ITE breaker rating

[kjjack]

Can anyone tell me where to find interrupt rating data for ITE 5kv HK model breakers?

 

[dpc]

From my EasyPower library data, there are three versions of HK breakers at 5 kV:

5-HK-75 (75 MVA)
5-HK-250(250 MVA)
5-HK-350(350 MVA)

If you can let me know what class you have, I can post the detailed ratings.

 

[kjjack]

Thanks for the quick response. I've got both 5-HK-250 and 5-HK-350 class breakers.

 

[dpc]

Hope this helps - I am basing this on our analysis software standard library data and I have not verified against any original ITE data, but I believe this data to be correct. Usual disclaimers apply. If anything doesn't look right, let me know.

Test Basis for both is ANSI-Symmetrical current basis.


5-AK-250:

MVA = 250 MVA
Nom kV = 4.16 kV
Max kV = 4.76 kV
K Fact = 1.24
Close & Latch = 58 kA
Interrupting Amps at Max kV = 30.3 kA
Max Interrupting Amps = 51 kA
Interrupting Time = 5 Cycles

5-AK-350:

MVA = 350 MVA
Nom kV = 4.16 kV
Max kV = 4.76 kV
K Fact = 1.2
Close & Latch = 78 kA
Interrupting Amps at Max kV = 42.5 kA
Max Interrupting Amps = 37.5 kA
Interrupting Time = 5 Cycles