MQTT PoE I/O Module with 6 Power Relays, 6 Digital Inputs and 2-port Ethernet Switch. WISE-7560M provides 6 wet contact digital input channels and 6 form A electromechanical relays. It features optical isolation for 3000 VDC of transient overvoltage protection and doesn’t have channel-to-channel isolation. Note: When inductive loads are connected to the relays, a large counter electromotive force may occur when the relay actuates because of the e..