2 A hold, 5 mOhm initial — the LoRho advantage on a USB rail
The 1206L200SLYR is a Littelfuse POLY-FUSE LoRho polymeric PTC resettable fuse with a 2 A hold current (Ih) and a 6 V maximum voltage rating, sized for low-voltage DC power rails where every milliohm of series resistance eats into the load margin. Its initial resistance (Ri) is just 5 mOhms minimum, rising to 25 mOhms maximum after a trip event (R1) — the LoRho series is engineered to minimize voltage drop in high-current paths like USB VBUS or battery-charger outputs.
Trip characteristics and overcurrent response
The device trips at 4 A (It) and clears within 500 ms typical under fault, limiting the energy delivered to the protected load before the polymer returns to its low-resistance state.
Approvals and compliance signal
The 1206L200SLYR carries cURus and TUV agency approvals, marking it accepted for North American and European equipment safety certification.