The 326 B 4RT from FIRST SwitchTech is a Space Qualified Solid State Relay with Bounce Time 1 ms, Coil Resistance 112 to 450 Ohms, Contact Voltage 28 V, Drain Power Voltage 12 to 29 V, Drop out Voltage Before Life : 150 mV, After Life : 175 mV. More details for 326 B 4RT can be seen below.