Specifications are subject to change without notice (20.04.05) 1
Monitoring Relays
Product Description
• 3-phase monitoring relay for phase
sequence and phase loss
• Detects when all phases are present and have the
correct sequence
• Measures own power supply
• Power supply range: 208 to 480 VAC (±15%)
• Output: 5 A SPDT relay (DPA51) or 5 A DPDT r elay (DPA71)
normally energized
• For mounting on DIN-rail in accordance with
DIN/EN 50 022
• 17.5 mm (DPA51) or 35.5 mm (DPA71) DIN-rail housing
(DIN 43880)
• LED indication for relay and power supply ON
Type Selection
Mounting Output Supply: 208 to 480 VAC Supply: 208 to 240 VAC Supply: 380 to 480 VAC
DIN-rail SPDT DPA 51 C M44
DIN-rail DPDT DPA 71 D M23 DPA 71 D M48
Input
L1, L2, L3 Terminals L1, L2, L3
Measures on own supply
Measuring range
208 to 480 VAC (DPA51CM44) 177 to 550 VAC
208 to 240 VAC (DPA71DM23) 177 to 275 VAC
380 to 480 VAC (DPA71DM48) 323 to 550 VAC
ON-level > 85% of the phase- phase
voltage
3-Phase Sequence and Phase Loss
Types DPA51, DPA71
Input Specifications
Output SPDT or DPDT relay, N.E.
Rated insulation voltage 250 VAC
Contact ratings (AgSnO
2
)µ
DPA51 (SPDT):
Resistive loads AC 1 5 A @ 250 VAC
DC 12 5 A @ 24 VDC
Small inductive loads AC 15 2.5 A @ 250 VAC
DC 13 2.5 A @ 24 VDC
DPA71 (DPDT)
Resistive loads AC 1 5 A @ 250 VAC
Small inductive loads AC 15 3 A @ 250 VAC
DC 13 3 A @ 24 VDC
Mechanical life ≥ 30 x 106operations
Electrical life ≥ 10
5
operations
(at 5 A, 250 V, cos ϕ = 1)
Operating frequency ≤ 7200 operations/h
Dielectric strength
Dielectric voltage
≥ 2 kVAC (rms)
Rated impulse withstand volt. 4 kV (1.2/50 µs)
Output Specifications
3-Phase relay for detection of
incorrect phase sequence,
total and partial phase loss.
Supply range from 208 to 480
VAC covered by three multivoltage relay. For mounting
on DIN-rail. Housing 17.5 mm
wide for SPDT version and
35.5 mm for DPDT version,
suitable both for back and
front panel mounting. The
device detects regenerated
voltage up to 85% of the
nominal voltage (phasephase).
DPA51
DPA71
Ordering Key
Housing
Function
Type
Item number
Output
Power supply
DPA 51 C M44
2 Specifications are subject to change without notice (20.04.05)
m
11
12 14L2 L3L1
L1
L2
L3
L2
L3
m<3
m
21
22 24
L1
L2
L3
L2 L3L1
L2
L3
m<3
m
21
22 24
m
11
12 14
Wiring Diagrams
Example 1
DPA51, DPA71
Mode of Operation
DPA51 and DPA71 monitor
their own 3-phase power
supply voltage.
The relays operate when all
the phases are present and the
phase sequence is correct.
The relays release when one
phase-phase voltage drops
below 85% of the other
phase-phase voltages or
when the phase sequence is
wrong.
Example 1
The relay monitors that the
power supply has the correct
phase sequence and that all
phases are present.
Example 2
The relay releases in case of
interruption of one or more
phases, provided that the
regenerated voltage does
not exceed 85% of the
phase-phase voltage.
Example 2
Reaction time
Alarm ON delay < 100 ms
Alarm OFF delay < 300 ms
Accuracy (15 min warm-up time)
Temperature drift ± 1000 ppm/°C
Repeatability ± 0.5% on full scale
Indication for
Power supply ON LED, green
Relay ON LED, yellow
Environment
Degree of protection IP 20
Pollution degree 3
Operating temperature
(DPA51)@ Max. voltage, 50 Hz -20 to +60°C, R.H. < 95%
(DPA51)@ Max. voltage, 60 Hz -20 to +50°C, R.H. < 95%
(DPA71) -20 to +50°C, R.H. < 95%
Storage temperature -30 to 80°C, R.H. < 95%
Housing dimensions
DPA51 17.5 x 81 x 67.2 mm
DPA71 35.5 x 81 x 67.2 mm
Weight Approx. 75 g
Screw terminals
Tightening torque Max. 0.5 Nm
acc. to IEC 60947
Approvals UL, CSA (DPA51 only)
CE Marking Yes
EMC Electromagnetic Compatibility
Immunity According to EN 61000-6-2
Emission According to EN 50081-1
General Specifications
Power supply
Overvoltage cat. II
Rated operational voltage (IEC 60664, IEC 60038)
through terminals: L1, L2, L3
DPA51CM44 208 to 480 VAC ± 15%,
45 to 65 Hz
DPA71DM23 208 to 240 VAC ± 15%,
45 to 65 Hz
DPA71DM48 380 to 480 VAC ± 15%,
45 to 65 Hz
Rated operational power
DPA51
13 VA @ 400 VAC, 50 Hz
Supplied by L2 and L3
DPA71 10 VA @ 400 VAC, 50 Hz
6 VA @ 230 VAC, 50 Hz
Supplied by L2 and L3
Supply Specifications
DPA51C... DPA71D...
DPA71D...
DPA51C... DPA71D...
DPA71D...
µ
µ
µ
µ
Specifications are subject to change without notice (20.04.05) 3
Operation Diagram
Dimensions
67.2
18.7
45
17.5
81
2
DPA51, DPA71
67.2
18.7
45
35.5
81
2
L1
L2
L3
L2
L1
L3
L3
L2
L1
L1
L2
L3
Relay(s) ON
L3
L2
L1
DPA51
DPA71
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