Specifications are subject to change without notice (18.09.06) 1
Monitoring Relays
Product Description Ordering Key
Housing
Function
Type
Item number
Output
Power supply
Range
• AC/DC over current monitoring relay
• Current measured through internal shunt
• Measuring range 0.5 to 5 A AC/DC
•Adjustable current limit on relative scale
•Adjustable hysteresis
•Programmable latching at set level
• Output: 8 A SPDT relay normally de-energized
• For mounting on DIN-rail in accordance with DIN/EN
50 022 (DIA01) or plug-in module (PIA01)
• 22.5 mm Euronorm housing (DIA01) or 36 mm plug-in
module (PIA01)
• LED indication for relay and power supply ON
• Galvanically separated power supply
Type Selection
Mounting Output Supply: 24 VDC Supply: 48 VDC Supply: 24/48 VAC Supply: 115/230 VAC
DIN-rail SPDT DIA 01 C 724 5A DIA 01 C 748 5A DIA 01 C B48 5A DIA 01 C B23 5A
Plug-in SPDT PIA 01 C 724 5A PIA 01 C 748 5A PIA 01 C B48 5A PIA 01 C B23 5A
Input (current level)
DIA01 Terminals Y1, Y2
PIA01 Terminals 5, 7
Measuring ranges
Direct Internal resist. Max. curr.
..5A: 0.5 to 5 A AC/DC 0.05 Ω6 A
Max. current for 1 s 25 A
StandardCT (examples) AACrms Max. curr.
TADK2 50 A/5 A 5 to 50 A 60 A
TAD2 150 A/5 A 15 to 150 A 180 A
TAD6 400 A/5 A 40 to 400 A 480 A
TAD12 1000 A/5 A 100 to 1000 A 1200 A
TACO200 6000 A/5 A 600 to 6000 A 7200 A
Contact input
DIA01 Terminals Z1, Y1
PIA01 Terminals 8, 9
Disabled >10 kΩ
Enabled <500 Ω
Latch disable > 500 ms
Note:
The input voltage cannot
raise over 300 VAC/DC with
respect to ground (PIA only)
1-Phase AC/DC Over Current
Types DIA01, PIA01
Input Specifications
Output SPDT relay
Rated insulation voltage 250 VAC
Contact ratings (AgSnO2)µ
Resistive loads AC 1 8A@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
≥2kVAC (rms)
Rated impulse withstand volt. 4 kV (1.2/50 µs)
Output Specifications
DIA 01 C B23 5A
DIA01 and PIA01 are precise
AC/DC over current monitor-
ing relays. Direct measuring
or through current transformer.
Owing to the built-in latch
function, the ON-position of
the relay output can be
maintained.
The red LED indicates the
relay status. Through the
built-in shunt it is possible to
monitor loads up to 5 A
AC/DC.
DIA01 PIA01
2Specifications are subject to change without notice (18.09.06)
Range Setting
Centre knob:
Setting of current on relative
scale: from 10 to 110% of the
full-scale value.
Hysteresis:
Approx. 4% of set value, it
can be extended by inserting
a resistor between terminals
Z1, Y1 or 8, 9.
Approx. resistor values:
10%: 180 kΩ
25%: 47 kΩ
50%: 22 kΩ
75%: 15 kΩ
Latch: < 500 Ω
DIA01, PIA01
Mode of Operation
DIA01 and PIA01 monitor
both AC and DC over current
through an internal shunt.
They can monitor AC cur-
rents up to 6000 A when
connected to a suitable cur-
rent transformer.
Example 1
(connection between termi-
nals Z1, Y1 or 8, 9 - latch
function enabled)
The relay operates and latch-
es in operating position
when the measured value
exceeds the set level. Pro-
vided that the current has
dropped min. 4% below the
set point (see hysteresis) the
relay releases when the inter-
connection between termi-
nals Z1, Y1 or 8, 9 is inter-
rupted or the power supply
is interrupted as well.
Example 2 (Stardard CT)
(no connection between ter-
minals Z1, Y1 or 8, 9 - latch
function disabled)
The relay operates when the
current flowing through the
transformer exceeds the set
level. It releases when the
current drops min. 4% below
the set level (see hysteresis)
or when the power supply is
interrupted.
Power supply Overvoltage cat. III
Rated operational voltage (IEC 60664, IEC 60038)
through terminals:
A1, A2 or A3, A2 (DIA01)
2, 10 or 11, 10 (PIA01)
724: 24 VDC ± 20%, insulated
748: 48 VDC ± 20%, insulated
B48: 24/48 VAC ± 15%
45to 65 Hz, insulated
B23: 115/230 VAC ± 15%
45 to 65 Hz, insulated
Dielectric voltage DC supply AC supply
Supply to input 2 kV 4 kV
Supply to output 4 kV 4 kV
Input to output 4 kV 4 kV
Rated operational power
AC 4 VA
DC 2 W
Supply Specifications
Reaction time (input signal variation from
-20% to +20% or from
+20% to -20% of set value)
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
Output relay ON LED, red
Environment (EN 60529)
Degree of protection IP 20
Pollution degree 3 (DIA01), 2 (PIA01)
Operating temperature -20 to 60°C, R.H. < 95%
Storage temperature -30 to 80°C, R.H. < 95%
Housing
Dimensions DIA01 22.5 x 80 x 99.5 mm
PIA01 36 x 80 x 94 mm
Weight Approx. 150 g
Screw terminals
Tightening torque Max. 0.5 Nm
acc. to IEC 60947
Approvals UL, CSA (except 748 models)
CE Marking Yes
EMC
Electromagnetic Compatibillity
Immunity According to EN 61000-6-2
Emission According to EN 61000-6-3
General Specifications
Specifications are subject to change without notice (18.09.06) 3
DIA01, PIA01
Operation Diagrams
N (-)
PE
µ
Z1
Y1
Y2
A1 A3
A211
12 14
24 VDC (+)
48/230 VAC 24/115 VAC
I
L
Latch/Hysteresis
adjustment
Example 1
Example 2
N(-)
24 VDC (+)
48/230 VAC 24/115 VAC
µ
Z1
Y1
Y2
A1A3
A2 11
1214
I
Hysteresis
adjustment
L
~
~
~
~
-
+
Example 1
N(-)
PE
µ
8
9
5
7
11
2
10 1
43
24 VDC (+)
48/230 VAC 24/115 VAC
I
L
Latch/Hysteresis
adjustment
Example 2
N(-)
24 VDC (+)
48/230 VAC 24/115 VAC
µ
89
5
7
101
43
I
Hysteresis
adjustment
L
11
2
~
~
~
~
+
-
Wiring Diagrams
DIA01 PIA01
Power supply
Set level
Relay ON
Hysteresis
Relay ON
Hysteresis
Set level
Latch ON
Power supply
24/48 VDC (+)
24/48 VDC (+)
24/48 VDC (+) 24/48 VDC (+)
22.5
80
83.5
99.5
63
28.5
36
80
94
28.5
63
90
Dimensions
DIN-rail Plug-in
