CEE standard system
To ensure that a plug cannot be inserted into a socket with a different voltage or frequency, the positions of the protective contacts relative to the keyway of the socket collar have been assigned to certain voltages and frequencies. A groove in the connector collar and a corresponding lug on the plug prevent hazardous confusion between the systems.
Even if this safety device is damaged, hazardous connection of the protective conductor pin and the phase sleeve is still not possible as the protective conductor pin which has a considerably larger diameter than the phase pin cannot be inserted into the phase sleeve.
You can trust plugs and sockets with this brand name: The Bals CEE plugs and sockets are internationally standardised by IEC 60309-1 and 60309-2 as well as EN 60309 Part 1 and Part 2.
Bals CEE plugs and sockets for amperages of 16A, 32A 63A and 125A have sufficient switching capacity in accordance with DIN VDE 0623 Part 1 §20 and can be actuated under load on consumables up to 500V in accordance with DIN VDE 0100 5.73 §29 b.1, for 63A as high as 690V; corresponding test documents can be provided upon request.
CEE plugs and sockets for amperages of 63A and 125A are equipped with a pilot contact that enables electrical interlocking as per DIN EN 60309 Part 2. This contact closes late when plugging in and opens early when pulling out.