Emergency protective circuit arrangements for limiting excess current or voltage without disconnection

Introduced: September 1968

Of 6 combined children, 3 exist in both systems.

3 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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H02H 9/001 +2 CPC CPC only CPC only
H02H 9/005 +1 CPC CPC only CPC only
H02H 9/008 CPC only CPC only
H02H 9/02 responsive to excess current +5 CPC IPC+CPC Available in IPC and CPC
H02H 9/04 responsive to excess voltage (lightning arrestors H01C7/12, H01C8/04, H01G9/18, H01T) +7 CPC IPC+CPC Available in IPC and CPC
H02H 9/08 Limitation or suppression of earth fault currents, e.g. Petersen coil since 1980 IPC+CPC Available in IPC and CPC