UL-approved thermistor supports 30A for circuit protection

March 02, 2017 // By Nick Flaherty
Ametherm has launched a UL-approved circuit protection thermistor that helps to conserve power, save space, and lower costs for a wide variety of applications.

The SL32 0R230 is the only UL-approved circuit protection thermistor on the market with a maximum continuous current rating of 30 A and "hot" resistance of 6 mΩ. This capability minimises voltage drop to a range of 0.18 V to 0.30 V, which helps to maximize battery life and conserve power in applications such as inverters and motor drives.

Designers typically have needed to run two 50 mΩ thermistors in parallel to achieve a comparable level of power efficiency. The SL32 0R230, with 20 mΩ resistance at 50% of maximum current, allows designers to reduce component count while limiting excess circuit board heat from the lower resistance. 

A high UL-approved energy rating of 100 J means the SL32 0R230 is suitable for DC applications where a lower level of inrush current is present but its duration is relatively long.

The maximum capacitance is 6,946 μF at 120 V AC and 1,736 μF at 240 V AC with thermal dissipation constant at 45.4 mW/°C.

The SL32 0R230 has a maximum diameter of 31 mm and height profile of 6 mm and samples and production quantities of the devices are available now, with factory lead times of six weeks.