Electrical Distribution Protection

Presentation

MicroLogic X control units are designed to provide protection against overcurrents and ground-fault currents.

Description

When choosing protection characteristics, take into account:

oOvercurrents (overloads and short-circuits) and potential ground-fault currents

oConductors that need protection

oCoordination and selectivity between the devices

oThe presence of harmonic currents

Protection characteristics can be represented on a trip curve that shows the circuit breaker trip time as a function of the measured current and protection settings. Protection settings are indexed on the rated current In of the MicroLogic X control unit.

Rated Current In

The protection setting ranges depend on the rated current In, defined by the sensor plug inserted in the MicroLogic X control unit.

The sensor plug can be replaced or modified. Mechanical mismatch protection prevents the installation of a sensor plug that is not compatible with the circuit breaker frame.

For IEC standard circuit breakers, the range of sensor plugs available is shown in the following table.

In	Commercial reference	Frame rated current
		MTZ1					MTZ2								MTZ3
		06	08	10	12	16	08	10	12	16	20	25	32	40	40	50	63
400 A	LV847053	✔	✔	✔	–	–	✔	✔	–	–	–	–	–	–	–	–	–
630 A	LV833091	✔	✔	✔	✔	–	✔	✔	✔	–	–	–	–	–	–	–	–
800 A	LV833092	–	✔	✔	✔	✔	✔	✔	✔	✔	–	–	–	–	–	–	–
1,000 A	LV833093	–	–	✔	✔	✔	–	✔	✔	✔	✔	–	–	–	–	–	–
1,250 A	LV833094	–	–	–	✔	✔	–	–	✔	✔	✔	✔	–	–	–	–	–
1,600 A	LV833095	–	–	–	–	✔	–	–	–	✔	✔	✔	✔	–	–	–	–
2,000 A	LV833982	–	–	–	–	–	–	–	–	–	✔	✔	✔	✔	–	–	–
2,500 A	LV833983	–	–	–	–	–	–	–	–	–	–	✔	✔	✔	–	–	–
3,200 A	LV833984	–	–	–	–	–	–	–	–	–	–	–	✔	✔	–	–	–
3,600 A	LV836390	–	–	–	–	–	–	–	–	–	–	–	–	✔	–	–	–
4,000 A	LV847820	–	–	–	–	–	–	–	–	–	–	–	–	✔	–	–	–
2,000 A	LV847821	–	–	–	–	–	–	–	–	–	–	–	–	–	✔	–	–
2,500 A	LV847822	–	–	–	–	–	–	–	–	–	–	–	–	–	✔	✔	–
3,200 A	LV847823	–	–	–	–	–	–	–	–	–	–	–	–	–	✔	✔	✔
3,600 A	LV836391	–	–	–	–	–	–	–	–	–	–	–	–	–	✔	✔	✔
4,000 A	LV847824	–	–	–	–	–	–	–	–	–	–	–	–	–	✔	✔	✔
5,000 A	LV847825	–	–	–	–	–	–	–	–	–	–	–	–	–	–	✔	✔
6,300 A	LV847826	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	✔

For UL standard circuit breakers, the range of sensor plugs available is shown in the following table.

In	Commercial reference	Frame rated current
		MTZ1				MTZ2						MTZ3
		06	08	12	16	08	12	16	20	25	30	40	50	60
400 A	LV847053	✔	✔	–	–	✔	–	–	–	–	–	–	–	–
600 A	LV848823	✔	✔	✔	–	✔	✔	–	–	–	–	–	–	–
800 A	LV833092	–	✔	✔	✔	✔	✔	✔	–	–	–	–	–	–
1,000 A	LV833093	–	–	✔	✔	–	✔	✔	✔	–	–	–	–	–
1,200 A	LV848824	–	–	✔	✔	–	✔	✔	✔	✔	–	–	–	–
1,600 A	LV833095	–	–	–	✔	–	–	✔	✔	✔	✔	–	–	–
2,000 A	LV833982	–	–	–	–	–	–	–	✔	✔	✔	–	–	–
2,500 A	LV833983	–	–	–	–	–	–	–	–	✔	✔	–	–	–
3,000 A	LV848825	–	–	–	–	–	–	–	–	–	✔	–	–	–
2,000 A	LV847821	–	–	–	–	–	–	–	–	–	–	✔	–	–
2,500 A	LV847822	–	–	–	–	–	–	–	–	–	–	✔	✔	–
3,000 A	LV848826	–	–	–	–	–	–	–	–	–	–	✔	✔	✔
3,200 A	LV847823	–	–	–	–	–	–	–	–	–	–	✔	✔	✔
3,600 A	LV836391	–	–	–	–	–	–	–	–	–	–	✔	✔	✔
4,000 A	LV847824	–	–	–	–	–	–	–	–	–	–	✔	✔	✔
5,000 A	LV847825	–	–	–	–	–	–	–	–	–	–	–	✔	✔
6,000 A	LV848827	–	–	–	–	–	–	–	–	–	–	–	–	✔

For ANSI standard circuit breakers, the range of sensor plugs available is shown in the following table.

