The NBC NB902-5S-S-A 40A with Relays General Purpose Non Latching 5VDC SPST 40A is an industrial-grade relay designed for use in a wide range of applications, including industrial automation, automotive, security, HVAC, and other applications managed with control systems. This NB902-5S-S-A 40A with Relays General Purpose Non Latching relay has a 5 VDC power source, and features SPST (single pole, single throw) contacts, with a maximum rating of 277 VAC and 30 VDC. It is designed to be RoHS (Restriction Of Hazardous Substances) compliant, and can be mounted through the circuit board non-soldering holes. This relay is designed for rapid switching of AC and DC circuits, and can handle up to 40A current.