NOTICE
IF THE BREAKER IS LEVERED OUT FROM THE TEST POSITION TO
THE REMOVE POSITION WITH THE CLOSING SPRINGS CHARGED,
A TRIP FREE CLOSING OPERATION AUTOMATICALLY TAKES
PLACE, BUT THE BREAKER CONTACTS DO NOT CLOSE.
2-6 Drawout Dummy Element
A dummy element consists of a drawout frame or truck
with disconnecting contacts and connecting links between
the upper and lower terminal on each pole. When inserted
into a compartment, it bridges the upper and lower station-
ary disconnecting contacts in each phase. This makes it the
equivalent to an isolating disconnecting switch.
IT MUST BE EMPHASIZED THAT A DUMMY ELEMENT IS
NOT A BREAKER. IT HAS NO CURRENT BREAKING ABIL-
ITY WHATSOEVER. The dummy element is almost always
key interlocked with a breaker or other load interrupting
device to insure that it will be isolated or carrying NO current
before it can be levered to the DISCONNECT position.
Dummy elements require the same size compartment as an
equivalent Type DSII breaker of the same frame size.
2-7 Fixed Circuit Breaker
The Type DSII Fixed Circuit Breaker differs from the drawout
version in that it has no levering device, primary disconnects
and secondary disconnects. A fixed circuit breaker does not
have a padlock feature to hold the breaker in a “trip-free” po-
sition. To insure the proper sequence of operation between
two or more breakers, a key interlock is mounted in the
levering device location.
The breaker stabs have holes for bolting to primary bus con-
nections. Rear mounted terminal blocks serve as secondary
contacts. The basic breaker frame is modified to permit the
fixed breaker to be mounted on a panel (Figure 2-5).
Figure 2-5 Typical Fixed Type DSII Circuit Breaker
Effective July 2010
Instructional Book IB694C694-03
14
EATON CORPORATION www.eaton.com
To Next Page
Loading...
Need help?
General
