Circuit Protection products include Fuses, PTCs, GDTs, Varistors, TVS Diodes, TVS Diode Arrays (SPA®), Switching Thyristors, as well as Reed Switches, Relays and Sensors.

Littelfuse aquired brands include POWR-GARD®, Teccor®, Wickmann®, Pudenz®, Hamlin®, PulseGuard® and SIDACtor®.