Shunt trip breakers for equip. under kitchen hood

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faresos

Senior Member
Hello every one:

I have a question regarding shunt trip breakers for equipments under commercial kitchen hood; We have many shunt trip breakers in one panel and I'm not sure what does activate these shunt trips breaker, is it a signal from Ansul system control panel or the signal should come from the fire Alarm control panel?

Thanks,
Sam
 
faresos said:
Hello every one:

I have a question regarding shunt trip breakers for equipments under commercial kitchen hood; We have many shunt trip breakers in one panel and I'm not sure what does activate these shunt trips breaker, is it a signal from Ansul system control panel or the signal should come from the fire Alarm control panel?

Thanks,
Sam
Click to expand...

It should be from the Ansul system micro switch however, it may need to go through a relay first depending on the number of functions that are being controlled from the switch.

Roger
 
faresos said:
I'm not sure what does activate these shunt trips breaker, is it a signal from Ansul system control panel or the signal should come from the fire Alarm control panel?
Click to expand...
Simply, it's a tripping voltage from a NO terminal on a microswitch that had power on its common terminal.

Make sure the shunt-trips can withstand constant energization if the tripping voltage remains after the trip occurs.
 
iwire said:
They can, you just had some bad luck.
Click to expand...
I have, but some ST breakers come with warnings that the coil should not be continuously energized.

To assure this doesn't happen, have the voltage supplied by a ST breaker itself, or use aux. contacts.
 
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