2
Specifications are subject to change without notice (09.06.2021)
DWB03, PWB03
Supply Specifications
General Specifications
Power supply
Overvoltage cat. III
Rated operational voltage
(IEC 60664, IEC 60038)
Through terminals:
DWB03:
L1, L2, L3
PWB03:
5, 6, 7
M23
177 to 276 VAC 45 to 65 Hz
DWB03CM48
323 to 552 VAC 45 to 65 Hz
PWB03CM48
323 to 477 VAC 45 to 65 Hz
DWB03CM69
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 (DWB03), 2 (PWB03)
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
DWB03
45 x 80 x 99.5 mm
PWB03
36 x 80 x 94 mm
Material
PA66 or Noryl
Weight
Approx. 250 g
Screw terminals
Tightening torque
Max. 0.5 Nm
acc. to IEC 60947
Product standard
EN 60255-6
Approvals
UL, CSA
CE Marking
L.V. Directive 2006/95/EC
EMC Directive 2004/108/EC
EMC
Immunity
According to EN 60255-26
According to EN 61000-6-2
Emissions
According to EN 60255-26
According to EN 61000-6-3
Mode of Operation
DWB03 and PWB03 meas-
ure the active power of a
3-phase balanced system.
The relay has an adjustable
power ON delay in order to
avoid undesired overload
detection during motor start.
Example 1
Latching mode, relay NE.
In this application DWB03
or PWB03 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 meas-
ure power. If it is within the
setpoints, 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
Latching mode, relay NE.
Monitoring the correct
power flow of a generator.
DWB03 and PWB03 react
as described in the pre-
vious example 1. Setting
underpower setpoint at 0
allows to protect the gener-
ator both from overload and
from becoming a motor (i.e.;
supplied by other devices
in the system) allowing, for
example, to disconnect it in
such an event.
Example 3
Start/stop mode, relay NE.
In this application DWB03
or PWB03 are directly con-
nected 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
measure the active power. If
it is within the setpoints the
relay is energized. As soon
as the power drops below
the lower setpoint or raises
above the upper setpoint
Output Specifications
Output
SPDT relay
Rated insulation voltage
250 VAC
Contact ratings
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 10
6
operations
Electrical life
≥ 50 x 10
3
operations
(at 8 A, 250 V, cos
j
= 1)
Dielectric strength
Dielectric voltage
≥ 2 kVAC (rms)
Rated impulse withstand volt. 4 kV (1.2/50 µs)
