Ningbo, China – March 31, 2026 – Richge, a leading Chinese manufacturer of high-voltage electrical components and switchgear accessories, officially launched its upgraded series of 24kV high-voltage insulation contact boxes. Integrating advanced insulation technology and precision manufacturing, the series is engineered for modern distribution networks and switchgear systems, offering seamless compatibility with Schneider BLOKSET switchgear. Strictly compliant with international industry standards, it meets the rigorous demands of high-voltage applications.
As a core component determining the safety and efficiency of high-voltage electrical systems, Richge’s 24kV insulation contact boxes are built with cutting-edge technology and strict quality control, delivering unparalleled electrical insulation reliability, robust connection protection, and long-term stable operation. Addressing common pain points of traditional insulation components such as insulation aging and loose connections, Richge’s product uses high-purity epoxy resin (EP) via vacuum casting. This premium material provides exceptional electrical insulation, ultra-high mechanical strength (tensile strength ≥ 80MPa), and excellent resistance to harsh environments (operating temperature: -40℃ to +80℃). Its advanced design and material selection enable stable performance even under extreme conditions including high humidity, heavy dust, and voltage fluctuations, effectively eliminating potential safety hazards.
Backed by Richge’s decades of R&D in high-voltage components, the 24kV series adheres to IEC 60694, GB/T 11022, GB/T 8287.1 and other international and national standards, with industry-leading core parameters that outperform comparable products to satisfy strict global high-voltage applications:
· Rated voltage: 24kV (50Hz/60Hz); rated insulation level: 42kV (1min power frequency withstand voltage), 125kV (lightning impulse withstand voltage)
· Insulation material: high-purity epoxy resin (EP); casting process: vacuum casting (bubble-free, uniform density); color: reddish brown (standard) or customizable
· Rated current: 630A / 1250A (optional); short-time withstand current: 25kA (3s); peak withstand current: 63kA
· Connection: suitable for 10–35mm² high-voltage cables or 30×4mm / 40×4mm busbars, with anti-loosening clamping structure and anti-corrosion terminals
· Protection class: IP40 (standard), IP54 (optional), effective dustproof and waterproof for indoor switchgear
The series is widely used in various high-voltage power distribution scenarios as a key insulation and connection component, suitable for:
· Power distribution systems: 10kV–35kV high-voltage distribution networks, urban and rural grid renovation, prefabricated compact substations
· Switchgear assemblies: indoor switchgear (including Schneider BLOKSET, ABB UniGear, Siemens 8DJH and other mainstream brands), VCB cabinets, ring main units (RMU)
· Industry & infrastructure: industrial and mining enterprises, high-rise buildings, commercial complexes, new energy (PV/wind) power distribution systems
Leveraging decades of experience in high-voltage component development, Richge’s 24kV insulation contact box series offers unique technical advantages beyond basic insulation and connection, creating a competitive edge hard to replicate:
· Superior insulation: vacuum-cast epoxy resin ensures no internal bubbles, preventing partial discharge and arcing, reducing short-circuit and equipment damage risks
· Stable & durable connection: precision-machined clamping structure and silver-plated terminals with contact resistance ≤5mΩ, stable connection, service life of over 30 years
· Standard compatibility: fully compliant with international standards, compatible with mainstream switchgear brands, customizable for special voltage levels and connection dimensions
· Strict quality control: 100% factory inspection for each unit, including insulation resistance test, power frequency withstand voltage test, mechanical durability test, with a pass rate of over 99.8%
As a trusted one-stop supplier of high-voltage insulation components, Richge provides a comprehensive product portfolio covering core insulation parts for 24kV high-voltage systems to meet diverse customer needs:
· 24kV epoxy resin insulation contact boxes (standard / anti-corrosion type)
· Reddish brown epoxy resin cast insulators (pin type, post type)
· Insulation bushings for switchgear (flange type, nozzle type, rated current 630A–2500A)
· Indoor epoxy resin insulation nozzle bushings (for VCB / RMU)
· Vacuum circuit breaker contact boxes (for 12kV / 24kV VCB)
· 24kV switchgear junction boxes (waterproof / non-waterproof optional)
A senior R&D engineer at Richge stated:“Richge upholds the philosophy of ‘technology-driven, quality-first’. The newly launched 24kV high-voltage insulation contact box series not only meets basic insulation and connection requirements but also integrates advanced materials and precision manufacturing to resolve pain points such as poor insulation durability and unstable connections in traditional products. We are committed to providing global customers with professional, reliable and cost-effective high-voltage insulation solutions.”
Author background: The following user experience is provided by Mr. Li, Senior Electrical Engineer at a Jiangsu Grid Company. With 15 years of experience in high-voltage distribution system design and operation, Mr. Li holds professional qualifications in high-voltage electrical engineering and has participated in more than 30 urban and rural grid renovation projects, with in-depth expertise in the performance and application of high-voltage insulation components.
Case and data: In October 2025, a Jiangsu Grid Company deployed 500 sets of Richge 24kV high-voltage insulation contact boxes in an urban grid renovation project. After six months of continuous operation, the units achieved zero failure rate. Average insulation resistance remained stable at 1,000MΩ (standard requirement ≥100MΩ), 10 times higher than the industry average. Contact resistance was controlled within 3mΩ (standard ≤5mΩ), with operating temperatures between 25℃ and 32℃ – 8℃ lower than conventional insulation contact boxes. The product also proved excellent moisture resistance during the rainy season (relative humidity 85%–95%), with no partial discharge or insulation degradation.
User feedback:“We have used insulation contact boxes from several manufacturers. The biggest issue was declining insulation after 1–2 years and loose connections requiring frequent maintenance and replacement, increasing operating costs,” Mr. Li commented. “Since adopting Richge’s 24kV contact boxes, maintenance frequency has been reduced by 80% and operational stability greatly improved. The vacuum-cast epoxy resin offers outstanding corrosion and moisture resistance, ideal for harsh urban substation environments. Richge’s after-sales team also provides on-site technical support within 24 hours, giving us full peace of mind.”
Headquartered in Ningbo, Zhejiang, China, Richge Technology Co., Ltd. is a professional manufacturer and supplier of high-voltage switchgear components and insulation products. With a specialized R&D team, advanced production lines including vacuum casting equipment and precision testing instruments, and a strict quality management system, the company focuses on R&D, production and sales of high-voltage insulation contact boxes, insulators, bushings and other products. Richge provides OEM/ODM customization services to global customers, with products exported to Europe, Asia, Africa and South America, widely recognized for reliable quality.
Richge Technology Co., Ltd.Email: sales@richgeswitchgear.comWebsite: www.richgeswitchgear.comWhatsApp / Phone: +86 189 5893 8078 (24-hour service)Address: Ningbo, Zhejiang, China
