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Instruction Manual

Time Delay Switch-Two Wire

CAT XLTD770/1 & TD170/1

1 Specifications (at 25°C)

2 Features

Supply voltage

230-240V a.c. 50Hz

Selectable time delay

1, 3 or 10 minutes

Max and min load 

See table below

Weatherproof rating

IP56 (TD170/1 only)

Operating temperature

0 to 50°C

Tube Size

Effective Load

Tube Size

Effective Load

1 x 15W

85VA

1 x 65W

170VA

1 x 20W

85VA

1 x 80W

210VA

1 x 30W

85VA

2 x 20W

185VA

1 x 40W

105VA

2 x 40W

210VA

Load type

Min Load

Max Load

Incandescent and
240V linear halogen

20W

600W

240V GU10 halogen downlights

Not suitable*

Compact fluorescent

150W**

600W

Linear fluorescent
(Electronic ballast)

150W**

600W

Linear fluorescent
(Magnetic ballast with power 
factor correction)

40W***

600W***

Linear fluorescent
(Magnetic ballast without power 
factor correction)

100VA****

600VA****

Low voltage halogen
(Electronic transformer)

20W

600W

Low voltage halogen
(Magnetic transformer)

20W

480W

Fan motor

20VA

600VA

 GU10 240V halogen downlights can damage the time delay switch when they fail, and are therefore not recommended for use with 

this product.

**   Compact and linear fluorescent lamps may flicker in the “off” state if the minimum load requirement is not satisfied. A minimum 

load of 10W can be achieved if a resistive load is connected in parallel with the fluorescent load. This can be, for example, a resistor 

or incandescent lamp rated at least 10W.

***   Power factor correction capacitors must be placed on the line side of the time delay switch. If this is not possible then they should 

either be removed, or a 36W magnetic ballast should be connected in parallel with the fluorescent load, to prevent damage to the 

time delay switch.

****   Refer to the following table for VA ratings when power factor correction is not used:

•  

Selectable time delay

 

Choose from a 1, 3 or 10 minute delay period 
using the switch on the back of the unit.

•  Direct replacement for pneumatic switches 

No change in wiring is required.

•  Multiple push buttons 

Connect NX770M remote push buttons 
as shown in the wiring diagram to enable 
switching from several locations.

•  Illuminated push button 

Push button glows red when unit is off, so 
that it can easily be located in the dark. Not 
available for remote push buttons.

•  Weatherproof (TD170/1 only) 

Rated IP56.

•  Ease of installation 

XLTD770/1 and TD170/1 fit all standard 
mounting accessories.

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