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 8A * Trip time 12.7 sec * Hold current 4A * Max voltage 30V * Max current 40A * Radial leaded package * Initial resistance 0.01 to 0.03R * Post-trip resistance 0.05R * Lead pitch 5.8mm * Dimensions 14mm x 7.6mm x 20.1mm * UL and TUV approved Note: Previously manufactured by Raychem. https://elecena.pl/product/27216277/littlefuse-ruef400-4-0a-polyswitch-fuse 2024-11-10 https://elecena.pl/product/27216277/littlefuse-ruef400-4-0a-polyswitch-fuse 2025-03-22 https://elecena.pl/product/27216277/littlefuse-ruef400-4-0a-polyswitch-fuse 2025-05-21 https://elecena.pl/product/27216277/littlefuse-ruef400-4-0a-polyswitch-fuse 2025-06-08 https://elecena.pl/product/27216277/littlefuse-ruef400-4-0a-polyswitch-fuse 2025-07-17 https://elecena.pl/product/27216277/littlefuse-ruef400-4-0a-polyswitch-fuse 2025-08-27 https://elecena.pl/product/27216277/littlefuse-ruef400-4-0a-polyswitch-fuse 2026-04-08