PIN-PISTON 7N0373 - Caterpillar

SR 4 Generators Using A1-Type (VR-1) Voltage RegulatorsTwo types of surge suppressors with different voltages are used with the A1-type (VR-1) voltage regulators on SR 4 Generators. The Cat part number is listed in the Parts Books with the regulator assembly, but the suppressor type is not identified by the Cat part number on either type suppressor. The two suppressors can be identified by the General Electric (GE) part number:
... GE No. V150PA20A is for 150 volts on line to neutral; Cat part number is 4W5272.... GE No. V275PA40A is for 275 volts on line to line; Cat part number is 4W5273.Insert these GE part numbers opposite the Cat part numbers in the parts books.