Technical FAQs 4

What is the difference between a main switch and a circuit breaker?

A main switch (or isolator) is designed purely to switch power on and off manually—it does not provide overcurrent protection. A circuit breaker automatically trips during overload or fault conditions to protect circuits. Main switches are used for isolation during maintenance and servicing, allowing electricians to safely de-energise circuits.

What is a circuit breaker used for?

A circuit breaker automatically trips during overload or fault conditions to protect circuits. Main switches are used for isolation during maintenance and servicing, allowing electricians to safely de-energise circuits. Circuit breakers protect against electrical faults but aren't designed for frequent switching operations.

What is a main switch?

Main switches are electrical isolator devices that disconnect entire installations or circuits from power supply. Available in 80A-100A ratings with single-pole, double-pole, or three-pole configurations, they enable safe maintenance isolation, emergency disconnection, and comply with AS/NZS 3000:2018 Australian standards.

What type of Breaker is a sbr190?

Hager SBR190 100 Amp single pole circuit breaker style main switch. This product meets all relevant Australian standards. 2 Years warranty. All... Hager SBR364 3 pole 63 amp main switch. Din rail mounted circuit breaker style. This product meets all relevant Australian standards. 2 Years... ABB E203100RD 3 Pole 100 amp main switch.

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