Disc Suspension Insulators
IEC 60305 · ANSI C29.2

Porcelain disc insulators are the traditional choice — well-understood by utility maintenance crews, repairable in the field, and available in all four anti-pollution profiles. Toughened glass insulators have one key advantage: a failed unit shatters completely, making failure detection visual from the ground without ultrasonic equipment. This makes glass particularly attractive for remote, long-distance transmission lines where patrol access is infrequent.

Selection follows IEC 60815. For clean inland areas (Class A/B), standard XP profile at 295–320 mm creepage per disc is sufficient. For moderate pollution, dry or dusty inland environments (Class C), use double-shed XWP at 400–450 mm creepage. For coastal salt-fog or heavy industrial (Class D/E), specify fog-bell XHP at 430–505 mm per disc, or XHP4-300 at 690 mm for the most severe conditions. Vuulcan provides a free pollution-class selection report — share your site location and IEC 60815 pollution class and we will recommend the optimal profile and string length.

All disc insulators use IEC 60305-compliant ball-and-socket cap-and-pin hardware. Standard socket sizes: 16 mm (up to 160 kN SML) and 20 mm (210–530 kN SML). Hot-dip galvanized steel per ISO 1461. Cement bonding meets ANSI C29.2 and IEC 60305.

Yes. Our heritage production base produces both porcelain and toughened glass discs with identical cap-and-pin socket dimensions (IEC 60305). You can specify both materials on a single purchase order — one QC system, one shipment, one set of routine test reports.

Every shipment includes: 100% mechanical load test per IEC 60305, dimensional inspection records, hot-dip galvanizing test report (per ISO 1461), and cement bonding verification. Type-test reports (IEC 60305 — puncture, flashover, mechanical, thermal) are available for all series. KEMA type-test reports available on request.