit for Microcontroller
G3MB-202P SSR driver circuit for microcontroller using a transistor is shown below. So, this relay operation is the same as a normal electromagnetic relay with physical or movable contacts. This circuit uses a photocoupler for isolating input as well as output signals & also switching elements like; triac, thyristor, transistor & diode. The main feature of this circuit is that it does not utilize switching contacts, thus there are no physical wear & tear issues.
The required components to make this circuit mainly include G3MB-202P SSR, two 1N4007 diodes, a 5.6V Zener diode, a 2N2222 transistor, etc. Connect the circuit as per the diagram shown below.
G3MB-202P Solid State Relay Driver Circuit
Working
This circuit is powered with a 5V DC supply and Transistor as well as associated electronic components will make this circuit possible to allow DC control signal from MCUs. Here, the transistor’s collector terminal is simply connected to the input of the relay to sink current from the +ve rail whereas its emitter terminal is directly connected to the GND terminal. Thus, the R3 resistor in the circuit limits the current supply of LED1. For security purposes, a 2A fuse is included. Likewise, D1 & ZD1 diodes will protect the remaining circuit.
Thus, the working of this circuit is, that whenever the input of MCU is high, then 5V and SSR1 get triggered. The load which is connected across the CON3 connector gets turned on. Similarly, when the input of MCU is low, then 0V and SSR1 get turned off & the connected load gets deactivated.
Testing
Once the circuit connections are made, the following steps need to be followed to test the circuit.
- Apply 5Volts DC to power input across CON1.
- Place the digital multimeter into the buzzer or continuity mode & connect the multimeter’s test probes across the switch output of CON3.
- Press on the S1 test switch to obtain sound on the digital multimeter. So if the sound is not listened to; then the circuit will not work.
- Connect AC load toward CON3 so that load can be easily controlled by simply controlling the input of a signal from at CON2 the MCU.
Advantages & Disadvantages
The advantages of the G3MB-202P SSR include the following.
- G3MB-202P SSR can switch 2A loads at 25°C.
- It occupies less space and is perfect for high-density-based PCB applications.
- It switches up to 240vac at 2A current level.
- These relays are opt-isolated for the control circuitry protection.
- This module has a resistive-type fuse to improve safety which protects from too much current draw.
- It has faster switching speeds, reduced electromagnetic interference & longer lifespan.
- These relays can be switched through a much lower voltage and much less current as compared to mechanical relays.
- This relay controls AC loads with Arduino.
- These are in small size, reliable, lower power switching, and silent operation.
The disadvantages of the G3MB-202P SSR include the following.
- These relays cannot be functioned in parallel to improve their current handling ability.
- If its switching current is 10 Amps or above, then its size with a heat sink exceeds a single mechanical relay.
- This relay cost is high.
- This relay produces waste heat throughout ON mode and is relative to voltage drop.
- This relay is bounded by specific voltage or current characteristics.
- There is a fixed voltage drop value on output because of internal impedance. So it is less efficient.
- This relay is insignificant for higher switching voltage processes.
- There is leakage current at the o/p even if this relay is in OFF condition mode.
- It is more susceptible to spikes and surges within the current which is turned on at the output side like the EM relay.
G3MB-202P SSR Applications
The applications of G3MB-202P solid state relay include the following.
- G3MB-202P solid state relay is for multiple circuits controlling.
- Isolating lower voltage from higher voltages
- It is used in electrical appliances to turn ON and OFF applications.
- It is used in smart home devices for silent AC load switching.
- This relay is suitable for equipment and machinery control within industrial settings.
- It is perfect for switching lighting circuits without noise.
- It is used to control heaters and coolers within HVAC systems.
- This relay is used in consumer electronics for controlling reliable AC load.
Please refer to this link for the G3MB-202P Solid State Relay Datasheet.
Thus, this is an overview of the G3MB-202P solid-state relay with up to 100 to 240V AC load handling capacity. This relay module works by using the photo coupling principle. So, these modules are very fast which creates no noise & has a longer lifespan when compared with an electromagnetic relay. Here is a question for you, what is a relay?