I.
B.
694C694-02
SECTION
3:
EQUIPMENT DESCRIPTION
3-1
TYPE DSll CIRCUIT BREAKER
Type
OSI
I Circuit Breakers are designed specifically for
use
in
metal enclosed low voltage switchgear assem-
blies (Figure 3-1).
The controls and indicators are functionally grouped
on
the front of the circuit breaker. Easy access to the
stored energy mechanism and control devices is gained
by removing the circuit breaker faceplate. Inspection,
minor maintenance, and many replacement functions
II
lnterphase Barrier
fl
Arc Chutes
El
Secondary Disconnects
11
Main Disconnect
El
Levering Device Arm
11
Metal Faceplate
lfl
Trip Unit
El
Emergency Charge Handle
II
Trip Unit Sensors
involving the mechanism, control, and/or accessory
devices can be easily accomplished.
Page
9
DSll Circuit Breakers are available with either a manual-
ly operated or electrically operated two-step stored
energy mechanism. It provides positive control of the
closing instant.
Six continuous current frame sizes, 800 through 5000
amps, are covered by just three physically different cir-
cuit breaker sizes. A variety of optional accessories are
available and common to all circuit breaker frames.
Figure 3-1 Type OSI/ Circuit Breaker (Front
and
Rear Views)
Effective
07
/97
Courtesy of NationalSwitchgear.com
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