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Fuse protection for 24 V DC circuits
Contents
Fuse protection for 24 V DC circuits
Fuse protection for 24 V DC circuits
Overview
C.2
WAVEGUARD
C.4
C
2003670000
C.1
Fuse protection for 24 V DC circuits
Fuse protection for 24 V DC circuits – Overview
Fuse protection
A 24 V DC control voltage has become the standard in the
automation industry. Selective fuse protection is often used
when the power is being supplied by PLC-guided controllers.
It divides the total load into separate, logically connected
safety circuits. For example, the CPU, actuators and sensors
can be separated in the load circuits. This selective load
protection helps to decrease facility downtime and also to
simplify troubleshooting. When a disruption (short circuit)
occurs on a standard protective system, the entire power
supply is interrupted. In a system using selective fuse
protection, only the fuse in the one disrupted load circuit is
triggered. If the fuse is triggered quick enough so that other
loads (and particularly the CPU) can continue functioning
properly, then various control algorithms can be used to
deal with the disruption. It is then possible to shut down the
facility in an orderly and controlled fashion.
C
A fundamental problem when using ordinary fuses is
that they take a relatively long time to trigger. Usually, a
C.2
switched-mode power supply is already well over the surgecurrent limit (typically 120 % of Inom) before its fuse triggers.
Ordinary fuses are therefore not suitable for constructing a
selective fuse protective system. Such systems present DC
fuses with special challenges. They must be able to switch
off quickly enough but they must also be able to tolerate the
start-up surge currents from consumer loads. Weidmüller‘s
electronic fuses, from our established WAVEGUARD line,
are the answer to both of these challenges: they are quick
acting but can also tolerate start-up currents. You can easily
implement selective load protection using our WAVEGUARD
models.
In addition, Weidmüller‘s electronic fuses feature a floating
alarm contact and a reset input. This allows a PLC controller
to query the status of the fuse or to perform an automated
reset after troubleshooting. This provides you with a
convenient method for remotely maintaining a complex
facility. As a result, you save both time and money.
2003670000
Fuse protection for 24 V DC circuits
Fuse protection for 24 V DC circuits – Overview
Resetting
The WAVEGUARD family can be reset manually or by using
an external signal. They can be reset remotely by simply
applying a 24 V signal pulse on the reset input. The reset
occurs on the falling edge of the signal.
Note: A cyclical automatic reset is not permitted and can
lead to a malfunction.
BLOCK DIAGRAM WAVEGUARD
INPUT
24 V
Reset
(8)
(1)
(9)
gn
24 V
fail
C
re
(2)
0V
OUTPUT
(7)
(3)
NC contact
50 Vuc/0.05A
Signalling
A red LED displays when the electronic fuse has been
triggered. An alert is also sent out over a floating alarm
contact. A green LED signals that the unit is switched on.
The alarm contact uses an NC contact.
WAVEGUARD
2003670000
C.3
Fuse protection for 24 V DC circuits
WAVEGUARD
INPUT
24 V
Reset
C
24 V DC 3.15 A
24 V DC 1.6 A
0V
(8)
(1 )
(9 )
gn
rt
OUTPUT
24 V
fail
(7 )
(2 )
(3 )
NC contact
50 V uc /0.05 A
Current
(A )
Current
(A )
20
18
16
14
12
10
8
6
4
2
0
24
22
20
18
16
14
12
10
8
6
4
2
0
Time ( m s )
0
20
40
60
80
10 0
12 0
14 0
T i m e ( m s)
0 10 15 2 0 2 5 3 0 3 5 4 0 4 5 5 0 5 5 6 0 6 5 7 0
16 0
Technical data
Input
Rated control voltage
Rated current
Reset
Output
Status relay / CO contact
Signalling delay
General data
Ambient temperature (operational)
Storage temperature
Status indication
Standards
EMC standards
Sliding switch
Approvals
Dimensions
Clamping range (nominal / min. / max.)
Depth x width x height
Note
mm²
mm
Ordering data
Screw connection
Tension-clamp connection
24 V DC
1.6 A
Impulse > 100 ms +24 V, falling edge ON
24 V DC
3.15 A
Impulse > 100 ms +24 V, falling edge ON
NC contact, max. 50 V / 0.05 A; for low voltage only!
3.5 ms typ.
NC contact, max. 50 V / 0.05 A; for low voltage only!
3.5 ms typ.
0 °C...55 °C
-20 °C...85 °C
LED green: OK, LED red: tripped
DIN EN 50178
EN 55011, EN 61000-6-1, 2, 4
OFF - wait 10 s - ON; on / off
cCSAus; CE; cURus; EAC; GOSTME25
0 °C...55 °C
-20 °C...85 °C
LED green: OK, LED red: tripped
DIN EN 50178
EN 55011, EN 61000-6-1, 2, 4
OFF - wait 10 s - ON; on / off
cCSAus; CE; cURus; EAC; GOSTME25
2.5 / 0.5 / 2.5
1.5 / 0.5 / 2.5
92.4 / 22.5 / 72
92.4 / 22.5 / 72
Periodic
auto-reset not permitted; Tu=23 °C,Tension
single module
Screw connection
clamp connection
2.5 / 0.5 / 2.5
1.5 / 0.5 / 2.5
92.4 / 22.5 / 72
92.4 / 22.5 / 72
Periodic
auto-reset not permitted; Tu=23 °C,Tension
single module
Screw connection
clamp connection
Type
WGS 24Vdc 1,6A
WGZ 24Vdc 1,6A
Type
WGS 24Vdc 3,15A
WGZ 24Vdc 3,15A
Qty.
