Lighting Dimmers

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interVOLT SLD Mini Series electronic lighting dimmers are an innovative solution to an age old problem. The dimming of DC lighting circuits at an affordable price has always been an issue. The SLD Series overcomes this with an innovative design packed with features to ensure reliability, longevity and safety. Housed in interVOLT’s new Mini Series enclosure which is not only stylish but compact, efficient and installer friendly. Designed for any 12 or 24 Volt application where dimming of DC operated filament lamps is desirable including boats and yachts, motor homes and caravans, buses and coaches.

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Unique to interVOLT, is the self diagnosing electronics. This design provides valuable feedback to installers and operators alike. An LED displays the system status and will indicate standby power, lamp load connected (lights on), over temperature and output short circuit.

interVOLT dimmers feature a host of devices designed to protect the electronics from various connection and application problems. The dimmers are protected against, short circuit, over temperature and an internal fuse protects the electronics in the event of component failure.

All interVOLT dimmers have an integrated device which stores data for various functions including the memory feature.  The memory function records the current ‘brightness’ setting when the lights are switched off, so that same ‘brightness’ is resumed when turned on again.

Soft Starting
A special feature of interVOLT dimmers is the soft start function. High inrush current diminishes the life of common filament lamps.  This feature controls the start up power by limiting the in-rush current, considerably extending the bulb life.

An innovative feature of our dimmers is the temperature failsafe mode.  Most electronic dimmers either fail or shutdown on temperature overload.  interVOLT dimmers are programmed to dim the lighting circuit to 50% of full load if the electronics should overheat.

Parallel Connection
Another innovation is the master/slave function.  Each interVOLT dimmer is in itself a dual purpose device.  Rather than purchasing individual master and slave units the interVOLT dimmers can be made into either by simply using the master/slave slide switch.


Model No. SLD2040DC SLD2550DC
Continuous Load Rating @ 30°C (86ºF) 200 Watts @ 13.0VDC or

400 Watts @ 26.0VDC

250 Watts @ 13.0VDC or

500 Watts @ 26.0VDC

Length Overall 120mm (4.725”) 170mm (6.690”)
Width Overall 80mm  (3.150”) 80mm  (3.150”)
Height Overall 40mm (1.575”) 40mm (1.575”)
Weight 250 grams (8.80 oz) 350 grams (12.35 oz)
InputVoltage Range 9 – 33VDC
Dimming Voltage Range 10– 98% of input voltage
Standby Current Draw <10mA
Operator Single pole momentary push switch (normally open). Multiple switches can be used.
Operating Temperature -25°C to + 45°C
Operating Humidity Ideally less than 90%
Enclosure Material Marine grade aluminium dye anodised
End Cap Material Injection moulded electrical grade ABS/PC plastic
Terminal Cover Material Extruded temperature resistant ABS
Diagnostic Indicator Tri-colour LED – monitoring standby mode, load on, short circuit and temperature
Transient Voltage Protection Filtering – Purpose designed circuit
Short Circuit Protection Current sensing circuit –  Shutdown (automatic reset)
Over Temperature Protection Temperature sensing circuit – Foldback to 50% of rated load (automatic reset)
Output Circuit Configuration Common negative wiring (switching positive) for ease of installation
Termination Power – 6-32 UNC H/D screw terminal.  Auxiliary – Euro terminal block
Master/Slave Selection Use selectable slide switch.  Located next to auxiliary terminal
Conformity EMC – Australian AS2064 and European EN50081-1 / EN50082-1
Certification EMC – Australian C Tick mark and European CE mark