73
Instruction Booklet IB 33-790-1J
Effective November 2010
Instructions for Low Voltage Power
Circuit Breakers Types DS and DSL
EATON CORPORATION www.eaton.com
Section 10 - Fixed Breakers
10.0 GENERAL
Fixed Breakers differ from the drawout version in that
they do not have levering device, primary disconnects
and secondary disconnects. They do have padlock fea-
ture to hold the breaker in “trip-free” position. Key inter-
lock mounted in the location of levering device may also
be supplied to insure proper sequence of operation
between two or more breakers. This insures that before
the interlock key can be remove
d to be used in another
location the circuit breaker must be opened and held in
trip-free position. The breaker stabs have holes for bolt-
ing to the bus connections. Terminal blocks mounted at
the back of the breaker are used as secondary contacts.
The frame is modified so that the breaker can be
mounted on the panel.
Section 11 - Drawout Dummy Elements
11.0 GENERAL
A dummy element consists of a drawout frame or truck
with disconnecting contacts and with connecting links
bet
ween the upper and lower terminals on each pole.
When inserted into a compartment it bridges the upper
and lower stationary disconnecting contacts in each
phase, and is thus equivalent to an isolating disconnect-
ing switch.
It must be emphasized that a dummy is not a breaker,
and has no current breaking ability whatsoever; there-
fore, it is almost invariably key interlocked with a breaker
or other load interrupting device, to insure that it will be
isolated or
at least carrying NO current before it can be
levered out to the disconnected positions.
Dummy element requires the same size compartments
as those of equivalent type DS breakers of the same
frame sizes. The key interlock is of the same type and
operates in the same manner as that described in Sec-
tion 9 for type DS-3200 and DS-4000 drawout fuse
trucks.
To Next Page
Loading...
Need help?
General
