4 A hold, 6 V max — the LoRho PTC for tight spots
The 1206L400SL-SYR: It holds 4 A continuously (Ih) and trips at 8 A (It) within 2 seconds, with a maximum interrupt rating of 50 A at 6 VDC — sized for low-voltage power rails in portable or battery-backed equipment.
Low on-resistance keeps the rail clean
Initial resistance (Ri) is 1 mOhm minimum, and post-trip resistance (R1) rises to 14 mOhm maximum — the LoRho series minimises voltage drop and I²R heating in the hold state, which matters when the load draws close to the 4 A threshold. Approved under cURus and TUV — the part carries agency marks for North American and European equipment safety reviews.
Obsolete — plan your last-time-buy or cross-reference
Littelfuse has marked the 1206L400SL-SYR as Obsolete. No official successor order code is recorded in the lifecycle data.