4 Channel Solid State Relay
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4 Channel Solid State Relay 4-Channel Solid-State Relay is somewhat similar to that of a mechanical relay & the difference is that there is no moving contact in a Solid-State Relay. Here we make use of a Phototrriac coupler to turn it ON and OFF. It finds its application in AC circuits as a TRIAC has got only limited applications in DC. This module is ideally suited to controlling larger voltages with the project. This is a 4 channel relay module that can be used to activate up to 240V AC. This allows you to build in device control, operating lighting, or triggering systems when the module is triggered. With the labeled screw terminals it's easy to connect. Solid State Relay - Solid State Relay (SSR) has advantages such as more efficient switching speeds, more stable operation against electrical noise, longer service life, resistance to physical vibrations and resistance to moisture, which distinguish this type of relay from ordinary mechanical relays. These relays are preferred in places that require fast and precise operation such as computer peripherals, medical devices. Solid-state relays do have several advantages over mechanical relays. One such advantage is that they can be switched by a much lower voltage and at a much lower current than most mechanical relays. Also, because there are no moving contacts, solid-state relays can be switched much faster and for much longer periods without wearing out. This is a quad-channel relay module which can be used to activate up to four separate 240V AC. This allows you to build in device control, operating remote lights or triggering systems when the module is supplied the signal.The screw terminals are well labeled and definition of the units function is shown underneath. Also, read our blog on What is a Relay detailing how it works, relay contact types, and different types of relays and their application. Applications: Control outputs from programmable controllers and positioning controllers Office Automation, Home Automation
- 4 independent channels for controlling multiple AC loads
- Supports up to 240V AC and 2A per channel (with heatsink)
- Optically isolated inputs for safe microcontroller interfacing
- No moving parts — silent, vibration-resistant, long lifespan
- Compatible with Arduino, Raspberry Pi, ESP32, and 3.3V/5V logic
- Clearly labeled screw terminals for easy wiring
- Solid-state design for silent and reliable operation
- High electrical noise immunity
- Long operational life (>100,000 cycles)
- Fast switching speed compared to mechanical relays
- Compact PCB design with labeled terminals
- Suitable for industrial and consumer automation
| Rated output load | 100V ~ 240V AC |
|---|---|
| Rated input voltage | 5V |
| Dimensions (mm) | 55 x 57 x 22 (L x B x H) |
| Weight | 5 grams |
Can this 4-channel SSR be used with Arduino?
Yes, it is compatible with Arduino, Raspberry Pi, and other 3.3V/5V microcontrollers via digital output pins.
What is the maximum voltage and current rating?
Each channel supports up to 240V AC; load current depends on heatsinking—typically up to 2A per channel continuous.
Is a heatsink required for operation?
Recommended for loads above 1A or continuous use to prevent overheating and ensure long-term reliability.
How does it differ from a mechanical relay?
SSR has no moving parts, offers faster switching, silent operation, longer life, and better resistance to vibration and noise.
What are typical applications for this SSR module?
Used in home automation, industrial control systems, lighting control, HVAC, and PLC output modules requiring silent and reliable AC switching.
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About 4 Channel Solid State Relay by Iotcart
Shop 4-Channel Solid State Relay for Arduino & Raspberry Pi. Controls up to 240V AC, 2A per channel. Silent, fast switching. Buy now in India.
Categorised under: Relays› Motors & Mechanical› Solid State Relays