Model # THQLLX1

Internet #100674082

Store SKU #599480

GE PowerMark Gold Load Center/Generator Interlock Kit


PowerMark Gold Load Center/Generator Interlock Kit

  • For use with powermark gold load centers
  • Converts load center for use as a generator panel
  • Kit includes interlock device, assembly hardware and labels
$4365 /each
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Frequently Bought Together

Product Overview

There's no need for a separate generator panel with the GE PowerMark Gold Load Center/Generator Interlock Kit. This kit includes everything required to change a 150 - 225 Amp load center to a generator panel. For vertical boxes only.

  • Convert an existing load center into a generator panel
  • For use with a 150 - 225 Amp Powermark gold main breaker load center with a left-right handle orientation and a back-fed branch breaker mounted at top right
  • Ensures that the main breaker is in the off position before the branch breaker is back-fed from the generator for safety
  • UL listed
  • NEC compliant
  • Includes stainless-steel interlock device, auxiliary main breaker retainer, assembly hardware, hole drill template and critical circuit identification labels
  • For information go to and search for publications DET393 (information sheet) and/or DEH-41103 (installation instructions)

Info & Guides

You will need Adobe® Acrobat® Reader to view PDF documents.  Download a free copy from the Adobe Web site.



Product Depth (in.)
Product Height (in.)
Product Width (in.)


Electrical Product Type
Distribution Load Center / Breaker Accessory
Product Weight (lb.)

Warranty / Certifications

Certifications and Listings
1-UL Listed
Manufacturer Warranty
One year after first use.

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Customer Questions & Answers

Will this interlock work on a TM3220CCU load center?

I ordered the part but the box says that it is compatible with TM3220CCU(P). What does the (P) stand for? See picture below... Thanks!
Asked by: Anonymous
I have the same panel, TM3220CCU, it is printed on the interlock box that it is supported, but this is wrong. I can guarantee you that it does NOT work. FYI, I believe the correct part for this panel is THQLLX8FL.
Answered by: Bucky
Date published: 2017-06-11

would this lock work on a cutler hammer 225 amp box

Main breaker, off is to the right when looking at the box
Asked by: rama3953
No, this only works with GE Powermark Gold panels. You would need a Cutler Hammer interlock, designed for you panel.
Answered by: frankft
Date published: 2015-09-20


Asked by: LRP1
you would use any GE 2 pole circuit breaker sized for your generator output up to the max amps the bus is made for.
Answered by: Gunk
Date published: 2015-09-20

Will this inter loc work on a GE TM2420 load center

Asked by: Anonymous
Yes - see attached file
Answered by: Nutmegger
Date published: 2016-09-14
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Customer Reviews

PowerMark Gold Load Center/Generator Interlock Kit is rated 4.3 out of 5 by 52.
Rated 5 out of 5 by from The kit worked well. The instructions and template provide made it easy to drill the holes in the... The kit worked well. The instructions and template provide made it easy to drill the holes in the cover. The kit installed easily within the holes drilled and did the job of making sure the main breakers are off when the power inlet breakers are in the on position. Use care when working within the main load center. Your main wires can still have electricity up to the lugs even if you turn off the main switch within the load center. In my load center the main switch and lugs are on the bottom.
Date published: 2017-04-28
Rated 5 out of 5 by from Everything needed to align & attach an interlock between the... Everything needed to align & attach an interlock between the main the first double breaker. Great if you're not concerned with switching the neutral.
Date published: 2017-03-29
Rated 5 out of 5 by from The Interlock Kit worked as intended - Easy to follow instructions - Easy to install The Interlock Kit worked as intended - Easy to follow instructions - Easy to install
Date published: 2017-02-08
Rated 5 out of 5 by from works like a charm, easy to install. The Interlock kit is far less expensive and easier to install than a transfer switch. Plus, it is much more flexible since it allows selection of any circuit (within reason) in the main panel instead of having to pre-select circuits and wire only those to the xfer switch. The caveat of course is to ensure that the load placed on the generator does not exceed its capacity and the capacity of the generator's main breaker. So careful load analysis, load balancing, and panel labeling should be done prior to any emergency. Also note that the safety protections provided by the Interlock are not in effect when the panel cover is removed.
Date published: 2013-10-11
Rated 5 out of 5 by from Excellent product. This is a great product for those who want to install a generator inlet box on the outside of there home to feed power to your normal GE PowerMark electrical panel during a power outage without the need for a separate generator panel/transfer switch. This locks the main breaker in the "off" position while the breaker for your feed from the generator is in the "on" position, and vice versa. This ensures that you won't have power coming to the panel from 2 different sources. In other words, this is a very inexpensive alternative to the transfer switch/generator panel. This is a nice kit. It seems well built of quality materials. Don't be scared by the hole drilling, the instructions are very clear and the kit comes with a template so you won't mess it up. Unlike the similar kit for Siemens panels, this GE kit does NOT waste any valuable circuit breaker slots. I highly recommend this product.
Date published: 2012-09-02
Rated 5 out of 5 by from Time And Money Saver! When you want to install a hook up for a portable emergency generator, the installer will try to sell you a very expensive ($300+ depending on the number of circuits) sub panel and interlock switch. That's the old way of doing things. It also takes more time to install and that is even more money. Interlocks have been used for years in industry to isolate and control the flow of energy and now makers of home load centers are catching up and creating items like this that install right into your panel and allow you to energize any and perhaps even all of your circuits without the need for a subpanel where you have to pick and choose what to power. The interlock fits over your main breaker and also around a new generator breaker that you install just above it (in the case of this item). It is designed so that both of these cannot be in the "ON" position at the same time and prevents back energizing of lines when the generator is running as well as back feeding of the generator when the main power is restored. Definitely a better, simpler and more elegant approach! My house is mostly natural gas and my 8kW generator can power the whole shebang. But we had 15 circuits for all the rooms installed in our GE Powermark Gold load center. This lets us power the whole house for a fraction of the cost of the transfer switch option. A warning though, a lot of electricians I talked to do not understand these units because they are used to working with old fashioned transfer switches. Some even refused to install it. We found a guy who was knowledgeable and charged right around $500 for the work including all other materials and took 3 hours. Our quotes for transfer switch installs were all over $1000. Definitely worth the couple bucks this cost.
Date published: 2011-01-22
Rated 4 out of 5 by from Effective and affordable compared to other brands of interlocks. Still, expensive for such a smal... Effective and affordable compared to other brands of interlocks. Still, expensive for such a small, simple product. The arms of the interlock had to be bent into a flatter position using a vise and some muscle otherwise the breakers that were supposed to be locked out could be engaged by flipping them under the metal tabs that are intended to block their movement. Installation was simple. The template provided for drilling the holes to mount the interlock on the breaker panel cover was of good quality. The instructions were not clear as to where the washers and lock washers were to be installed. The provided diagram only indicates the use of 2 non-locking washers.
Date published: 2016-10-26
Rated 5 out of 5 by from Great idea Easy to install. Whole lot cheaper than a transfer switch. Do your homework to make sure the lockout kit is compatible to your load center.
Date published: 2012-03-27
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