Pistol grip
Pistol grip
(OP)
I am installing some vacuum switchgear, and there is a little mix up in the pistol grip for the main breaker. We ordered the same grip as used in a previous job, which in the database said it had an interrupting current of 5A. However, when it got here it actually was only good for 3A. The VCB has a trip coil with a continuous current rating of 3A.
Is it alright to use a switch whos interrupting rating is equal to the continous trip coil rating? I usually buy a size up...
If not.. is it standard practice to use an interposing relay in the main trip circuit? Seems to me this would just be another piece of equipment that could malfunction between me and the trip coil?
Is it alright to use a switch whos interrupting rating is equal to the continous trip coil rating? I usually buy a size up...
If not.. is it standard practice to use an interposing relay in the main trip circuit? Seems to me this would just be another piece of equipment that could malfunction between me and the trip coil?






RE: Pistol grip
RE: Pistol grip
Come again? I don't know if were on the same page??
What I am talking about is tripping the breaker? Not the mains?
As per the manufactures drawings, my pistol grip will feed directly the trip coil of the breaker. This is the rating I am wondering about...
RE: Pistol grip
RE: Pistol grip
RE: Pistol grip
Thanks Stevenal and BEPC13...it is clear now...
Stevenal, I was not being crass, I merely did not understand. However, Reading the post back it looks like that even to me...
Thanks again...
Regards,
Tulum
RE: Pistol grip
To achieve certain DC-interrupting ratings with control switches, up to four series contacts on the switch assembly may be required. For example, see rating charts in www.geindustrial.com/products/brochures/sb1.pdf
RE: Pistol grip
RE: Pistol grip
It states in the original post that the contact current ratings were 3A. The voltage rating is 125vdc, but was not a concern for this question so was not mentioned.
I don't know these people, and I have never had contact with them outside this forum.
RE: Pistol grip