page_title: Industrial and multiphase power plugs and sockets
section_title: Switzerland: SEV 1011
hierarchical_section_title: Industrial and multiphase power plugs and sockets / Europe / Switzerland: SEV 1011
caption_attribution_description: English: Electrical plugs and sockets, SEV 1011, Swiss system
context_page_description: Industrial and multiphase plugs and sockets provide a connection to the electrical mains rated at higher voltages and currents than household plugs and sockets. They are generally used in polyphase systems, with high currents, or when protection from environmental hazards is required. Industrial outlets may have weatherproof covers, waterproofing sleeves, or may be interlocked with a switch to prevent accidental disconnection of an energized plug. Some types of connectors are approved for hazardous areas such as coal mines or petrochemical plants, where flammable gas may be present.
  Almost all three-phase power plugs have an earth connection, but may not have a neutral because three-phase loads such as motors do not need the neutral. Such plugs have only four prongs. An example of a socket with neutral is the L21-30 and the L21-20 both of which have five pins.
  While some forms of power plugs and sockets are set by international standards, countries may have their own different standards and regulations. For example, the colour-coding of wires may not be the same as for small mains plugs.
context_section_description: The Swiss standard SN SEV 1011:2009 Plugs and socket-outlets for household and similar purposes. defines a hierarchical system of plugs and sockets including both single and three phase connectors. Sockets will accept plugs with the same or fewer number of pins and the same or lower ratings. Single phase Swiss plugs and sockets are described in AC power plugs and sockets
  The type 15 plug and socket has 3 round pins of 4 mm diameter, plus 2 flat pins (for L2 and L3). It is designed for three phase applications and is rated at 10 A, 250 V/400 V. The socket will also accept types 11 and 12 plugs, and the Europlug.
  The type 25 plug and socket has 3 rectangular pins, 4 mm x 5 mm, plus 2 flat pins (for L2 and L3). It is designed for three phase applications and is rated at 16 A, 250 V/400 V. The socket will accept types 11, 12, 21, and 23 single phase plugs, the Europlug, and types 15 and 23 three phase plugs.
caption: SEV 1011:2009, overview of the hierarchical Swiss System for household and similar purposes
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