PSR400 – Phase

The PSR relay detects the exact sequence of the phases in three-phase systems and the unbalance of the voltages caused by the decrease or lack of a phase. This device is applied in all those cases in which it is indispensable to respect the phase sequence during the installation or prevent high oscillations of the power supply voltage in the network.


•The output relay energises with a delay of 2 s only if all three phases are present and their sequence corresponds to the initials on the input terminals

• In operating status the output relay de-energizes if the sequence of the phases is altered, if one phase is missing or if the voltage balance between the phases goes below the set asymmetry threshold

• The sensitivity of the relay can be set between 70 % and 95 % of the nominal value

• The restoring by hysteresis is automatic after re-establishing the normal power supply conditions or after removing the sequence error

• 2 DIN module

Technical Data:

•  Power Supply: 400V AC (-20 ÷ +10%)

•  Output: 16A / 250Vac (resistive load) 24V DC

•  Dimensions: 1 Din module (17.5mm)

•  Frequency: 50Hz

•  Absorption VA (W): 4 (3)

•  Timer Range: t1: 0.1s -100 days t2: 0.1s – 1s

•  Temperature Range: 0°C to +55°C

•  Output:

– Relay capacity with change-over contact at 250V AC  8A

– maximum switchable voltage in 380V AC

– maximum switchable current in  10A AC

– maximum switchable power in AC  2000 VA


Order Number: VP807200