Electrical Power & Protection


Compact motor starter with protection

March 2019 Electrical Power & Protection

The new motor starter Christian P-4.0 from Tele is designed for motors up to 4 kW @ 400 V, and includes five functions in one compact unit, requiring only 22,5 mm width. This intelligent instrument offers a soft-start, soft-stop, forward/reverse, overload protection and an integrated three-phase motor contactor.

Offering integrated motor protection, the starter makes the use of an external MCB obsolete. A simple circuit breaker protects the installation against short circuit and faulty wiring. The ­soft-start and stop function is performed by reliable semiconductors (thyristors) and the reversing function by an internal relay. After performing the start process, the semiconductors are bypassed by integrated relays to minimise power dissipation. The intelligent combination of semiconductors and relays increases the lifetime and efficiency of the unit significantly. The overall combination of the above-mentioned features protects motors, shafts, and industrial plants from mechanical stress and reduces maintenance and standstill times. Other benefits include:

• Increased system availability through the motor protection function.

• Increased lifetime through hybrid design, compared to traditional contactor-relay solutions.

• Robust semiconductors with 1500 V isolation voltage.

• Energy saving by bumpless soft-start/stop function.


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