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Shunt trip breakers #68803
08/16/06 08:39 PM
08/16/06 08:39 PM
Peter  Offline OP
Joined: Jun 2004
Posts: 92
San Diego
I was hooking up an Ansul system today with a shunt trip breaker. I connected the shunt trip to the normally closed contacts from the Ansul system. It seems that every time I turn on the breaker for the Ansul system, both of the pizza oven breakers trip. Should I attach to the normally open contacts?
Should I wire the two pizza ovens in parallel or series?

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Re: Shunt trip breakers #68804
08/16/06 09:55 PM
08/16/06 09:55 PM
togol  Offline
Joined: Sep 2005
Posts: 421
around here, once the Ansul ring is pulled,
EVERYTHING electrical on
the cooking line must be de-energized,

the gas valve must close ,

the MUA for the hood is shut down,

and the hood exhaust fans shall continue to run....

is the Ansul system cocked ? it sounds like it is tripped and needs to be reset.

unwire the ansul switch and reset the shunt breaker , that should tell you

pizza ovens in parallel or series???

Re: Shunt trip breakers #68805
08/16/06 11:22 PM
08/16/06 11:22 PM
Peter  Offline OP
Joined: Jun 2004
Posts: 92
San Diego
The Ansul system is cocked.
What I mean by series/paeallel is there are two, three pole breakers, each with its' own shunt trip mechanism [takes up on breaker space]. I wired these in series instead of parallel.
What I need to know is what trips the shunt trip? Is it the presence of voltage or the absence?

Re: Shunt trip breakers #68806
08/17/06 06:14 AM
08/17/06 06:14 AM
Roger  Offline
Joined: May 2002
Posts: 1,716
The shunt trips work upon applied voltage.

You will need to wire two breakers in parallel.

One side of the shunt coils will wire to a neutral or neutral bar, (this is assuming 120 v shunt trip units) the other sides get the voltage through the Ansul switch. You will feed the Ansul common with 120 v and wire your switch leg to the open switch conductor when the Ansul system is cocked.


[This message has been edited by Roger (edited 08-17-2006).]

Re: Shunt trip breakers #68807
08/17/06 08:56 PM
08/17/06 08:56 PM
Larry Fine  Offline
Joined: Feb 2005
Posts: 693
Richmond, VA
Just an aside: For anyone who needs it, I came up with a way to interconnect the intake and exhaust fans to the control box using only 3 wires.

There are two advantages: (1) freeing up the second micro-switch for use with shunt-trips or other purposes; (2) being able to use simpler wiring methods (MC, etc. as required).

It can easily interface with existing wiring. Of course, anything other than 120v motors will need relays/contactors to use this method.


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Larry Fine
Fine Electric Co.
Re: Shunt trip breakers #68808
08/18/06 11:20 AM
08/18/06 11:20 AM
XtheEdgeX  Offline
Joined: Apr 2005
Posts: 116
Normally Open

Re: Shunt trip breakers #68809
08/18/06 09:47 PM
08/18/06 09:47 PM
Peter  Offline OP
Joined: Jun 2004
Posts: 92
San Diego
Today I changed from serial to parallel. This seems to make sense. I had already changed from the N.C. contacts to the N.O. contacts.
Thank you for your adviCe.


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