Surge Arrester for Spark-Free Protection in Distribution Networks

Robust Protection for High-Energy Overvoltage Events

Insulect’s Class A Surge Arresters are engineered to safeguard electrical infrastructure against high-energy overvoltage transients, such as those caused by direct lightning strikes. Designed for integration at the main distribution level, these arresters are ideal for environments with a high risk of lightning-induced surges.

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Made for Demanding Overvoltage Conditions.

Class A surge arresters are engineered for primary protection of high-voltage equipment in overhead distribution and substation networks. Designed to meet IEC 60099-4 standards, these arresters effectively protect assets from lightning strikes, switching surges, and temporary overvoltages. Ideal for critical infrastructure, rural feeders, and exposed overhead lines, Class A units are built for durability and performance in extreme environments.

Engineered for Safety in Fire-Prone Zones.

Our Class A arresters incorporate internal arc protection and spark-free operation, minimising risk to personnel and surrounding infrastructure. This makes them suitable for use in densely populated areas or bushfire-prone zones, where ignition risks must be mitigated. The non-gapped design ensures consistent energy absorption and safe pressure relief in the event of overload.

Reliable High Voltage Protection, Built to Standards.

Encased in lightweight, UV- and weather-resistant polymeric housings, Class A arresters deliver superior hydrophobicity and insulation performance over time. The slimline design makes them easier to install and maintain on existing structures while withstanding the harshest environmental conditions.

Reducing Risk. Enhancing Longevity.

Class A arresters solve for high-energy surge protection in mission-critical networks. Whether defending aging substation infrastructure or new renewable connections, they provide peace of mind through long-term reliability, reduced maintenance, and compliance with rigorous international standards. Built tough for Australian conditions, they help ensure continuity of supply and equipment lifespan.

TECHNICAL

Features & Functionality

Functionality & Options

Insulect Class A surge arresters are certified to AS 1307.2-1996 (R2015) for zero spark production—critical for installations in bushfire-prone environments.
Certified to AS 1307.2-1996 (R2015) for zero spark production, ideal for bushfire-prone and environmentally sensitive sites.
Constructed with polymer housing and a fibreglass core for easy handling and installation in tight or elevated spaces.
Designed to endure high-stress overvoltages during REFCL (Rapid Earth Fault Current Limiter) operation in Australian and New Zealand networks.
Fully encapsulated in HTV silicone rubber for long-term weather and pollution resistance.

Key Technical Specifications

Voltage Rating Range: 3 kV – 64 kV
Discharge Current Ratings: 5 kA or 10 kA
Arrester Class: Class A (Spark-Free)
Standards Compliance: AS 1307.2-1996 (R2015), IEC 60099-4:2004, ANSI/IEEE C62.11:2005
Housing Material: High-temperature vulcanised (HTV) silicone with fibreglass core
Application Environments: Suitable for indoor, outdoor, or high-risk bushfire zones.

EXPERIENCE

Our Projects Featuring Insulect Switchgear

Explore our project highlights to see where Insulect Switchgear is 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 Surge Arresters

Insulects surge arresters deliver proven performance in protecting medium voltage assets against lightning and switching overvoltage events. Whether you're operating in bushfire-prone zones or compact substations, our Class A spark-free and Class C polymeric designs are engineered for safety, durability, and ease of installation. Backed by compliance with IEC and AS standards, and trusted in networks across Australia and New Zealand, our arresters help safeguard transformers, switchgear, and cable systems with confidence.

Engineered for Local Conditions

Built for Australia’s harshest conditions, our surge arresters are tested to perform in high-fire-risk, high-moisture, and extreme temperature environments. Designed and manufactured for compliance and durability, each arrester ensures reliable overvoltage protection tailored to regional standards and utility requirements.

Flexible Configurations

From 12 kV to 145 kV, Insulect offers manual or motorised units, with options for earthing switches, auxiliary switches, and interlocks. Custom footprints and mounting options ensure a perfect fit for greenfield and brownfield installations alike.

End-to-End Support

We offer more than just hardware—our team provides complete lifecycle support, from engineering advice and on-site installation to training, refurbishment, and retrofit solutions. With local service and fast turnaround, we’re a partner you can rely on.

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 ensures 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.