SPAJ140C-AA   Overcurrent and earth-fault relay

Three-phase, low-set phase overcurrent unit with definite time or inverse definite minimum time (IDMT) characteristic
Three-phase, high-set phase overcurrent unit with instantaneous or definite time function
Low-set, non-directional earth-fault unit with definite time or inverse definite minimum time (IDMT) characteristic
High-set, non-directional earth-fault unit with instantaneous or definite time function
Built-in breaker failure protection function Two heavy-duty and four light-duty output
relays with field-selectable configuration Extensive data communication capabilities over built-in serial port
Outstanding design flexibility for easy selection of appropriate operation schemes for different applications
Numerical display of setting values, measured
values, memorized fault values, fault codes etc. Enhanced system reliability and availability due
to continuous hardware and software self-supervision with auto-diagnosis Powerful software support for setting and
parametrizing of the relay and for recording of relay parameters with a portable PC.

The combined overcurrent and earth-fault relaySPA] 140 Cis intended to be used for theselective

short-circuit and earth-fault protectionof radial feeders in solidly earthed, resistanceearthed or impedance

earthed power systems.The integrated protection relay includes a phaseovercurrent unit and an earth.fault unit with

fexible tripping and signalling facilities. Theovercurrent and earth-fault relays can also beused inother applications

requiring single-, two-or three-phase overcurrent protection and non-directional earth-fault protection. The

com-bined overcurrent and earth.fault relay also fea-tures circuit breaker failure protection.