LM393 1-Channel Voltage Comparator Module with Relay, DC 24V
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Prices updated: 13 Oct 2026
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About this product
A 1-channel voltage comparator module built around the LM393 comparator chip, with relay output and a channel indicator LED. It compares an input voltage with a reference set by a multi-turn potentiometer and switches the relay when the threshold is crossed. Useful for undervoltage cutoff, level alarms and threshold switching.
Specifications
- Comparator chip
- LM393N
- Channels
- 1
- Supply voltage
- DC 24V (5V and 12V versions also offered)
- Current rating
- 25mA
- Output
- Relay
- Reference adjustment
- Multi-turn potentiometer
- Indicator
- Channel LED
Frequently asked questions
How do I set the trip voltage?
Turn the multi-turn potentiometer to set the reference voltage, then apply the input voltage you want to compare. The relay switches when the input crosses that reference. Measure the reference with a multimeter before connecting a load.
Which version should I choose?
The module is offered in 5V, 12V and 24V versions. Choose the version that matches your supply voltage. The listing describes the 24V version.
