Cradle Locking and Interlocking

Disconnected Position Locking Provisions

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. Key is captive when key interlock is unlocked.

• Locking on disconnected, test, and connected positions is optional for IEC circuit breakers and standard for UL/ANSI circuit breakers.

Door Interlock (NW)

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.

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.

The optional cable door interlock prevents the compartment door from being opened when the circuit breaker is in the closed position. This kit includes:

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

Source changeover interlocks allow mechanical interlocking between two or three circuit breakers (fixed and drawout).

Source Changeover Interlocks

		Interlocking Two Circuit Breakers Interlocking Two Mains Using Rods Interlocking Two Mains Using Cables Interlocking Three Circuit Breakers Using Cables Interlocking Two Mains and One Generator Interlocking Two Mains and One Tie Interlocking Three Mains
Two NW Circuit Breakers Interlocked Using Rods	Three NW Circuit Breakers Interlocked Using Cables

(VPOC)

The racking interlock prevents racking in the circuit breaker when the door is open. (Insertion of the circuit breaker racking handle is not possible when the compartment door is open.)

Automatic Spring Discharge Mechanism (NW)

The automatic spring discharge mechanism is standard for UL and ANSI circuit breakers, and optional for IEC circuit breakers. It releases the closing spring energy when the circuit breaker is moved from the disconnected position to the fully withdrawn position. Not available for IEC Rated MasterPacT NT circuit breakers.

Rail padlocking is standard for UL, ANSI, and IEC cradles. When used in combination with the disconnected position locking device, rail padlocking prevents the movement of the circuit breaker from the disconnected position to the fully withdrawn position when the padlock hasp is pulled out and locked.