Specifications

Mobility and Logistics, Traffic Solutions
Sopers Lane, Poole, Dorset, BH17 7ER
Security classification Unrestricted Page 20 of 83
Version 2 Status Released
Last Editor Harry Smyth Date 09/12/2014
Document Name Configuration Control Document No. 667/CC/45950/000
Copyright © Mobility 2014. All Rights Reserved. Mobility is a division of Siemens Plc
3.4 Master Switch Assembly
The Master Switch Assembly forms part of the Outercase, chosen from Table 1 and
therefore should not be ordered separately. As shown in Figure 2 the Master Switch
Assembly occupies a position in the bottom right hand corner of the ST950 Controller.
With reference to Figure 5, the mains supply voltage is applied to the main ON/OFF 63A
Switch, within the Master Switch Assembly, for onward supply to the ST950 Traffic
Controller.
The live connection is taken from the main ON/OFF 63A Switch and applied to a 45A main
controller fuse unit; the neutral is applied to a neutral terminal. The output from the fuse unit
is applied to a mains filter, as shown in Figure 5, for onward distribution to the Mains
Distribution Unit.
The ST950 LED has a modified Master switch assembly with a Master fuse rating of 20A
this must not be replaced by a fuse of larger rating.
An additional output is taken from the main fuse unit and supplied a 6A Mini Circuit
Breakers. This additional mini circuit breaker provides a controller working supply, typically
utilised to provide power to an OTU.
The neutral connection for the mains filter unit is taken from the neutral terminal, also
detailed in Figure 5.
Figure 5 – Master Switch Assembly
6A Mini
Circuit
Breaker
Neutral
Terminal
Main
Controller
Fuse unit
63A Mains
ON/OFF
switch
Mains
Filter