Monitoring relay VRSF3, VRSF3N

• This unit monitors the voltage levels and phase sequence of a threephase supply and operates a relay if any phase voltage goes below a
set level or if the phase sequence (L1, L2, L3) is incorrect. A front panel
control allows selection of minimum voltage level. LEDs indicate power
on and trip status.
• Versions are available to suit 3-wire, 3ph (VRSF3) and 4-wire, 3ph+N
(VRSF3N) supplies of 110V, 220V and 430V nominal. The 110V and 230V
versions occupy a single module width on the DIN rail and have a single
relay contact whereas the 430V version occupies a three-module width
and has two relay contacts.
• These instructions contain important safety information. Please read
them thoroughly before commissioning, operating or maintenance of
the unit.