What are SM Series Standoff Insulators used for?

They are used to support, space, and electrically isolate busbars, terminals, and components in switchboards, control panels, transformers, rail systems, and industrial electrical equipment.

What material are the insulators made from?

They are manufactured from a high-strength, glass-reinforced thermoset polyester composite with molded-in brass inserts.

Are these insulators compliant with AS/NZS 61439?

Yes. When installed correctly within a compliant assembly, the material and construction support the requirements of AS/NZS 61439 and IEC 60664 for creepage, clearance, and insulation performance.

What is the thermal rating?

The material is rated to Class F (155°C) continuous operating temperature.

Are they flame-retardant?

Yes. The composite material is UL 94 V-0 rated, providing self-extinguishing performance.

What thread sizes are available?

Standard options include M6, M8, M10, and M12 brass inserts.

Are the insulators suitable for harsh or corrosive environments?

Yes. They have excellent resistance to moisture, oils, grease, salt mist, and industrial contaminants, making them suitable for harsh environments.

What colour options are available?

Standard supply is Red, with Black or Natural options available for OEM, rail, or defence programs.

What torque should be applied to the inserts?

Use MISCO’s Torque Specification Guide for tightening values by thread size to ensure maximum performance and to avoid insert damage.

Are the insulators halogen-free and asbestos-free?

Yes. They are halogen-free, asbestos-free, REACH compliant, and RoHS 3 compliant.

Do they maintain performance under vibration?

Yes. The thermoset structure and molded inserts provide excellent vibration resistance for rail, mining, and mobile equipment.

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SM SERIES STANDOFF INSULATORS

SM Series Standoff Insulators are high-performance, moulded electrical supports engineered for demanding industrial and power-distribution applications. Manufactured from a glass-reinforced thermoset composite, the SM Series provides exceptional electrical, thermal, and mechanical performance while maintaining dimensional stability under load, heat, and vibration.

Designed for use in busbar supports, terminal arrangements, modular switchboard assemblies, transformer auxiliary systems, and industrial control equipment, these insulators deliver long service life and compliance-ready performance across Australian and international standards.

The SM Series is produced using high-strength moulded composite bodies with integrated metal inserts to ensure reliable torque retention and repeatable fastening performance. All components are designed, quality-checked, and supplied locally by MISCO Australia to support OEMs, switchboard manufacturers, utilities, rail, mining, and defence customers requiring high-quality insulation components with assured traceability.

SPECIFICATIONS

Product Form

The SM Series Standoff Insulators are supplied in a range of standardised configurations designed for electrical distribution equipment, switchboard construction, transformer assemblies, rail applications, industrial machinery, and defence systems.

They are available in:

Bobbin Style – A cylindrical profile with moulded-in metal inserts, ideal for compact busbar mounting and general electrical support.
Hexagonal Style – A hex-profile body that allows a spanner to engage securely, preventing rotation and enabling controlled torque application during installation.
Cylindrical Style – A smooth, round profile suited to uniform load support, tight clearances, and applications requiring straightforward alignment.

Standard Colours

Typically supplied in Red; Black or Natural variants can be produced for OEM, rail, or defence-specific requirements.

Thread Sizes

Offered with M6, M8, M10, and M12 inserts manufactured from high-quality brass for secure fastening and stable torque retention.

Height Options

Standard heights include 25, 30, 35, 38, 50, and 75 mm, with custom dimensions available upon request.

Compliance

Suitable for use in AS/NZS 61439 low-voltage switchgear assemblies
Material meets IEC 60664 Material Group I (CTI ≥ 600) for high creepage performance
UL 94 V-0 fire classification for self-extinguishing behaviour
Class F (155°C) thermal endurance rating
High dielectric strength for electrical insulation applications
Excellent arc and tracking resistance
Halogen-free, asbestos-free, and low-toxicity formulation
Conforms to RoHS 3 and REACH with no SVHC content
Engineered for low smoke emissions and reduced environmental impact
Resistant to oils, greases, moisture, and industrial contaminants
Suitable for indoor and protected outdoor electrical enclosures
Manufactured using electrical-grade, high-strength composite compounds
Integrated metal inserts produced to controlled mechanical tolerances
Supports compliant creepage and clearance design in accordance with IEC 60664
Internal QC includes dimensional inspection, insert retention, and torque verification
Batch traceability available for OEM, utility, rail, and defence programs

