MCCB & ACB

Building a New Electric World

Merlin Gerin MCCB & ACB Dec,2004

Prescription – Tarek Ismail - 12/04 2

Agenda

MCCB offer• Easypact

• Compact NS

ACB offer

• Masterpact NT

•Masterpact NW


IEC 947-2 Definitions

In : Rated current

Ue : Rated operational voltage

Ui : Rated insulation voltage

Uimp : Rated impulse withstand

Icu : Rated ultimate short circuit breaking capacity

Ics : Rated service short circuit breaking capacity

Icw : Rated short circuit withstand capacity

Cat A & Cat B circuit breakers


IEC 947-2 Definitions

Disconnector Circuit Breaker Disconnector-Circuit Breaker


Characteristics of circuit breakers

Rated current & ambient temperature

Number of poles Cascading

Continuity of service : Selectivity Withdrawability

Trip unit ( TM & Electronic)

Accessories & Interlocking

Mechanical & electrical endurance

Network monitoring (Communication)


Basic parts of a circuit breaker

Switching device- Arc chamber- Fixed contact- Moving contact- Spring

Trip unit- Thermal-Magnetic trip unit- Solid state trip unit


Function of a circuit breaker

To switch on/off the circuit

Protection against :-- Over load- Short circuit

- Earth leakage

To guarantee :-- The dependability of your installation- The safety of the end-user and equipment’s


How to choose a breaker ?

Basic Criteria- Rating ( U , I )

- Breaking capacity - Number of poles (Neutral distribution system)- IEC Standard- Type of Load to be protected :-(Generator , Motor , Direct current ,………ect.)



2 - “ Continuity of service “ Criteria - Selectivity - Withdrawability - Maintainability

3 - “ Performing “ Criteria- Cascading ( limitation of current )- Reverse feeding without reduction in performance



4 - “ Comfort “ Criteria- Simple to install , easy to work with .

- Field installable accessories ( e.g Timers , push buttton , impulse relays , ……ect. In Multi9 products )

- work monitoring and communication .


Current Limitation

• The aim :

• To limit the fault current crossing downstream the breaker

• Advantage :

To reduce :

• Electromagnetic effects ( Measurements )

• Mechanical stresses ( Bas bars )

• Thermal effects ( Conductors )


Cascading

• Cascading is the use of current limiting capacity of the circuit breaker to permit installation of lower rated and therefore lower cost down stream the breaker .

• Cascading advantages :-

• Reduce C.B cost

• Reduce mechanical effect ( Bas bars )

• Reduce thermal effects ( Cables )

• Reduce electromagnetic effect ( Measuring devices )

Cascading = Reduction of the installation cost


MCCB offer presentation

New EasyPact up to 100A

New Compact NS up to 3200A


New EasyPact …… from 15 to 100 A


EasyPact range

30

18

10

KA 380V

100 A


Electrical Auxiliaries


Electrical Accessories


New...MCCB Compact NS From 100 to 3200 A range

4 volumes from 100 to 3200 A

4 sizes from 25 to 150 kA

NS 80 H-MA

NS 400 to 630

NS 100 to 250

NS 630b to 1600

NS 1600b to 3200For

Motors


New breaking technology roto-active breaking

0531

00

E62

669

E62

670

Fixed contact

Breakingenclosure

Breakingchamber

Breakingchamber

Mobile contact

Fixed contact

Piston

Short-circuit current

Breaking chamber

Arc

Arc

New breaking technology roto-active breaking pressure (“reflex” tripping)

E62

670

E62

669

Fixed contact

Breakingenclosure

Breakingchamber

Breakingchamber

Mobile contact

Fixed contact

Piston


Breaking chamberBreaking chamber


Provides an exceptional limiting capacity

Fixed contact

Breakingenclosure

Breakingchamber

Breakingchamber

Mobile contact

Fixed contact

E62

670

E62

669

Piston

Compact NS power distribution


Icu and Ics performance

Category A Category B

L

H

N

150

100 160 250

70

3636

1600b 2000 2500 3200

85

70

630b 800 1000 1250 1600

50

70

150

Icu (kA) 380 / 415 V

400 630

50

150

70

100 %

Ics performance as Icu %

100 %

100 %

100 %

100 %

100 %

100 %

50 %

75 %

75 %

100 %


The protection trip units

STR 43 ME, STR 53 UE electronic

DC specific

Micrologic units

NS 100 to 250 NS 400 to 630

STR 22 SE,STR 22 ME, STR 22 GE

electronic

TM thermal magnetic STR 23 electronic

NS 1600b to 3200NS 630b to 1600


Auxiliaries and accessories NS 100 to 630

Electrical auxiliaries Auxiliary contacts Rotary handle

Motor mechanism Locking Connection Measurement module


NS 630b to NS 3200: Extension to the existing Compact NS range

2P/3P/4P, Fixed / withdrawable up to 1600 A manual operation remote control up to 1600 A

