Surge Arrester Class C

Engineered for Spark-Free Protection in Demanding Conditions

Insulect’s Class C Surge Arresters are designed to protect low-voltage electrical installations from overvoltage transients resulting from indirect lightning strikes and switching operations. These arresters are suitable for installation downstream of the main distribution board, providing an additional layer of protection for sensitive equipment.

Send an Enquiry

Spark Free Technology

Offering spark-free technology in a compact form, Class C arresters are ideal for installation in confined or indoor environments. With no external sparking or venting, they’re safe to install near sensitive electronics, buildings, and personnel, delivering discrete, continuous protection with zero maintenance.

Engineered for Safety

Insulect’s Class C arresters are built with polymeric insulation that resists moisture, UV degradation, and mechanical stress. The result is a robust, non-corrosive enclosure that supports a long service life and consistent protective performance in fluctuating low-voltage environments.

Reliable Medium Voltage Protection, Built to Standards.

Engineered for distribution network applications, Class C arresters deliver consistent protection from transient overvoltages—supporting system stability and asset longevity in typical service conditions.

Reducing Risk. Enhancing Longevity.

Available from 3 kV to 36 kV, Class C arresters meet IEC 60099-4 and IEEE C62.11 standards, with 5 kA discharge current ratings, ensuring compliance for distribution-level protection across diverse utility needs.

TECHNICAL

Features & Functionality

Functionality & Options

Designed for general distribution protection where visible spark operation is not a requirement.
Lightweight polymer housing and fibreglass-reinforced core enable simple and secure mounting across poles or steel structures.
Suitable for urban, rural, or industrial networks, delivering consistent protection from transient overvoltage events.
Fully sealed with HTV silicone to ensure durability against moisture, dust, and UV exposure.

Key Technical Specifications

Voltage Rating Range: 3 kV – 36 kV
Discharge Current Ratings: 5 kA
Arrester Class: Class C (Polymer Distribution)
Standards Compliance: IEC 60099-4:2004, ANSI/IEEE C62.11:2005
Housing Material: High-temperature vulcanised (HTV) silicone with fibreglass-reinforced internal structure

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.

See All Projects

Start Reading

Wunghnu Solar Farm

Start Reading

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.