Details of transformers or inductances, in general

Introduced: September 1968

Of 14 combined children, 10 exist in both systems.

4 codes are CPC-only extensions.

3 shared codes have differing titles between IPC and CPC.

Child Classifications

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H01F 27/002 CPC only CPC only
H01F 27/004 CPC only CPC only
H01F 27/006 CPC only CPC only
H01F 27/008 CPC only CPC only
H01F 27/02 Casings +3 CPC IPC+CPC Available in IPC and CPC
H01F 27/06 Mounting, supporting or suspending transformers, reactors or choke coils +1 CPC IPC+CPC Available in IPC and CPC
H01F 27/08 Cooling (heat-transfer elements F28F); Ventilating (structural details of casings H01F27/02) +1 CPC IPC+CPC Available in IPC and CPC
H01F 27/23 Corrosion protection since 1995 IPC+CPC Available in IPC and CPC
H01F 27/24 Magnetic cores IPC+CPC Available in IPC and CPC
H01F 27/28 Coils; Windings; Conductive connections +8 CPC IPC+CPC Available in IPC and CPC
H01F 27/33 Arrangements for noise damping IPC+CPC Available in IPC and CPC
H01F 27/34 Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields +4 CPC IPC+CPC Available in IPC and CPC
H01F 27/40 Structural association with built-in electric component, e.g. fuse +2 CPC IPC+CPC Available in IPC and CPC
H01F 27/42 Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils (circuits for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output H02P13/00; impedance networks H03H) +1 CPC IPC+CPC Available in IPC and CPC