Axial Lead Battery Strap PTC 0ZSA Series 0ZSA Series RoHS 2 Compliant Application Rechargeable battery packs, Lithium cell and battery packs Product Features Low profile, Solid state Operating (Hold Current) Range 1.2A - 4.2A Maximum Voltage 15V - 30V DC Temperature Range -40 to 85 Agency Approval TUV (Std. EN62319-1-1, Cert. R50102187) UL Recognized Component (Std. UL1434, File E305051) UL Conditions of Acceptability: 1. These devices have been investigated for use in safety circuits and are suitable as a limiting device. 2. These devices have been calibrated to limit the current to 8 amps within 5 seconds, per ANSI/NFPA 70, "National Electrical Code". LEAD FREE = HALOGEN FREE = Electrical Characteristics (23) Hold Current Trip Current Max Time to Trip @ 5xIH IH, A IT, A Seconds A 0ZSA0120FF1E 1.20 2.70 5.0 15 B 0ZSA0175FF1E 1.75 3.80 5.0 C 0ZSA0200FF1E 2.00 4.40 D 0ZSA0350FF1E 3.50 E 0ZSA0420FF1E 4.20 Part Number (Bulk) Rated Voltage Max Typical Current Power Resistance Tolerance Agency Approvals Rmin Rmax R1max Pd, W Ohms Ohms Ohms 100 1.2 0.085 0.160 0.220 Y Y 15 100 1.5 0.050 0.090 0.120 Y Y 4.0 30 100 1.9 0.030 0.060 0.100 Y Y 6.30 3.0 30 100 2.5 0.017 0.031 0.050 Y Y 7.60 6.0 30 100 2.9 0.012 0.024 0.040 Y Y Vmax, Vdc Imax, A IH Hold Current-maximum current at which the device will not trip in still air at 23. IT Imax Vmax Pd Trip current-minimum current at which the device will always trip in still air at 23. Maximum fault current device can withstand without damage at rated voltage (Vmax). Maximum voltage device can withstand without damage at its rated current. Typical power dissipated by device when in tripped state in 23 still air environment. Rmin Rmax Minimum device resistance at 23. Maximum device resistance at 23. R1max Maximum device resistance at 23, 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 Type 0ZSA Series 2/4 PTC's - Basic Theory of Operation / "Tripped" Resistance Explanation Fundamentally, a Bel PTC consists of a block of polymeric material containing conductive filler and bonded between two conductive, planar terminations. At currents below the device IHOLD rating, AND at temperatures below 100C, the PTC maintains a resistance value below its R1 MAX rating. As the device's temperature approaches 130C, either due to an increase in ambient temperature or a current exceeding its I TRIP rating, volumetric expansion of the filled polymer breaks apart the majority of conductive pathways across the terminals created by chain contact of adjacent filler particles or device resistance increases sharply by several orders of magnitude. At the much higher "Tripped" resistance, there is just enough leakage current to allow internal heating to "hold" the device in its tripped state (around 125C) until power is interrupted. Once power is removed, the PTC's core cools and contracts allowing conductive chains to reform and return the device to its low resistance state. 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 = E^2/R. Thus the approximate resistance of a "Tripped" PTC can be determined by: R = E^2/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 = 60^2/1 = 3,600 ohms This same tripped device when used to protect a 12V circuit would now present an apparent resistance of: R = 12^2/1 = 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. Type Time - To - Trip at 23 . Specifications subject to change without notice Bel Fuse Inc. 206 Van Vorst Street Jersey City, NJ 07302 USA +1 201.432.0463 Bel.US.CS@belf.com belfuse.com/circuit-protection (c) 2019 Bel Fuse, Inc. Rev. 0ZSA Jan2019 Type 0ZSA Series 3/4 Physical Specifications Lead material: 0.13mm nominal thickness, quarter-hard nickel. Insulating material: Polyester tape PTC Marking "bel" or "b", IH code and "SA" . Product Dimensions All dimensions in mm. A B C D F Part Number Thermal Derating Curve Min Max Min Max Min Max Min Max Min Max 0ZSA0120FF 19.9 22.1 4.9 5.2 0.6 1.0 5.5 7.5 3.9 4.1 0ZSA0175FF 20.9 23.1 4.9 5.2 0.6 1.0 4.1 5.5 3.9 4.1 0ZSA0200FF 21.3 23.4 10.2 11.0 0.5 1.1 5.0 7.6 4.8 5.4 0ZSA0350FF 28.4 31.8 13.0 13.5 0.5 1.1 6.3 8.9 5.9 6.1 0ZSA0420FF 30.6 32.4 12.9 13.6 0.5 1.1 5.0 7.5 5.9 6.1 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 are intended for use in DC voltage applications only. Use in AC voltage applications should be first discussed with Bel Fuse engineering. 6. Not recommended for use on potted or conformal coated PCB's. Restriction of free air flow could affect electrical performance and/or result in device failure. Consult Bel Fuse engineering. Specifications subject to change without notice Bel Fuse Inc. 206 Van Vorst Street Jersey City, NJ 07302 USA +1 201.432.0463 Bel.US.CS@belf.com belfuse.com/circuit-protection (c) 2019 Bel Fuse, Inc. Rev. 0ZSA Jan2019 Type 0ZSA Series 4/4 P/N Explanation and Ordering Information Standard Packaging Packaging Option Packaging Quantity Packaging Code Bulk 3000 1E Specifications subject to change without notice Bel Fuse Inc. 206 Van Vorst Street Jersey City, NJ 07302 USA +1 201.432.0463 Bel.US.CS@belf.com belfuse.com/circuit-protection (c) 2019 Bel Fuse, Inc. Rev. 0ZSA Jan2019