Relay board x4 5V opto isolated

Simple relay board with four single-pole double-throw relays. The inputs are protected with opto couplers LEDs indicate relay status. The relay is active when the input is pulled high. The relay has an SPDT contact with connections for normally open (NO), common (COM) and normally closed (NC).

* Supply voltage: 5VDC
* Relay contact: 10A 250VAC
* Dimensions: 55 x 78 x 20mm
* Mounting holes: ø3.5mm