Relay boards datasheet
Each relay has two changeover contacts, and an LED indicator to show when the coil is energised. The coils of the relays are common to the positive supply and the relays can be operated individually by switching a negative to the numbered coil inputs.
The contacts are suitable for switching a maximum of 30V DC and 2 Amps. The current consumption of the unit when operated from a 24V supply is approximately 25mA per relay.
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