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208V 3 phase (3 hots and 1 neutral) power supply contactor wiring

bobdxcool

Mar 9, 2012
98
Joined
Mar 9, 2012
Messages
98
Hi

I am looking to wire a contactor to a 208V 3 phase supply. The contactor coils are rated for 208V. In order for the contactor to work, should I connect one end of the contactor coil to neutral and other end to one of the lines ??

Or, should I connect the 3 lines in parallel (as each line has only 120V) and connect the output to one end of the coil and the other to neutral ??

the contactor works properly only when it gets 208 across its terminals
 

Laplace

Apr 4, 2010
1,252
Joined
Apr 4, 2010
Messages
1,252
Do the contactor installation instructions look anything like the attached image?

http://www.allaboutcircuits.com/vol_4/chpt_5/2.html

contactor-png.13598
 

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ramussons

Jun 10, 2014
449
Joined
Jun 10, 2014
Messages
449
Hi

I am looking to wire a contactor to a 208V 3 phase supply. The contactor coils are rated for 208V. In order for the contactor to work, should I connect one end of the contactor coil to neutral and other end to one of the lines ?? ... the contactor works properly only when it gets 208 across its terminals


The contactor coil needs to be connected between 2 phases, not between Phase and Nuetral.

Or, should I connect the 3 lines in parallel (as each line has only 120V) and connect the output to one end of the coil and the other to neutral ??


DON'T DO THIS. The luckiest you can get doing this are blown fuses. Or you will end up with sparks / fire / burns ......

Ramesh
 
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