This is a solid state relay (SSR) Unit from M5Stack. An SSR works the same as a standard (mechanical) relay. However, an SSR can be turned on and off much more often because it does not experience mechanical wear. Another important difference is that this relay can only switch alternating current.
Specifications:
Signal voltage: 3.3 - 5V
Signal current (with 5V): ~5mA
Relay:
Maximum switching voltage: 250V AC*
Maximum switching current: 2A
Number of channels: 1
Control: High-active (relay switches on at a high signal voltage and off at a low signal voltage)
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