Potential Transformer (PT) Fuses Potential Transformer (PT) Fuses
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A PT Fuse (Potential Transformer) is a current limiting fuse with a high interrupting rating. It is used to protect the primary windings of a potential transformer or control power transformers (CPT). It is a small dimension ferrule type fuse that mounts in standard clips. Blown fuse indication is available on some series. Voltage ratings are from 0.625 kV to 15.5kV. Current ratings range from 0.05 to 5 amps. Interrupting ratings range from 50 to 120 kA.
Mersen, Bussmann and Littelfuse offer Potential Transformer (PT) fuses.