The use of unauthorized parts in the repair of the equipment, or tampering by unqualified
personnel can result in hazardous conditions, that can result in death, serious injury or
Follow all safety instructions contained herein.
Note: A preventive maintenance program
is not intended to cover reconditioning or
major repair, but should be designed to
reveal, if possible, the need for such
actions in time to prevent malfunctions
Recommended hand tools
The type 38-3AH3 vacuum circuit breaker
uses both standard SAE (U.S. customary)
and metric fasteners. Metric fasteners are
used for the vacuum interrupters and in
the vacuum interrupter/operator module.
SAE (U.S. customary) fasteners are used in
most other locations. This list of hand tools
describes those normally used in
disassembly and re-assembly procedures.
Sockets and open-end wrenches:
7, 8, 10, 13, 16, 17, 18, 19 and 24 mm
Hex keys: 2, 5, 6, 8 and 10 mm
Deep sockets: 19 and 24 mm
Torque wrench: 0 - 150 Nm
(0 - 100 ft-lbs).
SAE (U.S. customary):
Socket and open-end wrenches:
5/16, 3/8, 7/16, 1/2, 9/16, 11/16, 3/4
and 7/8 inches
Hex keys: 3/16 and 1/4 inches
Screwdrivers: 0.032 x 1/4 inches wide
and 0.055 x 7/16 inches wide
Drift pins: 1/8, 3/16 and 1/4 inches
Retaining-ring pliers (external type, tip
diameter 0.038 inches).