This is an isolated single 3.3V relay 10 ampere High-Low Trigger module.
Specifications:
Maximum load: AC 250V/10A, DC 30V/10A
Trigger current: 5Ma
Working voltage: 3.3V
Main components: PC817, JQC3F-05VDC-C
Module size: 50 x 26 x 18.5mm (L x W x H)
Four mounting bolts holes, diameter 3.1mm
The power indicator (green), the relay status indicator (red)
Module interface:
DC+: positive power supply (VCC)
DC-: negative power supply (GND)
IN: can be high- or low-level control relay.
Relay outputs:
NO: normally open relay interface
COM: Common Interface Relays
NC: normally closed relay interface
High- and low-level trigger options:
Low level trigger when jumper connects to LOW pin.
High level trigger when jumper connects to HIGH pin.
WARNING
