Bender Incorporated 700 Fox Chase, Coatesville PA 19320 Tel.: (800) 356-4266 Fax: (610) 383-7100

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54
Main catalogue part 3 06.2007 / Electronic measuring and monitoring relays
SUD473
Undervoltage or overvoltage relays for 3NAC systems
without external supply voltage
Device features


Undervoltage and overvoltage moni-
toring for 3NAC systems

Without external supply voltage


3 device variants with adjustable
response values
4080 V (3NAC 110V)
80170 V (3NAC 230V)
150300 V (3NAC 400V)

Response delay 0.35 s

Integrated energy backup

TEST button for functional test

LEDs: Power ON, Alarm


Alarm relay with two potential-free
changeover contacts

Modular DIN rail enclosure
Note
In case of new installations refer to
VMD421H.
Approvals
Product description
The voltage relays of the SUD473 series are designed to monitor the voltage of three-phase
AC systems with N conductor. The devices can optionally be used for undervoltage or
overvoltage monitoring. External supply voltage is not required. The response values are
set via potentiometers. An integrated energy backup maintains the power supply for five
seconds.
Typical applications

Monitoring of the power supply of motors and electrical installations

Monitoring of loads

Switching on and switching off at a certain voltage level

Monitoring of stand-by and emergency supply systems

Supply voltage monitoring of portable loads
Function overvoltage (switch U>Y)
When supply voltage is applied, the alarm relay works in N/O operation (relay de-ener-
gized). When the phase-to-phase voltage of one, two or all conductors exceeds the set
response value Y, the alarm relay energizes and the alarm LED ALARM lights up. If the
measured quantity drops below the response value plus hysteresis, the alarm relay swit-
ches back to its original state.
SUD473
3
5
4
2
1
1 -
Response value Y
2 -
Hysteresis Hy
3 -
Alarm relay
4 -
Power ON LED
5 -
Alarm LED
t1 -
Response delay 0.35 s
t2 -
Delay on release 0.5 s
t3 -
Energy backup 5 s
3
5
4
2
1
1 -
Hysteresis Hy
2 -
Response value Y
3 -
Alarm relay
4 -
Power ON LED
5 -
Alarm LED
t1 -
Response delay 0.35 s
t2 -
Delay on release 0.5 s
t3 -
Energy backup 5 s
Function undervoltage (switch U<Y)
When supply voltage is applied, the alarm relay works in N/C operation (relay energized).
When the phase-to-phase voltage of one, two or all conductors drops below the set
response value Y, the alarm relay de-energizes and the LED ALARM lights up. If the
measured quantity exceeds the response value plus hysteresis, the alarm relay switches
back to its original state.
Note
False alarms resulting from operational measurement errors can be suppressed by setting
a time delay. The set response delay remains effective even in case of complete supply
voltage failure.
3.1

Main catalogue part 3 06.2007 / Electronic measuring and monitoring relays
55
Technical data undervoltage or overvoltage SUD473
Insulation coordination acc. to IEC 60664-1
Rated insulation voltage
AC 400 V
Rated impulse voltage/pollution degree
4 kV/3
Supply voltage
Supply voltage U
S

none
Power consumption
3 VA
Measuring circuit
Nominal system voltage U
n

3NAC 110 / 230 / 400 V
Response values (L-N)
4080 V / 80170 V / 150300 V
Frequency f
n

50400 Hz
Response time t
an

< 500 ms
Response delay t
v

0.35 s
Hysteresis 2.53.5
%
Delay on release
approx. 0.5 s
Repitition accuracy
±1.5 %
Temperature influence
< 0.05 % / °C
Recovery time t
b
0.2
s
Switching elements
Number of changeover contacts
1 x 2
Operating principle overvoltage function
N/O operation
Operating principle undervoltage function
N/C operation
Electrical service life, number of cycles
12000
Contact class IEC 60255 Part 0-20
IIB
Rated contact voltage
AC 250 V/DC 300 V
Limited making capacity
AC/DC 5 A
Breaking capacity
2 A, AC 230 V, cos phi 0.4

0.2 A, DC 220 V, L/R = 0.04 s
Environment / EMC
EMC immunity
acc. to IEC 61000-6-2
EMC emission
acc. to IEC 61000-6-4
Shock resistance IEC 60068-2-27 (during operation)
15 g/11 ms
Bumping IEC 60068-2-29 (during transport)
40 g/6 ms
Vibration resistance IEC 60068-2-6 (during operation)
1 g / 10150 Hz
Vibration resistance IEC 60068-2-6 (during transport)
2 g / 10150 Hz
Ambient temperature, during operation
-5+50 ºC
Ambient temperature, during storage
-25+70 ºC
Climatic class acc. to IEC 60721-3-3
3K5 (except condensation and formation of ice)
Other
Operating mode
continuous operation
Mounting
any position
Connection
screw terminals
Connection properties
single wire
0.24 mm
2
flexible with end ferrules
0.252.5 mm
2
Degree of protection, internal components (IEC 60529)
IP30
Degree of protection, terminals (IEC 60529)
IP20
Screw fixing
2 x M4
DIN rail mounting acc. to
IEC 60715
Flammability class
UL94V-0
Product standard
IEC 60255-6
Operating manual
BP301010
Weight
360 g
Wiring diagram
1 -
6 A fuse
2 - Power On LED ON
3 - LED ALARM
4 - TEST button
5 - Adjustable response value Y
6 - Selector switch to choose between undervoltage and over-
voltage U<Y U>Y
7 - Adjustable response delay t
8 - Alarm relay with two changeover contacts
Ordering information
Type
Nominal system voltage U
n

Response value
Art. No.
SUD473
3NAC 110 V
4080 V
B 933 220
SUD473
3NAC 230 V
80170 V
B 933 171
SUD473
3NAC 400 V
150300 V
B 933 703
Dimension diagram X470 Dimensions in mm
3
8
4
5
6
7
2
1
Undervoltage or overvoltage relays SUD473
3.1