In	Commercial reference	Frame rated current
		MTZ1	MTZ2					MTZ3
		08	08	16	20	32	40	32	40	50	60
400 A	LV847053	✔	✔	–	–	–	–	–	–	–	–
600 A	LV848823	✔	✔	–	–	–	–	–	–	–	–
800 A	LV833092	✔	✔	✔	–	–	–	–	–	–	–
1,000 A	LV833093	–	–	✔	✔	–	–	–	–	–	–
1,200 A	LV848824	–	–	✔	✔	–	–	–	–	–	–
1,250 A	LV833094	–	–	✔	✔	–	–	–	–	–	–
1,600 A	LV833095	–	–	✔	✔	✔	–	–	–	–	–
2,000 A	LV833982	–	–	–	✔	✔	✔	–	–	–	–
2,500 A	LV833983	–	–	–	–	✔	✔	–	–	–	–
3,000 A	LV848825	–	–	–	–	✔	✔	–	–	–	–
3,200 A	LV833984	–	–	–	–	✔	✔	–	–	–	–
3,600 A	LV836390	–	–	–	–	–	✔	–	–	–	–
4,000 A	LV847820	–	–	–	–	–	✔	–	–	–	–
2,000 A	LV847821	–	–	–	–	–	–	✔	✔	–	–
2,500 A	LV847822	–	–	–	–	–	–	✔	✔	✔	–
3,000 A	LV848826	–	–	–	–	–	–	✔	✔	✔	✔
3,200 A	LV847823	–	–	–	–	–	–	✔	✔	✔	✔
3,600 A	LV836391	–	–	–	–	–	–	–	✔	✔	✔
4,000 A	LV847824	–	–	–	–	–	–	–	✔	✔	✔
5,000 A	LV847825	–	–	–	–	–	–	–	–	✔	✔
6,000 A	LV848827	–	–	–	–	–	–	–	–	–	✔

MicroLogic 2.0 X Control Unit

MicroLogic 2.0 X control units for IEC standard provide:

oLong-time overcurrent protection (Ir)

oInstantaneous overcurrent protection (Isd)

The protection functions of MicroLogic 2.0 X control units operate without an auxiliary power supply. The control unit is powered by the current flowing through the circuit breaker.

MicroLogic 3.0 X Control Unit

MicroLogic 3.0 X control units for UL standard provide:

oLong-time overcurrent protection (Ir)

oInstantaneous overcurrent protection (Ii)

The protection functions of MicroLogic 3.0 X control units operate without an auxiliary power supply. The control unit is powered by the current flowing through the circuit breaker.

MicroLogic 5.0 X Control Unit

MicroLogic 5.0 X control units for IEC and UL standards provide:

oLong-time overcurrent protection (Ir)

oShort-time overcurrent protection (Isd)

oInstantaneous overcurrent protection (Ii)

The protection functions of MicroLogic 5.0 X control units operate without an auxiliary power supply. The control unit is powered by the current flowing through the circuit breaker.

MicroLogic 6.0 X Control Unit

MicroLogic 6.0 X control units for IEC and UL standards provide:

oLong-time overcurrent protection (Ir)

oShort-time overcurrent protection (Isd)

oInstantaneous overcurrent protection (Ii)

oGround-fault protection (Ig)

The protection functions of MicroLogic 6.0 X control units operate without an auxiliary power supply. The control unit is powered by the current flowing through the circuit breaker.

MicroLogic 7.0 X Control Unit

MicroLogic 7.0 X control units for IEC standard provide:

oLong-time overcurrent protection (Ir)

oShort-time overcurrent protection (Isd)

oInstantaneous overcurrent protection (Ii)

oEarth-leakage protection (IΔn)

The protection functions of MicroLogic 7.0 X control units operate without an external auxiliary power supply.

The MicroLogic X control unit is powered by the current flowing through the circuit breaker. In addition a VPS voltage power supply module is necessary to ensure the operation of the earth-leakage protection in the case of a fault with very low current.

DIN / DINF and SELLIM Instantaneous Protections

DIN / DINF and SELLIM instantaneous protections are internal protections used when the short-circuit current reaches the withstand limit of the circuit breaker. These protections are not adjustable and are unlikely to be triggered in normal operating conditions.

The following predefined events can be generated by the DIN / DINF and SELLIM instantaneous protections.

Code	Event	History	Severity
0x6406 (25606)	Ultimate self-protection trip (SELLIM)	Trip	High
0x641D (25629)	Ultimate self-protection trip (DIN / DINF)	Trip	High
0x6306 (25350)	Ultimate self-protection (SELLIM) operate	Protection	Medium
0x631D (25373)	Ultimate self-protection (DIN / DINF) operate	Protection	Medium

Predefined events cannot be modified by the user. For general information about events, refer to Event management.

Recommended Actions

Code	Event	Recommended actions
0x6406 (25606)	Ultimate self-protection trip (SELLIM)	Reset the device or use the Power restoration assistant within the EcoStruxure Power Device app.
0x641D (25629)	Ultimate self-protection trip (DIN / DINF)	Reset the device or use the Power restoration assistant within the EcoStruxure Power Device app.

Resetting a Trip Event

For information about resetting the circuit breaker after a trip due to an electrical fault, refer to the relevant document:

oMasterPact MTZ1 - Circuit Breakers and Switch-Disconnectors - User Guide

oMasterPact MTZ2/MTZ3 - Circuit Breakers and Switch-Disconnectors - User Guide