Twilight Switch – Metal Enclosure

Model :   STM 105

Twilight Switch offered by ESPL switches the lights ON only when they are actually required.

Twilight Switch works on Twilight principle which automatically switches the lights ON in the evening upon sensing darkness and switches the lights OFF in the morning after sensing daylight. Hence Lamp is ON only when it is required resulting in considerable saving in electricity cost and optimal electricity consumption.


  • NPN, PNP or Both outputs
  • Multiple ranges available as required
  • LED indication for output status
  • Non Critical alignment between the Sensors
  • Available in M 18 Brass Plated Housing
  • Also available in ABS Plastic Housing

Product Variants

IRB 031 / 032 NPN – NO or NC selectable 03 Meters
IRB 033 / 034 PNP – NO or NC selectable 03 Meters
IRB 101 / 102 NPN – NO or NC selectable 10 Meters
IRB 103 / 104 PNP – NO or NC selectable 10 Meters
IRB 201 / 202 NPN – NO or NC selectable 20 Meters
IRB 203 / 204 PNP – NO or NC selectable 20 Meters
IRB 301 / 302 NPN – NO or NC selectable 30 Meters
IRB 303 / 304 PNP – NO or NC selectable 30 Meters


Power Supply 220 Volts AC through Terminal strip
Output Through Potential free relay contacts C – NO
Sensor Sensor in separate housing
Output 600 Watt Maximum
Sensitivity Provided inside the unit
Bypass Switch  Provided for Manual over-ride
LED Indication For Power and Output
Suitable for Tubelight / Bulb / CFL
Housing Powder coating metal box
Dimension 155 x 125 x 55mm


  • For Height based GO-NO-GO systems
  • Object detection on Conveyer Belts
  • As Safety Barriers for various machines
  • For Safety barrier for Sliding gate of boom barrier
  • For Safety applications in Paper Cutting Machines
  • For Level sensing in Hoppers



Additional information


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Demo Video


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