Reliable
Backed by SEL’s ten-year warranty, the SEL-9331 is designed and tested to operate in environments with extreme temperatures, shock, and vibration. With no vent holes, fans, or moving parts, the SEL-9331 provides reliable zero-maintenance operation. Multiple Mounting Options
The SEL-9331 can be easily mounted to a panel or DIN rail.Redundancy
Two SEL-9331 outputs can be connected in parallel to provide a backup power supply in case one source fails. Power Factor Correction
Minimizes reactive power and induced harmonics for improved efficiency of ac power systems. Reverse-Polarity Protection
Protects against damage in the event that input wiring is accidentally reversed. Autorecovery From Undervoltage
Undervoltage lockout prevents misoperation during brownout conditions. Short-Circuit Protection
Prevents damage caused by excessive load.Reverse-Current Protection
Prevents reverse-current flow caused by an overvoltage condition on the output.Power Good Indicator
The standalone power supply features a “power good” LED to indicate when the SEL-9331 is operating normally. When installed in an SEL-3355, the power supply can be monitored by the SEL System Monitor and Microsoft Windows performance counters.Conformal Coating (optional)
Conformal coating of the circuit board provides an extra level of protection in corrosive environments.