
Masterpact™ NT and NW Universal Power Circuit Breakers
Accessories
59
05/2014
© 2000–2014 Schneider Electric
All Rights Reserved
Cradle Locking and Interlocking
Disconnected Position Locking
The circuit breaker can be locked in the disconnected
position by key interlock (optional) or padlock (standard).
The key interlock is on the cradle and accessible with the
door locked.
•
Kirk key interlocks are available for UL/ANSI circuit
breakers; for IEC circuit breakers, Ronis, Castell, or
Profalux key locks are available. Captive key when
unlocked.
•
Locking on disconnected, test, and connected positions
is optional for IEC circuit breakers and standard for
UL/ANSI circuit breakers.
Door Interlock (VPEC)
The door interlock prevents the compartment door from being opened
when the circuit breaker is in the connected or test position. If the circuit
breaker is put into the connected position with the door open, the door can
be closed without disconnecting the circuit breaker. For greater protection,
this interlock can be used in conjunction with the open door racking
interlock.
Racking Interlock Between Racking Handle and Off Position (IBPO)
The racking interlock is standard for UL and ANSI circuit breakers, and optional for IEC circuit
breakers. It prevents insertion of the racking handle unless the OFF push button is pressed. Not
available for IEC Rated Masterpact NT circuit breakers.
Cable Door Interlock Kit
This option prevents the compartment door from being opened when the circuit breaker is in the closed
position. This kit includes:
Disconnected
Position Locking
Provisions
Door Interlock (NW)
Figure 12: Cable Door Interlock Kit Contents
Kit Contents
(A) Panel Interlocking Plate
(B) Circuit Breaker Interlocking Plate
(C) Interlocking Cables
(D) Bolts with Washers
(E) Guide-Bolt with Washer
(F) Interlocking Bracket
(G) Calibration Tray
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