Allen-Bradley 810-A03A Inverse Time Relay

The Allen-Bradley 810-A03A Inverse Time Relay is an Open-Type current relay from Allen-Bradley's Bulletin 810 family, Series A, designed for motor and feeder protection in industrial control circuits by applying an inverse-time delay as current rises. It specifies a tripping current adjustment range of 2.1 to 6.1 A and a coil current of 4 A, enabling precise coordination with protective devices in motor circuits and feeders while reflecting the classic Bulletin 810 design used in older Allen-Bradley protection schemes. As part of the 810 family, the 810-A03A provides inverse-time operating characteristics that delay tripping in proportion to overload current, helping to avoid nuisance trips during short surges while still protecting equipment from sustained overcurrent.