This standard specifies the characteristics of the free plug connector fitted with a grounding spring in the family of circular electrical connectors coupled by bayonet ring. It applies to class defined in Table 3. For contacts, filler plugs and rear accessories associated with this receptacle, see EN 3372-002. For receptacles and protective covers, see EN 3372-003, EN 3372-004, EN 3372-005, EN 3372-007, EN 3372-009 and EN 3372-010 respectively.