The Tesla 1111445-00-F pyrotechnic disconnect fuse is the factory high-voltage battery safety link used on many 100 kWh Model S and Model X packs. Rated at approximately 2,366 A, this self-powered hybrid pyrofuse uses a small explosive charge to mechanically open the main HV path in milliseconds during a severe crash or isolation fault, protecting occupants, first responders, and downstream power electronics.
| Parameter | Detail |
|---|---|
| Tesla Part Number | 1111445-00-F (DISCONNECT, PYROTECHNIC, CUR POWERED, 2366A) |
| Function | Pyrotechnic high-voltage battery main disconnect / hybrid fuse |
| Current Rating | ~2,366 A continuous (HV Battery 2.0 — 100 kWh) |
| Energy Type | Self-powered hybrid pyrofuse (no separate battery feed required) |
| Activation | Pyrotechnic charge commands a mechanical break in the HV bus during a crash or isolation event |
| Reset / Reuse | Single use; replace after any deployment, corrosion, or service-manual-directed inspection |
| Platform | Typical Years | Battery / Notes |
|---|---|---|
| Tesla Model S | 2012–2021 | Used in many 100 kWh “HV Battery 2.0” packs. Verify via Tesla EPC, pack label, or existing pyrofuse before ordering. |
| Tesla Model X | 2015–2021 | Also fitted to compatible 100 kWh Model X packs. Vehicles with other pack sizes may use 1111313-00-F or earlier pyrofuse designs. |
| Fitment Reminder | Tesla uses multiple pyrofuse part numbers across S/X generations. Confirm your VIN, pack energy (100 kWh vs non-100 kWh), and the original fuse PN stamped on the part or specified in the Tesla Service Manual. | |
Unlike a conventional fuse that melts slowly under sustained overload, a pyrofuse contains a tiny pyrotechnic charge. When the car’s safety system detects a severe crash, that charge is fired, driving a piston or blade through the conductor and mechanically severing the high-voltage path in a few milliseconds. Because it uses this explosive, “pyro” action to open the circuit, the device is known as a pyrotechnic fuse—or simply a pyrofuse.
