Module Type; Circuit Breaker Module; Disconnecting Module; Switch-Disconnector Module - Siemens NXAirS Manual

NXAirS Withdrawable Metal-enclosed Switchgear, Rated Voltage Up to 12kV
NXAirS description
6. Module type
NXAirS consists of various module types which can be freely combined according to the requirements.
The following module types are available:
Circuit-breaker module
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Disconnecting module

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Metering module

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Switch-disconnector module

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Busbar sectionalizer
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6.1 Circuit breaker module
The Circuit-breaker module is the basic module type of NXAirS. The circuit-breaker module panel NXAirS can fulfill
the function of "outgoing feeder" or"distribution". It can carry or switch on/off all the rated currents and short-circuit
currents specified on the respective rating plates.
Basic components
Busbar
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Breaker module panel SION
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Low-voltage plug connector with interlock between SION module and panel
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Mechanism box of control cable
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Option Current transformers
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Fixed Current transformers
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Disconnection truck with lower PT
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Make-proof earthing switch
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Connection compartment with arresters
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Connection compartment with over-voltage protection device
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Motor-driven earthing-switch
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6.2 Disconnecting module
The disconnecting module panel is an additional module to the basic module. It's used to carry electrical power. It can
not switch on electrical power. The withdrawable part in the disconnecting module NXAirS is therefore protected by a
padlock against arbitrary operation (standard construction).
Basic components
Busbar
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Disconnecting module panel
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Low-voltage plug connector with mechanical interlock between module and panel
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Mechanism box of control cable
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Option Current transformers
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Fixed Current transformers
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Make-proof earthing switch
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Connection compartment with arrester
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Connection compartment with over-voltage protection device
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6.3 Switch-disconnector module
The Switch-disconnector module is used to switch on the station transformer, and it is equipped with fuses to protect
the transformers. Degree of continuity: LSC 2A
Basic components Busbar
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Fixed Switch-disconnector
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Low-voltage plug connector with mechanical interlock
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Mechanism box of control cable
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Current transformers
Option
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Make-proof earthing switch
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6.4 Metering module
The metering module with PT is used to meter busbar voltage
Basic components
Busbar
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Withdrawable module
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Low-voltage plug connector with mechanical interlock
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Optionally, can be with 3 PT installed, and can be with fuse installed or not
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