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Intertechnik PTC protection elements

PTC semiconductor element, rated voltage Un 50 V, temperature range -40C to 85C, insulation flame-retardant epoxy resin, The PTC fuse element reacts to overcurrent like a slow-blow fuse, unlike normal fuses, the PTC element resets itself if the circuit is interrupted or the conditions allow a reset.
SE 010 100 MA Range of application PTC elements Speaker size
Power Minimum Average Maximum Tweeter 10 mm 100W SE050 SE065
SE090 Midrange 100-130 mm 50-100W SE065 SE090 SE110 Midrange Hifi
& PA >100W SE010 SE020 SE030 Woofer 25 mm 40-60W SE110 SE135
SE160 Woofer 32-42 mm 60W SE135 SE250 SE375 Ih: Holding current Pd:
power output in switched state R: typical resistance in non-switched state
Is: 1.5 * Ih (20° C) Switching back at
Uo2/4 * RL < Pd Uo: Connection voltage Rl: Value of the load resistance

PTC (Positive Temperature Coefficient) protection elements in crossovers are often referred to as "Resettable Fuses" or "Polymeric Positive Temperature Coefficient Devices (PPTC)". These components are usually used in series with loudspeakers or other electrical loads in audio crossovers.

The main function of the PTC protection elements is to protect the connected speakers from overload or excessive current. When the current through the PTC increases, it heats up. In the event of an overload, the temperature of the PTC reaches a point at which the resistance rises rapidly. As a result, the current flow is limited by the PTC increasing its resistance.

Due to this self-limiting property, PTC protection elements can serve as a kind of automatic protection for the speakers. They provide a temporary increase in resistance to reduce the current supply and protect the speakers from damage due to overheating or overloading. After the cause of the overload has been removed and the PTC cools down, it returns to its original low resistance state and normal operation can continue.

The use of PTC protection elements in crossovers helps to protect speakers and other components from potentially damaging current, improving the reliability and lifespan of the audio system.

The sizing (selection of the correct values) of PTC protection elements depends on the specific requirements of the application, in particular the electrical parameters of the circuit in which they are to be used. Here are some steps you can follow when dimensioning PTC protection elements:

Current limitation: Determine the maximum operating current that the PTC protection elements should limit. This value should be slightly higher than the rated current of the connected load (e.g. speakers) to ensure adequate protection.

Voltage rating: Ensure that the voltage rating of the PTC protection elements is sufficient to cope with the maximum operating voltage in the circuit.

Trip Temperature: Select a PTC with a trip temperature high enough to allow normal operation, but low enough to detect an overload or short circuit. The trigger temperature is the point at which the resistance of the PTC rises sharply.

Resistance value: The resistance of the PTC protection elements in the normal operating state should be low so as not to impair the current flow. The resistance value in the tripped state should be high enough to limit the current.

It is important to note that the exact selection of PTCs depends on the specific requirements and conditions of your application. It may also be helpful to refer to the manufacturer's specifications and data sheets to ensure that the PTC protection elements selected meet the requirements of your application.

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