Siemens NXAirS Manual page 8

NXAirS Withdrawable Metal-enclosed Switchgear, Rated Voltage Up to 12kV
NXAirS description
7.1 High voltage compartment
Basic features
Contain Circuit Breaker module, switch-disconnector module, disconnection module, or Metering module
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Open door from the left
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Shutters for covering the contacts automatically when the Circuit--Breaker module, Disconnecting module or Metering
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module is taken out from the panel. The shutters can be padlocked separately .The shutter mechanism for the
connection compartment is located on the right inside of the panel. The shutter mechanism for the busbar
compartment is located on the left inside of the panel.
Metallic cable channel is for placing control cable
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Pressure release upwards
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Option There is natural Ventilation on the door of high-voltage compartment for the rated current≥2500A panel
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Motor-driven cassettee
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Heating device
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7.2 Circuit Breaker module SION
Module type
SION is withdrawable module
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Integration construction, with reliable mechanical interlock
Module SION features
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Mechanical switch status indicator on the circuit-breaker
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Reliable interlock between module and panel
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Basic features The drive unit of circuit-breaker
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Separated contacts
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Mechanical interlock
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Interface of mechanical operation
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Low-voltage plug connector with mechanical interlock
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Electric magnet for closing
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Mechanical status indicator of spring
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Primary working current release or tripping coil
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Operation cycle counter
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Indicate device of switch status
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Electrical tripping prevention
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Voltage sensitivity resistance module when the auxiliary voltage>60V
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Option Electromagnetic interlock
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The secondary release
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Low-voltage release
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CT drive release
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Module operation Circuit breaker
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- Circuit breaker can be operated by button or electronic remote controller. The energy for the "open-close-open"
procedure (quick automatical reclose) is stored in the close /opening spring, usually the spring is driven by an electric
machine, which can be replaced by a special tool when the operation voltage is not available. Spring indicator shows
pring status. Switch status indicator shows circuit-breaker status. Counter shows the operation time.
Disconnection function.
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- Circuit-breaker can be pulled from the test position to the service position (or in reverse) with a special tool. The test
position or service position of the circuit-breaker can be observed through an inspection window.
The operation mechanism of the feeder earthing switch.
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- Insert the operation tool in the operation opening and turn to earth the feeder, switch status indicator shows status
of the earthing switch. To avoid wrong operation, there are mechanical interlocks between the different operation
mechanisms.
The following releases send command code to the Interlock mechanism to control the opening and closing of the circuit-
breaker.
Primary and secondary current release (optional)
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