Pennsylvania Transformer Technology (PTT) is the authorized supplier of OEM replacement parts for McGraw-Edison, Cooper Power and Pennsylvania Transformer load tap changers, and for McGraw-Edison, Cooper Power, Federal Pacific and Pennsylvania Breaker circuit breakers. PTT stocks contacts, gaskets, O-ring kits, reversing kits, hydraulic pump kits, coils and other wear parts, and can ship emergency breaker components quickly. Call (724) 873-2100 or complete the form below and include your model and nameplate details for a quote. Fun fact: The McGraw-Edison 397D On-Load Tap Changer (LTC) is a durable, reliable workhorse that can be maintained without specialized equipment or complex PLC training—and it’s still actively manufactured by the original OEM in the same facility where it was developed. Alongside the McGraw 396, 550, and V series, it remains an invaluable grid asset, backed by dedicated OEM field employees. We’re proud to support these tap changers and the skilled men and women who keep them running every day.
As the original manufacturer behind McGraw-Edison, Cooper Power and Pennsylvania Transformer designs, PTT supplies exact-fit replacement parts and maintenance kits for these tap changers. Our engineering group holds the historical design and test data for these units.
Yes. The McGraw-Edison 397D on-load tap changer (LTC) is still manufactured by the original equipment manufacturer in the same facility where it was developed. PTT's Power Solutions Division supports it with OEM parts and dedicated OEM field employees.
The 397D combines reliable operation with a serviceable design that does not require specialized equipment or complex programmable logic controller (PLC) training for maintenance. McGraw-Edison 396, 397, 550 and V series tap changers remain valuable grid assets, supported by experienced field technicians who help keep this equipment operating reliably.
PTT stocks parts and kits for McGraw-Edison, Cooper Power, Federal Pacific and Pennsylvania Breaker oil circuit breakers, from hydraulic pump kits to contact blades and stationary shoes.
PTT's Power Solutions Division can rebuild or supply complete new breaker mechanisms, including OA3, OA4 and M01.
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Find answers about ordering OEM replacement parts for load tap changers and oil circuit breakers, including what to send us and which models we support.
PTT is the authorized supplier of replacement parts for McGraw-Edison, Cooper Power and Pennsylvania Transformer load tap changers. Send your model and nameplate details, or call (724) 873-2100, and a PTT parts specialist will quote the contacts, gaskets, kits and hardware you need.
Request a parts quote.
Provide the equipment model, the serial number from the nameplate, and any existing part number or a photo of the part. With those details PTT can confirm exact fit against its original design records.
Send your nameplate details.
Check the nameplate on the tap changer for the model and serial number. If the nameplate is missing or unreadable, send photos of the unit and its major components, and PTT can help identify it using its original McGraw-Edison, Cooper Power and Pennsylvania Transformer design records.
Send photos with a parts request.
A load tap changer maintenance kit groups the parts that wear during routine service, such as main and stationary contacts, gaskets, O-rings, pins and hardware, so crews have everything on hand for a planned outage. Exact contents vary by tap changer model.
See supported load tap changer models.
Yes, for the McGraw-Edison, Cooper Power, Federal Pacific and Pennsylvania Breaker models PTT supports, including AHE, AHJ, AHP, ALP, CF, CG, RHE, RHF, PB72, PB145 and PB245. Contact PTT with the nameplate data to check availability.
View supported circuit breaker models.
Yes. PTT's Power Solutions Division can rebuild existing breaker mechanisms or supply complete new mechanisms, including the OA3, OA4 and M01. Send the breaker model and nameplate details, and a PTT parts specialist will confirm the right mechanism and provide a quote.
Learn about breaker mechanisms.
Yes. PTT field service technicians based in Canonsburg, PA are trained in transformer and circuit breaker repair, refurbishment and installation, including load tap changer and breaker parts replacement.
Explore PTT transformer service solutions.
PTT's Power Solutions Division services transformers and high-voltage breakers from other original equipment manufacturers (OEMs). Parts availability depends on the make and model, so contact the parts team with your nameplate details to confirm what PTT can supply.
Contact PTT sales and support.
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