20-200ms Timer Circuit for Circuit Interrupter

Discussion in 'General Electronics Chat' started by mizzu, Apr 23, 2010.

  1. mizzu

    Thread Starter New Member

    Apr 28, 2009
    We are in the middle of a test per DO-160F. One test requires that we interupt the 115vac single phase power for 20ms then again for 200ms. Does anyone have a simple schematic and parts to build such a timer/interupter.
  2. SgtWookie


    Jul 17, 2007
    Well, 20mS would be 1.2 cycles at 60Hz. You might switch a TRIAC off at a zero crossing point, and then wait for 1.2 complete cycles to go through, and switch it back on.

    However, DO-160F refers to avionics. Is your source 400Hz 115v AC, as is typical of aircraft? In that case, it would be 8 complete cycles for 20mS, and 80 cycles for 200mS.