Altech circuit breaker performance curves

Circuit Breaker Trip Curve Selection Guide and Ordering Tables

Warning!
This information should only be used as a selection guide. The use of a Circuit Breaker in an application with a certain Trip-Characteristic always requires prototype testing! It is the responsibility of the circuit design engineer to select the appropriate Circuit Breaker for his specific application.

Part One

Applications

Trip-Characteristics*

Characteristic Trip Boundaries
Thermal Trip		Magnetic Trip
Must not Trip>1hr	Must Trip <1hr	Must not Trip >100ms	Must Trip at 100ms

Lighting

Wiring Protection

Business Equipment

Appliances

Control Circuits

Transformers

Power Supplies

B-Characteristic **

1.13xRC

1.45xRC

3xRC

5xRC

+

C-Characteristic **

1.13xRC

1.45xRC

5xRC

10xRC

+

D-Characteristic **

1.13xRC

1.45xRC

10xRC

16xRC

+

E-Characteristic **

1.05xRC

1.35xRC

14xRC

18xRC

G-Characteristic **

1.05xRC

1.35xRC

8xRC

10xRC

+

Z-Characteristic **

1.05xRC

1.35xRC

2xRC

3xRC

*The values of each characteristic are shown vertically beneath it's corresponding heading. ** Click for PDF file.

**Time** **Versus** **Current** **Trip Curve**
	Altech short form with ordering information: Click any of the following to download as a PDF* file viewable in your browser or to print. B Trip Characteristics (2 pages, 120K) C Trip Characteristics (2 pages, 190K) D Trip Characteristics (2 pages, 204K) E Trip Characteristics (2 pages, 204K) G Trip Characteristics (2 pages, 218K) Z Trip Characteristics (2 pages, 192K) Other appropriate information (6 pages, 296K) Information is a PDF file containing: Trip Curve Seletion Guide Horsepower Rating Tables V-EA Internal Resistance Line Current Frequency Effects on Trip Curve V-EA Dimensions Nonmetallic Enclosure for MCB's Temperature Effects on Trip Curves Installation Recommendations

Part Two

Applications

Trip-Characteristics*

Characteristic Trip Boundaries
Thermal Trip		Magnetic Trip
Must not Trip>1hr	Must Trip <1hr	Must not Trip >100ms	Must Trip at 100ms

Motors

Heaters

General

Low
Inrush

High
Inrush

High
Efficiency

General Electronics

Solenoid

Semi- conductors

Components/ devices with low surge- current and short circuit withstand capabilities

Reactive Load

B-Characteristic **

1.13xRC

1.45xRC

3xRC

5xRC

+

C-Characteristic **

1.13xRC

1.45xRC

5xRC

10xRC

+

D-Characteristic **

1.13xRC

1.45xRC

10xRC

16xRC

+

E-Characteristic **

1.05xRC

1.35xRC

14xRC

18xRC

+

G-Characteristic **

1.05xRC

1.35xRC

8xRC

10xRC

+

Z-Characteristic **

1.05xRC

1.35xRC

2xRC

3xRC

+

*The values of each characteristic are shown vertically beneath it's corresponding heading. ** Click for PDF file.