The SR 263 uses two, six pole hermetically sealed and gas filled relays to provide a total of twelve poles of switching. Relays are qualified to MIL-R-39016/40.

* Certification: FAA PMA
* Max Pick up Voltage: 18VDC
* Nominal Coil Impedance: 390 W
* Max Contact Rating: 2A @ 28VDC Resistive Load
* .75A @ 28VDC Inductive Load (200mH)
* .25A @ 28VDC Lamp Load