Product Details:

Voltage TypeAC
Voltage (V)220 – 240
Logic3 Phase input and Single (best) phase output
ApplicationHealthy phase selection, Uninterrupted power supply to load
Current (Amps)16A maximum
Contact Form3 x SPDT  Relays
SwitchingUnder voltage, Over voltage, Phase loss, Priority phase

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 and inverter. The maximum and minimum voltage limits are set by user.


Nominal phase voltage, V 230

Operating capability voltage, on single phase, V 120

Mains frequency, Hz 45 – 55

Trip threshold for Umin, V 160 – 210

Trip threshold for Umax, V 230 – 280

Time delay range for return to the priority phase (Tr), sec * 5 – 200

Time delay range of reclosing (Ton), sec 1 – 600

Fixed time delay of switching over (switching off) for Umin, sec 12

Time of switching over to reserve phases, sec, not more 0.2

Hysteresis (reset coefficient) on voltage, V 5 – 6

Accuracy of threshold trip, V ±3

Maximum switched current (cos φ=1) of additional relay output contacts, A 16

Maximum switched current (cos φ=0.4) of additional relay output contacts, A 5

Device operating capability phase voltage, V 400

Short time allowable operating capability maximal phase voltage, V 450

Power consumption (under load), W, not more than 1.2

Protection degree of the front panel IP 40

Protection degree of terminals block IP 20

Climatic version NF 3.1

Electric shock protection class II

Pollution rate II

Category of overload II

Device scope Control and distribution device

Construction type (installation) On standard DIN-rail, 35 mm

Cross-section of connection terminal wires, mm2

0.5 – 1.5

Screw torque of terminal clams, N*m 0.4

Service life of output contacts:

– under load 16 A, operations, not less than 50000

– under load 5 A, operations, not less than 100000

Overall dimensions H*B*L, mm 90.2*36*64.5

Weight, kg, not more than 0.15

The device remains operational capability in any position in space

Housing material – self-extinguishing plastic

* – If knob Тr is in position “” there is no return to the priority phase