Polymeric PTC in a 1206 footprint
The 1206L175SLYR is a polymeric positive temperature coefficient (PTC) resettable fuse from the POLY-FUSE LoRho series, designed for overcurrent protection in low-voltage circuits. It holds 1.75 A continuously and trips at 3.5 A, with a maximum interrupt rating of 50 A at 6 VDC. The 1206 (3216 Metric) concave package suits surface-mount assembly on standard PCB footprints, with a low profile of 0.071" (1.80 mm) maximum thickness.
Trip time and resistance profile
Time to trip is 400 ms at the rated fault current — fast enough to protect downstream components from sustained overcurrent without nuisance tripping on short transients. Initial resistance (Ri) is a minimum of 5 mOhms, keeping I²R losses low during normal operation. After a trip event, the post-trip resistance (R1) rises to a maximum of 30 mOhms, which resets once the fault is cleared and power is cycled.
Approvals include cURus and TUV, confirming compliance with North American and international safety standards for overcurrent protective devices.