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WNbreak MCCBsi

Quick Selection Table 50AF to 1200AF

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Controls & Switchgear

INDIA


INDIA

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CS3B3

IS 13947-2

IEC 60947-2


INDIA

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CS3B3

IS 13947-2

IEC 60947-2


INDIA

WiNbreak

CS3B3

IS 13947-2

IEC 60947-2

Frame type CS1A CS2A CS7B(electronic trip)Breaking capacity(kA), Icu at 415VAC 5 10 25 35 18 25 35 25 35 50 85 35 50 85 65 65Number of poles 2, 3 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 2, 3, 4 3, 4 3Type 2 pole CS1A2 CS2A2 CS2B2 CS2C2 CS3A2 CS3B2 CS3C2 CS4A2 CS4B2 CS4C2 CS4D2 CS5A2 CS5B2 CS5D2

3 pole CS1A3 CS2A3 CS2B3 CS2C3 CS3A3 CS3B3 CS3C3 CS4A3 CS4B3 CS4C3 CS4D3 CS5A3 CS5B3 CS5D3 CS7B3E4pole - CS2A4 CS2B4 CS2C4 CS3A4 CS3B4 CS3C4 CS4A4 CS4B4 CS4C4 CS4D4 CS5A4 CS5B4 CS5D4 -

Rated current (A) 5, 10, 15, 5, 10, 15 1200oIn at 50 C 20, 30, 20, 30, Electronically adjustable:

40, 50 40, 50, (0.5-0.6-0.7-60, 75, 0.8-0.9-1.0) x In

100Technical data conforming to IEC/EN60947-2/IS13947-2Rated operational voltage(V), Ue(50/60Hz) 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600Rated operational voltage(V), Ue(DC) 250 250 250 250 250 250 250 250 250 250 250 250 250 250 250 250Rated insulation voltage(V), Ui(50/60Hz) 690 690 690 690 690 690 690 690 690 690 690 690 690 690 690 690Rated impulse withstand voltage(kV), Uimp 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8Ultimate breaking capacity(kA), Icu

AC 50/60Hz 220/240V 10 25 50 65 35 50 65 35 50 85 125 50 100 125 100 100380V 7.5 14 25 35 18 25 35 30 42 65 100 42 65 100 65 65415V 5 10 25 35 18 25 35 25 35 50 85/50(Ics) 35 50 85/50(Ics) 65 65440/460V 5 10 25 35 18 25 35 25 35 50 85 35 50 85 65 65480/500V 2.5 7.5 14 25 10 14 25 18 25 35 65 25 45 65 50 50600V 2.5 5 10 18 7.5 10 18 18 22 25 30 22 25 30 45 45

DC 125V 5 10 20 25 15 20 25 20 30 50 60 30 50 60 - -250V 2.5 5 14 18 10 14 18 10 20 40 40 20 40 40 40 -

Service breaking capacity(% Icu), Ics 50 50 50 50 50 50 50 100 100 50 50 100 50 50 50 50Category of use A A A A A A A A A A A A A A A AEndurance Mechanical 20000 20000 30000 30000 20000 20000 20000 10000 10000 10000 10000 4000 4000 4000 2500 2500(number of operations) Electrical 20000 20000 20000 20000 10000 10000 10000 5000 5000 5000 5000 2500 2500 2500 500 500Type of trip unitThermal- magnetic release fixed fixed fixed fixed fixed fixed fixed fixed fixed fixed fixed fixedHydraulic - magnetic release fixed fixedMagnetic release only without thermal tripEarth leakage protection �

AccessoriesElectrical auxiliaries Auxiliary switch l

Alarm switch l l l l l l l l l l l l l l l lShunt trip l l l l l l l l l l l l l l l l

Undervoltage trip l l l l l l l l l l l l l l l l

External accessories Direct rotary handle l l l l l l l l l l l l l l - -

Extended rotary handle l l l l l l l l l l l l l l - -Terminal shield l l l l l l l l l l l l l l - -Insulation barrier l l l l l l l l l l l l l l l lRear connection l l l l l l l l l l l l l l l lMechanical interlock - - - - - - - l l l l l l l - -Plug-in device (3 pole) l l l l l l l l l l l l l l - -

