6
Description
Bus Spacing and Connections
Specific installation features of the SB breakers include 5-
inch pole spacing, and vertical or horizontal bus connections.
The 5-inch pole spacing allows for a standard bus connection
as specified in UL 891, eliminating the requirement for
additional thermal testing. The optional vertical or horizontal
bus connection is available on both fixed or drawout con-
structed breakers. Detailed outline drawings are contained in
the Outline Dimensions section, pages 82-93.
Two-Step Stored Energy Mechanism
A two-step stored energy mechanism is used to close and
open the breaker. Energy is initially stored in the main springs
of the stored energy mechanism. When the breaker is closed,
spring energy is consumed, and sufficient energy is retained
in the breaker to perform the tripping function.
The stored energy mechanism may be charged manually
(standard) or electrically (optional). Push button controls allow
for easy opening and closing. Color-coded indicators clearly
display the opened or closed status of the circuit breaker and
charged or discharged status of the stored energy mecha-
nism.
Once the breaker is closed, the mechanism can be re-
charged. The breaker is now prepared for a rapid open-close
or open-close-open operation
Centralized Controls
The manual charging handle, pushbutton control switches,
and color-coded indicators are grouped in the central es-
cutcheon on the front cover. The U-shaped construction of
the charging handle provides for a firm grip regardless of the
position of the breaker in the switchboard. For safety, the
charging handle and push-to-close pushbutton are inter-
locked. This interlock prevents the breaker from being closed
unless the charging handle is in the stowed position, the
position to which it will automatically return when it is re-
leased. The interlock also prevents the breaker from being
manually charged if the Close button is depressed. Operating
instructions for the stored energy mechanism and controls
are in the Operating Instructions section, pages 16-27.
Main stored energy springs located in the front compartment
Centralized controls and color-coded indicators
Summary of Contents for SBA 1200
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