Bel Fuse Surface Mount PTC

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 125°C, 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 125°C. 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 100°C, 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 23°C. 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 1watt protecting a circuit using a 60V supply will demonstrate an apparent, tripped resistance "R" of: R = 60²/1 = 3,600ohms. This same tripped device when used to protect a 12V circuit would now present an apparent resistance of: R = 12²/1 = 144ohms.

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.

Features

• 2920 chip size, fast trip time, high hold currents
• Full compliance with EU directive 2011/65/EU and amending directive 2015/863