Allen-Bradley 809-A12E Instantaneous Trip Current Relay

Allen-Bradley Bulletin 809-A12E is a magnetically operated instantaneous-trip current relay used in AC and DC protection schemes to trip a connected contactor when the monitored current exceeds a preset level, protecting motors, feeders, and control circuits. The A12E variant specifies an adjustable tripping current range from 38 to 108 A, enabling precise protection for mid- to high-current loads. It is listed for line voltages in the 120–600 VAC range and is commonly documented with a coil/current rating around 56 A, a combination often referenced in distributor catalogs for this model. Although the 809-A12E has been discontinued by the manufacturer, it remains available through third-party distributors and legacy inventories.