Carlo Gavazzi DIA01, PIA01 Technical data

Specifications are subject to change without notice (21.11.05) 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 resistance: 0.05 Ω

Max. current: 6 A
Max. current for 1 s: 25 A

Standard CT (examples) AAC

rms

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 (AgSnO

2

)µ

Resistive loads AC 1 8 A @ 250 VAC

DC 12 5 A @ 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 ≥ 10

5

operations

(at 8 A, 250 V, cos ϕ = 1)

Operating frequency ≤ 7200 operations/h
Dielectric strength

Dielectric voltage

≥ 2 kVAC (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 monitor­ing 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

2 Specifications are subject to change without notice (21.11.05)

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 cur­rents up to 6000 A when
connected to a suitable cur­rent transformer.

Example 1

(connection between termi­nals Z1, Y1 or 8, 9 - latch
function enabled)

The relay operates and latch­es in operating position
when the measured value
exceeds the set level. Pro­vided that the current has
dropped min. 4% below the
set point (see hysteresis) the
relay releases when the inter-

connection between termi­nals Z1, Y1 or 8, 9 is inter­rupted or the power supply
is interrupted as well.

Example 2 (Stardard CT)

(no connection between ter­minals 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%

45 to 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

DIN-rail version 22.5 x 80 x 99.5 mm
Plug-in version 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 Ye s
EMC

Electromagnetic Compatibillity

Immunity According to EN 61000-6-2
Emission According to EN 61000-6-3

General Specifications