PPTC resettable fuses are designed and produced with a patented Polymeric PTC (PPTC) material in thin chip form. It is placed in series in a circuit to offer over current protection. At normal operating condition the device remains at an extremely low resistance and allows the electrical current to flow through it without any restriction. When overcurrent conditions occur, the Polymeric PTC material heats up and its resistance increase sharply. Such a sharp resistance increase cuts off the current in the circuit. Upon fault current being removed, the resettable fuse cools and its resistance drops to the original extremely low value. The resettable fuse is reset and allows the current through the circuit again.

PPTC products are produced in the following package styles: Radial leaded, round and rectangular body Strap type for rechargeable battery packs SMD chip type for surface mount designs.

Radial leaded FRX 0.1~3.75A, 60, 72, 90V FRU 0.9~9A, 30V FSUB 0.75~2.5A, 30V FRG, 3~14A, 16V FBR 0.1~0.9A, 90V FRH 0.08~0.18A, 60, 250, 600V, Telecom FRA 0.1~3.75A, 120Vac and dc

Strap type FSR 1.2~4.2A, 15 & 30V for rechargeable battery FLT 0.7~3.4A, 24V for rechargeable battery FLR 1.9~7.3A, 15 & 20V, rechargeable battery

SMD surface mount FSMD1206 0,05~1.5A, 6 & 60V FSMD1210 0.05~1.5A, 6 & 60V FSMD1812 0.14~1.6A, 6 & 60V FSMD2920 0.3~3A, 6 & 60V