JRS2 series bimetallic strip thermal overload relay is mainly applicable to circuit of AC 50/60Hz, with rated working voltage up to 690V and current from 0.1A to 630A. It is used to protect a motor from overload, phase-failure, extra-long starting time and blocking time. It can be inserted in a corresponding AC contactor or installed independently. It can replace JRS1 series thermal over-load relays.