What is an ACB used for and at what amp/voltage ranges?

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Detailed Solution

An Air Circuit Breaker (ACB) is a robust electrical protection and switching device primarily used in large-scale, low-voltage (LV) power distribution systems.

Its main purpose is to serve as the main incoming circuit breaker for an entire facility, such as a factory, a large commercial building, a data center, or a hospital. It protects the entire downstream electrical installation from damage caused by overloads, short circuits, and earth faults.

Primary Functions:
1. Protection: It automatically trips (opens the circuit) when it detects a fault, preventing fires and equipment damage.
2. Switching: It can be used to manually or remotely switch the power on or off for the entire installation for operational or maintenance purposes.
Voltage and Current Ranges:
- Voltage: ACBs are exclusively used in Low Voltage (LV) systems, typically up to 690V AC, with the most common application being at 415V.
- Current (Amps): They are designed for very high current applications, with standard ratings ranging from 400A to 6300A.