Automatic Phase Selector with Adjustable Voltage Thresholds PF-421-TRMS

Automatic Phase Selector with Adjustable Voltage Thresholds PF-421-TRMS

The PF-421-TRMS automatic phase selector ensures uninterrupted power supply for single-phase loads connected to a three-phase 3×230 V + N system. When voltage on the active phase exceeds the set upper or lower limits, the unit automatically switches to another phase with correct voltage parameters.

Thanks to adjustable voltage thresholds, precise measurement, and reliable relay control, PF-421-TRMS guarantees stable operation of sensitive electrical and automation systems.

Technical specifications:

• Power supply: 3×230 V + N

• Minimum operating voltage: 85 V

• Maximum phase voltage: 420 V

• Frequency: 45 – 55 Hz

• Max load current (AC-1): 16 A

• Output element: 3×relay

• Return hysteresis: 10 V

• Vmin setting range: 160 – 220 V

• Vmax setting range: 240 – 280 V

• Voltage measurement error: ±1 %

• Sampling frequency: 4 kHz

• Switching time: ≤ 200 s

• Return delay: 5 – 300 s

• Power consumption: 1.5 W

• Operating temperature: –25 °C to +50 °C

• Connection: screw terminals 4.0 mm²

• Torque: 0.5 Nm

• Mounting: DIN rail TH-35 (2 modules / 35 mm)

• Protection degree: IP20

• Input voltage indication: 3×LED

• Generator compatibility: no