Siemens SENTRON - 4-Pole Residual Current Operated Circuit Breakers in a 3-Pole Network; 6 Residual Current Monitoring Devices (RCM)

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Residual current monitoring devices (RCM)
5.7 4-pole residual current operated circuit breakers in a 3-pole network
The 4-pole (3+N) version of the residual current operated circuit breakers can
also be operated in 3-pole systems. In this case, the 3-pole connection must be at
terminals 1, 3, 5 and 2, 4, 6.
The device function is not impaired as a result. Functioning of the test circuit is
only ensured if a jumper is tted between terminals 3 and N (this is also described
in the operating instructions).
6. Residual current monitoring devices (RCM)
In addition to personal protection by means of residual current protection devices
(RCD), permanent residual current monitoring is becoming increasingly important
in terms of increasing system and operational safety and power supply monitoring.
Residual current monitoring devices, also known as residual current monitors
(RCM), monitor residual currents in electrical systems and report when they
exceed a determined value. RCMs are not approved for implementing the “auto-
matic power supply shutoff” protective measure according to the product standard
for residual current monitoring devices EN 62020 (VDE 0663) and/or IEC 62020.
However, an RCM can be used in conjunction with protective devices.
135
N
6
N
24
L1 L2 L3
N
3 x 230 V AC + N
135
N
6
N
24
L1 L2 L3
3 x 400 V AC + N
3 x 230 V AC
3 x 400 V AC
I2_07557
Figure 25: 4-pole RCCB in a 3-pole network