MECHANICAL PROPERTIES

ELECTRICAL PROPERTIES

THERMAL PROPERTIES

High Dielectric Strength
Engineered for excellent insulation performance in power distribution, switch gear, transformer, and control equipment, maintaining electrical integrity under elevated voltage stress.
UL 94 V-0 Flame-Retardant Composite
Manufactured from a self-extinguishing, thermoset polyester compound that provides superior fire safety characteristics in accordance with industry standards.
Class F Thermal Endurance (155°C)
Designed to withstand continuous thermal loading without degradation, ensuring long-term reliability in hot, enclosed, or high-current environments.
Exceptional Tracking and Arc Resistance
High CTI (≥ 600) formulation minimises surface tracking and arcing, supporting compliant creepage performance under IEC 60664 and AS/NZS 61439.
High Mechanical Strength and Structural Stability
Strong compressive, tensile, and flexural properties deliver robust support for bus bars, terminals, and mounting components, resisting deformation under load.
Precision Brass Threaded Inserts
Consistent torque retention and long-term fastening integrity through molded-in brass inserts that resist pull-out, rotation, and thermal expansion mismatch.
Low Moisture Absorption
Maintains stable electrical and mechanical properties in humid, coastal, or industrial environments with minimal water uptake.
Chemical and Environmental Resistance
Resists oils, greases, solvents, salt spray, and airborne industrial contaminants, ideal for harsh electrical and mechanical installations.
Dimensional Stability Across Temperature Cycling
Thermoset construction will not soften, creep, or deform when exposed to heat, vibration, or mechanical stress.
Vibration-Tolerant Design
Suitable for rail traction systems, mining infrastructure, industrial machinery, and other high-vibration environments where fastening security is critical.
Multiple Standard Sizes and Variants
Offered in a wide range of standard heights (25–75 mm) and thread sizes (M6–M12), with additional variants or custom machining available upon request.
Stable Performance in Enclosed Switchboard Conditions
Maintains structural and electrical integrity in switch rooms, MCCs, power distribution boards, BESS enclosures, inverter housings, and industrial cabinets.
Low Smoke / Low Toxicity Material Composition
Halogen-free and asbestos-free, supporting safer installation environments and reducing hazardous emission risks.

Busbar Support & Separation
Used to mount, space, and mechanically isolate copper and aluminum bus bars in switchboards, distribution boards, and industrial power systems.
AS/NZS 61439 Switchboard Construction
Ideal for low-voltage switch gear assemblies, including main switchboards, distribution boards, control panels, and MCCs, supporting compliant creepage and clearance design.
Transformer & Rectifier Equipment
Provides stable, insulated support for auxiliary components, terminals, tap-changer assemblies, and power electronic interfaces.
Industrial Control Equipment
Suitable for motor control centers, automation cabinets, VSD and inverter assemblies, PLC panels, and electrical skids.
Rail Traction & Rolling Stock Systems
Performs reliably in environments subject to vibration, shock, and temperature variations. Suitable for traction systems, auxiliary converters, and electrical panels.
Defence Electrical Cabinets & Power Conversion
Appropriate for defence - grade power distribution units, communications systems, electrical enclosures, and equipment requiring high reliability and traceability.
Renewable Energy Infrastructure
Used within BESS enclosures, solar inverter cabinets, wind-farm control systems, and hybrid renewable infrastructure requiring robust electrical isolation.
Mining, Oil & Gas, and Heavy Industrial Machinery
Suitable for harsh environments with exposure to heat, dust, chemical contaminants, and heavy vibration, maintaining performance under mechanical load.
Utilities, Water Treatment & Infrastructure
Supports electrical systems in pumping stations, treatment plants, substations, and general utility machinery.
General Electrical Mounting
Effective as insulating spacers for terminal blocks, busbar supports, mounting plates, auxiliary devices, and equipment within electrical housings and machinery.

