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ISR4204 Delayed Staging Relay

Stand-alone / Controlled Output Devices

The Innotech range of ISR delayed staging relays are designed for applications requiring a 0-10V DC control signal with an adjustable time delay to control up to four stages of heating, cooling or fans used in air conditioning and associated systems where the on/off voltages need to be customised.


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  • Independently adjustable Ramp UP and DOWN times.
  • LED indication of ramping direction.
  • Relay ON/OFF voltages independently and accurately adjustable from 0 to +10V DC.
  • Field selectable Direct/Reverse Acting.
  • LED indication of relay status.
  • The Innotech enclosure saves space and cuts installation time.