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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 3 - Preliminary Examination of Circuit Breaker
3.0 GENERAL
Read these instructions carefully and look at the breaker
as it stands out of the compartment before trying to oper-
ate it. Refer to Figures 5a, 5b, 6, 7 and 8.
The complete drawout element includes the circuit
breaker itself and its auxiliaries. The circuit breaker con-
sists of four major components:
1. The operating mechanism.
2. The contacts, operated by the mechanism.
3. The arc chutes, which interrupt the arc which always
results
from opening the breaker under load or short
circuit conditions.
The Amptector
®
solid-state overcurrent tripping sys-
tem.
The remainder of the drawout element includes the fol-
lowing auxiliary components:
1. Interphase insulating barriers which isolate the arc
chutes from each other and from ground.
2. Drawout element frame and rollers.
3. The levering device, for placing the element into its
various positions inside the compartment.
4. The main disconnecting
contacts, for connecting the
breaker to power source and load.
5. The secondary contacts, for connecting the control
circuits to the electrical operating parts of the ele-
ment.
6. The interlocks, which increase the safety of opera-
tion.
7. Drawout element position indicator.
Fig. 5a View Showing Controls on the Panel (Pre 1988).
Digitrip
®
RMS overcurrent tripping system (see
Fig. 5b).
4a.
4b.
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