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Ametherm Introduces New Inrush Current Limiting NTC Thermistors Designed to Withstand High Currents From 6 A to 50 A and 250 J to 800 J of Input Energy

CARSON CITY, NV — (Marketwired) — 07/24/13 — Ametherm today introduced a new series of inrush current limiting NTC 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. Recognized by Underwriters Laboratories (UL) for ensured safety, devices provide lower current density, faster reset times, and a wider temperature range without derating compared with traditional inrush current limiters.

The thermistors released today 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. Providing a simple one-component alternative to using power resistors with timers and relays, the AS Series reduces costs and greatly simplifies designs.

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 to 0.380 ohms, resistance at 25 degrees C from .50 to 50 ohms, and maximum capacitance at 680 VAC from 500 to 1730 microfarads. The devices are available with diameters of 30 mm and 36 mm.

Made in the U.S.A. and offered through Mouser, DigiKey, and Farnell, samples of the AS Series are available in three to five days. Production quantities are available with lead times of four weeks.

More information is available at . Samples may be requested via the Ametherm website or by phone: 800-808-2434 (toll free in the U.S.) or +1 775-884-2434 (outside the U.S. and Canada).

Ametherm, headquartered in Carson City, Nev., was founded in 1994 and specializes in inrush current limiting power thermistors for circuit protection in the power market industry. Ametherm-s devices are some of the highest rated in the industry and provide the widest range of output protection available. For more information, visit or call 800-808-2434.

Bob Decker
Redpines
+1 415 409 0233

Lori Morton
Ametherm
+1 775 884 2434