Siemens SENTRON 3VL series, System Manual

Page: 56 / 360

Functions
5.1 Current protection
3VL molded-case circuit breakers
56
System Manual, 03/2009, 110 0110 - 02 DS 01
5.1.7 Single-pole operation with RCD module
Connection of the RCD module for single-pole operation
In principle, all 3-pole or 4-pole 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:
On 3-pole circuit breakers
●
Connection of the network to current path 1-2 and 3-4 (any incoming supply side)
5&'
/ / /
/ 1
/DVW
Figure 5-2 3-pole RCD
On 4-pole circuit breakers