Siemens SENTRON - Dimensions of the Cover Frame for Door Cut-out

30
Rated residual current
Maximum permissible grounding resistance
at touch voltage
50 V 25 V
30 mA 120 Ω 60 Ω
300 mA 60 Ω * 8 Ω *
500 mA 10 Ω 5 Ω
* The value may be up to 120 Ω at 50 V and 60 Ω at 25 V for Type B+
4.4.4 SIQUENCE universal current-sensitive RCBO
Type B and Type B+
The principle of detection on which the SIQUENCE Type B universal current-
sensitive RCBO is based is identical to that on which the SIQUENCE universal
current-sensitive RCCB is based and operates in accordance with VDE 0664-200
(applicable standard in Germany) and DIN V VDE V 0664-210 (Type B+) indepen-
dently of the supply voltage with regard to the requirements for Type A.
With regard to the response to residual currents and the protective functions, the
same statements and specications which apply to the SIQUENCE Type B / Type
B+ universal current-sensitive RCCB are applicable. RCBOs combine in one unit the
protection functions of electricshock and re protection along with line protection.
Thanks to the integrated overcurrent protection feature, intrinsic thermal protecti-
on of the device is ensured automatically without further adaptation to upstream/
downstream overload protection systems.
In addition to those advantages mentioned in section 4.4.2, direct allocation of a
SIQUENCE Type B universal current-sensitive RCBO to a circuit offers the following
special advantages over an RCCB and multiple miniature circuit breakers in the
outgoing circuit:
• the maximum possible leakage current (0.3 * I
Δn
) can be used in each feeder.
• As in the case of overcurrent, tripping due to residual current disconnects only
the affected branch from the supply voltage
• High system availability, since the fault-free part of the system is still supplied
with power.
Table 3: Recommended maximum grounding resistances for SIQUENCE universal
current-sensitive Type B and Type B+ RCCBs
Residual current protective devices