Isolators & Disconnectors

• An isolator (disconnector or isolator switch) is a mechanical, off-load switching device used to visibly isolate a section of an electrical circuit for safe maintenance and inspection.
• Manufactured for 11 kV, 22 kV and 33 kV medium-voltage substations, switchyards and distribution networks.
• Provides a positive, visible air-break isolation gap that confirms the isolated section is dead before any work begins.
• Built with high-grade porcelain / polymer insulators, silver-plated high-conductivity copper contacts and hot-dip galvanised steel structures for a long, corrosion-free life.
• Available as single-break, double-break and centre-break types, single- or triple-pole, with an optional integral earth switch and manual gang or motorised operation.

Applications Of Isolators

• Medium-voltage substations and switchyards
• Busbar and feeder isolation
• Transformer and capacitor-bank isolation
• Overhead line disconnection points
• Indoor and outdoor switchgear installations

Salient Features

• Visible, positive air-break isolation gap
• Silver-plated copper main and arcing contacts
• Self-aligning, anti-friction contact fingers
• Porcelain / polymer post insulators
• Hot-dip galvanised steel base and operating pipe
• Optional integral earth (grounding) switch
• Manual gang operation or motor drive with interlocks

Technical Specifications

Advantages Of Isolators

• Guarantees operator safety with clearly visible isolation
• Robust, weatherproof and corrosion resistant
• Low maintenance with a long operational life
• Smooth, reliable operation in all weather conditions
• Optional earthing for complete work-zone safety

Related Substation Equipment Range

Switching and protection equipment is specified alongside the transformer it protects. Related options include autoreclosers for automatic restoration after transient faults, package substations for compact factory-built installations, electrical panels for LT distribution and control, and servo voltage stabilizers where incoming supply voltage swings. Browse the full substation equipment range to compare every model side by side.

Quality Assurance & Testing

Every unit is built at our ISO 9001:2015-certified works in Greater Noida, where Macroplast has designed, manufactured and tested transformers since 1983, with most components — including tanks and steel fabrication — produced in house. Each transformer is routine tested in our dedicated high-voltage and temperature-rise testing laboratory before dispatch, and type tests are carried out in government-accredited laboratories against the relevant IS and IEC standards. See our manufacturing and testing infrastructure for plant and laboratory details, or read more about Macroplast Transformers.