The Littelfuse Polyswitch is a resettable device that performs like a fuse under overcurrent conditions, but is unique in that it will reset. As soon as an overcurrent condition is reached the Polyswitch heats up to its trip temperature. * Trip current 0.8A * Trip time 3.8 sec * Hold current 0.4A * Max voltage 72V * Max current 40A * Radial leaded package * Initial resistance 0.55 to 0.86R * Post-trip resistance 1.29R * Lead pitch 5.1mm * Dimensions 7.6mm x 7.6mm x 13.5mm * UL and TUV approved Note: Previously manufactured by Raychem. https://elecena.pl/product/27216270/littlefuse-rxef040-0-4a-polyswitch-fuse 2024-11-10 https://elecena.pl/product/27216270/littlefuse-rxef040-0-4a-polyswitch-fuse 2025-03-22 https://elecena.pl/product/27216270/littlefuse-rxef040-0-4a-polyswitch-fuse 2025-05-21 https://elecena.pl/product/27216270/littlefuse-rxef040-0-4a-polyswitch-fuse 2025-06-27 https://elecena.pl/product/27216270/littlefuse-rxef040-0-4a-polyswitch-fuse 2025-09-16 https://elecena.pl/product/27216270/littlefuse-rxef040-0-4a-polyswitch-fuse 2026-04-08