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ZIEHL industrie-elektronik, 74523 Schwäbisch Hall, Germany, +49 791 504-0, info@ziehl.de, www.ziehl.de
Voltage Monitoring Type SW
2
Modern electrical switchgear for
energy generation and distributi-
on, for treatment and processing
machines and for a variety of
other drives are usually equipped
with measuring and control-
engineering devices.
However, the use of such devices
demands that the supplied mains
voltage deviates only slightly from
the nominal value as otherwise
the required accuracy of the
measurements or the actuating signal is not attained,
or downstream units are destroyed by overvoltage.
SW series voltage monitors from ZIEHL are used to
monitor the mains voltage in direct, alternating and
three-phase current networks for undervoltage and/or
overvoltage. If the nominal voltage deviates by various
values which, depending on the consumer, are not
allowed to be undercut, the involved system needs to
be disconnected, or at least the operator needs to be
optically or acoustically warned.
When the mains voltage is ap-
plied, the integrated relay picks
up if the voltage value preset
for the network to be monitored
is not undercut. If the set limit is
undercut, the relay releases.
Type SW voltage monitors com-
ply with Class III acc. VDE 0435
Part 303, Para. 4.8.2, for static
measuring relays (SMR).
Undervoltage monitors (↓) for
three-phase current networks
with N and alternating voltage
networks. The switching point lies
at approx. 80% UNom. Hysteresis
is approx. 5%. The voltages of the
3 phases are measured against
the neutral conductor.
A green LED indicates the unit
is ready for service. During un-
dervoltage (<80%), the relay (2
change-over contacts) releases
and the green LED goes out.
The housing can be snapped
onto 35 mm mounting rails and
is perfectly suited for installation
in distribution cabinets.
Voltage Relay for three-phase current
also for alternating current networks
AC 230 V, +10...-30%, < 5 VA
50/60 Hz
2change-over contacts
Type 2 see "general technical informations"
see "general technical informations"
-20°C...+55°C
approx. 5% UNom
L1/N: ca. 400 ms, L2/L3: ca. 1 s
Design V2: 90x35x58 [mm], mounting height 55 mm
IP 30 / IP 20
Rated Supply Voltage Us
Frequency
Output Relay
Type of contact
Test conditions
Rated ambient temperature
range
Hysteresis
Delay relay, undervoltage at
voltage breakdown
Dimensions H x W x D
Protection housing/terminals
Technical Data
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2012-05-30
Features:
Monitoring three-phase current networks 3 AC 400 V
with neutral conductor
Monitoring alternating current networks AC 230 V
(connect inputs L1/2/3)
Monitoring own power supply
Switching point xed 80 %
Output relay 2 change-over contacts
Panel mounted housing, 35 mm wide
K11
K12
K13
K14
L1
L2
L3
N
READY
ALARM
K1
L1
18 15 16 28 25 26
N
11270-1201-00
Spannungsrelais
SW31V
L2 L3
.com
SW31V
Part number:
S222281 AC 230 V