Bel Fuse 0ZTG0110FF2C

A Bel PTC consists of a block of polymeric material containing conductive carbon particles, sandwiched between two conductive metal plates. When this polymer block reaches approximately 165°C — either from current flowing through the conductive carbon particle chains or from an external heat source — it undergoes volumetric expansion. This expansion ruptures most of the carbon particle chains that randomly extend between the two conductive plates. This behavior causes a sharp increase in resistance between the two plates, nearly eliminating current flow through the device, allowing only sufficient residual current to maintain the internal temperature of the block at 165°C. Once current is removed from the "tripped" state, the polymer block cools and contracts back to its original dimensions, allowing the broken carbon chains to reconnect and returning the component to its low-resistance state. After cooling to room temperature, the PTC's resistance will once again fall below its "R1max" rated value. When operating below the device's IHOLD rated current and at temperatures below 125°C, the PTC's resistance remains below its R1 MAX rated value. The catalog data for each device specifies a "typical power" value. This is the power required at 23°C such that the heat dissipated by the device in its tripped state to the surrounding environment exactly matches this value. According to Ohm's Law, power can be expressed as: W = E² / R. Therefore, the approximate resistance of a PTC in its "tripped" state can be determined by: R = E² / W, where "E" is the voltage across the PTC (typically the open-circuit voltage of the power supply) and "W" is the typical power value for the specific PTC. Since the PPTC functions to maintain a constant internal temperature, its apparent resistance will vary depending on the applied voltage and, to a lesser extent, on ambient conditions.

• 1812 chip size, compact surface mount, solid-state, faster trigger time than standard SMD devices
• Fully compliant with EU Directive 2011/65/EU and amending Directive 2015/863
• Compliant with AEC-Q standards
• Compliant with Bel Automotive Qualification (primarily based on internal AEC-Q test program)