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PF-421 TRMS
Automatic phase switch with
the adjustable lower and upper
voltage threshold
The PF-421 automatic phase switch is used to maintain the con-
tinuity of the power supply of a single-phase receiver in case of
phase failure or when the phase exceeds preset parameters. The
compact size of the device allows you to save space in the elec-
trical cabinet.
By measuring the RMS value of the voltage (True RMS),
the switch guarantees the correct operation even when
operating with a severely disturbed power supply net-
work.
A three-phase voltage (3×230 V+N) is connected to the input ter-
minals of the device. A single-phase voltage (230 V) of one of the
phases appears at the output of the relay. The electronic circuit
of the switch controls the voltage values of the supplied phases
so that the output voltage is not lower or higher than the set
Purpose
Functioning
F&F Filipowski sp. j.
Konstantynowska 79/81, 95-200 Pabianice, POLAND
phone/fax (+48 42) 215 23 83 / (+48 42) 227 09 71
www.fif.com.pl; e-mail: [email protected]
Do not dispose of this device in the trash along with other waste!
According to the Law on Waste, electro coming from households free of charge and can
give any amount to up to that end point of collec� on, as well as to store the occasion of
the purchase of new equipment (in accordance with the principle of old-for-new, regar-
dless of brand). Electro thrown in the trash or abandoned in nature, pose a threat to the
environment and human health.
Summary of Contents for PF-421 TRMS
Page 4: ... 4 Time courses Without the priority phase ...
Page 5: ... 5 With the priority phase ...
Page 10: ......
