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Old 11-08-2013, 11:34 AM   #1
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Dean E's Avatar
1989 32' Land Yacht
Oakton , Virginia
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Retainer for Back-fed Branch Breaker used as Main

Hello all.

I am installing a new load center with increased space for circuit breakers. This is because I have installed a new water heater with 120 volt and propane options. I need a new breaker for the water heater, but the present panel on this particular vintage, non-AS, travel trailer, does not have enough breaker spaces.

I am using a back-fed, single pole, 30 amp breaker as the main breaker.

I have read that a back-fed breaker, when used as a main, needs a retainer to prevent removal. I cannot imagine attempting to remove that 30-amp breaker under any circumstances. (However, on some residential panels, the mains are designed to be pulled out of the panel.)

The retainer part number is THQPSBK, and the description is Travel Trailer Main Breaker Kit for THQP breakers.

This retainer is not available at the big box stores (but might be available on line--if in stock), and I cannot find an illustration or photo anywhere on line. A few online electrical retailers list the retainer, which may cost about 15-20 dollars after shipping.

I think I can get by without the retainer temporarily (or permanently), but I would appreciate hearing from those with more experience.

I enjoy the wonderful, usually clear and correct, information on these forums.

I am a machinist--not an electrician.

Thank you!
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Old 11-08-2013, 12:28 PM   #2
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Here you go.
Jim N5TJZ Air# 174
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Old 11-08-2013, 12:59 PM   #3
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Dean E's Avatar
1989 32' Land Yacht
Oakton , Virginia
Join Date: Jul 2013
Posts: 44
Images: 5
Thanks Jim.

I saw that picture but could not see where it would fit.

I just located two tiny parts that act as retainers. They were in a small plastic baggie in the factory box. They have no part numbers.

There is one push nut and one square washer that fit on either one of a pair of upright plastic (.236 inch diameter) posts molded into the breaker assembly. The plastic posts are located for using either a single-pole or double-pole breaker.

I'm glad I procrastinated and didn't order the listed part number.

Dean E
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