Blog posts tagged with 'Allis Chalmers'

News from NPE's Product Improvement Center - 2nd in Series

 

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:

 

https://www.npeinc.com/la-1600-cover-mo

*OEM part number 18-657-346-537

 

https://www.npeinc.com/la-1600-cover-eo

*OEM part number 18-657-346-550

 

https://www.npeinc.com/la-600-cover-mo

*OEM part number 18-657-346-523

 

https://www.npeinc.com/la-600-cover-eo

*OEM part number 18-657-346-579

 

*OEM part numbers are listed for identification purposes only. They are not manufactured by OEM.

 

 

This is just one of the many solutions to day to day issues that NPE can help you with. For more, visit https://www.npeinc.com/aftermarket-parts. 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!

 

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

All About Allis Chalmers LA Breakers

Allis Chalmers produced a very popular line of circuit breakers with model numbers that all started with “LA”. Like other manufacturers’, this product line was produced with various engineering changes and upgrades over the years. In order to ensure that the breaker you order will fit correctly in your application there are some guidelines that you need to follow.

 “LA” original series:  LA-25, -50, - 75 and -100

The 25, 50, 75 and 100 reflect the interrupting capacity of the breakers of 25,000, 50,000, 75,000 and 100,000 amps. The original “LA” series breaker is common in 600, 1600 and 3000 amp frame sizes4000 amp frames are fairly rare. LA-15 (15A), LA-25 (25A)LA 50 (50A) in 225, 600 and 1600 amp frames. They are offered as both manually and electrically operated breakers. Earlier versions of the electrically operated breakers had a solenoid operated mechanism, later versions had a hydraulic mechanism. There was a small production run of LA-50 (50A) breakers that had 12 backstabs in lieu of 6. Care must be taken while retrofitting LA-50 1600 amp breakers. A number of breakers were produced with 3 individual solenoids on each phase that acted as trip units and were driven by current transformers mounted in the cell and then fed to the breaker through a secondary disconnect. If present, the buss mounted current transformers must either be removed or have the secondary terminals shorted out to prevent a fire caused by the open current transformer secondary.

image of Allis Chalmer LA Breaker

LA-75 (75A) and LA-100 (100A) -  these 3000 and 4000 amp frame sizes are commonly supplied as electrically operated but some manually operated breakers exist as well and a few that have both options. The LA-100 was a short production run breaker that is very hard to find. In the 3000 amp vintage, several vintages of internal parts were produced that require experience to identify for proper interchangeability.

"LA" second series: LA-600, LA-1600, LA-3000 and LA-4000:

The second series of “LA” breakers was produced in 600, 1600, 3000 and 4000 amp frame sizes. Their model numbers start with “LA” like their predecessor, but follow the frame sizes LA-600, LA -1600, LA-3000 and LA-4000. This series was offered as both manually operated and electrically operated and included an option for integral fuses to raise the interrupting capacity to 200,000 amps.This option adds an “F” to the end of the model number as in LA-600F, LA-1600F. The 3000 and 4000 amp versions do not have that option.These breakers feature spring charged mechanisms and a closed door draw out design for safety.

The first series, commonly known in the industry as “blue faced breakers” are identified by both the blue-grey plastic faceplates/mechanism covers and also by the fact that they do not have a letter designation (A, B or C) at the end of the model number.

Improvements to the design revolved mostly around parts upgrades, the most noticeable of which are the mechanism covers with the yellow zinc plating which replace the plastic covers that had a history of breaking and earned the nickname of, “gold faced”. The newer vintage also included a new 800 amp frame size, for example the LA-800A. The fused breaker model numbers moved the “F” from the end of the model number to beginning as in LAF-600A, LAF-800B, etc. The most noticeable change in the “B” line-up are the black plastic, non-asbestos arc chutes.

 Image of Allis Chalmers LAF 600 circuit breaker

Interchangeability between the two product lines is limited to the larger frames for example,  LA-75 through LA-3200A are interchangeable. Although the LA-25 and the LA-50 are not, the factory did make a retro-fill breaker for the 600 and 1600 amp frames. However, they did not provide an indication on the nameplate/model number for these retro-fills. The sales team at NPE has that experienced eye for these issues as well as plenty of others.

All of these changes and upgrades and interchangeability issues can be very confusing when you just want to get a breaker or a part to restore or maintain service and keep productions up and running. That’s what we are here for. The NPE team has decades of experience dealing with these issues and will recommend the right part or breaker, at the right price and most importantly have it ready for you right now! Reconditioned breakers, parts, and an increasing line of new and improved aftermarket parts are here to be the solution to your switchgear saga.

Image of Allis Chalmers LA-1600 circuit breakerImage of Allis Chalmers LAF circuit breakerImage of Allis Chalmers LA-20 circuit breaker

So, contact us and we’ll take care of the rest.