Current and Voltage Controls
3-Phase Sequence and Phase Loss
Type EUA
• 3-phase monitoring relay for phase
sequence/phase loss (closed circuit)
• Measures when all 3 phases are present and have
the correct phase sequence
• Measures on own power supply
• Knob-adjustable level setting
• Output: Up to 3 x 5 A SPDT relay
• For mounting on DIN-rail in accordance with
DIN/EN 50 022
• 45 mm Euronorm housing
• LED-indication for relay and power supply ON
Product Description
3-phase line voltage monitor-
ing and phase sequence/
phase loss relay. Adjustment
on built-in potentiometer of
monitored voltage within
±15% of rated operational
voltage. For mounting on DIN-
rail. Frequently used to se-
cure the right phase sequence
when applying a load to a 3-
phase electrical network.
Ordering Key
Housing
Function
Type
Output
Power supply
EUA C 400
Type Selection
Mounting
For DIN-rail
Output
1 SPDT
2 SPDT
3 SPDT
Supply: 220 VAC
EUA C 220
EUA D 220
EUA T 220
Supply: 400 VAC
EUA C 400
EUA D 400
EUA T 400
Supply: 480 VAC
EUA C 480
EUA D 480
EUA T 480
Supply: 600 VAC
EUA C 600
EUA D 600
Input Specifications
Input
U, V, W
Measuring ranges
220
400
480
600
L1 - L2 - L3
measures on own supply
187-253 VAC
340-460 VAC
408-552 VAC
510-690 VAC
70% of voltage setting
±15% (of rated operational
voltage)
Supply Specifications
Power supply
Rated operational voltage
Through term. U, V, W 220
400
480
600
Voltage interruption
Dielectric voltage
Rated impulse withstand
voltage
up to 480 VAC
up to 600 VAC
Rated operational power
Supplied from
Overvoltage cat. III (IEC 60664)
(IEC 60038)
220 VAC, ±15%
50/60 Hz, -5/+5 Hz
400 VAC, ±15%
50/60 Hz, -5/+5 Hz
480 VAC, ±15%
50/60 Hz, -5/+5 Hz
600 VAC, ±15%
50/60 Hz, -5/+5 Hz
≤
40 ms
None
4 kV (1.2/50 µs)
6 kV (1.2/50 µs)
2.5 VA
L1 & L3
ON-level
Voltage setting
Output Specifications
Output
Rated insulation voltage
Contact ratings
(AgCdO)
AC 1
Resistive loads
DC 1
Small inductive loads AC 15
DC 13
Mechanical life
Electrical life
1, 2 or 3 x SPDT relay
250 VAC (contact/elect.)
µ (micro gap)
5 A, 250 VAC
5 A, 24 VDC
2 A, 250 VAC
3 A, 24 VDC
≥
40 x 10
6
operations
≥
10
5
operations
(at max. load)
≤
7200 operations/h
Operating frequency
Dielectric strength
Dielectric voltage
2 kVAC (rms)
Rated impulse withstand volt. 4 kV (1.2/50 µs)
Specifications are subject to change without notice (10.01.00)
1
EUA
General Specifications
Reaction time
OFF-delay
ON-delay
Accuracy
Temperature drift
Hysteresis
Indication for
Power supply ON
Output ON
Environment
Degree of protection
Pollution degree
Operating temperature
Storage temperature
Weight
Screw terminals
Tightening torque
Approvals
CE-marking
< 30 ms
< 500 ms
±10%
≤
0.2%/°C (≤ 0.11%/°F)
< 10%
LED, green
LED, yellow
IP 20
3
-20° to +50°C (-4° to +122°F)
-50° to +85°C (-58° to +185°F)
280 g
Max. 0.5 Nm acc. to IEC 60947
UL, CSA
Yes
Mode of Operation
EUA measures on its own 3-
phased power supply, and the
relay operates when all phases
are present and the phase se-
quence is correct.
The level of the monitored
voltage is adjustable on the
front of the module within
±15%. The relay releases when
one or more of the phases
drops below 70% of the set
level. (Ex. if the voltage regen-
erated by electric motors ex-
ceeds the 70% level, the set
level can be adjusted until the
relay releases).
Example 1
The relay monitors that the
power supply has the correct
phase sequence and that all
phase voltages are present.
Example 2
The relay releases in case of
interruption of one of the
phases, provided that the re-
generated voltage does not
exceed the 70% level (see
above).
Range Setting
Potentiometer for setting of
measuring range (line voltage).
Wiring Diagrams
Example1
L3
L2
L1
Example 2
L3
L2
L1
M
µ
m < 3
U
V
W
12
14
22
µ
24
32
µ
34
m < 3
U
V
W
12
µ
14
22
µ
24
32
µ
34
~
L1
L3
11
EUA C...
EUA D...
EUA T...
~
L1
21
EUA D...
EUA T...
31
EUA T...
L3
11
EUA C...
EUA D...
EUA T...
21
EUA D...
EUA T...
31
EUA T...
Operation Diagram
Power supply ON L1
Power supply ON L2
Power supply ON L3
Relay ON
2
Specifications are subject to change without notice (10.01.00)
