{
  "type": "fuse",
  "specs": [
    {"name": "current_rating_a", "description": "Rated current", "unit": "A", "required": true},
    {"name": "voltage_rating_v", "description": "Maximum rated voltage", "unit": "V"},
    {"name": "breaking_capacity_a", "description": "Maximum breaking/interrupting capacity", "unit": "A"}
  ],
  "subtypes": {
    "fuse": {
      "description": "Fuse (generic)"
    },
    "fuse.standard": {
      "description": "Standard fuse (one-time blow)"
    },
    "fuse.ptc_resettable": {
      "description": "PTC resettable fuse (polyfuse)",
      "extra_specs": [
        {"name": "hold_current_a", "description": "Maximum current without tripping (Ihold)", "unit": "A"},
        {"name": "trip_current_a", "description": "Minimum current that triggers trip (Itrip)", "unit": "A"},
        {"name": "resistance_ohm", "description": "Typical resistance at 25C (Rtyp)", "unit": "ohm"}
      ]
    }
  }
}