Apri/ChiudiCartridge Heaters
High Watt Density
High Watt Density with TC
Medium Watt Density
Low Watt Density
Extra-High Watt Density
Hi-Temp. Super Sealing
Low Voltage
PTC Self-Limiting
Bolt Heaters
Cartridge Heaters for Fluids
Hi-Temp. Super Sealing
Options & Accessories
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Apri/ChiudiMicrotubular Coil Heaters
Standard Sizes
Ordering Forms
Coiling Machine
Special Versions
Hi-Temp. Super Sealing
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Apri/ChiudiNozzle Heaters
Features (Piromax)
Brass Nozzle Heaters
Stainless Steel Nozzle Heaters
Extra-Thin Nozzle Heaters
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Apri/ChiudiBand Heaters
Mica Band Heaters
Ceramic Band Heaters
Rectangular Band Heaters
Cast Alu/Brass Heaters
Protection Housings
Insulating Pads
Contact Accessories
Connection Boxes
Clamping Devices
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Apri/ChiudiFlat Heaters
Mica Flat Heaters
Cast Alu/Brass Heaters
Grooved Heating Plates
Apri/ChiudiFlat Cartridge Heaters
Connection Options
Heating Options
Bending in Shapes
Application and Shapes
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Apri/ChiudiTubular Heaters
Plain Tubular Heaters
Square Cross-Section
Finned Tubular Heaters
Duct Air Heaters
Threaded Immersion Heaters
Flanged Immension Heaters
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Apri/ChiudiCartridge Heaters for Radiators
Constant-power Heaters
PTC Self-Limiting Heaters
Connection Fitting
Control Units
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Apri/ChiudiInfrared Radiant Heaters
Applications & Choice
Technical Data
Thermo-sensitive Colours
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Apri/ChiudiFully-Ceramic Heaters
Technical Data
Apri/ChiudiThermocouples & Resistances
MgO-insulated TC
Conventional TC
Catalogue download
Apri/ChiudiHeating Cable
Self Regulating
Constant Power
Mineral Insulated
Freeze Protection
Apri/ChiudiFlexible Heating Tapes
Etched Foils - General informations
Features - Etched Foils
Apri/ChiudiDrum Heaters for Barrels
Integral Drum Heaters
Flexible Drum Heaters
Apri/ChiudiMoSi2 Heaters
Apri/ChiudiAir Heaters
Apri/ChiudiTemperature Control Units

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PTC elements are electronic components made of a polycrystalline ceramic material with a barium titanate base, suitably doped according to the desired work characteristics.

Its peculiar property is instantly rising its resistance in a logarithmic ratio when temperature rises. This process, practically instantaneous, reaches stability at a certain temperature (Curie point). At such temperature the only energy absorbed is the one needed to keep the PTC element’s temperature constant.

Therefore, a rather high energy absorption will occur initially, that will then decrease depending, after a while, only on the dissipation coefficient. PTC is indeed the acronym of "Positive Temperature Coefficient".

Automax cartridges incorporate PTC elements, thus cannot be classified with a fixed wattage absorption. Their most significant measurable feature is instead the temperature that the heater’s sheath reaches when the cartridge is powered at the specified voltage and placed in open air at ambient temperature.

The input voltage of Automax cartridges can vary within a considerably broad range (12-36 V and 110-240 V) without significant variations in their efficiency.

In Automax cartridges, PTC lend their properties to the whole heater according to a technology exclusively developed by Rotfil’s technicians. This involves irreversibly compressing the electrodes on the entire surface of both input faces. This avoids a decrease of the efficiency due to oxidation, mechanical shocks, vibrations, etc. Insulation between electrodes and external sheath is given by a ceramic tube with high thermic conductivity, also compressed to provide maximum efficiency in heat transfer.

The main advantages of Automax heaters’ performances are therefore:
-Energy saving
-Quick heating

Optimal work range of the PTC element


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