Excellent device for converting truck cab 24v electrics to 12 v electric for use with car stereos, CB radio's and other equipment.    Also useful for the habiat power systems.  I generally use 2 of these in a truck cab.  1 supplies a constant power supply for things like car stereo memory and can supply a sub, and the other for a switched power supply.
 
Matt
 
Remote on-off connector
The remote on-off eliminates the need for a high current switch in the input wiring. The remote on-off can be
operated with a low power switch or by the engine run/stop switch (see manual).
All models with adjustable output can be paralleled to increase output current
Up to five units can be connected in parallel.
Easy to install
Delivery includes four Insulated Fastons Female Crimp 6.3mm
Technical Data
Input voltage range (V) 18-35
Under voltage shutdown (V) 14
Under voltage restart (V) 18
Output voltage adjustable with potentiometer yes
Output voltage (V) Adjustable 10–15V F set 13,2V
Efficiency (%) 96
Suitable to buffer-charge a battery yes
Can be connected in parallel yes
Continuous output current (A) 25
Max. Output current (A) 35
Fan assisted cooling (temp. controlled) no
Galvanic isolation no
Off load current < 15mA
Remote on-off yes
Operating temperature range (derate 3% per °C above 40°C) -20 to +55°C
DC connection Faston tabs 6.3 mm
Weight kg 0.7 (1.55lb)
Dimensions hxwxd in mm 65x88x160
Standards:
Safety EN 60950
Emission EN 61000-6-3, EN 55014-1
Immunity EN 61000-6-2, EN 61000-6-1, EN 55014-2
Automotive Directive ECE R10-4