0614CT1701

Masterpact MTZ Locking and Interlocking Accessories

Pushbutton Locking (VBP)

Open and close pushbuttons can be blocked by using the lockable pushbutton cover (VBP). It consists of two transparent covers which can be locked with any of the following:

  • Padlock (not supplied), 5 to 8 mm (0.2 to 0.3 in.)

  • Wire seal

  • Two screws

The opening button and the closing button can be locked independently.

Pushbutton locking (VBP) transparent covers to block access to pushbuttons.

Pushbutton locking (VBP) with padlock

Device Locking in the OFF Position (VCPO and VSPO)

OFF Position Locking with Padlock (VCPO).

OFF Position Locking with Keylock (VSPO).

Two accessories are available for device locking in the OFF position:

  • VCPO with padlocks

  • VSPO with keylocks

The circuit breaker can be locked in the OFF position by physically maintaining pressing down on the opening pushbuttonn:

  • Using padlocks (one to three padlocks, not supplied), shackle diameter 5–8 mm (3/16–5/16 in.)
  • Using keylocks (one or two different keylocks, supplied).

Keys may be removed only when locking is effective (Profalux or Ronis type locks).

The keylocks are available in any of the following configurations:

  • One keylock.

  • One keylock mounted on the device + one identical keylock supplied separately for interlocking with another device.

  • Two different keylocks for double locking.

Profalux and Ronis keylocks are compatible with each other.

A locking kit (without locks) is available for installation of one or two keylocks (Ronis, Profalux, Kirk™ or Castell).

Accessory Compatibility

For Masterpact MTZ1: 3 padlocks or 1 keylock.

For Masterpact MTZ2, MTZ3: 3 padlocks and/or 2 keylocks.

For MTZ1, either keylock or padlock can be used.
For MTZ2 and MTZ3, padlock will always be available when the keylock is selected. Padlock and keylock can be used at the same time.

Device Locking in the Disconnected Position (VSPD)

Disconnected Position Locking with Padlocks.

Located on the device cradle, this option provides a means to lock the circuit breaker in the disconnected position.

  • Using padlocks (standard), up to three padlocks (not supplied).

  • Using keylocks (VSPD option), one or two different keylocks are available.

Another way to lock the circuit breaker in the disconnected position is to use the locks on the cradle. It is feasible only when the door is closed.

Profalux and Ronis keylocks are available with:

  • One keylock.

  • Two different keylocks for double locking.

  • One (or two) keylocks mounted on the device + one (or two) identical keylocks supplied separately for interlocking with another device.

A locking kit (without locks) is available for installation of one or two keylocks (Ronis, Profalux, Kirk or Castell).

Cradle Locking in Connected, Disconnected, and Test Position

Disconnected Position Locking by Keylocks (VSPD)

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 is accessible with the door locked.

  • Kirk key interlocks are available for UL/ANSI and IEC circuit breakers.

  • Ronis, Castell, or Profalux key locks are also available.

  • The key is captive when the key interlock is unlocked.

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

Shutter and Shutter Locking

The shutters automatically block access to the main disconnects when the circuit breaker is in the disconnected, test, or fully withdrawn position.

Shutter locking can be used to lock the shutters and prevent the circuit breaker from being racked in from the disconnected position.

The shutter lock is installed on the cradle front plate and allows the locking operation to be done outside of the cradle compartment. One to three padlocks can be used. (Padlocks are not supplied.)

NOTE: This option is applicable for MTZ2 and MTZ3 only.

Shutter

Shutter Lock

Racking Interlock (VPOC)

Racking Interlock (VPOC)

This device prevents insertion of the racking handle when the cubicle door is open.

Door Interlock Catch (VPEC)

Door Interlock Catch (VPEC)

Mounted on the right or left-hand side of the cradle, this device inhibits opening of the cubicle door when the circuit breaker is in the connected or test position.

If the circuit breaker is put in the connected position with the door open, the door may be closed without having to disconnect the circuit breaker

Interlock Between Racking Handle and Open Pushbutton (IBPO)
(MTZ2, MTZ3 Only)

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 Push to Open button is pressed.

Cradle Rejection Kit

Cradle Rejection Kit

The cradle rejection feature (standard) pairs the properly designated circuit breaker or switch with the appropriate cradle assembly.

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