Dimensions (W x H x Dmm) 3 pole breakerWeight(kg) 2 pole 0.45 0.45 0.7 0.7 1.1 1.1 1.1 5.2 5.2 5.2 5.2 11 11 11 - -

3pole 0.65 0.65 1.1 1.1 1.2 1.2 1.2 6.2 6.2 6.2 6.2 11.5 11.5 11.5 19.4 19.44pole 0.85 1.2 1.2 1.5 1.5 1.5 7.8 7.8 7.8 7.8 18.2 18.2 18.2 27 -

Frame Size(AF) 50 100 225 400 800 1200

CS2B CS2C CS3A CS3B CS3C CS4A CS4B CS4C CS4D CS5A CS5B CS5D CS6B

� �

�� l

l l l l l l l l l l l l l l l

15, 20, 30, 4050, 60, 75,

100

75 x 130 x 60 90 x 155 x 60 105 x 165 x 60 140 x 257 x 113 210 x 280 x 113 210 x 400 x 105

125, 150, 175, 200, 225 250, 300, 350, 400Interchangeable via rating plug between

250 and 300350 and 400

CS6B3CS6B41000

CS7B3CS7B41200500, 600, 630, 700, 800

Interchangeable via rating plug between

500 and 600, 500 and630, 700 and 800

Fixed-thermal, Adjustable-magnetic Adjustable-thermal, Adjustable-magnetic

* Note) 1.l Available as optional2.� Available as a separate breaker

11 12

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Quick Selection Table

Frame type CS1D CS2D CS3D

Breaking capacity(KA), Icu at415Vac 65 65 65

Number of pole 3, 4, 3, 4, 3,4,

Type 3 pole CS1D3 CS2D3 CS3D3

4pole CS1D4 CS2D4 CS3D4

Rated current (A) 15, 20, 30, 40, 50 60, 75, 100 125, 150 oIn at 50 C 175, 200, 225

Technical data conforming to IEC/EN60947-2Rated operational voltage(V), Ue(50/60Hz) 600 600 600

Rated operational voltage(V), Ue(DC) 250 250 250

Rated insulation voltage(V), Ui(50/60Hz) 660 660 660

Rated impulse withstand voltage(kV), Uimp 8 8 8

Ultimate breaking capacity(kA), Icu

AC 50/60Hz 220/240V 100 100 125

380/415V 65 65 65

440/460V 65 65 65

480/500V 42 50/4 50/42

600V 35 35 35

DC 125V 60 60 60

250V 40 40 40

Service breaking capacity(% Icu), Ics 50 50 50Category of use A A A

Endurance Mechanical 8500 8500 7000(number of operations) Electrical 1500 1500 1000

Type of trip unit

Thermal- magnetic release fixed fixed fixed

Accessories

Electrical auxiliaries Auxiliary switch l

Alarm switch l l l

Shunt release l l l

Undervoltage release l l l

External accessories Direct rotary handle l l l

Terminal shield l l l

Insulation barrier l l l

Motor operator - - -

Dimensions (W x H x D mm) 3 pole breaker 105 x 165 x 99

Weight(kg) 2 pole 1 1 2.1

3pole 1.7 1.7 2.3

4pole 2.3 2.3 2.5

Frame Size(AF) 50 100 225

l l

High Breaking Capacity RangeProtective CoordinationThe primary purpose of a circuit protection system is to prevent damage to series connected equipment and to minimize the area and duration of power loss.The first consideration is whether an air circuit breaker or molded case circuit breaker is most suitable. The next is the type of system to be used.The two major types are : Discrimination and cascading.

Type of protective coordination1. DiscriminationObject : Continuity of service

2. Cascading

Object : Economical use of MCCBs

Discrimination, also called selectivity, is the coordination of automatic protection devices in such a manner that a fault appearing at a given point in a network is cleared by the protection device installed immediately upstream of the fault, and by that device alone.

Cascading is the use of the current limiting capacity if circuit breakers at a given point to permit installation of lower-rated and therefore lower-cost circuit breakers branch. The main circuit breakers acts as a barrier against short-circuit currents. In this way, branch circuit breakers with lower breaking capacities than the prospective short-circuit (at their point of installation) operate under their normal breaking conditions. Since the current is limited throughout the circuit controlled by the limiting circuit breaker, cascading applies to all switchgear branch.

