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KTU7 Molded Case Circuit Breaker Busbar Alternatives

Question: Why would you use compact bus bar on a KTU7 molded case circuit breaker? What are the alternatives?

Answer: The most common application of KTU7 that requires compact busbar would be in a multiple motor starter control panel used with KTA7. The KTA7 would be used to protect motor loads while KTU7 would be used to protect non-motor loads (transformer or heater). In mixed applications, KT7-32-DB-__ compact busbar will not work with KTU7, but KTU7-D-DB-__ works well with both KTA7 and KTU7. If availability of KTU7 compact busbar becomes an issue then you may want to consider one of the following alternatives.

If the total connected load (current of a group) is not more than 30 Amps, the devices may be daisy chain wired since the line terminals are #10 AWG (good for 30 amps). If there are several KTA7 and only one or two KTU7 then you might consider using a second KT7-32-A3E supply block attached to the KT7 compact busbar to feed just the KTU7 from the compact busbar via wire. If the above suggestions do not apply to the specific application, and KT7-32-DB-__ is NOT an option, then you must consider using a power distribution block.