Opening the Circuit Breaker

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

Opening Conditions

To open the circuit breaker, the circuit breaker must be closed (I).

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

Opening the Circuit Breaker

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

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

Opening type	Accessories	Opening action
Mechanical	–	Press the opening pushbutton on the front of the circuit breaker. This opening action is possible at any time.
Automatic	MN undervoltage release, with or without MN delay unit	The MN undervoltage release opens the circuit breaker automatically in the case of voltage drop.
By external pushbutton	External pushbutton wired by customer One of the following accessories: MX 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 circuit breaker opens with the corresponding time delay.

Opening type

Accessories

Opening action

Mechanical

–

Press the opening pushbutton on the front of the circuit breaker.

This opening action is possible at any time.

Automatic

MN undervoltage release, with or without MN delay unit

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

By external pushbutton

External pushbutton wired by customer
One of the following accessories:
- MX 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 circuit breaker opens with the corresponding time delay.

Additionally, the circuit breaker can be opened in the following ways when Auto Local or Auto Remote 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 FDM121 display	Auto Local	BCIM module MX communicating opening voltage release ULP port module	Send a command to open the circuit breaker from FDM121 display connected locally to the circuit breaker through the ULP system. This opening action is only allowed when Auto Local is configured.
Through Modbus communication	Auto Remote	BCIM module MX communicating opening voltage release 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 only allowed when Auto Remote control mode is configured. Refer to DOCA0384•• MasterPacT, ComPacT, PowerPacT Circuit Breakers - Modbus Communication - User Guide in Related Documents at the beginning of this guide.
Through IFE/EIFE webpages	Auto Remote	BCIM module MX communicating opening voltage release 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 only allowed when Auto Remote control mode is configured. Refer to the relevant document in Related Documents at the beginning of this guide: 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

Opening type

Control mode

Accessories

Opening action

Through FDM121 display

Auto Local

BCIM module
MX communicating opening voltage release
ULP port module

Send a command to open the circuit breaker from FDM121 display connected locally to the circuit breaker through the ULP system.

This opening action is only allowed when Auto Local is configured.

Through Modbus communication

Auto Remote

BCIM module
MX communicating opening voltage release
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 only allowed when Auto Remote control mode is configured.

Refer to DOCA0384•• MasterPacT, ComPacT, PowerPacT Circuit Breakers - Modbus Communication - User Guide in Related Documents at the beginning of this guide.

Through IFE/EIFE webpages

Auto Remote

BCIM module
MX communicating opening voltage release
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 only allowed when Auto Remote control mode is configured.

Refer to the relevant document in Related Documents at the beginning of this guide:

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 circuit breaker does not open, refer to MasterPacT MTZ Troubleshooting.