Protection discrimination & Cascading

Technical Information50AF to 225AF

Controls & SwitchgearINDIA

IS 13947-2IEC 60947-2

Controls & SwitchgearINDIA

IS 13947-2IEC 60947-2

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CS3B3

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CS3B3

105 x 165 x 82

13 14

CS2 CS3 CS4

A3 A3 A3 A3 B3 B3 B3 B3 C3 C3 D3 D3 D3 D3 B3E

ICU (kA) 25 35 35 50 50 50 50 100 35 85 100 125 125 125 100

CS1A3 10 0.8 1.8 4.1 10.0 0.8 1.8 10.0 0.8 4.1 0.9 1.8 4.1 10.0 10.0

CS2A3 25 - 1.8 4.1 15.0 - 1.8 4.1 15.0 1.8 4.1 - 1.8 4.1 15.0 13.2

CS3A3 35 - - 3.6 10.3 - - 3.6 10.3 - 3.6 - - 3.6 10.3 35.0

CS4A3 35 - - - 8.9 - - - 8.9 - - - - - 8.9 26.5

CS2B3 50 - 108 4.4 15.8 - 1.8 4.4 15.8 1.8 4.4 - 1.8 4.4 15.8 50.0

CS3B3 50 - - 3.6 10.3 - - 3.6 10.3 - 3.6 - - 3.6 10.3 37.5

CS4B3 50 - - - 8.9 - - - 8.9 - - - - - 8.9 26.5

CS2C3 65 - 1.8 4.4 15.8 - 1.8 4.4 15.8 1.8 4.4 - 1.8 4.4 15.8 65

CS3C3 65 - - 3.6 10.3 - - 3.6 10.3 - 3.6 - - 3.6 10.3 37.5

CS4C3 85 - - - 8.9 - - - 8.9 - - - - - 8.9 26.5

CS1D3 100 0.8 1.8 3.6 15.2 0.8 1.8 3.6 15.2 1.8 3.6 0.9 1.8 3.6 15.2 100.0

CS2D3 100 - 1.8 3.6 15.2 - 1.8 3.6 15.2 1.8 3.6 - 1.8 3.6 15.2 100.0

CS3D3 125 - - 3.6 11.9 - - 3.6 11.9 - 3.6 - - 3.6 11.9 59.8

CS4D3 125 - - - 8.9 - - - 8.9 - - - - - 8.9 26.5

CS5 CS2 CS3 CS4 CS5 CS3 CS4 CS2 CS3 CS4 CS5 CS7

A3 A3 A3 A3 B3 B3 B3 B3 C3 C3 D3 D3 D3 D3 B3E

ICU (kA) 10 18 25 35 25 25 35 50 35 50 65 65 85 85 65

CS1A3 5 0.8 1.8 3.9 5.0 0.8 1.8 3.9 5.0 1.8 3.9 0.9 1.8 3.9 5.0 5.0

CS2A3 10 - 1.8 3.9 10.0 - 1.8 3.9 10.0 1.8 3.9 - 1.8 3.9 10.0 10.0

CS3A3 18 - - 3.6 8.8 - - 3.6 8.8 - 3.6 - - 3.6 8.8 18.0

CS4A3 25 - - - 8.4 - - - 8.4 - - - - - 8.4 21.7

CS2B3 25 - 1.8 4.0 10.9 - 1.8 4.0 10.9 1.8 4.0 - 1.8 4.0 10.9 21.7

CS3B3 25 - - 3.6 8.8 - - 3.6 8.8 - 3.6 - - 3.6 8.8 25.0

CS4B3 35 - - - 8.4 - - - 8.4 - - - - - 8.4 21.7

CS2C3 35 - 1.8 4.0 10.9 - 1.8 4.0 10.9 1.8 4.0 - 1.8 4.0 10.9 35.0

CS3C3 35 - - 3.6 8.8 - - 3.6 8.8 - 3.6 - - 3.6 8.8 25.4

CS4C3 50 - - - 8.4 - - - 8.4 - - - - - 8.4 21.7

CS1D3 65 0.8 1.8 3.6 11.5 0.8 1.8 3.6 11.5 1.8 3.6 0.9 1.8 3.6 11.5 55.2

CS2D3 65 - 1.8 3.6 11.5 - 1.8 3.6 11.5 1.8 3.6 - 1.8 3.6 11.5 55.2

CS3D3 65 - - 3.6 9.6 - - 3.6 9.6 - 3.6 - - 3.6 9.6 31.7

CS4D3 85 - - - 8.4 - - - 8.4 - - - - - 8.4 21.7

CS2 CS3 CS4 CS5 CS2 CS3 CS4 CS5 CS3 CS4 CS2 CS3 CS4 CS5 CS7

CSSeries

CS Series

CS Series

CS Series

CS Series

CSSeries

AC 240V

AC 415V

Main breaker

Branch breaker

Main breaker

Branch breaker

Protection discrimination

