Masterpact MTZ1 Device Operation
Masterpact MTZ1 Device Status Indication
The indicators on the front of the device show the following information:
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Reset button:
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In: the device is closed or open voluntarily (not tripped).
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Out: the device has tripped.
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Position indicator of main contacts: Open or Closed.
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Closing spring and ready-to-close indicator. The state can be one of the following:
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Discharged (no energy to close the circuit breaker).
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Charged not ready-to-close.
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Charged ready-to-close.
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The combination of both indicators gives the device status.
Masterpact MTZ1 Device Status Description
Masterpact MTZ1 Auxiliary Switches (OF)
The position of the device main contacts is indicated by auxiliary switches (OF).
Masterpact MTZ1 Anti-Pumping Function
Masterpact MTZ devices provide a mechanical anti-pumping function. In the event of simultaneous maintained opening and closing orders, the standard mechanism blocks the main contacts in the open position. After a trip due to an electrical fault or intentional opening using the manual or electrical controls, the closing order must first be discontinued, then reactivated to close the circuit breaker. This prevents a cycle of closing and opening.
When remote operation features are used, allow at least four seconds for the spring charging motor (MC) to charge the device closing spring completely before actuating the shunt close (XF).
To prevent the device from closing prematurely, the ready-to-close contact (PF) can be connected in series with the shunt close (XF).
Masterpact MTZ1 Closing Spring Charging
The closing spring must be charged with sufficient energy to close the Masterpact MTZ:
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Manual charge: Charge the mechanism by pulling the spring charging handle down seven times.
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Automatic charge: If the optional spring charging motor (MCH) is installed, the spring is automatically charged after closing.