INTRODUCTION

BE3 ac current relays provide current monitoring and protection in

both single-phase and three-phase systems. They are used in

applications such as motor protection, load detection, and generator

control. Undercurrent, overcurrent, and combined over/undercurrent

units are available. BE3 ac current relays operate when the

adjustable trip point is reached. A time delay control is provided with

an adjustment of 0 to 10 seconds (relay operating time is typically

200 milliseconds). This time delay may be used to prevent false

tripping when there are slight variations in the sensed current.

On overcurrent units, the output relay energizes when the input

signal exceeds the trip point. On undercurrent units, the output relay

de energizes when the input signal goes below the trip point. A red

LED indicates the state of the output relay. A green LED indicates

the condition of the power supply.