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1. The module uses quality relay normally open interface Maximum load: AC 250V/10A, DC 30V/10A;2. Adopt SMD optocoupler isolation, strong driving ability and stable performance; trigger current 5mA;3. The working voltage of the module is 5V; The module can be set to trigger high or low by jumper;4. Fault-tolerant design, even if the control line is broken, the relay will not operate;5. Power indicator (green), relay status indicator (red). Humanized interface design, all interfaces can be directly connected to terminal leads, which is very convenientModule interface:1.DC+: Positive power supply (VCC)2.DC-: Negative power supply (GND)Relay output:1.NO: relay normally open interface2.COM: Common Interface Relay3.NC: relay normally closed interfaceHigh and low level trigger options:It is low-level triggered when the jumper is connected to the low pinIt is HIGH triggered when the jumper is connected to the HIGH pinsize: 50mm x 26mm x 18.5mmMaterial: PCB, metalcolour: red+bluePackage Contents:10 x Relay moduleOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.