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The most important feature of this time switch is that it has been designed
to combine the requirements of a large range of switching applications.
This is a small synchronous switch particularly suitable for street lighting control. The switch is of the
plug-in type, the mechanism being enclosed in a neat all insulated moisture proof base and cover of moulded
bakelite. The base forms the plug receptacle, incorporates a wiring diagram and for
added safety an earthing terminal. The switch will plug into standard street lighting post boxes, a feature of the base being that it
also forms the plug receptacle and thus eliminates the need for a separate terminal block. It is rated at 10A for
250V. The standard day dial is interchangeable with the solar dial on site, allowing the switch to be readily
adapted for a wide range of other applications. The switch can also be supplied with a day omitting device and
with an external manual operation feature. The day omitting device can disable whole sequence of
operations for any day or days of the week. The solar dials are designed for different latitudes and
settings can be made up to three-quarters of an hour on either side of normal sunrise and sunset times to
compensate for longitudinal variation. It is housed in a mosture-proof bakelite housing, is a plug-in unit,
has a day-omitting device and an external manual operating device, and has the added benefit of being an
all-enclosed mechanism. The switch is simple and robust in construction and is
thoroughly tested before despatch to ensure its accurate and reliable performance. The standard day
dial is fitted with one "On" and one "Off" level with which settings can be made for minimum periods
of 20 minutes between operations. Extra levers up to three "On" and three "Off" with similar mininum
intervals between settings can be supplied. Solar dials are designed for four different latitudes. By
removing a retaining screw and reversing the time pointer in its setting, the day dial can be interchanged
with the solar dial on site. All live parts are totally enclosed when the mechanism is fitted in the base.
The "SS" time switch is supplied in several forms and is suitable for lighting, heating and power circuits. All
switches are supplied as single-pole, single-throw types and the 24-hour dial and solar dial switches are also available
with single pole, double-throw change oever contacts. A day omitting device to cut out operations on any predetermined
day or days of the week may be fitted.
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SS
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Electrical Time Switch
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Single pole single throw 10A load at 250V maximum.
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1937 Journal
1937 Advert
1938 Advert
1938 Advert
1938 Journal
1938 Advert
1938 Advert
1939 Advert
1946 Programme
1947 Advert
1947 Programme
1947 Journal
1947 Advert
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SSA
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Electrical Time Switch
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Single pole, single throw. Rated at 10A. 24-hour dial with one "off" and one "on" lever. Fitted with
a day omitting device.
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1945 Programme
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SSC
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Electrical Time Switch
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Similar to SSA but fitted with a Solar Dial.
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1945 Programme
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SSE
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Electrical Time Switch
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Similar to SSG but fitted with a Solar Dial.
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1945 Programme
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SSF
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Electrical Time Switch
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Similar to SSH but with solar dial.
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1945 Programme
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SSG
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Electrical Time Switch
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Similar to SSH but with day omitting device which operates on one circuit only.
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1945 Programme
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SSH
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Electrical Time Switch
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Single pole, double throw changeover switch. Rated at 10A. 24-hour dial. One circuit is on at all
times. Up to three pairs of levers can be fitted.
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1945 Programme
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SSJ
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Electrical Time Switch
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Single pole, singe throw switch. Rated at 10A. 1-hour dial. Settings can be made
for minimum periods of one minute between operations. Up to three pairs of levers
can be fitted.
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1945 Programme
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SSK
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Electrical Time Switch
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Single pole, singe throw switch. Rated at 5A. 1-hour dial. Settings can be made
for periods between five and thirty seconds. Up to twelve operations at five-minute
intervals are possible.
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1945 Programme
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SSV
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Electrical Time Switch
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Similar to SSK except that the contacts break for the short period.
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1945 Programme
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