Motor circuit breaker
0.4 - 25 A | MPTx4 Sentera Thracia

For transformer controlled three-phase motors, total motor protection is only possible through direct monitoring of the working conditions: current and temperature. Our three-phase motor protection devices for transformer controllers MPTS4 and MPTT4 offer optimal protection for motors and other loads up to 25 A, due to its high breaking capacity with strongly limited current.

They are equiped with isolating and main switch functions for transformers with high inrush currents (MPTS4), due to overload and short circuit tripping, and additional thermal contact analysis (MPTT4). They are standard fitted with one out of five possible combinations of auxiliary contacts for remote signalling, electrical interlocking and control applications. Ten ranges are covering nominal rated currents from 0.4 up to 25 A. The motor protection units are self-protected up to 6.3 A at 400 V. Ranges >6.3 A provide a short circuit withstand rating of 6 kA. The MPTS4 range is temperature compensated and the actuating current of the short circuit trip is 20 x Iu.