Specifications are subject to change without notice (09.12.05)

Monitoring Relays
3-Phase Active power
Types DWB02, PWB02

· TRMS active power relays for three phase

balanced applications

· Measuring if active power is within set limits
· Measuring voltage on own power supply
· Measuring ranges: 5A, 10A, MI current transformers
· Power ON delay 1 to 30 s knob selectable
· Separately adjustable upper/lower level on relative

scale

· Programmable latching or inhibit at set level
· Automatic and manual start and stop of the system
· Output: 8 A SPDT relay N.D. or N.E. selectable
· For mounting on DIN-rail in accordance with DIN/EN

50 022 (DWB02) or plug-in module (PWB02)

· 45 mm Euronorm housing (DWB02) or 36 mm plug-in

module (PWB02)

· LED indication for relay, alarm and power supply ON

Product Description

DWB02 and PWB02 are
precise TRMS active power
monitoring relays for 3-
phase balanced systems.
They can be used for moni-
toring the actual load of
asynchronous motors and
other symmetrical loads, as
well as the power consump-
tion by of system.
Start/stop input allows to use
a manual switch to start and

stop the system, without the
need of an auxiliary device.
The advantage of using the
latch function is that the alarm
status can be kept even after
the end of the alarm condi-
tion. Inhibit function can be
used to avoid relay operation
when not desired (mainte-
nance, transitions).
The LED's indicate the state of
the alarm and the output relay.

Input Specifications

Input

Voltage (Own power supply):
3 - phase

DWB02:

L1, L2, L3

PWB02:

5, 6, 7

M23:

208 to 240 VAC ± 15%

DWB02CM48:

380 to 480 VAC ± 15%

PWB02CM48:

380 to 415 VAC ± 15%

DWB02CM69:

600 to 690 VAC ± 15%

1- phase

DWB02CM23:

L1, L2

PWB02CM23:

5, 6
208 to 240 VAC ± 15%

Current:

DWB02:

5A, 10A: I1, I2
MI...:U1, U2

PWB02:

5A, 10A: 11, 10
MI...: 9, 8

Measuring ranges

Upper level

Lower level

Active power

10 to 110 %

AACrms

Max. curr.
(30s)

Direct input:

0.5 to 5A

30A

1 to 10A

50A

Standard CT (examples)
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

MI CT ranges
MI 100

10 to 100 A

250 AAC

MI 500

50 to 500 A

750 AAC

Note:

The input voltage cannot
raise over 300 VAC with
respect to ground (PWB02
only)

Contact input

DWB02

Terminals Z1, U2

PWB02

Terminals 2, 9

Disabled

> 10 k

Enabled

< 500

Pulse width

> 500 ms

Hysteresis

~ 2% of set value - fixed

DWB02

PWB02

Ordering key

Housing
Function
Type
Item number
Output
Power Supply
Range

DWB 02 C M48 10A

Type Selection

Mounting

Output

Supply: Supply:

Supply:

208 to 240 VAC

380 to 415 VAC

380 to 480 VAC

600 to 690 VAC

DIN-rail

SPDT

DWB 02 C M23 10A

DWB 02 C M48 10A

DWB02 C M69 10A

Plug-in

SPDT

PWB 02 C M23 10A

PWB 02 C M48 10A

Specifications are subject to change without notice (09.12.05)

DWB02, PWB02

Supply Specifications

General Specifications

Power supply

Overvoltage cat. III

Rated operational voltage

(IEC 60664, IEC 60038)

Through terminals:

DWB02:

L1, L2, L3

PWB02:

5, 6, 7

M23

177 to 276 VAC 45 to 65 Hz

DWB02CM48

323 to 552 VAC 45 to 65 Hz

PWB02CM48

323 to 477 VAC 45 to 65 Hz

DWB02CM69

510 to 793 VAC 45 to 65 Hz

Dielectric voltage supply to output 4 kV

Rated operational power

M23

9 VA @ 230 V, 50 Hz

M48

13 VA @ 400 V, 50 Hz

M69

21 VA @ 600 V, 50 Hz

Supplied by

L1 and L2

Power ON delay

1 to 30 s ± 0.5 s

Reaction time

(input signal variation from
-20% to +20% or from
+20% to -20% of set value)

Alarm ON delay

< 250 ms

Alarm OFF delay

< 250 ms

Accuracy

(15 min warm-up time)

Temperature drift

± 1000 ppm/°C

Delay ON alarm

± 10% on set value ± 50 ms

Repeatability

± 0.5% on full-scale

Indication for

Power supply ON

LED, green

Alarm ON

LED, red (flashing 2 Hz
during delay time)

Output relay ON

LED, yellow

Environment

Degree of protection

IP 20

Pollution degree

3 (DWB02), 2 (PWB02)

Operating temperature

@ Max. voltage, 50 Hz

-20 to +60°C, R.H. < 95%

@ Max. voltage, 60 Hz

-20 to +50°C, R.H. < 95%

Storage temperature

-30 to +80°C, R.H. < 95%

Housing dimensions

DIN-rail version

45 x 80 x 99.5 mm

Plug-in version

36 x 80 x 94 mm

Weight

Approx. 250 g

Screw terminals

Tightening torque

Max. 0.5 Nm
acc. to IEC 60947

Approvals

UL, CSA

CE-Marking

Yes

EMC

Electromagnetic Compatibility

Immunity

According to EN 61000-6-2

Emission

According to EN 61000-6-3

Mode of Operation

DWB02 and PWB02 mea-
sure the active power of a 3-
phase balanced system. The
relay has an adjustable pow-
er ON delay in order to avoid
undesired overload detec-
tion during motor start.

