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Radial Leaded PTC
0ZRS Series
0ZRS Series
RoHS 2 Compliant
AEC-Q
Compliant
Product Features
- Very Low resistance, Very High hold current, Solid state, Radial leaded product
ideal for up to 32V and Operating temperatures up to 125° C.
- AEC-Q Compliant
- Meets Bel automotive qualification*
* - Largely based on internal AEC-Q test plan
Operating (Hold Current) Range
500mA - 10A
Maximum Voltage
32V
Temperature Range
-40° C to 125° C
Agency Approval
TUV (Std. EN/IEC 60738-1-1 and EN/IEC 60730-1, Cert. R50102187)
UL Recognized Component (Std. UL1434, File E305051)
Electrical Characteristics (23 )
LEAD FREE =
HALOGEN FREE =
Part Number
(Bulk)
Hold Trip Rated
Current Current Voltage
IH, A
IT, A Vmax, Vdc
Max
Current
Imax, A
Typical
Power
Pd, W
Max Time to Trip Resistance Tolerance Agency Approvals
Current
A
Time
Sec
Rmin
Ohms
R1max
Ohms
A 0ZRS0050FF1E
0.5
1.0
32
100 0.9 2.5 3.0 0.3500 1.1000 Y
Y
B 0ZRS0070FF1E
0.7
1.4
32
100 1.4 3.5 3.2 0.2300 0.8000 Y
Y
C 0ZRS0100FF1E
1.0
1.9
32
100 1.4 5.0 6.2 0.1500 0.4300 Y
Y
D 0ZRS0200FF1E
2.0
4.0
32
100 2.2 10.0 5.5 0.0650 0.2500 Y
Y
E 0ZRS0300FF1A
3.0
6.0
32
100 3.2 15.0 5.0 0.0350 0.1100 Y
Y
F 0ZRS0500FF1A 5.0 10.0
32
100 5.3 25.0 9.0 0.0150 0.0400 Y
Y
G 0ZRS0750FF1A 7.5 15.0
32
100 6.5 37.5 13.0 0.0074 0.0230 Y
Y
H 0ZRS1000FF1A 10.0 20.0
32
100 7.0 50.0 15.0 0.0060 0.0160 Y
Y
IH Hold Current- The maximum current at which the device will not trip in still air at 23° C.
IT Trip current- The minimum current at which the device will trip in still air at 23° C.
Vmax Maximum voltage device can withstand at its rated current without suffering damage.
Imax Maximum fault current device can withstand at rated voltage (Vmax) without damage.
Pd Typical power dissipated by device when in tripped state in 23° C still air environment.
Rmin Minimum device resistance at 23° C in initial un-soldered state.
R1max Maximum device resistance at 23° C, 1 hour after initial device trip, or after being soldered to PCB in end application.
Specifications subject to change without notice
belfuse.com/circuit-protection

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Type 0ZRS Series
2/4
PTC’s – Basic Theory of Operation / “Tripped” Resistance Explanation
A Bel PTC consists of a block of polymeric material containing conductive carbon granules which is
sandwiched between two conductive metal plates. When this polymer block reaches approximately 125C,
either due to current passing through it via conductive chains of carbon particles or due to an external heat
source; it swells volumetrically. This expansion breaks apart a majority of the chains of carbon granules that
run randomly between the two conductive plates. This behavior results in a sharp increase in resistance
across the two plates which all but eliminates current flow through the device, allowing just enough residual
current flow to maintain the block’s internal temperature at 125C. Once this “tripped” state current is cut off,
the polymer brick cools and shrinks to its original size, thereby allowing its broken carbon chains to
reestablish themselves and permit the part to return to its low resistance state. Once cooled to room
ambient, the PTC will once again exhibit a resistance less than its “R1max” rating.
At currents below the device IHOLD rating, AND at temperatures below 100C, the PTC maintains a
resistance value below its R1 MAX rating.
The catalog data for each device specifies a "Typical Power" value. This is the power required to exactly
match the heat lost by the tripped device to its ambient surroundings at 23C. By Ohm's Law, power can be
stated as: W = E²/R. Thus the approximate resistance of a “Tripped” PTC can be determined by: R = E²/W,
where "E" is the voltage appearing across the PTC (usually the supply's open circuit voltage), and "W" is the
Typical Power value for the particular PTC.
Since the PPTC acts to maintain a constant internal temperature, its apparent resistance will change based
upon applied voltage and, to a lesser degree, ambient conditions. Consider the following example....
A PTC with a Typical Power of 1 watt protecting a circuit using a 60V supply will demonstrate an apparent,
tripped resistance "R" of:
R = 60²/1 = 3,600 ohms
This same tripped device when used to protect a 12V circuit would now present an apparent resistance of:
R = 12²/1 = 144 ohms
The value for Typical Power is "typical" because any physical factors that affect heat loss (such as ambient
temperature or air convection) will somewhat alter the level of power that the PTC needs to maintain its
internal temperature. In short, PTCs do not exhibit a constant, quantifiable tripped resistance value.
Average Time Current Characteristic Curve at 23°C
The Average Time Current Characteristic Curve and Temperature Rerating Curve are affected by a number of variables and these curves are
provided for guidance only.
Specifications subject to change without notice
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302 USA
© 2019 Bel Fuse, Inc.
+1 201.432.0463
Bel.US.CS@belf.com
belfuse.com/circuit-protection
Rev. 0ZRS Sep2019

