Monitoring Relays
1-Phase True RMS AC/DC Over or Under Current
Type DIB71
• TRMS AC/DC over or under current
monitoring relay
• Current measuring through internal shunt
• Selection of measuring range by DIP-switches
• Measuring ranges from 0.1 mA to 5 A AC/DC
• Adjustable current on relative scale
• Adjustable hysteresis on relative scale
• Adjustable delay function (0.1 to 30 s)
• Programmable latching or inhibit at set level
• Output: 5 A SPDT relay N.D. or N.E. selectable
• For mounting on DIN-rail in accordance with
DIN/EN 50 022
• 35.5 mm DIN-rail housing
• LED indication for relay, alarm and power supply ON
• Galvanically separated power supply
Product Description
DIB71 is a precise TRMS
AC/DC over or under current
(selectable by DIP-switch)
monitoring relays. Direct mea-
suring
or through current
transformer.
Owing to the built-in latch
function, the ON-position of
the relay output can be
maintained. Inhibit function
can be used to avoid relay
operation when not desired
(maintenance, transitions).
The LED's indicate the state
of the alarm and the output
relay. Through the built-in
shunt it is possible to moni-
tor loads up to 5 A AC/DC.
35.5 mm wide housing suit-
able both for back and front
panel mounting.
Ordering Key
Housing
Function
Type
Item number
Output
Power supply
Measuring range
DIB 71 C B23 5A
Type Selection
Mounting
DIN-rail
DIN-rail
DIN-rail
DIN-rail
Output
SPDT
SPDT
SPDT
SPDT
Measuring range
0.1 to 5 mA AC/DC
1 to 50 mA AC/DC
10 to 500 mA AC/DC
0.1 to 5 A AC/DC
Supply: 24/48 VAC
DIB 71 C B48 5mA
DIB 71 C B48 50mA
DIB 71 C B48 500mA
DIB 71 C B48 5A
Supply: 115/230 VAC
DIB 71 C B23 5mA
DIB 71 C B23 50mA
DIB 71 C B23 500mA
DIB 71 C B23 5A
Input Specifications
Input
(current level)
Measuring ranges
Direct
Selectable by DIP-switch
..5MA:
0.1 to 1 mA AC/DC
0.2 to 2 mA AC/DC
0.5 to 5 mA AC/DC
Max. current for 1 s
..50MA:
1 to 10 mA AC/DC
2 to 20 mA AC/DC
5 to 50 mA AC/DC
Max. current for 1 s
..500MA:10
to 100 mA AC/DC
20 to 200 mA AC/DC
50 to 500 mA AC/DC
Max. current for 1 s
..5A:
0.1 to 1 A AC/DC
0.2 to 2 A AC/DC
0.5 to 5 A AC/DC
Max. current for 1 s
Terminals Y1, Y2
Internal resist.
100
Ω
100
Ω
100
Ω
10
Ω
10
Ω
10
Ω
1
Ω
1
Ω
1
Ω
0.03
Ω
0.03
Ω
0.03
Ω
Max. curr.
40 mA
40 mA
40 mA
100 mA
120 mA
120 mA
120 mA
300 mA
700 mA
700 mA
700 mA
1.4 A
6A
6A
6A
15 A
Measuring ranges (cont.)
Standard CT (examples)
TADK2
50 A/5 A
CTD1
150 A/5 A
CTD4
400 A/5 A
TAD12
1000 A/5 A
TACO200
6000 A/5 A
Contact input
Disabled
Enabled
Latch disable
AAC
rms
5 to 50 A
15 to 150 A
40 to 400 A
100 to 1000 A
600 to 6000 A
Terminals Z1, Y1
> 10 kΩ
< 500
Ω
> 500 ms
Max. curr.
