Electronic circuit breaker EBU
Description
The electronic circuit protector type EBU (Electronic Breaker Unit)
provides selective overcurrent protection in AC 230 V UPS systems.
It consists of an MCB approved for short circuit interruptions up to
10 kA and of an add-on electronic circuitry, taking over measuring
and evaluation tasks. The product is available with the typical MCB
ratings 4 A, 6 A, 10 A and 16 A with B and C characteristics and is
directly operated at the output of the corresponding UPS.
UPS units often do not supply sufficient power in the event of a short
circuit to trip standard MCBs. The electronic AC circuit breaker can
individually be adjusted to the UPS unit and will therefore reliably trip
in the event of a short circuit. Optimal adjustment of the load’s current
rating allows detection and disconnection of an overload in the load
circuit. This helps exclude the fatal disconnection of the entire output
voltage of the UPS unit.
The Electronic Breaker Unit EBU allows a reduction in size of one
third for UPS units because power reserves do no longer have to
be kept available for tripping. The EBU increases system availability,
reduces overall costs and simplifies electrical planning.
Technical data
Rated voltage UN
Current ratings IN
Frequency
AC 230 V 10ꢀ
4 A, 6 A, 10 A, 16 A
50 Hz
Typical applications
Rated insulation voltage AC 250 V
Rated voltage and
current rating range of
the auxiliary contact
DC 110 V / 0.3 A – 33 W
Electronic overcurrent protection by means of electronic AC circuit
breakers is ideally suited to the selective protection of uninterruptible
power supplies (UPS) in industrial plants. EBU ensures the power
safety provided by AC UPS systems.
DC 30 V / 1.1 A – 33 W
AC 120 V / 0.5 A – 60 VA
AC 240 V / 0.25 A – 60 VA
Min. load of aux. contact 3 mA at 24 V
(valid for standard
industrial surroundings,
no aggressive gases)
Benefits
Reference ambient
temperature
-35 °C...+60 °C
S-type
l Enhanced system availability through effective protection
l Reduction of overall costs by a 1/3 more efficient rating
l Easy planning with a variable overcurrent protection
Method of operation
Mode of trip / degree
of trip-free behaviour
mechatronic / trip free
(positively trip-free)
4
Order numbering code
Max.* cable length (outgoing wire) from generator to EBU
B6
B10
B16
C4
C6
C10
C16
Type No.
EBU Electronic circuit breaker for AC UPS applications
31 m/
mm2
19 m/
mm2
12 m/
mm2
24 m/
mm2
17 m/
mm2
10 m/
mm2
6 m/
mm2
Mounting method
T
rail mounting
Typical electrical operational values
Design
A adjustability IN UPS + IN load
Number of poles
Voltage drop in V at 1 x IN
IN (A)
V
4
6
10
16
1
2
1-pole, 1-pole protected electronically
2-pole, 1-pole protected electronically
Version
0,77
0,53
0,35
0,3
Insulation co-ordination Rated impulse voltage 4 kV;
0
with physical isolation by means of MCB 4230-T
(except signalling)
overvoltage category III; pollution
degree 2; reinforced insulation in the
actuating area
Signal input
0
without signal input
Signal output
3
auxiliary change-over contact
Operating voltage
Insulation co-ordination Rated impulse voltage: 2.5 kV
of the signalling
AC 230 V
voltage rating AC 230 V
Characteristic curve
Note: The Si contacts are not suitable for connection to SELV
control voltage.
B
thermal 1.05 - 1.30 IN;
magnetic 3.2 - 4.8 IN
thermal 1.05 - 1.30 IN;
magnetic 6.4 – 9.6 IN
Current rating range
4 A (only Characteristic curve C)
6 A
Insulation resistance
Degree of protection
Endurance
> 100 MOhm (DC 500 V)
II
C
mechanical (contacts)
electronic
potentiometer
20,000 cycles
> 15 years within specification
min. 1000 steps
10 A
16 A
EBU10 -T A 1 - 0
0
3 - AC 230 V - C - 10 A
ordering example
Preferred types Characteristic curve C
1638
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