Siemens SENTRON - Type K Super-Resistant

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This ensures that heating is possible in this case as well. The protective function
of the RCCB continues to remain absolutely independent of the supply voltage as
required by the product standard.
4.4.7 Type
K
super-resistant
Leakage currents and residual currents arising from the operation of electrical
equipment cannot be distinguished. The reaction to both is the same. If a tem-
porary high leakage current occurs, it is neither necessary nor desirable to dis-
connect the load from the supply. If electronic equipment is used with capacitors
connected against the protective conductor in order to eliminate faults, inadver-
tent tripping of the RCCB can occur when the equipment is switched on.
In order to avoid this disconnection, the use of super-resistant residual current
protective devices is recommended. They trip with a time delay and are designa-
ted as Type
K
devices.
As far as the product standards EN 61008-1 (RCCBs) and EN 61009-1 (RCBOs)
are concerned, there are only two types of device:
• Standard
• Selective
S
For these types of device, the limit values for the break times are dened. In
accordance with the standard, the super-resistant residual current protective
devices are instantaneous versions.
Residual current protective devices