Main Switchboards (MSBs)

Main Switchboards

A main switchboard is a large electrical switchboard that connects to the grid and distributes power to other smaller switchboards on the site. It normally includes a electricity retailer section where the metering is held. It is the central point where electrical power is received from the utility company and then distributed to various circuits and electrical loads throughout the building.

Main switchboards must be built to a verified design following AS/NZS 61439. This involves short cirtuit testing, temperature rise testing, voltage frequency withstand testing and various other verification requirements.

Electrical Engineering and Manufacturing

Why our Main Switchboards?

AS/NZS 61439 Compliant
Our main switchboards have been tested to be compliant with AS/NZS 61439. We have verified various designs at both PLUS ES in Lane Cove and TUV in Heidleberg.
Thousands of Switchboards Manufactured
Our manufacturing team has extensive experience and has worked on thousands of projects across Australia.
Trusted by Industry
With extensive experience, comes reliability. We are trusted by many major organisations across Australia as a safe pair of hands for their switchboard manufacturing requirements.

Main Switchboard Components

Key features of a main switchboard typically include:

Main Switch or Circuit Breaker – This is the primary disconnect switch or circuit breaker that allows the entire electrical supply to be shut off in case of emergency or maintenance. This is sometimes also refered to as an SPD (Service Protection Device) depending on the Australian state.

Busbars – Busbars are thick bars or conductors that carry the electrical current from the main switch to various circuit breakers or distribution points.

Circuit Breakers – These are devices that protect individual circuits from overloads or faults. They can be controlled manually or automatically and are used to isolate specific areas of the electrical system.

Meters and Monitoring Equipment – Some main switchboards include meters and monitoring equipment to measure electrical consumption and monitor the health of the electrical system.

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What Our Clients Say


This company is excellent. We go to them first for Grid Protection Units. They offer great value especially when you add their top notch customer service. As usual, we needed something STAT this week and the team didn't leave us hanging, even finishing it up and testing on a Saturday to meet our timetable. Graham Dennis shout out.
Mark Horsfall (Simmark)

CTC has always provided great service on the many occasions we have worked with them on our solar projects. They are reliable, responsive, and overall an excellent company.
Daphne from The Greenguys Group

Big fan of these guys - always answer the phone. They helped me out when Endeavour Energy required a neutral voltage displacement protection function on the solar installation
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