Circuit Breakers

High‑performance, reliable switching solutions for modern power systems

Switchgear circuit breakers are essential components in high-voltage designed to interrupt fault currents and protect electrical equipment.

Available in Live Tank and Dead Tank designs, these breakers ensure safe and efficient operation across transmission and distribution networks.

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Application Overview

The high‑voltage circuit breaker portfolio (40.5kV–500kV) is designed for use in power stations, substations, transmission networks, rail systems, industrial facilities, mining operations, and extreme‑climate environments. These breakers provide safe, reliable switching for:

Normal load current switching
Short‑circuit fault interruption
Back‑to‑back capacitor bank switching (C2 class)
No-load line and cable charging current switching
Reactive power compensation applications
Frequent operation scenarios
High‑altitude (up to 5000m) and high‑pollution environments (Class IV)

What We Solve For

The circuit breakers address critical challenges in electrical safety and system reliability. They prevent damage caused by overloads, short circuits, and unexpected electrical faults, protecting both equipment and people. By automatically interrupting excessive current flow, they reduce the risk of fires, costly downtime, and maintenance issues. Additionally, they help maintain stable operation across complex electrical networks, ensuring that power is delivered safely and consistently. In short, Insulect circuit breakers provide peace of mind by safeguarding electrical systems against common but potentially dangerous disruptions.

TECHNICAL

Features & Functionality

Functionality & Options

Interrupts high short‑circuit currents up to 31.5–63kA to protect system equipment.
Switches normal load currents across voltage levels from 40.5kV to 500kV.
Provides C2‑class switching for back‑to‑back capacitor banks and reactor circuits.
Breaks no‑load line and cable charging currents without restrikes for safe operation.
Supports frequent operation through robust spring mechanisms and long mechanical life.

Key Technical Specifications

Rated Voltage: 40.5kV / 72.5kV / 126kV / 145kV / 252kV
Rated Current: 2500A / 3150A / 4000A / 5000A
Short‑Circuit Breaking Current: 31.5kA / 40kA / 50kA / 63kA
Short‑Circuit Duration: 3–4 seconds
Insulation Levels: Power frequency: 95–552kV; Lightning impulse: 185–1260kV
Gas System: SF₆ pressure: 0.4–0.7 MPa depending on model

EXPERIENCE

Our Projects featuring Insulect Substations

Explore our project highlights to see where Insulect Substations are making an impact.
For tailored advice on whether this solution suits your network, please connect with our team here.

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Wunghnu Solar Farm

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Fortescue Aldoga, New 275kV Substation Switchgear

ADVANTAGES

Why Choose Insulect for Circuit Breakers

Combining high breaking performance, strong environmental adaptability, and long service life, these circuit breakers offer a robust, low‑maintenance solution for modern high‑voltage power systems.

Engineered for High‑Performance Switching

The circuit breakers deliver strong breaking capability through advanced self‑energy arc‑extinguishing systems, ensuring stable interruption of short‑circuit currents up to 63 kA and reliable handling of load, capacitor, and line‑charging operations.

Reliable in Demanding Environments

Optimized insulation, low SF₆ leakage rates, and durable materials enable dependable operation in high‑altitude regions, heavy‑pollution areas, and extreme temperature conditions.

Low Maintenance and Long Service Life

Simplified structures, corrosion‑resistant components, and mechanical endurance up to 10,000 operations support long‑term, low‑maintenance performance even under frequent switching.

IMPLEMENTATION

Services & Support

Insulect offers comprehensive services and support for the products we manufacture and specialise in, enhancing value for local utilities, major energy users, equipment manufacturers, and service operators.

LOCAL TECHNICAL TEAM

Our local technical team provides exceptional support and expertise, ensuring quick response times and personalised service to tackle any challenges that may arise during project execution.

ENGINEERING DESIGN

Our team utilises advanced technology and industry knowledge to develop innovative and efficient high-voltage switchgear solutions, customised to fit the unique requirements of each project.

PROCUREMENT & LOGISTICS

We facilitate smooth procurement and logistics processes by sourcing from trusted, proven partners and coordinating timely deliveries, ensuring projects remain on schedule and within budget.

TESTING & COMMISSIONING

Professional testing and commissioning support ensure that every high-voltage switchgear system functions safely and reliably, adhering to all regulatory standards and client expectations.

TURNKEY PROJECT DELIVERY

We are able to oversee every phase from concept to completion, providing comprehensive solutions that simplify complex projects and ensure successful outcomes.

FACTORY VISITS

We facilitate client visits to our local manufacturing sites here in Australia, as well as overseas, for initial inspection as well as factory acceptance testing.