The 40 AMP Solid State Relay has no contacts so it is not affected by vibration like mechanical relays. This DC output relay feature MOSFET technology for low on-state resistance for current switching of 40 AMPS. It will run most all nitrous solenoids.
Standard Single Pull Double Throw (SPDT) relays are rated at 35 AMPS (NO) / 20 AMPS (NC) and have a wide temperature range: -40°C to 125°C. The High current path is fully welded which reduces heat buildup under a full load.