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light switch will fail to operate. Always 
disconnect power before replacing the bulb
by pulling the fuse carrier “A” until the fuse
is fully visible. It may be necessary to replace
the fuse if the switch does not operate when
the carrier is pushed back into position 
following bulb replacement. There is a slot in
the base of the carrier which allows the old
fuse to be pushed upwards and removed.
In order to ensure that the set programmes

do not overlap, it is advisable to plan 
beforehand, using the table below.

e.g. First programme will be set to come on
at 8.10pm until 11.06pm everyday.

ALWAYS REPLACE WITH A SPECIAL 3AMP

BS646 FUSE. (THIS IS NOT AN ORDINARY

3AMP FUSE)

P L E A S E   K E E P   T H E S E  

I N S T R U C T I O N S   S A F E   F O R

F U T U R E   R E F E R E N C E

GreenBrook Electrical Plc
7 Astra Centre
Harlow
Essex
CM20 2BG
E mail [email protected]
Web page www.greenbrook.co.uk

Issue number 300900/B

ON    OFF

TIME  TIME MO TU WE TH   FR  SA  SU

e.g PROG 1  20.10 23.06  X    X    X    X    X   X    X

PROG No 2

PROG No 3

PROG No 4

PROG No 5

PROG No 6

MODEL NUMBER: T40S 

A. FUSE CARRIER Pull out to replace                                    

fuse (a special 3A BS646, this is not an ordinary 
fuse)

B.

LCD DISPLAY

to G: BUTTONS TO SET DAY, TIME     
AND PROGRAMME AND RANDOM

H. PUSH ON/OFF SWITCH ALLOWS UNIT 

TO OPERATE AS ORDINARY LIGHT 
SWITCH ACTIVATES EVEN WHEN LID 
IS SHUT.

L.

OVERRIDE SWITCH
MAN = MANUAL MODE
AUTO = AUTOMATIC PROGRAMME MODE

J.

RESET BUTTON

K. RED NEON LIT IN AUTOMATIC MODE

IF IN DOUBT, INSTALLATION SHOULD 

BE MADE BY A QUALIFIED 

ELECTRICIAN IN ACCORDANCE WITH CURRENT WIRING

REGULATIONS

Before attempting any installation work turn off
the electrical supply at the mains switch, fuse box or
consumer unit and for additional safety remove the
fuse.
GreenBrook security wall light switches 
cannot be used with other electronic products.

1.

After installation, the internal back up 
battery will need to be fully charged to 
enable correct operation. 

2.

After the mains supply is switched back on, 
wait 5 minutes and operate the reset 
button and allow the internal battery to 
charge for 45-60 minutes. After this 
period follow the operating instructions 
as normal.

3.

DO NOT use in two-way systems with 
dimmers or any other switch containing 
electronic circuitry.

4.

DO NOT use with fluorescent strip lights 
or low energy compact fluorescent lamps.

5.

DO NOT use with low voltage lighting.

6.

ONLY SUITABLE for most tungsten 
filament lamp loads of 40 to 400W.

7.

Not suitable in 3-way circuits.

NOTE

If using a metal backbox this should be 

earthed.

YELLOW & GREEN EARTHS MUST REMAIN 

CONNECTED TO METAL BACK BOX

Before installing your Security Wall Light Switch in a
two way circuit, it is first necessary to determine
which method of wiring has been used in your
home.
The primary reason for doing this is to make sure
that the switch is wired in such a way that has a
permanent live feed at all times in order to power
the electronic timer.
1. TURN OFF THE MAINS SUPPLY
2. Loosen the two switch plates from the wall.
3. Do NOT disconnect any wires at this stage.
4. Study the existing wiring arrangement; 

compare to the ‘before’ illustrations.
-If you find 3 wires at each switch 
(excluding the earth wire) see Diagram 3.
-If you find 5 wires at one switch and 5 
wires at the other (excluding the earth 
wire) see Diagram 5.

After establishing the appropriate wiring 
method, install the security light switch as 
per the corresponding ‘after’ illustration.

YELLOW & GREEN EARTHS MUST REMAIN

CONNECTED TO METAL BOX

INSTALLATION/OPERATING

INSTRUCTIONS FOR T40S

ELECTRONIC WALL

SWITCH TIMER

WIRING INSTRUCTIONS

WIRING INSTALLATION IN ONE

WAY SWITCHED CIRCUIT

PROGRAMME PLANNER

WIRING INSTALLATION IN

TWO WAY SWITCHED CIRCUIT

3 Wires in both switches

Timer installed at 
live wire end only

Diagram 3

Diagram 4

BEFORE

AFTER

C

C

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