Specifications are subject to change without notice (09.10.06) 1
Monitoring Relays
Product Description Ordering Key
Housing
Function
Type
Item number
Output
Power supply
• 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
Type Selection
Mounting Output Measuring range Supply : 12/24 VDC Supply: 48 VDC
DIN-rail SPDT 8 to 28 VDC DUA 52 C 724
DIN-rail SPDT 38 to 58 VDC DUA 52 C 748
Input (voltage level) Terminals A1, A2
Measures on own power
supply
Measuring ranges
Direct Level
48 VDC 38 to 58 VDC
12 to 24 VDC 8 to 28 VDC
DC Under Voltage
Type DUA52
Input Specifications
Output SPDT relay
Rated insulation voltage 250 VAC
Contact ratings (AgSnO2) µ
Resistive loads AC 1 5 A @ 250 VAC
DC 12 5A@24 VDC
Small inductive loads AC 15 2.5 A @ 250 VAC
DC 13 2.5 A @ 24 VDC
Mechanical life ≥30 x 106operations
Electrical life ≥105operations
(at 8 A, 250 V
,cos ϕ=1)
Operating frequency ≤7200 operations/h
Dielectric strength
Dielectric voltage 2 kVAC (rms)
Rated impulse withstand volt. 4kV (1.2/50 µs)
Output Specifications
DUA 52 C 724
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.
Power supply Overvoltage cat. III
Rated operational voltage (IEC 60664, IEC 60038)
through terminals:
A1 and A2 724 8to 28 VDC
748 38 to 58 VDC
Dielectric voltage None
Dielectric voltage
Supply to output 2 kV
Rated operational power 1.5 W
Supply Specifications
2Specifications are subject to change without notice (09.10.06)
Operation Diagram Wiring Diagram
Selection of level:
Centre knob:
Setting of level on absolute
scale.
Lower knob:
Setting of hysteresis on rela-
tive scale
Range and Level Setting
DUA52
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.
Environment
Degree of protection IP 20
Pollution degree 3
Operating temperature -20 to 60°C, R.H. < 95%
Storage temperature -30 to 80°C, R.H. < 95%
Housing
Dimensions 17.5 x 81 x 67.2 mm
Material PA 66
Weight Approx. 75 g
Screw terminals
Tightening torque Max. 0.5 Nm
acc. to IEC 60947
Approvals UL, CSA
CE Marking Yes
General Specifications
Relay ON
Setpoint
Hysteresis
67.2
18.7
45
17.5
81
2
Dimensions
Power ON delay <200 ms
Reaction time (input signal variation from
-20% to +20% or from
+20% to -20% of set value)
Alarm ON delay < 200 ms
Alarm OFF delay < 200 ms
Accuracy (15 min warm-up time)
Temperature drift ± 1000 ppm/°C
Alarm delay ± 10% on set value ± 50 ms
Repeatability ± 0.5% on full-scale
Indication for
Power supply ON LED, green
Output relay ON LED, yellow
