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A vacuum circuit breaker is a type of circuit breaker where the arc quenching takes place in vacuum. The technology is suitable for mainly medium and high voltage application. developed but not commercially viable. The operation of opening and closing of current carrying contacts and associated arc interruption take place in a vacuum chamber also known as vacuum interrupter. The vacuum interrupter consists of a steel arc chamber in the center symmetrically arranged ceramic insulators. The vacuum pressure inside a vacuum interrupter is normally maintained at 10- 6 bar. Contacts design styles include transverse magnetic field( TMF) and axial magnetic field (AMF).

Meidensha proprietary contact materials prevent contact welding even with an actuator with small operating force. Compact size, high withstand voltage capability and heavy current breaking capability help vacuum circuit breakers meet Classes C2 and E2 of the IEC 62271-100 standard. Options include external insulation reinforcement for ratings of 24 kV and higher by adding Raychem heat shrink tubing or silicone rubber. Current interrupting capability for capacitor bank switching applications is also.
Meiden vacuum interrupter 12kV - Omnicor

12 kV

Meiden vacuum interrupter 36kV - Omnicor

36 kV

Meiden vacuum interrupter 72.5kV - Omnicor

72.5 kV

Meiden vacuum interrupter 145kV single break - Omnicor

145 kV

Vacuum interrupters for Circuit Breakers

Rated Voltage Rated lightning impulse voltage Power frequency withstand voltage Rated Current Short circuit breaking current with at least 30-40% DC component and Interrupter (Outdiameter-Style)
kV kV kV A 12.5 kA 16 kA 20 kA 25 kA 31.5 kA 40 kA 50 kA
7.2 60 20 630 M20QC
800/1250 M30RC
1600/2000 M40SC
2500/3150 M50TC
12/15 75 28 630 M52QC
800/1250 M51RC
1600/2000 M71SC
2500/3150 M71TC
17.5/24 95/125 38/50 630 M52QC*
800/1250 M72RC*
1600/2000 M102SC
2500 M132TC
36/38 175 80 630 M83QC*
800/1250 M123QC*
1600/2000 M163SC*
2500 M203TCB*
52 250 90 1250/2000 MA285SC*
72.5 325 140 1250/2000 MA317SC
* :Additional insulation necessary
** :Capacitor bank switching