PTC Heaters
Positive temperature co-efficient - PTC heating elements are
small ceramic stones with self temperature limiting characteristics.
PTC stones have fast heating response times and plateau once the
pre-defined reference temperature is reached. The shape of these
stones can be be designed to be square, rectangular, round, ring
or doughnut style. Above the reference temperature, the semiconducting
and ferro-electrical properties of the ceramic are utilized to
produce a rise in resistance of several orders of magnitude, and
hence produce it's self limiting properties.
This resistance rise can be experienced over a temperature range
of a few degrees Celsius. This PTC attribute results in a heating
element that self-regulates at a pre-set temperature and automatically
varies its wattage in order to maintain that pre-set temperature.
Hence, a greater degree of thermal dissipation (cooling) will
result in higher power.
The materials used are doped polycrystalline ceramics based on
barium titanate. Once the ceramic body has been formed through
processes including blending, milling, drying and sintering, metallized
contacts are applied to the surface to facilitate electrical connection.
PTC Features & Benefits
- Safe through temperature limiting characteristics
- Dynamic, self regulating, and therefore energy efficient
- All voltages from 12 V to 240 V; special voltage applications
up to 800 V
- Dual voltages 12-24 V, 100-240 V
- PTC surface temperatures can be set from 40° C / 104°
F to 280° C / 536° F
- Temperature tolerances +/- 5° C
- Compact design
- High power densitity
- Long lifetime
- Reliable
- UL, CSA and VDE recognised
- Custom configurations available in regards to size, inrush
current, temperature, voltage, and power output
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