12
Installation Instructions
CAUTION: Do not attempt to install a trip unit with the
breaker “Closed” or “Charged”. Make certain breaker
is “Open” and “Discharged” as shown above. Personal
injury or mechanical damage may occur.
Installation of Electronic Trip Unit
The SB Breaker has a built-in interlock device that prevents
the breaker from being closed when there is not an installed
trip unit. This same interlock device will trip the breaker when
the trio unit is removed.
Electronic Trip Unit
1.) Remove the 8 screws from breaker front cover.
To install the trip unit, the front cover of the breaker must first
be removed. This is done by removing the four (4) recessed
Phillips head screws in positions 2, 3, 6, and 7 and the four
(4) Phillips head screws in positions 1 ,4, 5 and 8 that hold the
front cover in place.
NOTE: For more complete information on other stan-
dard and optional features of the Electronic Trip Unit,
see Siemens Electronic Trip Unit for Type SB Circuit
Breakers Information and Instruction Guide, Bulletin
2.20-3A.
2.) Lift off front cover.
On trip units with ground fault protection, the ground fault
selection switch on the side of the trip unit must be set to the
appropriate sensing scheme—Residual or Source Ground/
Zero Sequence—prior to installing the trip unit. The trip unit
is pre-set at the factory to a residual sensing
3.) Set Ground Fault Selection Switch
Courtesy of NationalSwitchgear.com
To Next Page
Loading...
Need help?
General