Compact NS up to 3200ACompact NS up to 1600A


315

1403P : 2104P : 280 160

3P : 4204P : 535

350

Optimized dimensions fixed version

Compact NSup to 1600A

Compact NSup to 3200A


Auxiliaries and accessories NS 630b to 1600 A

Electrical auxiliaries Auxiliary contacts Rotary handle Spreader Lead-seal cover

Motor mechanism Locking Operation counter Connection


Auxiliaries and accessories NS 1600b to 3200 A

Electrical auxiliaries Auxiliary contacts Locking Connection

Compact NS vid


Agenda

MCCB offer• Easypact

• Compact NS

ACB offer

• Masterpact NT

• Masterpact NW


Masterpact NTup to 1600A

Masterpact NWup to 6300A

479

395 3P : 786 4P : 1016

Masterpact NWup to 4000A

439322

3P : 288 4P : 358

278 3953P : 4414P : 556

439

The smallest in the world

Masterpact…The New Air ciruit breaker

4000 Arating

2 families, 3 sizes


Masterpact NT: Icu & Icw performance

L1

H1

630 800 1000 1250 1600

42

150

Icu (kA) 220 / 415 V

2 levels of performance for each

L1

H1

630 800 1000 1250 1600

42

10

Icw (kA) / 0.5 s


Masterpact NW: Icu performance

H2 100

800

H1

N1

1000 1250 1600 2000 3200 4000 5000 6300

65

42

100

150

Icu (kA) 220 / 415 V

H3

L1

150

150

2500

5 levels of performance


Reduced number of Spare parts

296 69 réf.

Aux. Switches

Coils

Motor mechanism

Control units

Accessories for

connection

C801/1251, CMMasterpact M

Compact NS 630b – 3200Masterpact NT - NW

15 réf. 3 réf.

130 réf. 17 réf.

58 réf. 16 réf.

33 réf. 13 réf.

60 réf. 20 réf.


Total discrimination with all MG circuit breakers

Multi 9

NS 160

NS - NT 800

NT - NW 1600

NS 400

NS 100

NS 250

NS 630

NS 1250

Increased continuity of supply

2 to 2.5 ratio between ratings


Innovations

Metallic filters

Current sensors

Connectors

Trip unit


Metallic filters on Masterpact NT and NW

Merlin Gerin solutions :

High technology 3 D metallic material

6 different materials have been intensively tested

Reduction of the safety perimeters to nearly zero (no

or very few ionized gas outside the arc chutes)

Problems of breaking a high current :

High temperature ionized gas (4000°C to 12 000°C) burning particles projections Installation constraints


Existing technology

Advantages Drawbacks

Iron CT Enough power to supply the Trip Unit

One CT for every rating due to high saturation Measurement is not accurate

Rogowski toroid Air CT

Unlimited range of measurement High accuracy

Very low power delivered, not able to supply the control unit

Current sensors …(existing solutions)

Functions: 1- Supply the control units 2- Current measurement


Dual air/iron sensors

Reduced number of the sensors (one fits all ratings from 400 to

3200A)

Current sensors …( Merlin Gerin solution )


Merlin Gerin universal connectors … A new concept

Complete unit = Unit without terminal + connector kit

Field installation Flexibility right on time of the installation

front

rear : horizontal or vertical with 2 position terminal

mixed


Zero safety perimeter

H3 : High discrimationIcu =IcsIcw =65kA

High performance : 150kA at 440V

High endurance : up to10 000 electrical cycles without maintenance

Masterpact… a differentiated Air circuit breaker

Safety of racking operation :positive stop in the 3 positions

Masterpact vid

Full rating up to 50°C rear vertical

50°C


Micrologic : a new range of intelligent control units

Microprocessor based Levels of protection

LI, LSI, LSIG,LSIV Types of metering

A (current), P (power), H (harmonics)

Functions : Load protection network measurement network monitoring

With communication capability


A comphehensive range of control units

Micrologic 2. 0 A

type of measurement versiontype of current protection

Types of current protection

2: Distribution L, I

5: Selective L, S, I

6: Selective and ground-fault protection L, S, I, G

7: Selective with earth-leakage protection L, S, I, V

Types of measurements

W/O A P H

2.0 2.0 A

5.0 5.0 A 5.0 P 5.0 H

6.0 A 6.0 P 6.0 H

7.0 A 7.0 P 7.0 H


Standard characteristics for the whole range

Control unit interchangeable on site

Sealable front cover

Test socket

pre-trip alarm

Micrologic vid

Standard for MCCB Standard for ACB


Questions?!

MCCB & ACB

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