Opening the Device

Opening Conditions

To open the device, the device must be closed (I).

NOTE: An opening order always takes priority over a closing order.

Opening the Device

The following tables present the different ways to open the device in the different control modes available.

The device can be opened in the following ways in all control modes:

Opening type	Control mode	Accessories	Opening action
Mechanical	Manual, Auto: Local, or Auto: Remote	–	Press the opening pushbutton on the front of the device. This opening action is possible at any time.
Automatic	Manual, Auto: Local, or Auto: Remote	MN undervoltage release, with or without MN delay unit	The MN undervoltage release opens the device automatically in the case of voltage drop.
By external pushbutton	Manual, Auto: Local, or Auto: Remote	External pushbutton wired by customer One of the following accessories: MX standard or communicating opening voltage release MN undervoltage release, with or without MN delay unit	Press the external pushbutton which is connected to the MX opening voltage release or to the MN undervoltage release via the customer terminal block. When the MN undervoltage release is connected to the MN delay unit, the device opens with the corresponding time delay.

Opening type

Control mode

Accessories

Opening action

Mechanical

Manual, Auto: Local, or Auto: Remote

–

Press the opening pushbutton on the front of the device.

This opening action is possible at any time.

Automatic

Manual, Auto: Local, or Auto: Remote

MN undervoltage release, with or without MN delay unit

The MN undervoltage release opens the device automatically in the case of voltage drop.

By external pushbutton

Manual, Auto: Local, or Auto: Remote

External pushbutton wired by customer
One of the following accessories:
- MX standard or communicating opening voltage release
- MN undervoltage release, with or without MN delay unit

Press the external pushbutton which is connected to the MX opening voltage release or to the MN undervoltage release via the customer terminal block.

When the MN undervoltage release is connected to the MN delay unit, the device opens with the corresponding time delay.

In addition, the circuit breaker can be opened in the following ways when Auto control mode is configured.

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Do not operate the circuit breaker without confirming that doing so will not create a hazardous situation. Do not allow any person to work on the electrical network without physically validating the successful execution of the local or remote software actions for opening the circuit breaker or switching off the electrical circuit. Failure to follow these instructions will result in death or serious injury.

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

Do not operate the circuit breaker without confirming that doing so will not create a hazardous situation.
Do not allow any person to work on the electrical network without physically validating the successful execution of the local or remote software actions for opening the circuit breaker or switching off the electrical circuit.

Failure to follow these instructions will result in death or serious injury.

Opening type	Control mode	Accessories	Opening action
Through IO module	Auto: Local or Auto: Remote	MX communicating opening voltage release Isolation module ULP port module IO module	Open the circuit breaker by using the predefined application 2 Breaker Operation of the IO module. When the circuit breaker is set to local control mode by the IO module, the command to open is issued from local pushbuttons wired on digital inputs. When the circuit breaker is set to remote control mode by the IO module, the command to open is issued from remote PLC outputs wired on digital inputs. Refer to DOCA0055•• Enerlin'X IO - Input/Output Application Module for One Circuit Breaker - User Guide.
Through FDM121 display	Auto: Local	MX communicating opening voltage release Isolation module ULP port module IO module	Send a command to open the circuit breaker from FDM121 display connected locally to the circuit breaker through the ULP system. The opening action is password-protected.
Through EcoStruxure Power Commission software	Auto: Local	MX communicating opening voltage release Isolation module	Send a command to open the circuit breaker from EcoStruxure Power Commission software running on a PC connected locally to the device through the mini USB port on the MicroLogic X control unit. This opening action is password-protected. Refer to EcoStruxure Power Commission Online Help.
Through EcoStruxure Power Device app	Auto: Local	MX communicating opening voltage release Isolation module MasterPacT Operation Assistant Digital Module	Send a command to open the circuit breaker from the EcoStruxure Power Device app with MasterPacT Operation Assistant Digital Module, through Bluetooth wireless communication or USB OTG connection. The opening action is password-protected.
Through Modbus communication	Auto: Remote	MX communicating opening voltage release Isolation module ULP port module IFE, EIFE, or IFM interface, or IFE server	Send a command to open the circuit breaker through the Modbus communication network. This opening action is password-protected. Refer to DOCA0105•• MasterPacT MTZ Circuit Breakers with MicroLogic X Control Units - Modbus Communication - User Guide. NOTE: EcoStruxure Power Commission software running on a PC connected to the device through the communication network can be used to send commands to open.
Through IEC 61850 communication	Auto: Remote	MX communicating opening voltage release Isolation module ULP port module IFE or EIFE interface IEC 61850 for MasterPacT MTZ Digital Module	Send a command to open the circuit breaker through the IEC 61850 communication network. This opening action is password-protected. Refer to DOCA0162•• MasterPacT MTZ Circuit Breakers with MicroLogic X Control Units - IEC 61850 Communication Guide.
Through IFE/EIFE webpages	Auto: Remote	MX communicating opening voltage release Isolation module ULP port module IFE or EIFE interface, or IFE server	Send a command to open the circuit breaker from the IFE/EIFE control webpage. This opening action is password-protected. Refer to the relevant document: DOCA0084•• Enerlin'X IFE - Ethernet Switchboard Server - User Guide DOCA0142•• Enerlin'X IFE - Ethernet Interface for One Circuit Breaker - User Guide DOCA0106•• Enerlin'X EIFE - Embedded Ethernet Interface for One MasterPacT MTZ Drawout Circuit Breaker - User Guide

If the device does not open, refer to Troubleshooting.