Schuko (splash-proof)
Splash-proof Schuko power plugs are a design of Schuko power plugs that are standardized in DIN 49441-2 and 49440-3 and are divided into CEE 7/4 for the plugs and CEE 7/3 for the sockets .
execution
The splash protection ( protection IP44) is realized in that the socket or the coupling socket is supplemented by a collar made of rubber (or rubber-like plastic) and the plug by a small bead.
The position and dimensions of the collar and bead are coordinated in such a way that they slide into one another during the plugging process and achieve the required tightness.
plug
As with the normal Schuko plug, both straight and angled designs are common. Due to the greater insertion depth, the angled connector has a greater distance between the longitudinal axis of the cable and the tips of the plug contacts.
Coupling socket
Thanks to the rubber collar, the insertion depth of the splash-proof coupling socket is greater than that of a normal version (approx. 26 mm instead of approx. 18 mm). The splash-proof coupling socket is usually provided with a loosely attached rubber cap that can be used to close the plug-in opening when unplugged.
socket
Splash-proof sockets for stationary installation are not offered.
Portable multiple sockets (“socket strips”) usually have a firmly connected hinged cover for each socket, which is automatically pressed onto the insertion opening by a spring when it is unplugged and thus closes it.
distribution
Connection cables with splash-proof Schuko plugs are often found in professional and semi-professional power tools. Splash-proof extension cables, cable drums and socket strips are available in retail outlets.
compatibility
(+) Splash-proof Schuko plugs can easily be plugged into normal Schuko sockets and coupling sockets.
(+) Normal straight Schuko plugs can usually be plugged into splash-proof sockets and coupling sockets without any problems.
(-) Normal angled Schuko plugs cannot be inserted deep enough into splash-proof sockets or coupling sockets in some cases; this may not ensure a secure fit and the plug may inadvertently detach from the socket or coupling socket.
(+) Cables with Euro plugs can easily be used with splash-proof sockets and coupling sockets, as the Euro plug is usually straight.
In most cases, plug-in power supplies cannot be safely operated in splash-proof sockets or coupling sockets, because the housings are designed in such a way that the device is as close as possible to the (normal) socket in order to minimize the mechanical load on the socket and device hold. Very small power packs that are completely in the cross-section of the plug-in opening are not affected.
Problems
The incompatibility of splash-proof sockets and coupling sockets with many normal Schuko plugs and devices is annoying and unexpected for many buyers because it is not obvious. This is often mistakenly viewed as a material defect.
With splash-proof sockets, a permanently attached protective cover makes it impossible to plug in certain plug-in power supplies or other plug-in devices.
The fit between the bead of the splash-proof plug and the collar of the splash-proof socket or coupling socket, as well as the elasticity of the collar are critical and must fit exactly in the sense of a uniform plug-in force and the tightness achieved. This is not the case with some products; as a result, the connection is either too loose (and leaking) or too tight.