Figure 3-33: Switching Of The Auxiliary Contact Elements; Table 3-26: Possible Auxiliary Switch Combinations With 4-Pole/Capacitor-Switching Contactors; Table 3-27: Auxiliary Switches With Make-Before-Break Contacting - Siemens sirius System Manual

3RT1/3RH1 contactors
Switching of the auxil-
iary contact elements
Auxiliary contact ele-
ments with make-
before-break contact-
ing
3-56
Contactors with 4 main contacts and capacitor-switching contactors
Contactors with 4 auxiliary con-
4 main contacts
Capacitor-swit-
ching contactors

Table 3-26: Possible auxiliary switch combinations with 4-pole/capacitor-switching contactors

With the standard type of auxiliary switch, when the contactors are
switched on, first the NC contacts are opened and then the NO contacts are
closed.
Contactor
N
Standard
auxiliary
switch
S

Figure 3-33: Switching of the auxiliary contact elements

S00
Auxiliary switch
type
3RH1911-1FC22 22U, 2 NO + 2 NC
contacts
Screw-type terminal
3RH1911-1FB11 11U, 1 NO + 1 NC
contact
Screw-type terminal
3RH1911-1FB22 11/11U.
1 NO+1 NC+1PS
+1lagging NC
contact
Screw-type terminal
3RH1911-2FC22 22U, 2 NO + NC
contact
Cage Clamp
3RH1911-2FB11 11U, 1 NO + 1 NC
contact
Cage Clamp

Table 3-27: Auxiliary switches with make-before-break contacting

1) Leading NO contact
S00 S0
Maximum of 2 auxiliary
tacts contacts
(attached at the side or
snapped on at the top)
An additional 2-pole auxiliary switch block on each side
(3RH1921-1EA..: 2 NO, 2 NC or 1 NO + 1 NC contact)
On
Off
S0 - S3
3RH1921-1FC22
1
)
3RH1921-1CD10
3RH1921-1CD01
3RH1921-2FC22
S2/S3
Maximum 4 auxiliary
contacts (attached at the
side or snapped on at the
top)
Off
Auxiliary switch type
22U, 2 NO + 2 NC
contacts
Screw-type terminal
1 NO contact, lead-
ing
Screw-type terminal
1 NC contact, lagging
Screw-type terminal
22 U, 2 NO + 2 NC
Cage Clamp
SIRIUS System Manual
GWA 4NEB 430 0999-02b
On
Off
On