125A Breaker with tabs

[dapdan]

Midnite,

I recently got some 125A panel mount breakers and they have two tabs between the stud connectors. What are those tabs for?

Cheers...
Damani

[dapdan]

[tecnodave]

Damani,

That looks like a shunt trip breaker,  apply small current to quick connect tabs to trip main breaker.
Do not need to use shunt trip function.

td

[Vic]

Looks like the label says "V    Coil  24 VDC"

You could probably find the exact specs on that breaker by looking at the manufacturer's data for the exact model number on that label.

EDIT:  The Carling Specs that I have for E series PM breakers contradict the label info on Trip Delay.

But it seems that it has the ability to be Coil-Tripped.

FWIW,   Vic

[dapdan]

All,

Label says "V. coil : 24(19 trip) VDC"

For all other like me(that are ignorant to this feature). What application would this feature prove useful or necessary?

Damani

[Vic]

Damani,

Have never used such a breaker ...

But expect that its operation as a circuit breaker should be as you would expect,  and as speced on that label,  regarding trip amps,   delay,  voltage etc.

AND,  it has an added function that you do NOT need to use -- the use of an external voltage of 24 VDC nominal,   applied to those two terminals, that will cause the breaker to Trip.

This function could be used,  perhaps as an emergency off tripping of that breaker to shut off charging of a battery,  or based on a fault detected by an external system,  or perhaps an Emergency Power Off,  as required by some fire fighters,  etc.

The function described above are just my ASSUPTIONS of how such a breaker may work.

YMMV,    Vic

[dapdan]

Thanks Vic. Much appreciated.

Cheers...
Damani

[zoneblue]

This feature sounds useful for emergency disconnects. Especially the new "single" point of disconnect that are increasingly required by code. You could have a swtich, any kind of switch that triggers the breakers for pv, controller and inverter, all at once. The one issue I guess is that such a thing isnt exactly fail safe, in that it requires a power supply to function.

[tecnodave]

To all,

That is exactly what these are used for,  it is often desirable to remotely trip a breaker for shutdown , either manually or more often , automation controls.

td

[Halfcrazy]

This feature sounds useful for emergency disconnects. Especially the new "single" point of disconnect that are increasingly required by code. You could have a swtich, any kind of switch that triggers the breakers for pv, controller and inverter, all at once. The one issue I guess is that such a thing isnt exactly fail safe, in that it requires a power supply to function.

Yes we are starting to bring in a lot of different Remote Trip breakers. They can be tripped by our BirdHouse "Rapid Shutdown system"