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#20954 - 01/24/03 04:26 PM AC disconnect switch for DC motor?
Sandro Offline

Registered: 12/30/01
Posts: 449
Loc: Stoney Creek, ON, Canada
We are doing work at a factory here with all DC motors for the conveyor systems. The gentleman wants each of the 7 DC motors to have disconnects at the motor (3/4 hp DC motors).

No switch in the Leviton book is rated for DC. Is it permissible to use AC motor control switches for DC? Nothing on the Leviton website or in their product catalog says anything about DC switches.

Switch in question is the Manual Motor Start toggle switch.(Leviton MS402)

Cat. # General Purpose Rating Max. H.P. Rating Description
30AMP AC Manual Motor Starting Switches
MS302 30 AMP 600 V AC 2HP 120 V AC
5HP 240 V AC
10HP 480 V AC
15HP 600 V AC Double-pole, single-throw, AC manual motor starting switch, without overload protection

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#20955 - 01/24/03 05:42 PM Re: AC disconnect switch for DC motor?
lighthouse Offline

Registered: 01/02/03
Posts: 141
Loc: philadelphia pa 19125
Sandro...square d has what i think your looking for.just check your grainger catalog or go to there web site.the one i see in the book is 3/4 hp,2pole,110-230 volts

#20956 - 01/25/03 12:54 AM Re: AC disconnect switch for DC motor?
amandaamisha Offline

Registered: 12/09/02
Posts: 16
Loc: safat,kuwait,kuwait
Dear Sandro,
You know as per IEC standards AC-22 duty is for switching resitive and inductive loads .Now in DC we don't have inductance hence AC-21 duty switches should work.Check out websites of SOCOMEC,MEM,CUTLER HAMMER.


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