SIEMENS
SIEMENS 3RH29111LA11 Auxiliary Contact Block 1NO/1NC 690V AC
Auxiliary contact block adds one normally-open and one normally-closed circuit to SIRIUS contactors, rated 690 V AC with screw terminals and IP20 protection
- Front-mount auxiliary block adds 1NO/1NC contacts
- Screw terminals give secure 690V AC connections
- IP20 rating protects against finger contact
- Fits SIRIUS 3RH2 and 3RT2 contactors
- Compact design suits frame sizes S00 to S3
Auxiliary Contact Block 1NO/1NC
The SIEMENS 3RH29111LA11 adds one normally open and one normally closed contact to compatible SIRIUS contactor relays and contactors. It is designed for front mounting on frame sizes S00, S0, S2 and S3 as well as NEMA sizes 0 and 00.
Thermals noise and power draw
The block carries an IP20 rating and a maximum voltage rating of 690V AC for the auxiliary circuit. It operates passively within the host contactor and adds no active cooling requirement or measurable acoustic output in normal use.
Build fit and wiring
Two screw terminals accept the control wiring for each contact position. The unit mounts directly onto the front of the listed SIRIUS 3RH2 and 3RT2 devices, freeing DIN-rail space that a separate relay would otherwise occupy.
Highlights
- Front-mount auxiliary block adds 1NO/1NC contacts
- Screw terminals give secure 690V AC connections
- IP20 rating protects against finger contact
- Fits SIRIUS 3RH2 and 3RT2 contactors
- Compact design suits frame sizes S00 to S3
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
How do I fit the 3RH29111LA11 block onto a SIRIUS 3RT2 contactor and which step is often missed?
Snap the block onto the front of the contactor, then tighten both screw terminals; the step most installers miss is verifying the latch clicks fully home before wiring.
What maintenance will the 3RH29111LA11 need during its service life?
Periodically check the screw terminals for tightness and inspect the IP20 housing for dust or discolouration; replace the block if contacts show erosion or overheating marks.
What limit appears first when the 3RH29111LA11 runs continuously at its 690V AC rating?
Contact temperature rise reaches the design limit first, so sustained load must stay within the rated current to avoid premature contact wear.
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