Circuit Breaker/Structure Interfacing; Interface Interlocks/Interfacing Check; Figure 14. Engaging Extension Rails In A Lower Circuit Breaker Compartment; Figure 15. Typical Vcp-W Circuit Breaker Bottom View - Eaton VCP-W Series Instructions For Installation/Operation/Maintenance/Servicing

Instruction Booklet IB131006EN
Effective March 2019
Figure 14. Engaging extension rails in a lower circuit breaker
compartment.
1. Ground contact
2. Secondary disconnect
3. Close floor tripper
4. Levering latch
5. Trip floor tripper
6. Code plates
7 . MOC operator
8. TOC operator (Non-BPI pan assembly

Figure 15. Typical VCP-W circuit breaker bottom view.

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operation, and maintenance of type
VCP-W vacuum circuit breakers

4.9 Circuit breaker/structure interfacing

m WARNING
NEVER DISABLE OR DEFEAT ANY INTERLOCKS. THEY ARE INTENDED FOR
PROPER AND SAFE OPERATION. FAILURE TO COMPLY COULD RESULT IN
DEATH, SEVERE PERSONAL INJURY, AND/OR PROPERTY DAMAGE DUE TO
THE HAZARDOUS VOLTAGE PRESENT.
Type VCP-W circuit breakers are supplied with a series of interlocks
to insure safe and proper interfacing between the circuit breaker and
its compartment. Specific interlocks are described in the next para-
graph to provide proper familiarization. An interfacing check should
be performed as also described in the next paragraph.

4.9.1 Interface interlocks/interfacing check

Refer to Figures 7 , 9, and 15 for visual interlock and interface check
references. The following interlocks are provided to ensure safe and
proper operation.
Code plates
A coding plate is fastened to the bottom front edge of the breaker
compartment. There is also a coding plate fastened to the front of
the breaker. If the breaker has a lower interrupting rating than the
rating of the compartment, or if the voltage and continuous current
characteristics do not match, the coding plate on the compartment
will prevent the entrance of the breaker into the compartment. In
general, per the IEEE standards, a higher rated breaker is always
permitted to be inserted into a lower rated cell; however, there are
certain physical characteristics of the breakers that may still prevent
this from happening.
EVEN WITH THE CODING PLATES, IT IS POSSIBLE TO PUT A BREAKER INTO
THE COMPARTMENT THAT'S CONTROL WIRING IS NOT COORDINATED
WITH THAT OF THE COMPARTMENT. ALWAYS CHECK THE SHOP ORDER
DRAWING TO MAKE SURE THE CONTROL WIRING OF THE BREAKER AND
THE COMPARTMENT ARE THE SAME.
Maintenance interlock
This interlock trips, closes, and trips the circuit breaker if it is
closed and charged as the circuit breaker is withdrawn from the
DISCONNECT (BPI pan assembly) or DISCONNECT/TEST posi-
tion on to the extension rails or rolled out of the cell for the direct
roll-in-breaker. The circuit breaker open and closing springs are,
therefore, discharged. A closed breaker cannot be moved into the
DISCONNECT (BPI pan assembly) or DISCONNECT/TEST position
from the extension rails, or from the floor as a roll-on-floor breaker.
This interlock consists of the interaction between the switchgear cell
features and the close floor tripper and the trip floor tripper found
under the breaker per Figure 15.
Instructions for installation,
NOTICE