Euro Manufacturing and Marketing Limited

UK Manufacturers of Electronic Products for the Automotive Industry

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Safety & Security

Cross Reference LS – 20 – B (3178)

To meet recent legislation, we have designed and developed a Unit capable of Automatically Switching most Vehicle Accessories On at a given speed.

The Unit can be used to suit your particular application or to warn the Driver that the Vehicle has reached a given speed.
Output Current
Switch On Delay (Speed Increasing)
1 second
Switch Off Delay (Speed Decreasing)
< 12ms
Switch point Setting (See Table)
6 Way Switch
(64 Combinations)
Pulse Input
V low < 1.5V
V high > 5.5V
Pulse Duration > 1.5ms
Override Input Resistance
> 5kW to ground
Override Input
Operation normal
< 1V
Output Off
> 4.5V
Output On
Case Style
Din Pack, Vertical bracket
94 x 61 x 45 mm
1 x 6.3mm Hole
Case Material
Black ABS
Bracket Material
Aluminium Alloy

Note: All road speeds assume 4 pulses per metre

The switching on speed is set by selecting a combination of up to

6 switches, giving 64 options between the limits of 2.5km/h (1.6mph) and 102.5km/h (64mph).

The switching on speed can be Factory set or adjusted during installation.

The output on this unit is normally off and switches on at the set speed, it is capable of switching 10A.

The tri state Override input can control the output as follows:

Open = normal operation

Switch to positive = output on

Switch to ground = output off

Note: Pin 1 and Pin 6 should be wired directly to the appropriate Pins on the Tachograph as indicated.

For example on the DTCO 1381 Tachograph:

· Pin 1 of Speed Switch to Tachograph Plug B Pin B8

· Pin 6 of Speed Switch to Tachograph Plug A Pin A6

E1048 12v + 24v Speed Switch