Lab – PTC Protection Module

High-amp, high-performance PTC protection module, used with the Lab in Springless-Fused mode. This PTC fuse is assembled in the bottom cap of the Lab to protect your batteries and the mod itself from damage caused due to short-circuits.

During a short circuit, the PTC module interrupts the high-current and slowly warms up. This heat is transferred directly to the bottom cap of the Lab and signals that the device has been short-circuited. As soon as the fault is removed, the device cools down fast and reverts back to its low-resistance state.

PTC fuses do not ‘burn’ like the traditional ones. In contrast, they have an internal resistance which is dependent on current and temperature: An abnormally high current or temperature will quickly bring a PTC fuse to a high-resistance state, which effectively brings the current down to very low levels.

This PTC module is rated for operation up to 7 A at 40 degrees Celsius and has been designed to trip in about a couple hundred milliseconds when hard-shorting a low-resistance mod powered by a high quality IMR battery. The device will also trip within a few seconds when conducting currents above 8 A.

?he performance impact when using the fuse in Springless-Fused mode is minimal: Ballpark voltage-drop values are 0.06-0.08V drop at 1.0 Ohm (~4A), and 0.12-0.17V drop at 0.5 Ohm (~7A), both at an ambient temp of 40*C.

Note that after many tripping cycles, the performance of the fuse may slowly start to deteriorate.