GSR1-25322 Thermal Overload Relay: Comprehensive Guide to Motor Protection in Industrial Automation

The GSR1-25322 is a thermal overload relay set in the 17–25 A range, rated Ue 690 V, with one NC contact (95-96) and one NO contact (97-98) at Ith 5 A. It mounts directly on the bottom of a GSC1-series contactor — the compatible frames GSC1-32, GSC1-25, GSC1-18 and GSC1-09~12 are molded into the housing. The delivery record covers 52 paid units plus 8 free (60 total), received 2026-01-19, 0.5 kg each.

What the nameplate says

The laser-etched marking on the black housing carries the ratings — nothing hidden in a manual:

Certification marks CCC, CE and cULus "LISTED IND. CONT. EQ." appear both on the housing and on the box label.

Controls and auxiliary contacts

Four screw terminals sit along the front edge: 98 and 97 form the NO pair, 95 and 96 the NC pair. The NC contact drops the contactor coil when the thermal element trips; the NO pair is free for an alarm or PLC input. TEST flips the mechanism without any current flowing through the poles — handy for proving the wiring before start-up. STOP does the same trip from the panel, and the blue RESET works in both M and AUTO positions of the selector.

The blue dial on top of the body sets the trip current inside the 17–25 A window; each unit covers a band rather than a single value, so you dial it to the motor's full-load current.

Box label

Condition and delivery facts

Units are new, each in its own poly bag inside the printed carton. The record shows 52 + 8 = 60 pieces on the order received 2026-01-19; the photos here are of one unit unpacked for the shoot, and every unit carries the same sealed packaging. Unit weight 0.5 kg.

Related records

For motor protection on the electronic side, see the LS Electric GMP80-3SR electronic motor protection relay; for the switching half of a starter, the Fuji Electric SC-N2S magnetic contactor record shows the contactor this relay class typically bolts onto.