Example 1
Latching mode, relay NE
In this application DWB02 or
PWB02 is connected to an
external current metering
transformer, type MI..., (con-
nected between U1 & U2) as
well as to a 3-phase asyn-
chronous motor. The relay is
energized as soon as the
power supply is applied.
After the power ON delay,
the unit starts to measure
power. If it is within the set-
points, the relay is ener-

gized, and the yellow LED is
ON. As soon as the power
drops below the lower set-
point or raises above the
upper setpoint the output
relay releases after the set
time has expired. To restart
the measurement, connect
Z1 and U1 (2 and 9) or inter-
rupt the power supply for at
least 1 s.

Example 2
Non-latching mode, relay
NE.
DWB02 and PWB02 react
as described in the previous
example 1 except that the
relay reactivates automati-
cally as soon as active pow-
er is back within the two
setpoints again. When the
measured power rises

above the adjusted upper
level, the red LED starts
flashing, and the output
relay releases after the set
time period. When the mea-
sured power drops below
the adjusted lower level, the
red LED starts flashing, and
the output relay releases
after the set time period.

Example 3:
DWB02CM2310A and
PWB02CM2310A can be
used for monitoring the
power of a 1-Phase load
with 208 to 240 V AC mains
voltage. In this case the
power supply has to be con-
nected between L1, L2 (or 5,
6); L2 and L3 (or 6 and 7)
have to be interconnected.

Example 4
Start/stop mode, relay NE.
In this application DWB02 or
PWB02 are directly connect-
ed to a 3-phase asyn-
chronous motor. The relay is
energized as soon as the
power supply is applied and
the start/stop contact is
closed. After the power ON
delay, the unit starts to mea-
sure the active power. If it is
within the setpoints the relay
is energized. As soon as the
power drops below the low-
er setpoint or raises above
the upper setpoint the out-
put relay releases and the
red LED turns on after the
set time has expired. When
the start/stop contact is
opened the relay is immedi-
ately de-energized. To

Output Specifications

Output

SPDT relay

Rated insulation voltage

250 VAC

Contact ratings (AgSnO

)

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 10

operations

Electrical life

operations

(at 8 A, 250 V, cos

= 1)

Operating frequency

7200 operations/h

Dielectric strength

Dielectric voltage

2 kVAC (rms)

Rated impulse withstand volt. 4 kV (1.2/50 µs)

Specifications are subject to change without notice (09.12.05)

DWB02, PWB02

Function/Range/Level/Time Setting

Select the desired function
setting the DIP-switches 1
to 4 as shown on the right.
Adjust the input range set-
ting the DIP-switches 5 and
6. To access the DIP-
switches open the plastic
cover using a screwdriver as
shown below.
If DIP switch 3 is set to ON
(start/stop) the position of
DIP switch 4 does not affect
the products' working
mode.

Center knobs:
Setting of upper and lower-
level from 10 to 110% of
nominal power.

Lower left knob:
Setting of delay on absolute
scale: 0.1 to 30 s.
Lower right knob:
Setting of power ON delay
on absolute scale: 1 to 30 s.

Measuring range

SW5

OFF

SW6

OFF

M23

208 VAC

220 VAC

230 VAC

240 VAC

M48

380 VAC

400 VAC

415 VAC

480 VAC

DWB02 only

M69

600 VAC

690 VAC

600 VAC

690 VAC

Contact input (SW3 OFF)

ON:

Latch function enable

OFF:

Inhibit function enable

Working mode

ON:

Contact input for start/stop functions

OFF:

Contact input for latch/inhibit functions

Input current range (terminals I1, I2 or 10, 11)

ON:

10A

OFF:

5A/MI

Relay status

ON:

Relay de-energized in normal condition

OFF:

Relay energized in normal condition

Contact input working mode

CLOSED

OPEN

LATCH

NOT ACTIVE

ACTIVE

INHIBIT

ACTIVE

NOT ACTIVE

START/STOP

START

STOP

Mode of Operation (cont)

restart the system just con-
nect the start/stop contact.

Note 1: to use the start/stop
function the output relay has
to command a contactor in
series to the load (see last
two wiring diagrams).

Note 2 (3-phase voltage):
connect the 3-phase power
supply to the terminals L1,
L2 and L3 (DWB02) - 5, 6
and 7 (PWB02) taking care
of the sequence.

L2 L3

U1
U2

Contact input

DWB02

6 7

9
8

Contact input

PWB02

Notes
1. DIP-switch 3 set ON enables the start/stop function

that is managed by the closing-opening of the
contact input.

2. DIP-switch 3 set OFF enables the input contact

for the latch/inhibit functions: the selection between
these is allows by the DIP switch 4.

The following table shown as the input contact man-
ages the mode of operation:

Specifications are subject to change without notice (09.12.05)

Operation Diagrams

Latch function - NE relay

Inhibit function - ND relay

DWB02, PWB02

Power supply

Latch contact
(Closed = latch not active)
Upper level

Hysteresis

Active power

Power

Lower level

Relay ON

Power supply

Inhibit contact
(Closed = inhibit active)
Upper level

Hysteresis

Active power

Lower level

Relay ON

L2 L3

U1
U2

6 7

9
8

PWB02 - Direct connection - Manual start and stop (NE relay)

DWB02 - Direct connection - Manual start and stop (NE relay)

Start/stop

Contact

Start/stop

Contact

Wiring Diagrams (cont.)

With the start/stop function enabled, it's necessary to use the following wiring diagrams (which are two examples among
many others). It is possible for both 3-phases loads and of 1-phase loads, either through direct connection or external cur-
rent metering transformer.

Start and stop function - NE relay

Power

Power supply

Start/Stop contact
(Closed = Start; Open = Stop)
Upper level

Hysteresis

Active power

Lower level

Relay ON

Power ON

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