8501KU universal plug in relays are designed for multipole switching applications at 300 VAC or lower. These relays are designed to be plugged into a relay socket. This makes for very easy replacement. This relay plugs into an 851NR82 relay socket. This relay has a 3PDT contact arrangements. It has three normally open and three normally closed contacts. The contacts have a 10 ampere rating 277 VAC, a 10 ampere rating at 28 VDC, a 1/3 HP rating at 120 VAC, a 1 HP rating at 277 VAC and a B300 inductive rating. Relays can be ordered with a wide variety of coil voltages. This relay has a 24 VAC nonreplaceable coil. A green LED indicator is not supplied on this relay. 8501KU relays are UL listed with Square D relay sockets, UL component recognized and CSA certified.