Overview
The 1-Channel 5V Solid-State Relay Module is an advanced electronic switching board based on high-quality SSR technology (frequently utilizing the Omron G3MB core). While conventional magnetic relays are limited by mechanical lag and contact arcing, this solid-state module leverages light-based optoisolation to gate AC power.
Because it operates purely on semiconductor logic, it boasts a near-infinite operational lifespan, zero acoustic noise, and microseconds-fast response times. It is universally used by makers to interface low-power microcontrollers like Arduino, ESP32, and PIC with high-voltage mains appliances safely.
Key Features
100% Silent Operation: Completely noiseless switching makes it perfect for indoor automation, media rooms, and desktop projects.
Built-in Fuse Protection: Includes an integrated resistive fuse on the output terminal to safeguard your control circuitry against sudden overcurrent spikes.
Optical Isolation: Complete separation between the sensitive DC control logic side and the high-voltage AC mains side prevents back-EMF damage.
Low Current Trigger: Requires just a tiny 2.5mA signal from a microcontroller GPIO pin to switch heavy AC loads.
Zero-Cross Switching: Smoothly activates the load when the AC voltage waveform passes through zero volts, vastly minimizing radio frequency interference (RFI).
Technical Specifications
| Feature | Specification |
| Input Control Voltage (VCC) | 5V DC (4V to 6V stable) |
| Quiescent Current | 0 mA (When relay is OFF) |
| Operating Current | ~12.5 mA (When relay is ON) |
| Trigger Type | Low-Level Trigger (0 V – 2.5 V activates the relay) |
| Output Load Type | AC Only (Will not switch high-voltage DC loads) |
| Rated Output Capacity | 240V AC 2A Peak (50/60 Hz) |
| Dimensions | Approx. 34mm x 25mm x 22mm |
Interface Pinout Guide
DC Control Side (Input):
DC+: Connect to the +5V power rail of your microcontroller.
DC-: Connect to the common System Ground (GND).
CH1 / IN: Control Signal Input. Pulling this pin LOW ($0\text{V}$) latches the AC circuit shut.
AC Load Side (Output):
Two-way screw terminal acting as an inline inline-switch. Break your AC live wire and run it through these two ports.
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