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Technical Information MCCB-MCCB

15 16

A3 A3 A3 A3 B3 B3 B3 B3 C3 C3 D3 D3 D3 D3

ICU (kA) 25 35 35 50 50 50 50 100 65 85 100 125 125 125

CS1A3 10 25 30 30 - 35 35 35 - 42 50 50 85 85 -

CS2A3 25 - 35 35 42 42 42 42 65 50 65 65 85 85 85

CS3A3 35 - - - 50 - 50 50 65 65 65 - 85 85 85

CS4A3 35 - - - 50 - - 50 65 - 65 - - 85 85

CS2B3 50 - - - - - - - 85 65 85 100 100 100 100

CS3B3 50 - - - - - - - 85 65 85 - 100 100 100

CS4B3 50 - - - - - - - 85 - 85 - - 100 100

CS2C3 65 - - - - - - - 100 50 85 100 125 125 125

CS3C3 65 - - - - - - - 100 65 85 - 125 125 -

CS4C3 85 - - - - - - - 100 - - - - - 125

CS1D3 100 - - - - - - - - - - - 125 125 125

CS2D3 125 - - - - - - - - - - - - - -

CS3D3 125 - - - - - - - - - - - - - -

CS4D3 125 - - - - - - - - - - - - - -

CS2 CS3 CS4 CS5 CS2 CS3 CS4 CS5 CS3 CS4 CS2 CS3 CS4 CS5

A3 A3 A3 A3 B3 B3 B3 B3 C3 C3 D3 D3 D3 D3

ICU (kA) 10 18 25 35 25 25 35 50 35 50 65 65 85 85

CS1A3 5 10 7.5 7.5 - 22 10 10 - 14 14 35 25 18 -

CS2A3 10 - 14 14 14 18 18 18 25 18 25 35 35 30 30

CS3A3 18 - - 25 30 - 25 30 35 30 35 - 50 42 42

CS4A3 25 - - - 35 - - 35 42 - 42 - - 42 42

CS2B3 25 - - - 35 - - 35 42 35 42 50 50 50 50

CS3B3 25 - - - 35 - - 35 42 35 42 - 65 50 50

CS4B3 35 - - - - - - - 50 - 50 - - 65 65

CS2C3 35 - - - - - - - 50 - 50 65 65 65 65

CS3C3 35 - - - - - - - 50 - 50 - 65 65 65

CS4C3 50 - - - - - - - - - - - - 85 85

CS1D3 65 - - - - - - - - - - - - 85 85

CS2D3 65 - - - - - - - - - - - - 85 85

CS3D3 65 - - - - - - - - - - - - 85 85

CS4D3 85 - - - - - - - - - - - - - -

CS2 CS3 CS4 CS5 CS2 CS3 CS4 CS5 CS3 CS4 CS2 CS3 CS4 CS5

240V

415V

CSSeries

CSSeries

CS Series

Main breaker

Branch breaker

CS Series

CS Series

CS Series

Main breaker

Branch breaker

Cascading

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Technical Information MCCB-MCCB

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Technical Information

CS2A3 CS3A3, CS3B3, CS3C3 CS2B3, CS2C3

CS3A3, CS3B3, CS3C3 CS2B3, CS2C3CS2A3

AC 240V

AC 415V

AC 240V

AC 415V

Current limiting curves Current limiting curves

17 18

CS3D3 CS1D3, CS2D3

CS3D3 CS1D3, CS2D3

CS5A3, CS5B3, CS5D3

CS4A3, CS4B3, CS4C3, CS4D3

CS5A3, CS5B3, CS5D3


AC 415V AC 415V

AC 240V AC 240V

Current limiting curvesCurrent limiting curves

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Technical Information

Status of MCCB handleON

Type

AX

AL

OFF Tripped

AC

VoltageOperating current(A) Operating current(A)Voltage(V) (V)Resistance ResistanceInductance Inductance

