SPAM150C-AA Motor Protection Relay SPAM-150C

The numerical motor protection relay SPAM 150 C is an integrated design current measuring multifunction relay for the complete protection of a.c. motors. The main area of application covers large or medium-sized three-phase motors in all types of conventional contactor or circuit-breaker controlled motor drives. The motor protection relay is available in two versions, one with a making trip contact and the other with a breaking trip contact.
The relay can also be used for the protection of other objects, such as transformers and feeders, requiring a single-, two- or threephase overcurrent and/or overload protection and non-directional earth-fault protection.

The relay continuously measure the three phase currents and the residual current of the protected object. When a fault occurs, the relay starts and eventually operates, if the fault persists long enough to exceed the set or calculated operate time of the relay.
The motor protection relay consists of a multi-function relay module SPCJ 4D34, an input/output module and an auxiliary supply module housed in a size 100 relay case.
The multi-function relay module comprises seven units, i.e. a three-phase overcurrent unit, a thermal overload unit, start-up supervision unit, a phase unbalance unit, an incorrect phase sequence unit, an undercurrent unit and a non-directional earth-fault unit.

SPAM-150C