McGraw-Edison 550-BLS Reversing Stationary Neutral Contact
A precision replacement neutral contact for McGraw-Edison 550-BLS (550B) load tap changers (LTCs), machined to OEM dimensional specifications.
- OEMMcGraw-Edison
- Model / Series550-BLS (550B)
- OEM part no.BZO-308557
- Part typeNeutral contact
- EquipmentLoad tap changers (LTCs)
- AvailabilityBuilt to order / lead time confirmed at quote
- Internal ref.LTCME55205
Overview
Reversing Stationary Neutral Contact for the McGraw-Edison 550 BLS load tap changer. 3 per kit. Machined to OEM spec.
About the McGraw-Edison 550
The McGraw-Edison 550 is a reactance-type arcing tap switch and one of the most widely deployed LTCs in utility power transformers across North America. During a tap change the contacts bridge two taps briefly through a preventive autotransformer that limits the circulating current, and the arcing contacts open and close under load current on every operation. The main moving contact, stationary contact, and reversing switch contacts bear that duty on every tap change. At 50,000 operations or the manufacturer's recommended inspection interval, contact condition directly determines whether the tap changer will perform reliably between outages.
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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