A class 1 contactor should be mechanically sound to withstand

A class 1 contactor should be mechanically sound to withstand

Right Answer is:

0.025 million times

SOLUTION

Mechanical endurance:-  1 million no-load operating cycles. This represents the number of no-load operating cycles which can be made before it becomes necessary to service or replace any parts other than contacts.

Duty Class 1:-  For use in systems where the power factor of short-circuit current is extremely low, e.g., where the switchgear is connected in relatively close proximity to the source of generation. Duty Class 1 is the normal or medium requirement contactors.

For MV contractors such minimum requirements might be specified as:

  1. Mechanical endurance (i.e. off-load) 25,000 operating, cycles or 0.025 million times
  2. Electrical endurance (i.e. on load) 5,000 operating.
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