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Unelec ACB details

Manish Makwana
Hello,


I'm designing for an upgrade of some very old electrical distribution boxes. These are fed by 1000A Unelec ACBs. I'd like to find out if these have been set to a different trip current, as they are connected to PILC cables of perhaps 185-240mm2. It looks as if these cables can't handle anywhere near 1000A.


From the engraved plate on the side of the breaker, the two types of breakers in use are:

- DVAS UR 7 IN

- PVRT UR 7 IN.


Nothing appears on google for these. Much of the field equipment dates back to the 1960s and 70s, so I'm assuming the breakers are from that era too.


Does anyone know anything about these kinds of breakers, or would know who to talk to? I have emailed Unelec as well, but given their website has not been updated since 2007 I'm not sure what to expect.


Thanks
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  • 0
    Thanks Weeser! That is a great point about the trip coils/contacts perhaps not functioning. I will definitely look into that - we're already talking about putting on a power quality meter to measure the downstream load, to size a replacement breaker and cable. But at that point we're looking at an entire switchboard replacement - this project began as just overhauling some field distribution panels!


    Also, because who doesn't love pics of old switchgear:

    c35016db3df0dd48fd168a07e60291cd-huge-_dsc9675.jpg

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  • 0
    Thanks Weeser! That is a great point about the trip coils/contacts perhaps not functioning. I will definitely look into that - we're already talking about putting on a power quality meter to measure the downstream load, to size a replacement breaker and cable. But at that point we're looking at an entire switchboard replacement - this project began as just overhauling some field distribution panels!


    Also, because who doesn't love pics of old switchgear:

    c35016db3df0dd48fd168a07e60291cd-huge-_dsc9675.jpg

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