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MegaSurge NTC thermistors receive UL certification

Posted: 19 Aug 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Ametherm? thermistors? power supplies? resistance?

Ametherm's MegaSurge series of inrush current limiting NTC thermistors recently achieved Underwriters Laboratories (UL) certification. In addition to recognition per UL file number E209153, the devices are the industry's only inrush current limiters certified to UL 1434 for single- and three-phase input voltages up to 480VAC.

The MegaSurge thermistors limit inrush currents for the protection of circuits in power supplies, motor controllers, audio amplifiers, battery chargers, frequency generators, plasma cutting tools, MRI machines, and toroidal transformers. Providing a simple one-component alternative to using wirewound resistors with timers and relays, MegaSurge series devices reduce costs and greatly simplify designs. In addition, they increase safety by eliminating the fire hazard associated with failed relays.

While traditional thermistors are only certified for input voltages from 85VAC to 265VAC, UL-recognised MegaSurge devices not only offer 480VAC ratings, but have the ability to withstand high steady-state currents to 36A and up to 300J of input energy. These specifications are the highest of any single-solution inrush current limiting device on the market.

Made in the USA, the UL-recognised MegaSurge devices feature resistance at 25∼C from 1.0次 to 220次, resistance at 100 per cent of steady-state current from 0.007次 to 1.50次, and tolerance of 25 per cent. The thermistors provide maximum capacitance to 1300?F at 480VAC.

Offered through Mouser, DigiKey, and Farnell, samples and production quantities of the MegaSurge series are available in three to five days. Production quantities are available with lead times of four weeks.





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