What is icu in circuit breaker

In the context of circuit breakers, ICU stands for "Instantaneous Current Unit". It's a critical component that measures the current flowing through the circuit and helps the circuit breaker to trip (open) in case of an overload or fault.

Here's how it works:

1. The ICU is connected in series with the circuit and measures the current flowing through it.
2. The ICU converts the measured current into a voltage signal, which is then sent to the circuit breaker's control unit.
3. The control unit analyzes the voltage signal and compares it to a set threshold (usually a predetermined current value).
4. If the measured current exceeds the threshold, the control unit sends a signal to the circuit breaker to trip (open) the circuit.

The ICU is designed to respond quickly to changes in current, typically within a few milliseconds. This fast response time helps to prevent damage to the circuit and equipment by quickly disconnecting the power supply in case of an overload or fault.

In summary, the ICU is a critical component of a circuit breaker that measures the current flowing through the circuit and helps to trip the circuit breaker in case of an overload or fault, ensuring the safety and reliability of the electrical system.