Inrush current-limiting NTC thermistors target alternative energy applications

Designed to withstand high input energy from 500 J to 900 J and steady-state currents from 10A to 50A, a new series of inrush current-limiting NTC thermistors has been introduced by Ametherm. Offering a rugged design, the MS35 series devices are optimized for high-power applications, including solar inverters, battery chargers, and DC-DC converters. The MS35 series consists of seven thermistors featuring resistance from 0.5ohm to 20ohm, dissipation constants from 78mw/C to 102.45mw/C, and thermal time constants from 65s to 240s. The devices can handle body temperatures up to 235C at 100% of their maximum current rating, and they offer maximum capacitance from 1000µF to 1800µF at 680VAC. Featuring diameters of 37mm and 38mm and profiles down to 6.5mm, the thermistors handle the same amount of energy as power resistors in a smaller package, saving valuable circuit board space. In addition, they provide simple one-component alternatives to using power resistors with timers and relays, reducing costs and greatly simplifying design, says the company.