Standard switch

for aircraft

Airfield Lighting Systems single switching unit for switching individual lighting fittings. Widely used for stop-bar control. The ALS SSU is available in either Fail-On or Fail-Off versions. The ALS SSUs enables the suppression of any LED or incandescent lamp from 1W to 100W that uses a 6.6A supply down to 1A. The SSU is also available in the form of a combined switching transformer with both items cast in the same encapsulated unit. Features Encapsulated in a homogenous high quality polyurethane resin Uses 31% less energy than other switching devices when the lamps are suppressed Current ramping as standard, gives longer lamp life Interchangeable with any other manufacturers’ lamp suppression unit Available in Fail-On and Fail-Off versions 12hr minimum water testing prior to despatch Ambient temperature range -20°C to +55°C Resistant to acid and alkaline soils, oils, fuels and de-icing fluids Materials used are also termite and rodent proof IP rating equivalent to IP68 Specification Switching signal to transformer secondary isolation voltage of 2500V AC SSU Control signal cables 2 core, 2.5mm² Current to the lamps is ramped up and down more slowly than the regulator changes its firing angle (150ms) Maximum rms voltage of 33V when open circuit Applications Military or civil airport constant current circuits. Taxiway routing Stop Bar control Options 2 pin plug and socket control leads