The R-20E is a multi-voltage relay with terminal strip field wiring connections, mounting track and hardware mounted in a steel enclosure. The closure has a removable front cover that provides easy access and a LED viewing hole on the top of the cover. The R-20E is a single 2 Form C (DPDT) relay with a red LED . Also known as -System Sensor By Honeywell-Us LIKE THE R-20T, BUT W/ A STEEL E - BK-R20E