1
1
Order No.
8618890000
8621040000
Qty.
1
1
Order No.
8618910000
8621030000
Note
Accessories
Note
C.4
Supply voltage +24 V and 0 V can be cross-connected with ZQV 2.5 N/2
Supply voltage +24 V and 0 V can be cross-connected with ZQV 2.5 N/2
2003670000
24 V DC 6.3 A
INPUT
24 V
Reset
0V
(8)
(1 )
(9 )
gn
rt
24 V
fail
(7 )
(2 )
(3 )
24 V DC 8 A
Current
(A )
Current
(A )
OUTPUT
NC contact
50 V uc /0.05 A
26
24
22
20
18
16
14
12
10
8
6
4
Time (ms)
0
10
Fuse protection for 24 V DC circuits
WAVEGUARD
15 2 0 2 5 3 0 3 5 4 0 4 5 5 0 5 5 6 0
65
60
55
50
45
40
35
30
25
20
15
10
5
C
Time (ms)
0
5
10
15
20
25
30
35
40
45
50
Technical data
Input
Rated control voltage
Rated current
Reset
Output
Status relay / CO contact
Signalling delay
General data
Ambient temperature (operational)
Storage temperature
Status indication
Standards
EMC standards
Sliding switch
Approvals
Dimensions
Clamping range (nominal / min. / max.)
Depth x width x height
Note
mm²
mm
Ordering data
Screw connection
Tension-clamp connection
24 V DC
6.3 A
Impulse > 100 ms +24 V, falling edge ON
24 V DC
8A
Impulse > 100 ms +24 V, falling edge ON
NC contact, max. 50 V / 0.05 A; for low voltage only!
3.5 ms typ.
NC contact, max. 50 V / 0.05 A; for low voltage only!
3.5 ms typ.
0 °C...55 °C
-20 °C...85 °C
LED green: OK, LED red: tripped
DIN EN 50178
EN 55011, EN 61000-6-1, 2, 4
OFF - wait 10 s - ON; on / off
cCSAus; CE; cURus; EAC; GOSTME25
0 °C...55 °C
-20 °C...85 °C
LED green: OK, LED red: tripped
DIN EN 50178
EN 55011, EN 61000-6-1, 2, 4
OFF - wait 10 s - ON; on / off
cCSAus; CE; cURus; EAC; GOSTME25
2.5 / 0.5 / 2.5
1.5 / 0.5 / 2.5
92.4 / 22.5 / 72
92.4 / 22.5 / 72
Periodic
auto-reset not permitted; Tu=23 °C,Tension
single module
Screw connection
clamp connection
2.5 / 0.5 / 2.5
1.5 / 0.5 / 2.5
92.4 / 22.5 / 72
92.4 / 22.5 / 72
Periodic
auto-reset not permitted; Tu=23 °C,Tension
single module
Screw connection
clamp connection
Type
WGS 24Vdc 6,3A
WGZ 24Vdc 6,3A
Type
WGS 24Vdc 8,0A
WGZ 24Vdc 8,0A
Qty.
1
1
Order No.
8618930000
8621020000
Qty.
1
1
Order No.
8618940000
8621010000
Note
Accessories
Note
2003670000
Supply voltage +24 V and 0 V can be cross-connected with ZQV 2.5 N/2
Supply voltage +24 V and 0 V can be cross-connected with ZQV 2.5 N/2
C.5
Fuse protection for 24 V DC circuits
WAVEGUARD
24 V DC 0.5...5 A
INPUT
24 V
Reset
C
0V
(8)
(1 )
(9 )
gn
rt
OUTPUT
24 V
fail
(7 )
(2 )
(3 )
NC contact
50 V uc /0.05 A
Technical data
Derating curve
Input
Rated control voltage
Rated current
Reset
Output
Status relay / CO contact
Signalling delay
General data
Ambient temperature (operational)
Storage temperature
Status indication
Standards
EMC standards
Sliding switch
Approvals
Dynamic tripping characteristic
24 V DC
0.5...5 A adjustable
Impulse > 100 ms +24 V, falling edge ON
Tripping current: 0.5 A
Tripping current (A)
25
20
15
10
5
0
0
20
40
NC contact, max. 50 V / 0.05 A; for low voltage only!
3.5 ms typ.
0 °C...55 °C
-20 °C...85 °C
LED green: OK, LED red: tripped
DIN EN 50178
EN 55011, EN 61000-6-1, 2, 4
OFF - wait 10 s - ON; on / off
cCSAus; CE; cURus; EAC; GOSTME25
mm²
mm
Ordering data
Screw connection
Tension-clamp connection
80
100
120
140
60
80
100
120
140
Time (ms)
Tripping current: 5.0 A
Tripping current (A)
25
20
15
10
5
0
0
20
40
Dimensions
Clamping range (nominal / min. / max.)
Depth x width x height
Note
60
Time (ms)
2.5 / 0.5 / 2.5
1.5 / 0.5 / 2.5
92.4 / 22.5 / 72
92.4 / 22.5 / 72
Periodic
auto-reset not permitted; Tu=23 °C,Tension
single module
Screw connection
clamp connection
Type
WGS 24Vdc 0.5...5A
WGZ 24Vdc 0.5...5A
Qty.
1
1
Order No.
8710270000
8727630000
Note
Accessories
Note
C.6
Supply voltage +24 V and 0 V can be cross-connected with ZQV 2.5 N/2
2003670000
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