DCSuitable for

MCCB

Electrical characteristics of auxiliary switch (AX) and alarm switch (AL)

Direct starters with moulded case circuit breakers (50kA-415V l IEC 60947)

Operating characteristics of AX and AL

AF

50AF~225AF

50AF~225AF

400AF~800AF

1000AF~1200AF

Motor RatingKW

IFL(A)

Contactor

Code Code CodeRating (A) Rating (A)Range (A)

Overload Relay MCCB

CS1A, CS2A, CS3A,CS2B, CS3B, CS2C, CS3C

Alarm switch (AL)When the circuit-breaker has tripped, It indicates the tripped status of thecircuit-breaker. (trip indication)

Auxiliary switch (AX)It can be used to check circuit-breaker status information on On/Off.It indicates the position of the circuit-breaker contacts.

CS1D, CS2D, CS3D

CS4A, CS5A, CS4B, CS5B, CS4C, CS4D, CS5D

CS6B, CS7BCS6D, CS7DCS7BE

125250500

202010

20205

30125250

60.40.2

50.050.03

30125250

40.40.2

30.40.2

30125250

40.40.2

30.40.2

53-

32-

53-

32-

125250500

125250500

0.75 2 TC1 ~ D09 9 D09307 1.60 ~ 2.50 CS1D3 15

1.1 2.5 TC1 ~ D18 18 TR2 ~ D09308 2.50 ~ 4.00 CS1D3 15

1.5 3.5 TC1 ~ D18 18 TR2 ~ D09308 2.50 ~ 4.00 CS1D3 15

2.2 5 TC1 ~ D25 25 TR2 ~ D09310 4.00 ~ 6.00 CS1D3 15

3 6.5 TC1 ~ D32 32 TR2 ~ D09312 5.50 ~ 8.00 CS1D3 15

4 8.4 TC1 ~ D32 32 TR2 ~ D09314 7.00 ~ 10.0 CS1D3 15

5.5 11 TC1 ~ D32 32 TR2 ~ D12316 9.00 ~ 13.0 CS1D3 15

7.5 14.8 TC1 ~ D32 32 TR2 ~ D18321 12.0 ~ 18.0 CS1D3 30

9 15.1 TC1 ~ D40 40 TR2 ~ D25322 17.0 ~ 25.0 CS1D3 30

10 19 TC1 ~ D40 40 TR2 ~ D25322 17.0 ~ 25.0 CS1D3 30

11 21 TC1 ~ D40 40 TR2 ~ D25322 17.0 ~ 25.0 CS1D3 30

15 28.5 TC1 ~ D50 50 TR2 ~ D40353 23.0 ~ 32.0 CS2D3 60

18.5 35 TC1 ~ D50 50 TR2 ~ D40355 30.0 ~ 40.0 CS2D3 60

22 42 TC1 ~ D50 50 TR2 ~ D65357 37.0 ~ 50.0 CS2D3 60

30 57 TC1 ~ D65 65 TR2 ~ D65359 48.0 ~ 65.0 CS2D3 100

37 66 TC1 ~ D80 80 TR2 ~ D80363 63.0 ~ 80.0 CS2D3 100

45 81 LC1 ~ F115A 115 LR1 ~ F(M)125 80 ~ 125 CS2D3 100

55 100 LC1 ~ F115A 115 LR1 ~ F(M)125 80 ~ 125 CS2D3 150

75 135 LC1 ~ F150A 150 LR1 ~ F160 100 ~ 160 CS2D3 150

90 155 LC1 ~ F185A 185 LR1 ~ F200 125 ~ 200 CS3D3 250

110 200 LC1 ~ F225A 225 LR1 ~ F250 160 ~ 250 CS4D3 250

132 230 LC1 ~ F265A 265 LR1 ~ F315 200 ~ 315 CS4D3 300

160 270 LC1 ~ F330A 320 LR1 ~ F400 250 ~ 100 CS4D3 350

200 361 LC1 ~ F400A 400 LR1 ~ F400 250 ~ 400 CS5D3 500

220 380 LC1 ~ F500A 500 LR1 ~ F500 315 ~ 500 CS5D3 500

250 430 LC1 ~ F500A 500 LR1 ~ F500 315 ~ 500 CS5D3 630

TR2 ~

Product innovation at TC is a continuous process; hence the data given is subject to change without notice.

