... -in test · Protection: Short circuit/ Over load / Over voltage · Cooling by free air convection · Fixed switching frequency ... Protection type: Shut down o/p voltage, re-power on to recover · Over Voltage: 115%~135% ... Protection type: Shut down o/p voltage, re-power on to recover 3)ENVIRONMENT · Working Temp., Humidity ... 5, 6, 8, 11; ENV50204, EN55024 5)OUTPUT · Model: SKS-150-5 SKS-150-9 SKS-150 ...