| 1/00 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) |
| 1/02 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the magnetic material |
| 1/04 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the material used for insulating the magnetic circuit or parts thereof (insulation of windings H02K 3/3) |
| 1/06 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the shape, form, or construction |
| 1/08 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the shape, form, or construction Salient poles |
| 1/10 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the shape, form, or construction Salient poles Commutating poles |
| 1/12 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the shape, form, or construction Stationary parts of the magnetic circuit |
| 1/14 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the shape, form, or construction Stationary parts of the magnetic circuit Stator cores with salient poles |
| 1/16 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the shape, form, or construction Stationary parts of the magnetic circuit Stator cores with slots for windings |
| 1/17 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the shape, form, or construction Stationary parts of the magnetic circuit Stator cores with permanent magnets |
| 1/18 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the shape, form, or construction Stationary parts of the magnetic circuit Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures |
| 1/20 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the shape, form, or construction Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium |
| 1/22 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the shape, form, or construction Rotating parts of magnetic circuit |
| 1/24 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the shape, form, or construction Rotating parts of magnetic circuit Rotor cores with salient poles |
| 1/26 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the shape, form, or construction Rotating parts of magnetic circuit Rotor cores with slots for windings |
| 1/27 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the shape, form, or construction Rotating parts of magnetic circuit Rotor cores with permanent magnets |
| 1/28 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the shape, form, or construction Rotating parts of magnetic circuit Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures |
| 1/30 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the shape, form, or construction Rotating parts of magnetic circuit Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate part or parts, e.g. spider |
| 1/32 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the shape, form, or construction Rotating parts of magnetic circuit with channels or ducts for flow of cooling medium |
| 1/34 | Details of the magnetic circuit (magnetic circuits or magnets in general, magnetic circuits for transformers for power supply H01F; magnetic circuits for relays H01H 50/16) characterised by the shape, form, or construction Reciprocating, oscillating, or vibrating part of magnetic circuit |