Specifications are subject to change without notice (10.01.00)
1
Current and Voltage Controls
Type EUC
Monitoring relay and 3-phase measuring
relay for over/under phase neutral voltage
control (closed circuit)
Measures if all 3 phase-neutral voltages are within
set limits
Measures on own power supply
Operates irrespective of phase sequence
Upper and lower limits separately adjustable
2 separately adjustable time functions (0.1-10 s)
Output: 2 x 5 A SPDT (one relay for each level)
For mounting on DIN-rail in accordance with
DIN/EN 50 022
45 mm Euronorm housing
LED-indication for power supply ON
Two LED's indicating fault and/or status of the
2 relay outputs (flashing when timing)
Ordering Key
Type Selection
Mounting
Output
Supply: 220 VAC
Supply: 400 VAC
For DIN-rail
2 x SPDT
EUC C 220
EUC C 400
Product Description
Housing
Function
Type
Output
Power supply
3-phase and neutral monitor-
ing relay for separate over and
under voltage control with
built-in time function. Often
used in applications to pro-
tect the connected equipment
when the supplied voltage
varies.
Input Specifications
Input U, V, W, N
L1 - L2 - L3 - N
measures on own supply
arbitrary phase sequence
Measuring ranges
Upper level
Lower level
127/220
130-140 VAC 114-124 VAC
230/400*
236-254 VAC 208-226 VAC
Range
Upper level (sep. adjustable)
102 - 110%
Lower level (sep. adjustable)
90 - 98%
* Only EUC C 400
selectable in (rotary switch)
380 V, 400 V, 415 V
Output Specifications
Output
2 x SPDT relay
Rated insulation voltage
250 VAC (contact/elect.)
Upper limit
Terminals 25/26/28
Lower limit
Terminals 15/16/18
Contact ratings (AgCdO)
(micro gap)
Resistive loads
AC 1
5 A,250 VAC
DC 1
5 A, 24 VDC
Small inductive loads AC 15
2 A, 250 VAC
DC 13
3 A, 24 VDC
Mechanical life
40 x 10
6
operations
Electrical life
10
5
operations
(at max. load)
Operating frequency
7200 operations/h
Dielectric strength
Dielectric voltage
2 kVAC (rms)
Rated impulse withstand volt. 4 kV (1.2/50 s)
3-Phase + N Over/Under Voltage
EUC C 220
2
Specifications are subject to change without notice (10.01.00)
EUC
General Specifications
Power ON delay
Approx. 5 s
Reaction time
200 ms
worst case reaction time
may be up to 5 x
Accuracy
Range
2%
Delay (u/l level)
10 s, -2/+3 s on max.
< 0.1 s on min.
Temperature drift
0.1%/C (
0.06%/F)
Hysteresis
< 2,5% rms value
Indication for
Power supply ON
LED, green
Output ON
2 LED's, yellow
(flashing when timing)
Environment
Degree of protection
IP 20
Pollution degree
3
Operating temperature
-20 to +50C (-4 to +122F)
Storage temperature
-50 to +85C (-58 to +185F)
Weight
240 g
Screw terminals
Tightening torque
Max. 0.5 Nm acc. to IEC 60947
Approvals
UL, CSA
CE-marking
Yes
Supply Specifications
Power supply
Overvoltage cat. III (IEC 60664)
Rated operational voltage
(IEC 60038)
Through term. U, V, W, N
220
127/220 VAC, 10%
50/60 Hz, -5/+5 Hz
400
230/400 VAC, 10%
50/60 Hz, -5/+5 Hz
Voltage interruption
40 ms
Dielectric voltage
None
Rated impulse withstand
voltage
4 kV (1.2/50 s)
Rated operational power
3 VA
Supplied from
L3 & Neutral
Mode of Operation
Connected to 3 phases +N,
the EUC measures sinusoidal
voltages. The phase sequence
is arbitrary.
The EUC operates as long as
all 3 phase-neutral voltages
are within set upper and lower
levels. This means that the
two output relays are ener-
gized, which is indicated by
the two built-in yellow LED's.
If one or more of the phase-
neutral voltages rises above
the adjusted upper level, then
the centre yellow LED starts
to flash, and the output relay
(terminals 25/26/28) releases
after the set time period.
If one or more of the phase-
neutral voltages drops below
the adjusted lower level, then
the left yellow LED starts to
flash, and the output relay (ter-
minals 15/16/18) releases af-
ter the set time period. There
will be no LED-indication after
the time delay has expired.
Example 1
Mains monitoring
The relay measures if the 3
phase-neutral voltages are with-
in the set upper and lower levels.
The levels are adjusted on the
two built-in potentiometers.
Example 2
Load monitoring
Ohmic loads such as heating
elements etc. can be moni-
tored by this module.
Note:
The relay cannot be used for
load monitoring if the load is a
motor, as the regenerated
phase voltage at e.g. fuse break-
down is indefinable and depen-
dent on the mechanical perfor-
mance when the failure oc-
curs.
Wiring Diagrams
Example 1
Example 2
Specifications are subject to change without notice (10.01.00)
3
EUC
Range/Level/Time Setting
Range setting
Upper right knob:
Selection of measuring range:
380 V, 400 V, 415 V.
Only available on EUC C 400.
Level setting
Upper left knob:
Setting of upper limit on rela-
tive scale (102% to 110%).
Lower left knob:
Setting of lower limit on rela-
tive scale (90% to 98%).
Time setting upper level
Centre right knob:
Setting of time delay on abso-
lute scale (0.1-10 s).
Time setting lower level
Lower right knob.
Setting of time delay on abso-
lute scale (0.1-10 s).
Operation Diagram
Upper level
Lower level
Relay 2 upper (25/26/28)
Relay 1 lower (15/16/18)
L2
L1
L3
Hysteresis
Hysteresis
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