contactor help!!

[jetboy]

i have finish wiring my oven and cycled it on and off a few times, today i decided i was going to bring it up to 200 degrees and at about 180 the contactors blew. i have 6000w on each 40 amp contactors. what could of gone wrong.
here is a pic of my box

[jetboy]

after reading another post i think the contactor was bad it was buzzing pretty load and i didnt know that are not supposed to do that. but now that on the right contactor blew i cant seem to get the left on to work. i guess it may have blown also.

[Brintiff]

What do you mean by they blew? The contactor opened and the coil will no longer pull it in? I don't know what type of contactor you are using but judging from the picture they look small for a 40 amp contactor, I use contactors just about daily at work as an electrician, control wiring is my specialty.

Do you have a way to measure ohm's? That will tell us if the coils are toasted. Zero resistance across the coil terminals is going to mean toasted coils.

[jetboy]

i know the one on the right is toast cause it popped and smoked alittle. the contactors are cutler-hammer c25bnf240a 40amp 120vac coil. the left on has 137.5 ohm's across the coil and the right one has none. but both show 120v on both side of coil when pid is on and no power to the elements.

[baz]

i am no electrician but i can tell you i have a 50 amp square D contactor and it is at least 2 to 3 times the size of your contactors ,

[jetboy]

ok i figured it out i wired it for 240coil, the wiring diagram i had was labeled wrong. looks like some new contactors for me. thanks for your help guys

[Brintiff]

The relays were marked 240v coils but the coils were 120v? If that's the case whomever supplied them owes you two contactors, the question is how do you know they are supposed to be wired 120v?

Or did you screw up?

A little late but ALWAYS check and double check voltages and your connections. I've been doing this stuff for 15+ years, every once in awhile I'll double check and find I screwed up, it happens.

[jetboy]

i pulled a wiring diagram off here that was labeled 120 but was really 240. honest mistake i just followed the diagram without double checking.