The Schneider Electric LR97D07E is an electronic overcurrent relay from the LR97 family, designed to protect motors against locked rotor, mechanical jamming, phase failure, and overload conditions where current exceeds the setpoint. It mounts directly on a contactor or on a DIN rail inside a control panel. Its tripping threshold is adjustable from 1.2 to 6 A, with a separate thermal protection adjustment range of 1.2 to 7 A — so you set the overload curve independently of the instantaneous trip point. The relay responds to phase failure in under 3 seconds.
The LR97D07E offers three reset modes in one unit: automatic reset with a fixed 120-second delay, electrical reset by interrupting the supply for at least 0.1 seconds, and manual reset. That means you can leave it on auto for an unattended pump house, but still have a manual push-to-reset option when you're standing in front of the panel troubleshooting. Rated insulation voltage (Ui) is 600 V per CSA and UL, and 690 V per IEC 60947-4-1 for the power circuit. The operational voltage (Ue) matches those same limits — so it's rated for 600 V AC systems in North America and 690 V AC in IEC territories. That covers most 480 V and 600 V motor circuits without derating. The relay is IP20 rated, meaning it's touch-safe but not sealed against moisture or dust — standard for inside a control cabinet. It's also TH-treated for humid environments (per IEC 60068), so it handles the condensation you sometimes get in unheated enclosures.