0HK.412.530SM
LW36A-126/145
High Voltage SF6 AC Circuit Breaker
9/30
Long term current carrying loop consist by above wire connection plate, fixed contact base, fixed main
contact, cylinder, middle contact, bottom support base, bottom wire connection plate. At the bottom of
cylinder’s thermal expansion chamber installed non-return valve, at the bottom of plenum chamber
installed air return valve and pressure relief device.
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3 Support porcelain tube
Support porcelain tube work as support explosion chamber and insulated to ground. In the porcelain
tube installed insulated tie bar, work as insulated to ground and mechanical drive. The support
porcelain tube is made by high strength porcelain, it is high strength and good airtightness.
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2 Regulating lever box
Regulating lever box work as transfer the operating mechanism’s output action to insulated tie bar, and
finally transfer to moving part of explosion chamber, to complete the circuit breaker’s switch on and
switch off. The regulating lever box installed valve for connecting the gas charge pipeline in base.
When the gas charge pipeline was not connected, the whole pole is in seal state. The regulating lever
shell made by high airtightness aluminium alloy, there are location holes can fixed the pole at the
switch off position.
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5 The principle of circuit breaker arc suppression
（
see drawing 5
）
A switch on position B breaking heavy current C breaking low current D switch off position
1. fixed arc contact 2. main contact 3. spout 4. moving arc contact 5. cylinder 6. non-return valve
7. pressure relief valve 8. pressure reduce valve 9. plenum chamber 10. thermal expansion chamber
Drawing 5 the principle of arc suppression
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