The PEF-320 universal automatic electronic phase switch is designed to supply an industrial and domestic single phase 230 V, 50 Hz load from three-phase four-wire mains 3х400+N in order to maintain uninterrupted power supply of essential single-phase loads and protect them against unallowable voltage variations in the mains. According to the voltage presence and voltage quality on the phases, the PEF-320 will automatically select the optimum phase in limits range set by user and switch the single phase load supply to this phase. It is possible to connect to one of the phases of the electric generator, inverter. The maximum and minimum voltage limits are set by user. TECHNICAL BRIEF Nominal Phase Voltage, V 220 - 240 Mains frequency, Hz 45-55 Harmonical configuration (nonsinusoidality) of power supply voltage EN 61000-3-2 (IEC 1000-3-2) Trip threshold for Umin, V 170-220 Trip threshold for Umax, V 230-290 Adjustable reset delay, Ton, s 1-600 Return delay range to the priority phase, Tr, (5—200), s present Return delay range to the priority phase, Tr, (200 -- ∞), s absent Fixed switch (de-energization) delay for Umin, s 12 Switch delay to reserve phases, s, not more than 0.2 Voltage hysteresis, V 5 - 7 Accuracy, V ±3 Maximum switched current of output contacts, А, no more than 16 Operating phase voltage, V 400 Transient withstand, V 450 Power consumption (under load), W, not more than 1.0 Protection class against electric shock II Permissible contamination level II Overvoltage category II Nominal impulse withstanding voltage, kV 4 Nominal voltage of isolation, V 450 Life of output contacts: under load 16 A , operations, no less than 50 000 under load 5 A , operations, not more than 100 000 Cross section of wires of connection terminals, mm² 0.5-2 Maximal tightening torque of terminals external screws, N*m 0.4 Operating temperature, °C from -35 to +55 Weight, no more than, kg 0.150 Overall dimensions H*B*L, mm 90.2*36*64.5 Mounting 35 mm DIN-rail Mounting position arbitrary PEF-320 complies with requirements: IEC 60947-1:2004, ІDТ; ІEC 60947-6-2:1992, ІDT; CISPR 11:2004, IDT; IEC 61000-4-2:2001, IDT.