Solutions   for   Protecting   andManaging   the   Electrical   Network

GTM   7111

Synchronous motor out-of-step protection relay

The GTM 7111 is a power relay, designed specifically to protect synchronous motors against out-of-step (or loss of synchronism) conditions which may result from sudden overloads, a drop of network voltage, or a drop in excitation (or field) current.
The GTM is supplied in type R2 plug-in modular case which may be mounted either as a separate relay, flush or projecting mounting, or as an element in a standard 19" rack croudle.


  • Out of step [78]


  • Nominal current: 1 or 5 A
  • Nominal frequency: 50 or 60 Hz
  • Nominal voltage: 100 or 110 V
  • Setting range: 20-80% Sn
  • Tripping time: 0.1-0.5 sec.
  • Output unit with 2 contacts (NA or NC)
  • Hand reset mechanical operation indicator


  Device Doc. Type Lang. Ref. Index
GTM 7111 Leaflet EN / FR -- --
GTM 7111 User Manual IT M.1742 B
GTM 7111 Connection/Definition Diagram -- 9774 A