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Borna Electronics Co
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  5. Model LST - Time Lag Switch (Miniature)

Model LST -Time Lag Switch (Miniature)

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This device is designed for energy saving and lamps durability. It is not economical to apply simple on/off switches in many apartments and corridors in energy saving point of view because, they should be turned off again several minutes after they get ON. By use of timer type LST, one can turn on the lights by a switch press. Then at the end of adjusted time, the device turns off the lights automatically.

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Type: LST

  • Energy saving
  • Lamps durability
  • Adjustable time from 1 to 7 minutes
  • Usable for fluorescent or incandescent lamps
  • Input supply of 220 VAC
  • Output current of 10A (20 incandescent lamps of 100 W)

Two wire Cabling:

  • Network phase and null have to be connected to terminals PH and MP respectively.
  • All the lamps have to be put in parallel together and connected from one side to network null and the other side to terminal COM.
  • All the press switches (push-buttons) have to be put in parallel together and connected from one side terminal PH and the other side to terminal COM.

  • Apply this method in apartments with just a single phase.
  • Network phase and null have to be connected to terminals PH and MP.
  • All the lamps have to be put in parallel together and connected from one side to network null and the other side to terminal COM.
  • All the press switches (push-buttons) have to be put in parallel together and connected from one side phase and the other side to terminal COM.
  • Attention: Definitely, use a 10 A miniature fuse in the course of phase line, to make sure of cabling and protect short circuit.
  • After wiring, PWR signal gets ON upon energization. Every time after pressing lamps` push-buttons, OUT signal gets ON and at the end of time adjusted by DELAY potentiometer handle, OUT signal and lamps would be turned off.
  • In one model of staircase timers, a key is considered. This key has two modes.
  • If key is in Timer (T) mode, lamps would be turned off after adjusted time. If key is in Cont. (C) mode, timer gets out of circuit and by pressing lamps` push-buttons, lamps stay ON and do not get OFF. Then, to turn the lamps off, the key should be placed in (T) position.
  • Network Voltage: 220 VAC
  • Network Frequency: 50 or 60 Hz
  • Internal Loss: About 3 W
  • OFF Delay: 1 to 7 Minutes, adjustable by DELAY potentiometer handle
  • Contact Current: 10 A
  • Contact Power: 2000 W (20 incandescent lamps of 100 W)

All other technical specifications available upon request