Mechanical Interlocking for Transfer Switches

@experts: Topic shared between DOCA0284 and DOCA0285, with profiling; indicate if comments do not apply to both guides

Description

The mechanical interlocking for transfer switches between two MasterPacT MTZ1 circuit breakers prevents the two interlocked circuit breakers from closing at the same time.

VBP Pushbutton Locking Accessory

The VBP pushbutton locking accessory provides redundancy in addition to the mechanical interlocking system.

The use of the pushbutton locking cover is mandatory on each interlocked MasterPacT MTZ circuit breaker. The closing pushbuttons of the interlocked circuit breakers must be locked by padlocks sharing one key to help avoid simultaneous closing orders of interlocked circuit breakers.

For more information about the pushbutton locking cover, refer to VBP Pushbutton Locking Accessory.

Mechanical Interlocking Between Two Circuit Breakers

Two circuit breakers can be mechanically interlocked by cables or by rods so that both circuit breakers cannot be closed at the same time.

For information on the accessory installation, consult the instruction sheet on the Schneider Electric website:

For Interlocking by cables: NVE35522
For Interlocking by rods: NVE35523

IVE Electrical Interlocking Unit

Electrical interlocking between MasterPacT MTZ circuit breakers can be done using the IVE electrical interlocking unit or by using dedicated wiring. The IVE unit is suitable for two circuit breakers only. For three circuit breakers, dedicated wiring is required to perform the electrical interlocking.

For information on the accessory installation, consult the instruction sheet on the Schneider Electric website: 51201201AA