Temperature Sensors / Detectors / Transducers
NTC Thermistors withstand steady-state currents from 6-50 A.
Press Release Summary:
Able to withstand 250–800 J of input energy, AS Series limits inrush currents for protection of pre-charge circuits in Li-ion batteries, variable-frequency drives, switch mode power supplies, and audio amplifiers. Uniform temperature gradient throughout disc combined with ability to withstand 400 A per in.² eliminates hot spots from fatigue. Ranging 30–36 mm dia,  AS Series features Hot R from 0.0074–0.380 Ω, resistance of .50–50 Ω at 25°C, and max capacitance of 500–1,730 µF at 680 Vac.
Original Press Release:
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, Nev. —Â 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, AS Series 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 0.0074Â Ω to 0.380 Ω, resistance at 25 °C from .50Â Ω to 50 Ω, and maximum capacitance at 680 VAC from 500 µF to 1730 µF. 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. Pricing for U.S. delivery starts at $2.50 per piece.
Link to downloadable product information:
http://www.ametherm.com/latest/as-series-inrush-current-limiter-new-product-announcement
More information is available at www.ametherm.com. 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).
About Ametherm
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 www.ametherm.com or call 800-808-2434.
