12kv Mv Withdrawable Embedded Pole Type Vacuum Circuit Breaker Kema Certifified

Product overview

VMG series embedded pole vacuum circuit breakers are applicable to 12kV, three-phase AC 50Hz indoor switchgear components and can serve as protection and control units for industrial and mining establishments and power transformer substation equipments. With modular and independent-frame design for their spring operating
mechanisms, VMG circuit breakers can operate with KYN28-12(24) mid-set and fixed switchgear cabinets. These circuit breakers are subject to both fixed installation and assembly with chassis as a handcart unit.

Normal service condition

Altitude: ≤1000m
Ambient temperature:
Maximum temperature    +40ºC
Minimum temperature       -15ºC
Average air temperature(24-h)   +35ºC
Ambient humidity:
Maximum average humidity
24 hours ≤ 95%
1 month ≤ 90% 
Maximum water vapor pressure
24 hours ≤ 2.2kpa
1 month ≤ 1.5kpa
Solar radiation is negligible.
Vibration from the outside of switchgears and control-gears is negligible. The ambient air has no obvious pollution of dust ,smoke, corrosive or combustible gases, steams or smog.

Human-oriented design
VMG series vacuum circuit breakers are Murge's independently developed new generation of medium-voltage embedded pole models, which have applied for many technical patents, past a package of type tests of the National High-voltage Quality Monitory and Inspection Center and obtained ASTA international certification. The
products feature beautiful shape design, easy operation, high reliability and long service life.

Class M2, C2 and E2 model
VMG series vacuum circuit breakers are available in specific environments, free of maintenance and capable of frequent operation. Compared with traditional circuit breakers, these breakers have their mechanical endurance raised to 20,000 ops from 10,000 ops with an enormous improvement. The type test for capacitive current breaking shows an extraordinarily low re-striking probability. These products feature prolonged electrical endurance and free maintenance.

VMG circuit breaker features high stability and high reliability
In terms of mechanisms, VMG series vacuum circuit breakers are given special optimization totransmission parts. Modular spring mechanisms have such advantages as convenient maintenance, short power-off maintenance, high versatility of parts, and boast better compatibility with vacuum interrupters, which greatly improves the technical parameters and delivers more excellent performance.

Applicable standards
IEC62271-100 High-voltage switchgear and control-gear-Part 100: Alternating-current circuit- breakers.

Secondary circuit
VMG series vacuum circuit breakers adopt modular design for their secondary control circuit boards. The electric connection of the mechanisms employs high-grade self-fastened plugs, which both facilitates replacement and ensures reliable electrical connection.

High-performance oil buffer
High-performance breaking buffer can markedly reduce the overshoot and rebounding amplitudes of the moving contact of a vacuum circuit breaker in breaking, thus avoiding the loss of mechanical endurance due to partial over fatigue of vacuum interrupter bellows resulting from moving contact overshoot. As the rebounding amplitudes of the moving contact reduces, no re-ignition and restrike is found during the switching capacitor bank test.

Technical Parameters