This FAQ has been written for NEAL (North East Africa and Levant) region. If you are looking for information for another region, please select the correct country from the top-left dropdown in the page and 'Navigate to Browse FAQs' in the Support menu.
Category DC-1: This category applies to all types of d.c. load with a time constant (L/R) of less than or equal to 1 ms
Category DC-3: This category applies to starting, counter-current braking and inching of shunt motors.
Time constant less or equal 2 ms.
On closing, the contactor makes the starting current, which is about 2.5 times the rated motor current.
On opening, the contactor must be able to break 2.5 times the starting current at a voltage which is less than or equal to the mains voltage. The slower the motor speed, and therefore the lower its back e.m.f., the higher this voltage. Breaking is difficult.
Released for: Schneider Electric Egypt and North East Africa
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