R&B Switchgear, in recognising our customers needs to support old and obsolete circuit breakers on
site, have designed
a Vacuum Retrofit (AREVA CLX3) for the 3.3kV / 6.6kV Lawrence, Scott& Electromotors Motor Switching Device.
The retrofit consists of installing a AREVA CLX3 Vacuum Contactor within the existing
Lawrence,
&Electromotors carriage.
All main interlocks have been retained in the modification to prevent the retrofit being installed or
removed from
the switchboard whilst in the closed position. By carrying out the retrofit in this way it
alleviates the
necessity
to modify the main switchboard busbars etc. This method, in our opinion
is by far the most cost effective
solution for upgrading the switchboard on site to guarantee future
support and reliability for many years to come.
As part of the Retrofit package, customer’s drawings are updated on CAD to contemporary standards
producing standard drawings for each circuit type.
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Technical Data Vacuum Contactor Type Areva CLX3
Standard: IEC 60470(2000)
Rated Operational Voltage: 7.2kV
Rated Insulation Voltage: 7.2kV
Rated Frequency: 50/60Hz
Rated Operational Current: 400A
Maximum Fuse Size: 450A
Rated Interrupting Capability
Of Fuses: 43.8kA
Contactor Rated Thermal Current: 400A
Contactor Rated Making Capacity
BS 775 Cat. AC4 cl.3: 4.0kA, 7.2kV, 0.23pf
Contactor Rated Breaking Capacity
BS 775 Cat. AC4 cl.3: 3.2kA, 7.2kV, 0.23pf
Contactor Max. Interrupting Capacity: 4.4/8.8kA
Contactor Short Time Overload Capacity: 6.0kA 1 sec
