Product Overview

3RT1 contactors/3RH1 control relays
SIRIUS System Manual
GWA 4NEB 430 0999-02 DS 01
3-85
Switching of the auxil-
iary contact elements
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.
Fig. 3-41: Switching of the auxiliary contact elements
Auxiliary contact ele-
ments with make-
before-break contact-
ing
The following table shows Auxiliary contact elements with make-before-break
contacting:
1) Leading NO contact
2) Lagging NC contact
NC
NO
On
Off
Off
On
Off
On
Contactor
Standard
auxiliary
switch
S00
Auxiliary switch
type
S0 - S12
Auxiliary switch type
3RH1911-.FC22
22U, 2 NO + 2 NC
contacts
Screw-type/Cage
Clamp terminal
3RH1921-.FC22
22U, 2 NO + 2 NC
contacts
Screw-type/Cage
Clamp terminal
3RH1911-.FB11
11U, 1 NO + 1 NC
contact
Screw-type/Cage
Clamp terminal
3RH1911-.FB22
11 / 11 U.
1NO+1NC+1PS
1
)
+1lagging NC
2
)
contact
Screw-type/Cage
Clamp terminal
3RH1921-1CD01
1 NO contact, lead-
ing
Screw-type terminal
3RH1921-1CD10
1 NC contact, lag-
ging
Screw-type terminal
Table 3-39: Auxiliary switches with make-before-break contacting