Figure 4-15 shows the parts relationship for padlocking in
the trip-free shutter up condition. The three major parts are
interleaved and assembled on the left hand side of the lever-
ing device assembly.
1. Shutter
2. Trip Plate
3. Padlock Interlock Lever
The padlock interlock lever is located between the trip plate
and padlock plate. It is pivoted on a fixed center toward the
rear of the breaker. The front part of this lever has a slop-
ing slot in which a projection from the trip plate extends.
Horizontal movement of the trip plate by cam action of the
projection against the walls of the slot causes the front of
the interlock lever to move up or down. The interlock lever
is pushed upward by a spring. This lever also has a short pin
extending outward, normally into a curved notch in the bot-
tom edge of the padlock plate.
Padlock Plat Notch
Padlock Plate
Trip Plate
Front Panel
Shutter
Levering Device Worm Shaft
Projection on Shutter
Bent Tab on Padlock Plate
Projection on Trip Plate
Padlock Interlock Lever
Pin on Padlock Interlock Lever
Trip Shaft
Figure 4-15 Padlock Device (Locked Trip-Free with Shut-
ter Raised)
To padlock the breaker with the shutter closed, push the trip
plate in and pull the padlock plate forward. This exposes the
padlock slot in the padlock plate. Insert the padlock and lock.
Movement of the trip plate pushes the front end of the
padlock interlock lever down, moving its pin downward and
out of the notch in the padlock plate. Forward movement of
the padlock plate and backward movement of the trip plate
places the pin in the padlock interlock lever behind the notch
in the padlock plate. With the padlock plate held forward,
the padlock interlock lever cannot move. Consequently, the
projection from the trip plate is held in the slot in the padlock
interlock lever. This holds the breaker locked in the trip-free
condition until the padlock is removed and the members are
returned to their normal positions by return springs. While
locked, the shutter is prevented from downward travel by a
horizontal projection striking a bent over tab on the padlock
plate.
4-6 DSLII Circuit Breaker and Fuse Truck
An overall description of Type DSLII Circuit Breakers and
Fuse Trucks is provided in Section 3 (Figure
3-2). More detailed information is provided here relative to
application, operation, replacement and installation. Table
4.1 outlines the available limiters recommended for use with
DSLII circuit breakers.
If current limiters are sized in keeping with Table 4.1 recom-
mendations, the circuit breaker will function and interrupt
routine fault currents. Infrequent high faults are cleared by
the limiters. The limiters protect the circuit breaker on faults
above the rating of the breaker. The limiters will blow below
the circuit breaker short-time rating, if the fault currents
equal the system maximum capacity.
In some applications the current limiters are sized smaller
than necessary for protection of the DSLII circuit breaker
in order to provide protection for downstream equipment.
When this is done, the current limiters will blow on fault cur-
rents which could have been satisfactorily interrupted by the
basic circuit breaker.
Type DSII-FT32 and DSII-FT40 fuse trucks provide for sepa-
rate mounting of current limiting fuses on drawout
Effective July 2010
Instructional Book
IB694C694-03
47
eaton corporation
www.eaton.com
