Load Tap Changer & Oil Circuit Breaker Components

For over 30 years, National Manufacturing & Distribution has been offering electric utilities and electrical service organizations maintenance parts and components for (LTC’s) load tap changers and (OCB’s) oil circuit breakers. National can offer individual components or maintenance kits which include all of the typical parts and components that are maintained inside circuit tap changer and oil circuit breaker equipment. National was the first to offer this kit service which proved to save utilities on labor and down time when maintaining electrical substation equipment. Please click on the this link: “Maintenance Kits” to be directed to the webpage dedicated to this service.

National has manufactured new and has also refurbished parts for load tap changers including but not limited to:

LTC(Load Tap Changer) Equipment List

ABB: UZD, UZF

Allis-Chalmers: TLF, TLH, TLH-21, TLS

Federal Pacific: TC-25, TC-546

General Electric: LRT-38, LRT-48, LR-59, LR-65, LRT-68, LR-69, LRT-72, LRT-83, LRT-200,

LRT-200-2, LR-300, LR-500M3

McGraw/Pennsylvania Transformer: 396B, 550 Low Recovery, 550 High Recovery, 550B Low Recovery, 550B High Recovery, 550C, 996, V2A, MA, MB

Reinhausen: RMT-1, RMV

Westinghouse: UR, URS, URT, UTH, UT, UTT, UTT-A, UTT-B, UTS, UTS-A, UVT

Others: *Other parts and assemblies are available that may not be listed above.

National has manufactured new and has also refurbished parts for oil circuit breakers including but not limited to:

OCB(Oil Circuit Breaker) Equipment List

Allis-Chalmers: BZO, SDO, OZ

General Electric: FK, FKA, FKD, FKR

Siemens/Allis: FZO

Westinghouse/ABB: 14.4G, 14.4GC, 345G, 345GS, 460GS, B-22-B, B-28-B, GM, GO-2, GO-2B,

GO-3B, GO-4B

Others: *Other parts and assemblies are available that may not be listed above.

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