Square D PH MCCB Instantaneous Trip

[wbd]

Hello,

I have a Square D PH MCCB (1200A)and can not locate what the instantaneous trip value is. Typically on most breakers it would be a dial(s) located on the front of the breaker. There is nothing on the front. The manual discusses installing trip columns (rating plugs) and the TCC shows a range of instantaneous trip.
Does anyone have any experience with this breaker and can point me to where the instantaneous trip setting is located? Is it behind the plate that is removed to install trip columns?

Thank you in advance for reading/replying.

 

[unclebob]

It's quite possible the instantaneous is fixed at some value between 8 X and 15 X the nominal current rating . It's readily accessible on the front of the breakers, if adjustable.

Bob

 

[ScottyUK]

Is it definitely a breaker and not a moulded case switch, i.e. an MCCB without a tripping unit?

 

[wbd]

Yes it is an MCCB SQD PHF2036, 2000A frame with 1200A trip. This is the main breaker for a 480V service.

 

[VTer]

Typically these CBs have a inst. dial setting behind the cover and below the plug ratings that slides from left to right between LO and HI settings. I am not sure about this specific CB and it's hard to make out from the picture, but what is showing below the center pole trip plug on the frame of the CB that would be sitting behind the cover?

"Throughout space there is energy. Is this energy static or kinetic! If static our hopes are in vain; if kinetic — and this we know it is, for certain — then it is a mere question of time when men will succeed in attaching their machinery to the very wheelwork of nature". – Nikola Tesla

 

[VTer]

I just found an old picture. It should be below the center pole trip plug as I suspected. Take a look at the attached photo.

"Throughout space there is energy. Is this energy static or kinetic! If static our hopes are in vain; if kinetic — and this we know it is, for certain — then it is a mere question of time when men will succeed in attaching their machinery to the very wheelwork of nature". – Nikola Tesla

 

[wbd]

Perfect! I knew someone on this site would have an answer! Many thanks as I am unable to go to the job site and see for myself!

 

[wbd]

VTer, just noticed your name. Just curious if you are in Vermont? I am.