Siemens SENTRON - General Information; Certification

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The tripping curve of residual current protective devices with a rated residual cur-
rent of I
Δn
≤ 10 mA is in zone 2 below the release limit. Medically damaging effects
and muscle cramps do not usually occur (see gure 2). They are therefore suitable
for sensitive areas, such as bathrooms.
Residual current protective devices with a rated residual current of I
Δn
≤ 30 mA
fulll the conditions for additional protection against electric shock (see gure 2):
• in the event of unintentional, direct contact with parts that are live when
operational (e.g. failure of the basic insulation, operation for other than the
intended purpose, ineffective basic protection)
• in the event of carelessness on the part of the user (e.g. use of defective
equipment, incorrectly repaired components and equipment)
• in the event of contact with defective live parts (e.g. loss of protection
against faults due to interruption of the protective conductor)
The use of residual current protective devices with a rated residual current of up
to 30 mA has proven to be effective as additional protection in the event of failure
of the basic protection precautions (protection against direct contact) and/or fault
protection precautions (protection against indirect contact) as well as in the event
of carelessness on the part of the user when using electrical equipment. However,
this should not be the only way of providing protection against electric shock.
This does not replace the need for further protective measures as required by
DIN VDE 0100-410.
The requirement for „additional protection“ with residual current protective
devices according to sections 411.3.3 and 415.1 of DIN VDE 0100-410 does not
mean that how this protection is used is up to the user. This additional protec-
tion can be required in conjunction with other protection measures under certain
external inuences and in certain special areas.
In several parts of the standards of sections 4 and 7 of DIN VDE 0100, this additio-
nal protection is required or expressly recommended (see appendix). Some im-
portant requirements are explained below in more detail as examples.