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Type 0ZRS Series
3/4
Physical Specifications
Lead material:
0ZRS0050FF- 0ZRS0100FF Tin plated copper, 24 AWG.
0ZRS0200FF- 0ZRS0750FF Tin plated copper, 20 AWG
0ZRS1000FF Tin plated copper, 18 AWG.
Soldering charactcristics
MIL-STD-202, Method 208H.
Insulating coating
Flame retardant epoxy, meets UL-94V-0 requirement.
PTC Marking
“bel” or “b”, , IH code and “RS”.
Product Dimensions
Part Number
0ZRS0050FF
0ZRS0070FF
0ZRS0100FF
0ZRS0200FF
0ZRS0300FF
0ZRS0500FF
0ZRS0750FF
0ZRS1000FF
All dimensions in mm.
AB
C DE
Fig.
Max Max Typical Min Max
1 7.4 12.7 5.1 7.6 3.3
2 6.9 10.8 5.1 7.6 3.0
1 9.7 13.6 5.1 7.6 3.0
3 9.5 13.5 5.1 7.6 3.0
3 10.2 15.5 5.1 7.6 3.8
3 14.0 24.1 5.1 7.6 3.8
3 21.1 24.9
10.2
7.6 3.8
4 23.5 27.9
10.2
7.6 4.0
Temperature Derating Table
I Hold Value
0ZRS
-40
138%
-20
127%
Thermal Derating Curve
0
115%
160%
140%
120%
100%
80%
60%
40%
20%
0%
-40
Temperature Derating Curve
-20 0
20 40 60 80
Temperature(°C)
100
Temperature Derating
23 30 40 50
100% 96% 90% 80%
60
70%
70
63%
85
53%
125
21%
Cautionary Notes
1. Operation beyond the specified maximum ratings or improper use
may result in damage and possible electrical arcing and/or flame.
2. These Polymer PTC (PPTC) devices are intended for protection
against occasional overcurrent/overtemperature fault conditions
and may not be suitable for use in applications where repeated
and/or prolonged fault conditions are anticipated.
3. Avoid contact of PTC device with chemical solvent. Prolonged
contact may adversely impact the PTC performance.
4. These PTC devices may not be suitable for use in circuits with a
large inductance, as the PTC trip can generate circuit voltage
spikes above the PTC rated voltage.
5. These devices may be used in both DC and AC circuits provided
that peak-to-peak line voltage when carrying AC does not exceed
the PTC’s Vmax rating. As PTCs are essentially thermal devices,
the RMS value of AC current carried by a PTC will produce
tripping parameters and times-to-trip similar to those of a DC
120 voltage of the same magnitude.
6. If potting is mandated, avoid rigid potting compounds as they will
encase the PTC and prevent it from volumetrically expanding to
properly respond to a trip event.
Specifications subject to change without notice
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302 USA
© 2019 Bel Fuse, Inc.
+1 201.432.0463
Bel.US.CS@belf.com
belfuse.com/circuit-protection
Rev. 0ZRS Sep2019

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Type 0ZRS Series
Environmental Specifications
Temperature cycling
Biased humidity
Operational life
Terminal strength
Resistance to solvents
Mechanical shock
Vibration
Resistance to soldering heat
Thermal shock
Solderability
JESD22 Method JA-104
MIL-STD-202 Method 103
MIL-STD-202 Method 108
AEC-Q200-004
MIL-STD-202 Method 215
MIL-STD-202 Method 213
MIL-STD-202 Method 204
MIL-STD-202 Method 210
MIL-STD-202 Method 107
ANSI/J-STD-002
Soldering Parameters
Lead-free Wave Soldering Profile
Wave Solder Parameter
Average ramp-up rate
Heating rate during preheat
Final preheat temperature
Peak temperature Tp
200° C / second
typical 1 - 2° C / second
Max 4° C / second
within 125° C of soldering
temperature
260° C
Time within +0° C / -5° C of actual peak
temperature
10 seconds
Ramp-down rate
5° C / second max.
4/4
Standard Packaging
P/N Explanation and Ordering Information
Bulk Reel/Tape
Part Number
Pcs/Box P/N Code Pcs/Reel P/N Code
0ZRS0050FF
- 3000 1E 2500 2D
0ZRS0070FF
0ZRS0100FF
-
0ZRS0200FF
3000
1E
1500
2B
0ZRS0300FF 1000
1A
1500
2B
0ZRS0500FF
-
1000
1A
N/A
N/A
0ZRS1000FF
Specifications subject to change without notice
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302 USA
© 2019 Bel Fuse, Inc.
+1 201.432.0463
Bel.US.CS@belf.com
belfuse.com/circuit-protection
Rev. 0ZRS Sep2019