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This socket is rated at 32VAC 15A or 110VDC 15A. It was designed for 32 volt use for farms but this plug has found its way into caravans & motor homes for 12 VDC supply.

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This is used for 230/240 VAC 10A supply

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Not too common but this is designed for 110VAC 10A supply, the welding equipment manufacturer CIG (now BOC) use these for a 77 volt supply for some welder ancillaries on older machines.

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This is used for a 240V 15A supply; the earth pin (the bottom one) is longer to accept the 15 amp plug

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This is used for 230/240 VAC 10A supply for special purposes use i.e. lighting points. Some people also use these for 110 volt supply while others use it for 12 or 24 VDC.

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This beastie is rated for 240V 10A, most probably for clock circuits. Not that common, some 240-110 stepdown transformers were fitted with these as NEMA1-15 plugs fit quite nicely.

These are Clipsal brand sockets, more info from www.clipsal.com

(posted for Darren Carroll)