Active production — 3.5 A hold in a 1206 footprint
The 1206L350SLWR is an active-production polymeric PTC from the POLY-FUSE LoRho series, rated for 3.5 A hold current (Ih) at 6 V max with a 50 A interrupt rating. Its 3 mOhm typical initial resistance keeps I²R losses low in the 3.5 A pass-through state — the post-trip resistance climbs to 18 mOhm max after the polymer switches, limiting fault current to a safe level.
Trip behaviour and thermal budget
At fault current the device trips in 2 seconds typical — fast enough to protect downstream components in a 6 V rail without nuisance opening on inrush. The 1206 concave package (3.25 mm × 1.65 mm, 0.75 mm thick) keeps the board footprint small, but the 3.5 A hold current means the trace width feeding it should be sized for continuous current plus the thermal rise from the PTC's own resistance.
Approvals and compliance
Carries cURus and TUV approvals, covering North American and European equipment safety requirements for a polymeric PTC in a 6 V circuit.