Ametherm has introduced a new series of inrush current limiting NTC (negative temperature coefficient) thermistors designed to withstand high steady-state currents from 6 A to 50 A and 250 J to 800 J of input energy in a wide range of applications.
Recognised by Underwriters Laboratories (UL) for ensured safety, Ametherm claims the AS Series devices provide lower current density, faster reset times and a wider temperature range without derating compared with traditional inrush current limiters.
The components limit inrush currents for the protection of pre-charge circuits in lithium-ion batteries; variable-frequency drives in sports equipment such as treadmills, high-speed computers, and processors; switch mode power supplies for plasma cutters and welders; and audio amplifiers, MRIs and X-ray machines. While traditional inrush current limiters handle approximately 167 A per square inch for the duration of the inrush current, AS Series devices are designed to withstand 400 A per square inch. This lower current density, in combination with a uniform temperature gradient throughout the disc, increases reliability by eliminating hot spots from fatigue.
The AS Series features Hot R from 0,0074 Ω to 0,380 Ω, resistance at 25°C from 0,50 to 50 Ω, and maximum capacitance at 680 V a.c. from 500 μF to 1730 μF. The devices are available with diameters of 30 mm and 36 mm.
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