The PHL 50A 48 from FIRST SwitchTech is a Space Qualified Solid State Relay with Bounce Time 2 ms, Coil Resistance 27 to 425 Ohms, Contact Voltage 28 Vdc, DC Coil Voltage 12 to 48 V, Drop out Voltage Before Life : 125 mV, After Life : 250 mV. More details for PHL 50A 48 can be seen below.