
1 Channel 5V Solid State Relay SSR Module (Active Low)
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Prices updated: 12 Oct 2026
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About this product
A single-channel solid state relay module with a 5V control input and an active-low trigger. It uses an infrared LED and a phototriac for optical isolation, so a low-voltage DC control circuit can switch AC loads with no moving contacts. Useful for switching lamps, heaters and other AC loads from a microcontroller output.
Specifications
- Channels
- 1
- Control voltage
- 5 V
- Trigger logic
- Active low
- Relay type
- Solid state (SSR), optically isolated
- Load type
- AC loads
Frequently asked questions
What does active low mean?
The relay switches on when the control input is pulled LOW and switches off when it is HIGH.
How do I choose a suitable load?
The listing does not state the load voltage and current rating. Check the markings on the module or its datasheet, and add a heatsink for heavier loads.




