7/31/2019 Air Circuit Breakers - B Type

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Air Circuit Breaker

IS: 8828

We touch your everyday!electricity 

 ACB-B Type

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 Technical Overview

High Breaking & Short Time Withstand Capacity

Full utilization of electromagnetic repulsive force

Even though it is sound and compact in design, it provides high

breaking capacity and short - time withstand current capacity by fully

utilizing electromagnetic repulsive force.

The contact spring normally provides an adequate contact

pressure.

 A large current flow causes an electromagnetic repulsive force

between the contact lead halves.

This repulsive force works in a direction to turn the moving contact

clockwise about the contact shaft, giving it more contact pressure.

Hence this unique design ensures a high short-time withstand

current capacity.

When interrupting a large current, the electromagnetic repulsive force

works in a direction to separate the moving contact from the

stationary contact.

 A separating force resulting from the electromagnetic repulsive force

adds to that by the trip spring, assisting a high-speed interruption.

This is why our design provides a high breaking capacity

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400~1600A in single frame size

Light & compact

High breaking capacity - 45/50kA

Reliable system protection thru:

a) Thermal Magnetic (TOMCR)

b) Microprocessor Release (mIT-100)

Fast acting mechanism (total breaking time less than 30ms including arcing time of less than 10ms) minimizes installation stress

under fault condition

Easy termination - horizontal Bus bar connection.

High mechanical & electrical life.

High dielectric strength due to use of class 'B' and 'F' insulating material ensures reliable performance in tropical conditions

Comply with utilization category B & pollution degree 3 group 1 of IEC60947-Part1

Tested for seismic conditions .

Wide range of accessories offered-Shunt trip, UVT, Auxiliary Switch, Trip indication switches to meet market specifications.

Salient Features

 Amperes Frame (based on IEC / IS) 400 630 800 1000 1250 1600

 Type (3 Poles) AH-4B AH-6B AH-8B AH-10B AH-12B AH-16B* *

Insulation Voltage Ui (V) AC 1000 1000 1000 1000 1000 1000

Impulse Voltage Uimp (V) AC (Peak) 8 8 8 8 8 8

Dielectric strength (for a minute) kV 3.5 3.5 3.5 3.5 3.5 3.5

Rated Making Capacity Icm (Peak) kA 105 105 105 105 105 105

Rated Breaking Capacity Icu=Ics (RMS) kA 415V AC 50 50 50 50 50 50

Short time withstand current Icw kA for 1 sec. RMS 50 50 50 50 50 50

Total breaking time/closing time (m.sec.) 30/40 30/40 30/40 30/40 30/40 30/40

Weight (kg) 40 40 40 42 42 44

Overall Dimension (H x W x D) (mm) 483 x 332 x 323

* 630A & 800A ACBs are also available in 45kA breaking capacity at 415V AC operating voltage & 690V insulation voltage.

 Technical Specifications

Contact Pressure by Repulsive Force

Contact Pressure by Contact Spring

Mechanical Retaining Force

Contact Spring

Current

Contact Lead

Stationary Contact

Moving Contact

Contact Shaft

Current

Electromagnetic

Repulsive Force

 Arc

Trip Spring

Separating Force Resulting from

Repulsive Force

Separating Force by Trip Spring

Contact Holder Shaft

Stationary Contact

Moving Contact

Current

Electromagnetic

Repulsive Force

7/31/2019 Air Circuit Breakers - B Type

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 A direct acting electromagnetic instantaneous trip

device with fixed current setting for Short Circuit

Protection.

CT actuated thermal Overload relay offers

Protection along with Shunt trip. Current setting are

60-100% or 80-120%.

O/L

Microprocessor Release

Salient Features

IT-100

supply for its basic function.

Error free and user friendly setting of current/time.

Provides highest degree of system protection coordination.

Self powered by built in current transformer.

No mal-operation due to external disturbances.

Built in operation check function.

 Visual fault discrimination by LEDs.

Three phase and earth fault in one single compact unit.

Self monitoring of trip unit with blinking indication.

Function Blocking facility provided.

is a true RMS sensing overcurrent trip device, requires no external

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Over Load Current (LTD)

LTD Current Setting range: 0.5, 0.55 ...1.15 In (in steps of 0.05)

LTD Time Setting range: 2.5, 5 ....... to 35 sec. (in steps of 2.5 sec.)

Short Circuit Current (STD)

STD Current Setting range: 4, 5 ... 10 In (in steps of 1)

STD Time Setting Range: 50, 100, ... 550 ms. (in steps of 50 ms)

Instantaneous Current (INS)

Current (INS) Setting Ranges: 4, 5, ... 11In (in steps of 1)

Ground Fault (GFT)

GFT Current Setting Range: 15, 20, ... 50% In (in steps of 5%)

GFT Time Setting Range: 50, 100, ... 550 ms (in steps of 50ms)

Function Blocking In normal running operation of unit, any of the four function

can be blocked by turning the DIP switches to ON position

 Thermal Magnetic Release

MAGNETIC INST. S/C TRIP

   T   I   M   E

40ms.

30ms.

Rated Current

% Rated Current of Base Current

Note: Applicable where rated current of

over current trip devices is not less than 250A

Current setting of non-adjustable magnetic instantaneous trip

 Applicable Breaker AH-6B

 AH-8B

 AH-10B

 AH-16B

 AH-12B

Tripping Characteristics

 Accuracy of Time & Current Setting ±20%Calibrated at40°C:

 Balanced (Cold Start)

------ Balanced (Hot Start)

   6   0

   7   0

   8   0

   1   0   0

   1   2   5

   1   5   0

   2   0   0

   2   5   0

   3   0   0

   4   0   0

   5   0   0

   6   0   0

   1   2   0

2

3

5.0

4.0

3.0

2.0

6.0

8.0

10

20

30

40

50

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5

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8

2050

1

4

   h  o  u  r

  m   i  n  u   t  e

      s      e      c      o      n        d

   8   0   %

   1   0   0   %

   1   2   0   %

Long Time Delay Trip

Current setting range

   O  p  e  r  a   t   i  n  g

   T   i  m  e

   1 .   0

   5

   1 .   3

Protection Release

 Tripping Characteristics

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+91-11- , +91-11-2684 8241, 2684 73423088 7520-29

222, Okhla Industrial Estate, New Delhi - 110 020

+91-11-4161 3503, 3088 7520-29, +91-11-2683 8291, 2684 7342

C&S Electric Ltd.

We touch your electricity everyday!

www.cselectric.co.in

Panel Cutout

 Air Circuit Breakers - B Series

151.5

166166

151.5

332

1515

Front View

Rear ViewSide View

Overall Dimensions (AH-4B~AH-16B)

   1   0   2   S   G   R   /   B   /   0   6

   2   0   1   1