Monitoring Relays
DC Under Voltage
Type DUA52
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DC undervoltage monitoring relay
Measuring if power supply is below the set level
Measures on own power supply
Measuring ranges: 8 - 28 V DC and 38 - 58 V DC
Adjustable hysteresis: 4 to 50%
Output: 5 A SPDT NE relay
For mounting on DIN-rail in accordance with
DIN/EN 50 022
• 17.5 mm housing (DIN 43880)
• LED indication for relay and power supply ON
Product Description
DUA52 is a voltage monitor-
ing relay that measure its own
power supply. The measuring
ranges are 8-28 VDC and 38-
58 VDC. It has separate
potentiometers for setpoint
and hysteresis. Typical appli-
cations are monitoring of
backup batteries, batteries on
diesel generator sets and the
like.
Ordering Key
Housing
Function
Type
Item number
Output
Power supply
DUA 52 C 724
Type Selection
Mounting
DIN-rail
DIN-rail
Output
SPDT
SPDT
Measuring range
8 to 28 VDC
38 to 58 VDC
Supply : 12/24 VDC
DUA 52 C 724
DUA 52 C 748
Supply: 48 VDC
Input Specifications
Input
(voltage level)
Terminals A1, A2
Measures on own power
supply
Level
38 to 58 VDC
8 to 28 VDC
Output Specifications
Output
Rated insulation voltage
Contact ratings
(AgSnO
2
)
Resistive loads
AC 1
DC 12
Small inductive loads AC 15
DC 13
Mechanical life
Electrical life
SPDT relay
250 VAC
µ
5 A @ 250 VAC
5 A @ 24 VDC
2.5 A @ 250 VAC
2.5 A @ 24 VDC
≥
30 x 10
6
operations
≥
10
5
operations
(at 8 A, 250 V, cos
ϕ
= 1)
≤
7200 operations/h
Measuring ranges
Direct
48 VDC
12 to 24 VDC
Operating frequency
Dielectric strength
Dielectric voltage
2 kVAC (rms)
Rated impulse withstand volt. 4 kV (1.2/50 µs)
Supply Specifications
Power supply
Rated operational voltage
through terminals:
724
A1 and A2
748
Dielectric voltage
Dielectric voltage
Supply to output
Rated operational power
Overvoltage cat. III
(IEC 60664, IEC 60038)
8 to 28 VDC
38 to 58 VDC
None
2 kV
1.5 W
Specifications are subject to change without notice (09.10.06)
1
DUA52
General Specifications
Power ON delay
Reaction time
Alarm ON delay
Alarm OFF delay
Accuracy
Temperature drift
Alarm delay
Repeatability
Indication for
Power supply ON
Output relay ON
< 200 ms
(input signal variation from
-20% to +20% or from
+20% to -20% of set value)
< 200 ms
< 200 ms
(15 min warm-up time)
± 1000 ppm/°C
± 10% on set value ± 50 ms
± 0.5% on full-scale
LED, green
LED, yellow
Environment
Degree of protection
Pollution degree
Operating temperature
Storage temperature
Housing
Dimensions
Material
Weight
Screw terminals
Tightening torque
Approvals
CE Marking
IP 20
3
-20 to 60°C, R.H. < 95%
-30 to 80°C, R.H. < 95%
17.5 x 81 x 67.2 mm
PA 66
Approx. 75 g
Max. 0.5 Nm
acc. to IEC 60947
UL, CSA
Yes
Mode of Operation
DUA52 monitors the DC val-
ue of its own power supply.
The output is energized
when the measured voltage
is rising above the setpoint
plus hysteresis, and is deen-
ergized when the measured
voltage drops below the set-
point value.
Range and Level Setting
Selection of level:
Centre knob:
Setting of level on absolute
scale.
Lower knob:
Setting of hysteresis on rela-
tive scale
Operation Diagram
Wiring Diagram
Hysteresis
Setpoint
Relay ON
Dimensions
17.5
67.2
18.7
81
2
2
45
Specifications are subject to change without notice (09.10.06)
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