Silverstone supplies cast epoxy resin insulators for indoor medium-voltage switchgear — support, post and busbar insulators across the ZJ and ZN28 series for 3.6–12kV panels. High mechanical strength, precise threaded inserts and consistent casting quality make them a drop-in fit for air-insulated switchgear, ring main units and breaker compartments. Sourced from qualified manufacturers, with OEM marking available.
Key Specifications
Product class
Cast epoxy resin support / post insulator (indoor)
Type range
ZJ101-12 to ZJ146-12 series · ZN28-101 / ZN28-102 series
Export units to IEC standards or project specification
Sourcing base
Suzhou Industrial Park, Jiangsu, China
Typical configurations shown. Final ratings, dimensions and test reports are confirmed per project datasheet — include your specification with the inquiry. Download brochure (PDF) →
Typical Applications
MV switchgear panelsRing main unitsBusbar supportCircuit breaker compartmentsIndoor substations
Frequently Asked Questions
What information do you need to quote epoxy resin insulators?
Type reference or drawing, rated voltage, overall dimensions and insert thread sizes, quantity and destination port. With these, we return a priced offer with lead time within 24 hours on working days.
Can you match an existing switchgear insulator design?
Yes. Send the drawing or sample dimensions and we will source a matching cast epoxy unit — the standard ZJ series covers 3.6–12kV panels, and custom moulds can be arranged for project volumes.
Do you support OEM branding on epoxy insulators?
Yes. OEM marking, custom colours, packaging and documentation packages are available for panel builders, bidding agents and EPC contractors as part of our supply service.
Are test reports available with each shipment?
Each batch ships with routine test reports, including power-frequency withstand verification. Type test certificates for specific types are available on request.
