Inrush current limiting NTC thermistors offer easy installation in industrial and green energy applications

Ametherm has a new series of inrush current limiting NTC thermistors designed to withstand high input energy of 1200J and steady-state currents from 50A to 80A at 680V. Offered in DIN-rail-mountable packages, MM35-DIN series devices are optimised for power distribution in high-power industrial and green energy applications including variable-frequency motor drives, transformers, wind turbines, large inverters, and single- and three-phase motors. The series consists of four thermistors featuring resistance at 25C from 0.2Ohm to 1.5Ohm, maximum power of 38.4W, and thermal time constants of less than 300s. The devices feature diameters of 68mm with thickness of 8.5mm and 9.5mm. The space and cost-saving thermistors provide simple one-component alternatives to using power resistors with relays or MOSFETs, greatly simplifying designs. For easy installation, the devices are developed for use with a DIN block. This allows for mounting within a power control box using only a screwdriver.