KENJING Isolation Circuit Breaker Switch on Environmental Protection Cabinet

The KENJING Isolation Circuit Breaker Switch integrates a vacuum circuit breaker inside a sealed environmental protection cabinet to deliver dependable medium-voltage switching and isolation for distribution feeders, RMUs, and compact substations. Optimized for 12 kV networks and 630 A feeders, this vacuum circuit breaker achieves 20/4 kA or 25/3 kA thermal stability, 50/63 kA making, and 10,000 mechanical operations. With 42/48 kV power-frequency and 75/85 kV impulse withstand levels, low ≤60 µΩ main circuit resistance, and a 1.25 bar gas box, the vacuum circuit breaker maintains low losses and high dielectric margins. Ideal where compact, sealed, medium voltage vacuum circuit breaker solutions are required.

Key Features and Advantages

• MV performance, compact footprint – 12 kV class, 630 A rated vacuum circuit breaker for feeder protection and sectionalizing in RMUs/cabinets.

• Fault duty – Rated breaking/thermal stability: 20 kA/4 s or 25 kA/3 s; rated short-circuit making 50/63 kA; peak withstand 50/63 kA; supports 30 short-circuit closing operations.

• Dielectric strength – Power-frequency withstand 42 kV (to ground/phase-phase) / 48 kV (across contacts); lightning impulse 75/85 kV for overvoltage resilience.

• Endurance – 10,000 operations (arc-chamber); 5,000 operations (isolating/earthing); engineered for low maintenance vacuum circuit breaker service.

• Low resistance path – ≤ 60 µΩ main circuit resistance reduces I²R losses and heating.

• Environmental protection cabinet – 1.25 bar gas box; sealed design enhances reliability in dust, humidity, and corrosive atmospheres; pairs perfectly with 12kV vacuum circuit breaker applications.

• Operator safety & selectivity – Independent isolation/earthing functions, clear operation sequences, and predictable vacuum circuit breaker interruption.

Why Choose Us (KENJING)

• Engineer-led designs focused on grid code compliance and lifecycle cost.

• Type-tested assemblies with documented dielectric and short-circuit performance.

• Responsive customization for control schemes, interlocks, CT/VT options, and communication interfaces.

• Global support – application sizing, commissioning guidance, and spares throughout service life.

Upgrade feeder reliability with a sealed vacuum circuit breaker cabinet engineered for endurance and safety. Contact KENJING for drawings, pricing, and lead time, or request a configuration matched to your protection scheme.