Product Overview

3RT1 contactors/3RH1 control relays
SIRIUS System Manual
GWA 4NEB 430 0999-02 DS 01
3-81
Electronically opti-
mized auxiliary switch
blocks
The electronically optimized auxiliary switch blocks contain enclosed switch-
ing elements that are particularly suitable for switching low voltages and
currents (hard gold-plated contacts) as well as for use in dusty atmospheres.
The rated operational current is I
e
/AC-14 and DC-13: 1 to 300 mA,
voltage: 3 to 60 V.
The electronically optimized auxiliary switch blocks are available as screw-
type or Cage Clamp terminal types:
• Frame size S00 (3RH1911-.NF..): Has two enclosed auxiliary contacts
(1 NO contact + 1 NC contact, 2 NO or 2 NC contacts)
• Frame sizes S0 to S3 (3RH1921-.FE22): Has two enclosed auxiliary con-
tacts and two standard auxiliary contacts, each 1 NO contact + 1 NC con-
tact
The switched current is in acc. with the VDE 0435 regulation for relays.
Auxiliary contacts The following table gives you an overview of all the available auxiliary contacts:
Adding to the auxiliary
contacts
• The basic units of frame size S00 possess an integrated auxiliary contact
and can be supplemented with up to 4 contacts using attachable auxiliary
contacts.
• The basic units of frame sizes S0 to S3 do not have any auxiliary contacts,
but auxiliary switches can be attached at the front or the side.
• Contactors of frame sizes S6 to S12 come with side mounted 2-pole aux-
iliary contact blocks:
- Air-break and vacuum contactors with conventional / electronic coil: 2NO
+ 2NC
- Air-break contactor with remaining lifetime indicator: 1NO + 1NC
They can accept additional side (for air-break and vacuum contactors) or
front mount (only for air-break contactors) auxiliary contact blocks. For max.
number of auxiliary contacts see topic, “Maximum number of auxiliary con-
tacts“.
Auxiliary contacts and attach-
able accessories
Frame size S00 Frame sizes S0 to S12
Integrated auxiliary contact 1 integrated auxiliary
contact
—
4-pole auxiliary switch Attachable at the front Attachable at the front
2-pole auxiliary switch Attachable at the front —
1-pole auxiliary switch — Attachable at the front
1-pole auxiliary switch (infeed
from 1 side)
Attachable at the front —
2-pole auxiliary switch (infeed
from 1 side)
Attachable at the front Attachable at the front
2-pole auxiliary switch — Attachable at the side
Time-delay auxiliary switch
blocks
Attachable at the front Attachable at the front
Electronically optimized auxiliary
switches
Attachable at the front Attachable at the front
Table 3-33: Auxiliary contact blocks