Short circuit coordination Electrical Auxiliaries

Auxiliary switch, AX

Alarm switch, AL

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Technical Information Accessories

Electrical AuxiliariesElectrical Auxiliaries

Shunt trip coil (SHT) Terminal number

Electrical characteristics (Consumption)

This trip coil trips the circuit breaker when the control voltage exceeds from 0.85 times to 1.1times the rated voltage at AC and from 0.75 times to 1.25 times the rated voltage at DC.

Undervoltage trip (UVT)This trip coil trips the circuit breaker when the control voltage drops below the tripping threshold.- Tripping threshold between 0.2 and 0.7 times the rated voltage.- The circuit-breaker closing is possible only if the voltage exceeds 0.85 times the rated voltage (AC/DC)

AF

Way of connection

ControlVoltage(V)

ControlVoltage(V)

Terminal Number

MCCB (400AF~800AF) MCCB (1000AF~1200AF)MCCB (50AF~225AF)

Auxiliary switch(AX)

Alarm switch(AL)

Shunt trip coil(SHT)

Undervoltage

tripcoil

(UVT)

AC

DC

Consumption(A)

Consumption(A)

Consumption(W)

Consumption(W)AF

30~225AF 400~800AF

Shunt Trip, SHT

Under Voltage Trip, UVT

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CS1A2, CS2A2, CS2A4

CS1A3, CS2A3

CS2B2, CS2C2

CS2B3, CS2C3

Direct(D)

CS2B4, CS2C4

CS3A2, CS3B2, CS3C2CS3A3, CS3B3, CS3C3

CS4A2, CS4B2, CS4C2, CS4D2CS4A3, CS4B3, CS4C3, CS4D3

CS5A2, CS5B2, CS5D2CS5A2, CS5B2, CS5D2CS5A3, CS5B3, CS5D3CS5A4, CS5B4, CS5D4


CS3A4, CS3B4, CS3C4

CS3D2, CS3D3

CS3D4

CS1D3, CS2D3

CS1D4, CS2D4

Extended(E)

Type

Long Type Short TypeApplied MCCBs

Dimension(mm)

A CB(B’)

CS1A3CS2A3

(D-35~55)

(N-30b, 40b, 55b, N-55, N-60)

(N-70, N-80)

CS2B3, CS2B4CS2C3, CS2C4

CS3A2, CS3A3, CS3A4CS3B2, CS3B3, CS3B4CS3C2, CS3C3, CS3C4

CS1D3, CS1D4CS2D3, CS2D4

CS3D3

CS4A2, CS4B2, CS4B3, CS4B4CS4C2, CS4C3, CS4C4CS4D2, CS4D3, CS4D4

CS4A3, CS4A4

CS5A2, CS5B2, CS5B3, CS5B4CS5D2, CS5D3, CS5D4

CS5A3, CS5A4

Terminal Cover Rotary Handle

Type of rotary handleMCCB

Mounting direction

N-70M-S

N-70-S

N-60-S

N-55-S

D-55-S

D-45-S

D-35-S

E-55-S

E-45-S

E-35-S

N-70M-L

N-70-L

N-60-L

N-55-L

D-55-L

D-45-L

D-35-L

E-55-L

E-45-L

E-35-L

N-70M-R

N-70-R

N-60-R

N-55-R

D-55-R

TBL-12B TBS-12BTBL-13B TBS-13BTBL-22B TBS-22BTBL-23B TBS-23B

TBL-24B TBS-24B

TBL-33B TBS-33B

TBL-34B TBS-34BTBL-43BTBL-44B

TBL-54B

T1-43A

T1-44A

T1-63A

T1-64A

TBL-53B

D-45-R

D-35-R

E-55-R

E-45-R

E-35-R

E-70MU

E-70U

These are insulating accessories used for protection against direct contact withpower circuits and for protection against insert of a foreign body (a piece of dirt).

25 26

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