Circuit Breakers Selective Coordination

2020-11-25
The following curve illustrates a typical thermal magnetic molded case circuit breaker curve with an overload region and an instantaneous trip region (two instantaneous trip settings are shown). Circuit breaker time-current characteristic curves are read similar to fuse curves. The horizontal axis represents the current, and the vertical axis represents the time at which the breaker interrupts the circuit.
When using molded case circuit breakers of this type, there are four basic curve considerations that must be understood. These are:
1. Overload Region
2. Instantaneous Region
3. Unlatching Time
4. Interrupting RatiNG

Eaton Bussmann

Circuit Breakers

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Supplier and Product Introduction

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2019/05/28

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