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Anonymous Poster

Contactor Rating AC3 and AC1

11/24/2010 4:14 AM

How can one know whether a contactor rating of 630A AC3 can be used for 800A AC1?
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kvsridhar
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#1

Re: Contactor Rating AC3 and AC1

11/24/2010 8:00 AM

All ratings will be available in the manufacturer's catalogue, if not on the nameplate. Don't you have that with you ? There is no formula for finding equivalent ratings across utilisation categories.

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SHAMITHGAMBHIR1
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#2

Re: Contactor Rating AC3 and AC1

11/25/2010 6:03 AM

IEC Categories for Current rating of the contactor are described as:

AC1 - Non-inductive or slightly inductive rows

AC2 - Starting of slip-ring motors

AC3 - Starting of squirrel-cage motors and switching off only after the motor is up to speed. (Make Locked Rotor Amps (LRA), Break Full Load Amps (FLA))

AC4 - Starting of squirrel-cage motors with inching and plugging duty. Rapid Start/Stop. (Make and Break LRA).................

and ofcourse it s given in the catalogue ............

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