McGraw-Edison 550-BLS Load Tap Changer Contacts
The McGraw-Edison 550-BLS is a load tap changer found across the utility transformer fleet, and its switching contacts are the primary wear item. The original line is largely out of production, so replacements come from a shop that still makes them. Southern Switch machines and reverse-engineers the full McGraw-Edison 550-BLS contact set in-house in Palm Harbor, Florida, to the original dimensional specification, including complete contact kits, selector switch contacts, reversing switch contacts. Refurbish your worn contacts or order OEM-spec replacements; lead time is confirmed at quote. The 550-BLS is the current contact set for the McGraw-Edison 550B, which it replaced, so a 550B takes this same kit.
550-BLS contacts and kits.
Insulating collar kit · LTC Contacts
LTC contact · machined or refurbished in-house
LTC contact · machined or refurbished in-house
LTC contact · machined or refurbished in-house
LTC contact · machined or refurbished in-house
LTC contact · machined or refurbished in-house
LTC contact · machined or refurbished in-house
LTC contact · machined or refurbished in-house
LTC contact · machined or refurbished in-house
LTC contact · machined or refurbished in-house
LTC contact · machined or refurbished in-house
LTC contact · machined or refurbished in-house
LTC contact · machined or refurbished in-house
Refurbished, reverse-engineered, or new.
Send us your worn 550-BLS contacts and we refurbish them where the base material is sound. Where it is not, we machine new OEM-spec replacements, and where the OEM part is long gone we reverse-engineer it from a sample, a drawing, or a model number. That is the difference from a catalog seller: we are the shop making the part. Full LTC rebuild service is available when the whole tap changer needs work.
Maintenance and background.
McGraw-Edison 550-BLS questions.
Are McGraw-Edison 550-BLS LTC contacts still available?
Yes. The original McGraw-Edison line is largely out of production, so replacements come from a shop that still makes them. Southern Switch machines and, where the part is obsolete, reverse-engineers the full McGraw-Edison 550-BLS contact set in-house in Palm Harbor, FL, to the original dimensional specification.
Can you refurbish my existing 550-BLS contacts, or only supply new?
Both. We refurbish customer-supplied McGraw-Edison 550-BLS contacts where the base material is sound, and machine new OEM-spec replacements where it is not.
How fast can you supply 550-BLS contacts?
Lead time is confirmed at quote and depends on current material availability. In-stock items ship quickly; reverse-engineered first runs take longer.
Tell us which 550-BLS contacts you need, or send a sample. We respond within one business day with availability, a price, and a lead time.