Switchboard Builders & Electrical Panel Manufacturers
For main switchboards, distribution boards, MCCs, control panels, and compliant AS/NZS 61439 assemblies.
Transformer & Power Equipment Manufacturers
Used in auxiliary systems, terminals, tap-changer assemblies, rectifier units, and custom power-conversion equipment.
Rail, Transport & Rolling Stock
Suitable for traction systems, onboard electrical cabinets, signalling equipment, and rail infrastructure where vibration resistance is essential.
Defence & Aerospace
Applied in military power distribution units, communication systems, ruggedised electrical enclosures, and platforms requiring traceability and reliability.
Renewable Energy & Battery Storage
Ideal for BESS enclosures, solar inverter systems, wind turbine control cabinets, micro grids, and hybrid renewable installations.
Utilities, Water Treatment & Infrastructure
Used in electrical control equipment for water treatment plants, pumping stations, substations, and utility-service infrastructure.
Industrial Machinery & Automation
Supports electrical assemblies in production machinery, automation cells, robotics, and heavy industrial equipment.
Mining, Oil & Gas, and Resource Industries
Performs reliably in harsh environments with heat, vibration, dust, corrosive atmospheres, and mechanical stress.
Automotive & Specialty Vehicle Systems
Suitable for EV charging infrastructure, auxiliary power units, and onboard electrical systems in specialty vehicles.
Electrical & Electronics Manufacturing
For insulated mounting, spacing, and support within control devices, power electronics, and test equipment.
Construction & Building Services
Used in commercial electrical cabinets, building switch rooms, HVAC control panels, and site power systems.
Marine, Ports & Offshore Equipment
Performs well in corrosive and moisture-laden environments requiring stable electrical insulation and structural integrity.

Long Service Life
The thermoset composite will not soften, deform, or creep under load, ensuring stable performance throughout the lifespan of the electrical assembly.
Improved Electrical Safety
High dielectric strength, excellent arc resistance, and superior tracking resistance reduce the risk of electrical faults, flash over, and surface deterioration.
Reliable Mechanical Support
High compressive and flexural strength deliver dependable support for bus bars, terminals, and power components under mechanical stress and vibration.
Consistent Fastening Performance
Molded - in brass inserts provide secure thread engagement and repeatable torque application, reducing maintenance and enhancing installation reliability.
Reduced Downtime & Maintenance Costs
Stable dimensional performance and resistance to environmental degradation reduce the need for replacement, inspection frequency, and corrective maintenance.
Enhanced Fire Safety
UL 94 V-0 material composition ensures self-extinguishing behavior, enabling safer installation in enclosed switchboards, control rooms, and industrial environments.
Resistance to Harsh Environments
Chemical, moisture, and contamination resistance make the SM Series suitable for coastal, industrial, mining, and corrosive atmospheres.
Optimized for AS/NZS 61439 Compliance
Supports compliant creepage and clearance spacing, material selection, and thermal considerations within switchboard assemblies.
Reliable Performance Under Thermal Load
Class F thermal rating (155°C) enables installation near heat-generating components without degradation of mechanical or electrical properties.
Vibration-Tolerant Design
Ideal for rail traction, mining machinery, mobile plant, and defence equipment where shock and vibration resistance are essential.
Versatility Across Designs
Wide range of thread sizes, heights, and body forms allows integration into existing and newly designed assemblies without custom tooling.
Local Availability & Support
MISCO Australia provides fast lead times, technical assistance, product traceability, and continuity of supply for long-term manufacturing programs.

Downloads

All supporting documents for this material are available for download, including the latest technical data sheet, safety data sheet, machining and processing guidance, compliance information, and relevant product brochures.

These controlled documents provide specifications, performance data, handling requirements, and application notes to assist with design, material selection, and fabrication.

Each file is maintained by MISCO Australia to ensure current, reliable information for switchboard, transformer, industrial, and defence grade applications.

Frequently Asked Questions

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