PTC thermistors for overcurrent
protection and as inrush current limiters
Leaded disks, 260 V up to 1000 V
Series/Type:
Date:
B597**C0... / B594**C1...
February 2018
© EPCOS AG 2018. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
Overcurrent protection and inrush current limiting
Leaded disks, 260 V up to 1000 V
Applications
Inrush current limiter for smoothing and
DC link capacitors
To replace high-power fixed resistors for
capacitor charging
Overcurrent and short circuit protection
Features
Lead-free terminals
Self-protecting in case of malfunction of
short-circuit relay or internal short circuit of
capacitor
Inrush current limiters are not damaged
when directly connected to V
max
even without
additional current limitation
Marking: Type, manufacturer's logo,
reference temperature in
°C
and date code
YYWW
UL approval to UL 1434 (file number
E69802) for ICL application selected types;
V
max
= 480 V and V
R
= 400 V for C755
UL approval to UL 1434 (file number
E69802) for overcurrent protection
V
max
= 420 V and V
R
= 380 V, except type
C758, C1412 and C1451
VDE approval (licence number 40040539)
for ICL applications and for overcurrent
protection selected types
(licence number 104843)
IECQ certificate (file number 101-QA-13) for
ICL applications and for overcurrent
protection selected types
(file number 101-QA-2)
Qualification based on AEC-Q200, Rev. D
for B59412C1130B070 and
B59451C1130B070
RoHS-compatible
Delivery mode
Cardboard strips (standard)
Cardboard tape reeled or in Ammo pack on
request
Dimensional drawing with coating,
C14** and C7**
Dimensional drawing without coating,
B750 and B770
Dimensions in mm
Type
w
max
h
max
B750 12.5 16.5
B770
8.5 12.0
C1412 15.0 19.0
C1451 15.0 19.0
C750 13.0 18.0
C751 13.0 18.0
C752 13.0 18.0
C753 13.0 18.0
C754 13.0 18.0
C755 13.0 18.0
C758 13.0 18.0
C770
9.0 13.5
C771
9.0 13.5
C772
9.0 13.5
C773
9.0 13.5
C774
9.0 13.5
l
min
35
25
35
35
35
35
25
25
25
35
35
25
25
25
25
25
th
max
5.0
7.0
7.5
7.5
5.5
7.5
7.5
7.5
7.5
7.5
7.5
7.5
7.5
7.5
7.5
7.5
∅d
0.6
0.6
0.8
0.8
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 2 of 23
Overcurrent protection and inrush current limiting
Leaded disks, 260 V up to 1000 V
General technical data for inrush current limiters
Operating cycles at V
max
Switching cycles at V
max
Operating temperature range
Operating temperature range
(charging of capacitor)
(failure mode)
(V = 0)
(V = V
max
)
N
c
N
f
T
op
T
op
> 100.000
> 100
40/+125
20/+85
cycles
cycles
°C
°C
Electrical specifications and ordering codes for inrush current limiters
Type
V
max
V
link,max
R
R
Ω
70
120
150
25
50
80
56
120
150
500
1100
120
500
∆R
R
T
ref
C
th
(typ.)
%
°C
J/K
±25
±25
±25
±25
±25
±25
±25
±25
±25
±25
±25
±25
±25
120
120
120
120
120
120
130
120
120
120
115
130
115
0.4
0.6
0.6
1.0
1.4
1.4
2.1
1.4
1.4
0.6
0.6
2.1
1.4
τ
th
s
70
80
80
100
120
120
100
120
120
80
80
100
120
2
2
2
2
2
2
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
Circuit
diagram
Approvals Ordering code
IECQ
B59770C0120A070
B59771C0120A070
B59772C0120A070
B59750C0120A070
B59751C0120A070
B59752C0120A070
B59451C1130B070
B59753C0120A070
B59754C0120A070
B59773C0120A070
B59774C0115A070
B59412C1130B070
B59755C0115A070
V AC V DC
C770
C771
C772
C750
C751
C752
C1451
C753
C754
C773
C774
C1412
C755
260
260
260
280
280
280
440
440
440
440
440
480
560
370
370
370
400
400
400
620
620
620
620
620
680
800
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 3 of 23
Overcurrent protection and inrush current limiting
Leaded disks, 260 V up to 1000 V
Circuit diagrams
Three phases circuit
Single phase circuit
DC circuit
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 4 of 23
Overcurrent protection and inrush current limiting
Leaded disks, 260 V up to 1000 V
Calculation of the number of required PTC elements
Number of required PTC elements (connected in parallel) as function of capacitance and charging
voltage of smoothing or DC link capacitor:
K
K factor
K = 1 for DC source
K = 0.96 for 3-phase bridge rectifier
K = 0.76 for single phase bridge rectifier
Number of required PTC thermistors connected in parallel
Capacitance of smoothing or DC link capacitor in F
Charging voltage of capacitor in V
Heat capacity in J/K
Reference temperature of PTC in
°C
Expected maximum ambient temperature in
°C
N
C
V
C
th
T
ref
T
A,max
In case of large N values the resulting resistance of the parallel PTC network might be too low for
effective limitation of the charging current. In this case a combination of series and parallel
connected PTC thermistors can be used.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 5 of 23
