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News from NPE's Product Improvement Center: LAF Blown Fuse Lockout


OEM #: 18-392-070-501


Today, we are spotlighting the Allis Chalmers/Siemens Allis Blown Fuse Lockout for the LAF series of low voltage air breakers. This part which has been obsoleted by the OEM often gets bumped and broken when the breaker is moved or worked on.

NPE is the only source where this product is available new. It can be sold as an entire assembly or any of the individual parts shown online




This product and all of the products in the Aftermarket Parts Store can be purchased online or through your normal purchasing channels. As always, our motto "The right part, at the right price, right now!"

Part number used to reference original OEM's for identification purposes only. They are not manufactured, endorsed or warrantied by OEM.

Why Buy NPE's Aftermarket Parts






NPE's aftermarket product line is growing daily with almost 300 individual items shipping daily from our Cleveland facility. We have a wide variety of products, from maintenance tools to replacement parts, so chances are we have just what you need and available when you need it. 

What makes this product line so popular, and more importantly, what makes it so unique?


  • Aftermarket parts are in stock and available for immediate shipment, unlike OEM parts which have lead times of days or weeks.


  • Many aftermarket parts are no longer available "NEW" and are hard to find in the used market.


  • Aftermarkets are not "cheap knockoffs". NPE has had years of experience identifying flaws in original product designs and developing ways to improve them. Many products are considered "one and done" and likely to never have to be replaced again.


  • Orders can be placed online with a credit card or through your normal purchasing channels.


If you are looking for anything from a bearing kit, to plastic molded parts, to a set of racking tools, check out our Aftermarket Parts Store online at If you do not see what you need, send us a photo and a description and it could become the newest addition to the list!

At NPE, our motto is always, "The right part, at the right price, right now!"

Are Westinghouse, Square D and Eaton Cutler Hammer Breakers Compatible?

For Industrial and Commercial Sized Circuit Breakers

Most manufacturing plants, government and commercial facilities rely on electrical equipment that is no longer supported by the OEM. This planned obsolescence requires you to find a reputable source for remanufactured air or vacuum circuit breakers or aftermarket breaker and switchgear parts that match your equipment.

In most instances, breakers that are manufactured by one OEM are not physically compatible to swap out with another but there is one notable exception – the DS line of air circuit breakers.

Eaton Cutler Hammer, Square D, and Westinghouse Breaker Compatibility

Originally, the DS line of air circuit breakers was manufactured by Westinghouse Electric Company. That product line was then sold to Square D and then later to Eaton and Cutler Hammer. Each company changed labels and upgraded trip units to the latest technology of the day, but other than that the products remained interchangeable. This level of continuity can make DS air circuit breakers interchangeable with the right parts.



Of course, that’s just the beginning of the search. Even with compatibility, you will still need to match model numbers, trip units, controls, and accessories to determine which breakers and parts are a viable replacement for your needs. For that, you will need a knowledgeable dealer like NPE to sort through all the variables.

NPE has shelves lined with hundreds of DS circuit breakers and thousands of used and aftermarket parts and we will be happy to find a cost-effective solution to whatever your issue is. Contact us today or go to and let NPE’s online tool guide you through the process and submit your request. 

Old FPE and Westinghouse Parts Compatibility

One of the more interesting aspects of our market is the history of the equipment and how it has changed over the years. While most of those changes were technological, some revolved around the people behind the scenes. One in particular that comes to mind, was a group of design engineers that had left the Westinghouse Corporation and went to Federal Pacific Equipment. While the story has certainly has been passed from mouth to mouth over the years, it does have some evidence to back it up. As told to me it goes like this:


Back in the era of the Westinghouse DB 25 single position circuit breaker, a group of design engineers left the old bar W and went over to FPE. With their designs fresh in their heads, they used much of it to design the old FPE DMB circuit breaker product line. The similarities between the two are obvious. Westinghouse manufactured the DB 25 and the DB 50, etc. FPE’s new product line was called the DMB 25 and the DMB 50, etc. Both of these manufacturers used similar technology and materials for their parts, for example, pole base insulators and arc chutes but the similarities continued to the point that some of the parts are physically interchangeable! In particular, parts like secondary disconnects, control relays, shunt trips and a few others.





    Westinghouse vs. FPE Shunt Trip                                                         Westinghouse vs. FPE Secondary


               If you happen to have this FPE switchgear in your facility and you are having a difficult time locating the parts to maintain it, give us a call at 800-647-0815 or send us an email to  and we will show you parts that are much more common to the market (and less expensive) and how they can be used to keep your equipment up and running for many more years of reliable service.


As we say at NPE- that’s what we’re here for!



News from NPE's Product Improvement Center: LA-1600 and LA-600 Covers


Spotlighting today in NPE’s PIC is our replacement mechanism cover for the problematic blue-faced LA-600 and LA-1600 circuit breakers. As we all know, this molded blue plastic cover is prone to breakage, cracking and/or other failures and it was later replaced by the gold (yellow zinc plated) steel cover in later versions of this breaker line.



                                                                   Cracked/Broken Plastic Faceplate


Our solution? A hand-made steel cover, painted blue and detailed with our house made labels! Guaranteed not to bend or break with normal use, this one and done solution has become very popular. Simply specify what frame size you need and if the breaker is electrically operated or manually operated and we will ship you a new cover within 24 hours. Quantities are limited so large orders may require additional time, but are well worth the wait.


NPE's Allis Chalmers/Siemens Allis LA-1600 and LA-600 Faceplate Cover New Aftermarket Parts List:

*OEM part number 18-657-346-537

*OEM part number 18-657-346-550

*OEM part number 18-657-346-523

*OEM part number 18-657-346-579



*Part numbers used to reference original OEM's for identification purposes only. They are not manufactured, endorsed or warrantied by OEM.



This is just one of the many solutions to day to day issues that NPE can help you with. For more, visit If you still don’t see what you are looking for, give us a call and we’ll try to custom engineer a solution for just for you. We make our aftermarket parts better, stronger and get them to you faster! Our motto is, "The right part, at the right price, right now!"


Watch for NPE’s next spotlight in our Product Improvement Center’s series of blogs.