The Littelfuse Inc. HE3621A0510 relay is a SPST-NO (1 Form A) reed relay with a coil resistance of 500 Ohms and a coil current of 10mA. The relay operates at a coil voltage of 5VDC and has a contact rating of 500mA. The switching voltage of the relay is 200VDC - Max and has a turn-on voltage of 3.75 VDC (Max) and a turn-off voltage of 0.5 VDC (Min). The relay is non-latching and has an operate time and release time of 1ms. The relay is designed to operate in a temperature range of -40°C to 85°C and is commonly used in relays.