Liquid Silicone Protective Cover for Power Busbar

# Liquid Silicone Protective Cover for Power Busbar

Product Overview

The Liquid Silicone (LSR) Protective Cover for Power Busbar is a high-performance insulating component engineered specifically for the electrical power industry, designed to eliminate short-circuit risks, prevent environmental corrosion, and extend the service life of low, medium, and high-voltage busbar systems. Injection-molded from food-grade, high-purity liquid silicone rubber, this cover offers a seamless, custom fit for straight busbar segments, elbow joints, T-connectors, and busbar terminal connections, eliminating the installation gaps common to traditional heat-shrink or PVC protective sleeves.

At its core, this product combines exceptional dielectric strength, extreme temperature resistance, and long-term weatherability to address the most demanding operating conditions in power distribution infrastructure. Unlike traditional thermoplastic protective components, it maintains stable insulating performance even when exposed to arc flashes, salt spray, UV radiation, and rapid temperature fluctuations, making it suitable for both indoor switchgear and outdoor overhead busbar applications. Its self-extinguishing flame retardant formulation meets UL 94 V-0 requirements, preventing the spread of fire in the event of electrical overheating.

The cover features a snap-fit or peel-and-stick installation design, eliminating the need for specialized tools or heat treatment during assembly, which reduces on-site installation time by up to 70% compared to heat-shrink alternatives. Precision-molded to match the exact dimensions of standard copper and aluminum busbars, it provides full 360° coverage of live conductive surfaces, reducing accidental electric shock risks for maintenance personnel and preventing small animals (such as rodents and birds) from causing accidental short circuits.

Technical Specifications

Material Properties

Physical Performance

Process Parameters

Product Advantages

1. Superior Long-Term Insulation Reliability

Unlike PVC or EPDM busbar sleeves that degrade and lose insulating performance after 5–10 years of exposure to heat or UV radiation, this LSR protective cover maintains stable dielectric strength for over 25 years in outdoor environments. Its high CTI value of 600 V prevents surface tracking and arcing even in heavily polluted, high-humidity operating conditions, reducing unplanned power outage risks by up to 90% compared to unprotected busbars. The non-hygroscopic material formulation ensures insulation performance remains unaffected by rain, fog, or condensation.

2. Extreme Environmental Adaptability

The cover can withstand extreme temperature fluctuations from -60°C in cold regional power grids to +220°C in high-load operating busbar systems without cracking, warping, or losing adhesion. It resists degradation from oil, ozone, sulfur dioxide, and other industrial corrosive gases, making it suitable for use in petrochemical plants, coastal power facilities, and mining sites where traditional protective components fail prematurely. UV-stabilized additives prevent discoloration and brittleness even after decades of direct sunlight exposure.

3. Fast, Low-Risk Installation

The snap-fit or pressure-sensitive adhesive (PSA) backing design eliminates the need for open-flame heat treatment required for heat-shrink sleeves, eliminating fire hazards during on-site installation. The precision-molded profile fits tightly to busbar edges and joints without cutting or custom trimming, reducing installation labor time by 70% and allowing for retrofitting on energized busbars (when installed by certified personnel using appropriate PPE). No volatile organic compounds (VOCs) are released during installation or operation, making it safe for use in enclosed switchgear rooms with limited ventilation.

4. Enhanced Operational Safety

The full-coverage design eliminates exposed live conductive surfaces, reducing accidental electric shock risks for maintenance personnel and preventing short circuits caused by small animals, falling metal debris, or dust buildup. The self-extinguishing flame retardant formulation stops burning within 10 seconds of removing the ignition source, and produces no toxic, corrosive smoke during combustion, protecting equipment and personnel in the event of an electrical fire.

Applications

This LSR protective cover is widely used across global power transmission and distribution infrastructure, with common use cases including:

• Low-voltage distribution systems: 0.4kV busbars in industrial control cabinets, data center power distribution units (PDUs), and commercial building distribution boards, preventing short circuits caused by dust accumulation and accidental contact.
• Medium-voltage power infrastructure: 10kV–35kV busbars in indoor switchgear, box-type substations, and wind turbine power conversion systems, protecting against insulation degradation from high humidity and salt spray in coastal wind farms.
• High-voltage substations: 66kV–220kV outdoor busbar connections and jumper joints, eliminating animal-induced short circuits and reducing flashover risks in heavily polluted industrial zones.
• Special industrial scenarios: Busbar systems in coal mines (flame-retardant, anti-static grade), petrochemical plants (corrosion-resistant grade), and high-speed railway traction power supply systems (vibration-resistant grade), customized to meet industry-specific operating requirements.
• Renewable energy projects: Photovoltaic inverter DC busbars and energy storage system power connections, where the wide operating temperature range and long service life match the 25+ year design life of solar and energy storage assets.

Selection Guide

Hardness Selection

• 40 Shore A: Recommended for irregularly shaped busbar joints and frequently disassembled connections, as its higher flexibility allows for repeated installation and removal without tearing. Suitable for low-voltage applications with complex busbar layouts.
• 50 Shore A (standard): Balances flexibility and structural rigidity, suitable for most straight busbar segments and standard elbow/T-connectors in 0.4kV–35kV systems.
• 60–70 Shore A: Recommended for high-voltage outdoor busbars and applications with high mechanical impact risks, as its higher rigidity prevents deformation under strong wind and heavy ice loads.

Size Specifications

All standard covers are sized to match common copper/aluminum busbar dimensions:

• Low-voltage series: Fits busbar widths from 20mm to 125mm, thicknesses from 2mm to 12mm
• Medium-voltage series: Fits busbar widths from 40mm to 200mm, thicknesses from 3mm to 15mm
• High-voltage series: Custom sized based on busbar conductor diameter and creepage distance requirements (minimum creepage distance of 31mm/kV for outdoor applications)

For non-standard busbar profiles or custom joints, provide 2D drawings or 3D models for customized molding design.

Material Grade

• Standard industrial grade: Meets general indoor and outdoor power application requirements, suitable for most substation and switchgear scenarios.
• Flame-retardant anti-static grade: Volume resistivity adjusted to 1×10⁸–1×10¹² Ω·cm, suitable for coal mine and explosive hazardous area applications in compliance with IEC 60079 standards.
• High thermal conductivity grade: Thermal conductivity of 0.8 W/(m·K), recommended for high-load busbar systems where heat dissipation is a priority, reducing busbar operating temperature by 5–8°C compared to standard covers.

Quality Assurance

Our LSR busbar protective covers are manufactured in an ISO 9001, ISO 14001, and ISO 45001 certified production facility, with strict quality control checks implemented at every stage of production:

• Raw material inspection: Each batch of LSR material undergoes 100% testing for dielectric strength, flame retardancy, and impurity content before entering the production line.
• In-process testing: Dimensional accuracy, surface finish, and fit tolerance are inspected for every 50 units produced, with statistical process control (SPC) monitoring to ensure consistent quality.
• Finished product testing: 10% of each production batch undergoes 1-minute power frequency withstand voltage testing (3kV for low-voltage, 42kV for medium-voltage, 95kV for high-voltage grades) to verify insulation performance, alongside random sampling for tensile strength, elongation, and aging resistance testing.

All products hold CE, CB, and UL certification, and are fully compliant with IEC 60684, GB/T 12168, and DL/T 1585 power industry standards. We provide a 5-year free replacement warranty for all standard products, and a 25-year performance warranty against insulation failure, cracking, or abnormal degradation under normal operating conditions, with full after-sales technical support for installation and maintenance guidance.