Description and operation
Description of the interrupting chambers
GE Information08- 2016 L12- 105EN/04
2/4
Interrupting chamber
Quenching medium
The quenching medium is pressurized SF
6
gas or - in particular instances -
pressurized SF
6
+CF
4
gas mixture.
Interrupting principle
The interrupting chamber is of thermal blasting type, using the energy from
the arc, with an auxiliary auto pneumatic effect.
Diagram
421
Description
The interrupting chamber has been designed in such a way as to increase the
mechanical resistance of the working part and take advantage of the low wear
rate of the contacts subjected to the arc in SF
6
. The working part is enclosed
in a leak tight ceramic envelope, providing insulation between the circuit-
breaker input and output.
The chamber is made up of the following elements :
Mark Component Information
(1) Envelope Can have a long creepage
distance, depending on the
pollution level.
(2) Fixed contact
(4) Moving contact It is worked by the operating
mechanism and contains the
blasting device.
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