Allis-Chalmers TLH-21 Reversing Moving Contact Assembly
A precision replacement reversing moving contact for Allis-Chalmers TLH-21 load tap changers (LTCs), machined to OEM dimensional specifications.
- OEMAllis-Chalmers
- OEM part no. (TLH-21)8072
- OEM part no. (TLH-20)7074
- Model / SeriesTLH-21
- Part typeReversing moving contact
- EquipmentLoad tap changers (LTCs)
- AvailabilityBuilt to order / lead time confirmed at quote
- Internal ref.LTCACTL302
Overview
Reversing moving contact assembly for the Allis-Chalmers TLH-21 LTC. Six per complete kit.
About the Allis-Chalmers TLH-21
The Allis-Chalmers TLH-21 is a later-generation reactor-type load tap changer with an isolated reversing switch design that separates the reversing switch contacts from the main switching path, reducing reversing contact wear compared to earlier TL-series designs. The main moving and stationary contacts still require periodic inspection and replacement at the manufacturer's recommended interval. The TLH-21 is found in utility distribution and transmission transformers and is fully supported by Southern Switch with new contacts, complete kits, and hardware including the collector hub, collector ring, and reversing switch assembly.
Why replace worn LTC contacts
Worn or burned tap-changer contacts raise resistance, run hot, and can lead to tap-changer failure. Precision replacements restore reliable switching and extend the service life of the LTC.
Stock, lead time & reverse engineering
Lead time is confirmed at quote; discontinued or hard-to-find parts are reverse-engineered from a sample, a drawing, or a model number. Based in Palm Harbor, FL, Southern Switch & Contacts manufactures and ships replacement parts to utilities nationwide, and has served the industry since 1982.
Worn but not scrap? Send us your used contacts. We recondition them to OEM dimension, or machine a new set from your sample, and return them tested and documented. Often cheaper and faster than buying new.
Send the model number, asset tag, or just a description, we’ll reply with pricing and lead time within one business day.
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