60 A
180 A
480 A
1200 A
7200 A
Specifications are subject to change without notice (26.05.10)
1
DIB71
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 5 A, 250 V, cos
ϕ
= 1)
≤
7200 operations/h
General Specifications
Power ON delay
Reaction time
Alarm ON delay
Alarm OFF delay
Accuracy
Temperature drift
Delay ON alarm
Repeatability
Indication for
Power supply ON
Alarm ON
Output relay ON
Environment
Degree of protection
Pollution degree
Operating temperature
5A
others
Storage temperature
Housing
Dimensions
Material
Weight
Screw terminals
Tightening torque
Product standard
Approvals
CE Marking
EMC
Immunity
Emissions
1 s ± 0.5 s or 6 s ± 0.5 s
(input signal variation from
-20% to +20% or from
+20% to -20% of set value)
< 100 ms
< 100 ms
(15 min warm-up time)
± 1000 ppm/°C
± 10% on set value ± 50 ms
± 0.5% on full-scale
LED, green
LED, red (flashing 2 Hz
during delay time)
LED, yellow
(EN 60529)
IP 20
3
-20 to 50°C, R.H. < 95%
-20 to 60°C, R.H. < 95%
-30 to 80°C, R.H. < 95%
35.5 x 81 x 67.2 mm
PA66 or Noryl
Approx. 150 g
Max. 0.5 Nm
acc. to IEC 60947
EN 60255-6
UL, CSA
L.V. Directive 2006/95/EC
EMC Directive 2004/108/EC
According to EN 60255-26
According to EN 61000-6-2
According to EN 60255-26
According to EN 61000-6-3
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:
A1, A2 or A3, A2
B48:
B23:
Dielectric voltage
Supply to input
Supply to output
Input to output
Rated operational power
AC
Overvoltage cat. III
(IEC 60664, IEC 60038)
24/48 VAC ± 15%
45 to 65 Hz, insulated
115/230 VAC ± 15%
45 to 65 Hz, insulated
4 kV (1.2/50 µs)
4 kV (1.2/50 µs)
4 kV (1.2/50 µs)
3 VA
Mode of Operation
DIB71 monitors both AC and
DC over or under current
through an internal shunt.
Example 1
(connection between termi-
nals Z1, Y1 - latching func-
tion enabled)
The relay operates and latch-
es in operating position
when the measured value
exceeds (or drops below) the
set level for more than the
set delay time. Provided that
the current has dropped
below (or has exceeded) the
set point (see hysteresis set-
ting), the relay releases when
the interconnection between
terminals Z1, Y1 is interrupt-
ed or the power supply is
interrupted as well.
The red LED flashes until the
delay time has expired or the
measured value comes back
to a non-alarm value (see
hysteresis setting).
Example 2 (Stardard CT)
(no connection between ter-
minals Z1, Y1 - latch func-
tion disabled)
The relay operates when the
measured value exceeds (or
drops below) the set level for
more than the set delay time.
It releases when the current
drops below (or exceeds) the
set level (see hysteresis set-
ting) or when power supply
is interrupted.
Note
When the inhibit contact is
opened, if the input signal is
already in alarm position, the
delay time needs to elapse
before relay activation.
2
Specifications are subject to change without notice (26.05.10)
DIB71
Function/Range/Level and Time Delay Setting
Adjust the input range set-
ting the DIP switches 1 and
2 as shown in figure.
Select the desired function
setting the DIP switches 3 to
6 as shown in figure.
To access the DIP switches
open the plastic cover as
shown in figure.
Selection of level and time
delay:
Upper knob:
Setting of hysteresis on rela-
tive scale: 0 to 30% on set
value.
Centre knob:
Current level setting on rela-
tive scale: 10 to 110% on
full scale.
Lower knob:
Setting of delay on alarm
time on absolute scale (0.1
to 30 s).
Measuring range
SW1
SW2
5MA
50MA
500MA
5A
ON
OFF
1 mA
10 mA
100 mA
1A
ON
ON
2 mA
20 mA
200 mA
2A
OFF
ON
5 mA
50 mA
500 mA
5A
Relay working mode
ON: Normally De-energized
OFF: Normally Energized
Power ON delay
ON: 6 s ± 0.5 s
OFF: 1 s ± 0.5 s
Contact input
ON: Latch function enable
OFF: Inhibit function enable
Monitoring function
ON: Over current
OFF: Under current
Operation Diagrams
Over current - N.D. relay
Under current - Latch function - N.D. relay
Under current - N.D. relay
Over current - Inhibit function - N.D. relay
Specifications are subject to change without notice (26.05.10)
3
DIB71
Wiring Diagrams
Example 1
Latch/Inhibit
Enable
48/230 VAC
24/115 VAC
Example 2
48/230 VAC 24/115 VAC
L
m
A3
16
18
PE
Y1
Y2
L
m
A3
16
18
Y1
Y2
I
Z1
A1
I
Z1
A1
A2
N (-)
15
A2
N (-)
15
Dimensions
35.5
67.2
18.7
81
4
2
45
Specifications are subject to change without notice (26.05.10)
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