Monitoring Relays
1-Phase AC/DC Over Current
Types DIA01, PIA01
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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
DIA01
PIA01
Product Description
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.
Ordering Key
Housing
Function
Type
Item number
Output
Power supply
Range
DIA 01 C B23 5A
Type Selection
Mounting
DIN-rail
Plug-in
Output
SPDT
SPDT
Supply: 24 VDC
DIA 01 C 724 5A
PIA 01 C 724 5A
Supply: 48 VDC
DIA 01 C 748 5A
PIA 01 C 748 5A
Supply: 24/48 VAC
DIA 01 C B48 5A
PIA 01 C B48 5A
Supply: 115/230 VAC
DIA 01 C B23 5A
PIA 01 C B23 5A
Input Specifications
Input
(current level)
DIA01
PIA01
Measuring ranges
Direct
..5A:
0.5 to 5 A AC/DC
Max. current for 1 s
Standard CT (examples)
TADK2
50 A/5 A
TAD2
150 A/5 A
TAD6
400 A/5 A
TAD12
1000 A/5 A
TACO200
6000 A/5 A
Contact input
DIA01
PIA01
Disabled
Enabled
Latch disable
Note:
The input voltage cannot
raise over 300 VAC/DC with
respect to ground (PIA only)
Terminals Y1, Y2
Terminals 5, 7
Internal resist.
0.05
Ω
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
Terminals 8, 9
> 10 kΩ
< 500
Ω
> 500 ms
Max. curr.
6A
25 A
Max. curr.
60 A
180 A
480 A
1200 A
7200 A
Output Specifications
Output
Rated insulation voltage
Contact ratings
(AgSnO
2
)
AC 1
Resistive loads
DC 12
Small inductive loads AC 15
DC 13
Mechanical life
Electrical life
SPDT relay
250 VAC
µ
8 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 8 A, 250 V, cos
ϕ
= 1)
≤
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 (18.09.06)
1
DIA01, PIA01
Supply Specifications
Power supply
Rated operational voltage
through terminals:
A1, A2 or A3, A2 (DIA01)
2, 10 or 11, 10
(PIA01)
724:
748:
B48:
B23:
Dielectric voltage
Supply to input
Supply to output
Input to output
Rated operational power
AC
DC
Overvoltage cat. III
(IEC 60664, IEC 60038)
General Specifications
Reaction time
Alarm ON delay
Alarm OFF delay
Accuracy
Temperature drift
Repeatability
Indication for
Power supply ON
Output relay ON
Environment
Degree of protection
Pollution degree
Operating temperature
Storage temperature
Housing
Dimensions
DIA01
PIA01
Weight
Screw terminals
Tightening torque
Approvals
CE Marking
EMC
Immunity
Emission
(input signal variation from
-20% to +20% or from
+20% to -20% of set value)
< 100 ms
< 300 ms
(15 min warm-up time)
± 1000 ppm/°C
± 0.5% on full-scale
LED, green
LED, red
(EN 60529)
IP 20
3 (DIA01), 2 (PIA01)
-20 to 60°C, R.H. < 95%
-30 to 80°C, R.H. < 95%
22.5 x 80 x 99.5 mm
36 x 80 x 94 mm
Approx. 150 g
Max. 0.5 Nm
acc. to IEC 60947
UL, CSA (except 748 models)
Yes
Electromagnetic Compatibillity
According to EN 61000-6-2
According to EN 61000-6-3
24 VDC ± 20%, insulated
48 VDC ± 20%, insulated
24/48 VAC ± 15%
45 to 65 Hz, insulated
115/230 VAC ± 15%
45 to 65 Hz, insulated
DC supply
AC supply
2 kV
4 kV
4 kV
4 kV
4 kV
4 kV
4 VA
2W
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.
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
22 kΩ
50%:
75%:
15 kΩ
Latch: < 500
Ω
2
Specifications are subject to change without notice (18.09.06)
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