Standoff insulators support and secure busbars or other live electrical equipment while maintaining safe insulation distances. They prevent short circuits, flashovers, and electrical discharge in switchgear, transformers, and panelboards, engineered to withstand high mechanical and electrical stresses per UL, IEEE, IEC, and NEMA standards.
These insulators are manufactured from UL-recognized fiberglass-reinforced thermoset polyester, polymeric composites, or high-temperature ceramic in ISO 9001:2015 compliant facilities. Each lot undergoes mechanical and electrical testing. Key advantages include flame retardancy with UL 94 V-0 rating, track resistance, and high arc resistance preventing surface-conducting paths under high voltage. They combine high mechanical strength with superior dielectric properties, offering greater moisture and heat tolerance than plastic alternatives.
Voltage ratings range from 600V to 15kV with Basic Insulation Level (BIL) up to 250 kV. Heights span 1 to 6 inches, diameters from 1.13 to 4 inches, in hexagonal, round, or octagonal shapes. Threaded inserts are aluminum, steel, or brass with common sizes including 1/4-20, 3/8-16, M6, and M8, supporting torque up to 45 ft-lbs. Dielectric strengths reach 40 kV with arc resistance times of 180 seconds.
Applications include indoor electrical panels, switchboard accessories, and bus bar supports isolating conductors from grounded structures. They serve power distribution, renewable energy, rail, marine, and data centers, with selection accounting for humidity, dirt, and compliance requirements like UL 891 Annex G.
Enhance Your Systems with RaxPower Standoff Insulator Supplier
RaxPower, established in 2003 and based in Hebei Province, China, is a trusted manufacturer of high-quality stand-off insulators, with over 21 years of manufacturing and exporting experience. We offer both standard and custom designs, including retrofit solutions, for a wide range of indoor and outdoor applications. Our epoxy stand-off insulators deliver exceptional mechanical strength, electrical performance, and long-term durability, supported by advanced processes like hot forging for superior part integrity and accurate sizing.
Our commitment to quality ensures performance and dependability through rigorous testing and compliance with standards. We operate with 17,000 square meters of production facilities and utilize automation for uniform products and on-time delivery. Each insulator is subjected to multi-stage quality control, including load tests and gauge tests per IEC standards, with all items reviewed twice before packing to guarantee reliability. Our products meet ANSI, IEEE, IEC, and NEMA requirements, backed by SGS-certified assurance.
Contact RaxPower to discuss your project and receive expert technical support.
| Parameter | Specification |
|---|---|
| Material | Fiberglass-reinforced thermoset polyester, polymeric composites, or high-temperature ceramic |
| Voltage Rating | 600 V to 15,000 V |
| Basic Insulation Level (BIL) | Up to 250 kV |
| Height | 1 inch to 6 inches |
| Diameter | 1.13 inches to 4 inches |
| Shape | Hexagonal, round, or octagonal |
| Thread Size | 1/4-20, 3/8-16, 1/2-13, 5/8-11, or metric equivalents (M6, M8, M10) |
| Insert Material | Aluminum, steel, or brass |
| Torque Strength | Up to 45 ft-lbs |
| Dielectric Strength | Up to 40 kV |
| Arc Resistance | 180 seconds |
| Track Resistance | 600 minutes |
| Flammability | UL 94 V-0 |
| Tensile Strength | 1,200 lbs to 5,500 lbs |
| Cantilever Strength | 500 In-Lb to 1,300 In-Lb |
| Compression Strength | 8,000 lbs to 45,000 lbs |
| Creep Distance | Height + 0.25 inches to Height + 1.125 inches (varies by model) |
Frequently Asked Questions (FAQS)
What materials are used in standoff insulators?
RaxPower standoff insulators are manufactured from fiberglass-reinforced thermoset polyester, ceramic for high-temperature applications, and epoxy for enhanced durability. These materials provide excellent mechanical strength, arc resistance, and dielectric properties.
Are standoff insulators designed for indoor or outdoor use?
RaxPower offers insulators suitable for both indoor and outdoor applications. Indoor models are standard, while outdoor-rated options include UV protective coatings to resist environmental factors like moisture and dirt accumulation.
What voltage ratings do standoff insulators support?
Our standoff insulators are available with voltage ratings ranging from 600V to 15,000V, designed to meet various application needs in low-voltage and high-voltage electrical systems.
How do I select the right standoff insulator for my application?
Consider the voltage requirements, mechanical load (tensile, cantilever, and compression strength), environmental conditions, and compliance with industry standards. RaxPower provides detailed specifications to guide your selection based on these factors.
What certifications and standards do standoff insulators meet?
Our standoff insulators are UL recognized and comply with IEEE, IEC, NEMA, ANSI, and UL 891 standards. They undergo Hi-Pot testing and rigorous electrical and mechanical performance testing in an ISO 9001:2015 compliant environment to ensure safety, reliability, and dependability for demanding electrical applications including critical grid systems.
Can you customize standoff insulators for unique application requirements?
Yes, we provide custom molded standoff insulators from materials such as BMC, SMC, polyamide, and epoxy. You can choose from various insert materials like aluminum (corrosion-resistant), steel (high-torque), or brass (reliable performance), and we tailor dimensions, thread sizes, and designs to your specific electrical and mechanical property needs with testing capabilities for new product designs.
Are your insulators designed to withstand demanding conditions like those in railway or renewable energy systems?
Our standoff insulators are used in railway electrification, renewable energy, and telecommunications. They feature high resistance to UV, heat, moisture, and constant vibration. Specialized designs and materials ensure durability and long-term reliability in harsh environments.
What support do you provide for large-scale projects requiring bulk quantities?
We offer competitive bulk pricing discounts for quantities of 100-249 and 250+, with reliable shipping options including free shipping on many orders. Our large inventory, automation, and extensive warehousing ensure on-time delivery for entire project orders, helping you meet tight deadlines.
Get A Quick Quotation Today
