Functions
4.1 Protection functions
3VL IEC molded case circuit breakers
48 System Manual, 11/2013, 110 0110 - 02 DS 03
Single-pole operation with RCD module
Connection of the RCD module for single-pole operation
All 3-pole or 4-pole molded case circuit breakers with RCD module can be operated with 2
poles (L to N), since the power supply of the RCD module is supplied from all three external
conductors, and on 4-pole devices additionally from the N conductor.
Apart from the test current circuit, the RCD module is unrestricted in functionality if at least 2
conductors are connected.
When connecting the RCD module, you only have to ensure that the test current circuit
connected to current path 1-2 and 3-4 (marking) is functioning or is supplied with power.
The following connections are possible in 2-pole operation:
2-pole operation with a 3-pole molded case circuit breaker
● Connection of the network to current path 1-2 and 3-4 (any incoming supply side)
Figure 4-3 3-pole RCD
Note
Single-pole load
Series connectio
n of the current paths is not necessary in the case of single-pole load.
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