The EVB series moulded-case vacuum circuit breakers are suitable for indoor switchgear in power systems operating at voltages of 10kV, 20kV, and 35kV, with a rated frequency of 50(60)Hz. They are designed for switching loads of varying characteristics and for applications requiring frequent operation. These breakers provide protection and control for electrical installations in industrial plants, power stations, and substations. The EVB series indoor vacuum circuit breaker operating mechanism employs a modular design, featuring a simple principle, compact structure, minimal transmission components, stable and reliable operation, and extended mechanical service life. The EVB series withdrawable functional units are suitable for integration into medium-voltage switchgear projects. By configuring different primary elements on the draw-out units, they can respectively perform busbar tie, power measurement, and overload or short-circuit protection functions for electrical equipment.
Principal Technical Parameters:
Rated Voltage: 12kV, 24kV, 40.5kV
Rated Current: 630–4000A (12kV), 630–2500A (24kV, 40.5kV) Rated Short-Circuit Breaking Current: 20–50kA
Mechanical life: ≥30,000 operations (below 31.5kA)/20,000 operations (40kA, 50kA)
Full-load breaking cycles: 30 cycles (below 31.5kA)/20 cycles (40kA, 50kA)
Product Features:
● E2-M2-C2 class vacuum circuit breaker;
● Anti-condensation, anti-contamination, low resistance;
● Modular mechanism;
● Silent gear transmission;
● Single-piece spring-loaded contact technology;
● Offers permanent magnet, side-mounted, motorised draw-out, intelligent monitoring and diagnostic solutions;
●Fully insulated, sealed, maintenance-free main circuit;
● External umbrella clusters on pole columns increase creepage distance, enhancing condensation and contamination resistance;
● Encapsulated pole columns protect arc extinguishing chambers from external hazards, ensuring long service life and high reliability;
● Standardised design enables product interchangeability.
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