SIEMENS
SIEMENS 3RH29111FA22 Auxiliary Contact Block 2NO 2NC 690V AC
Adds two normally open and two normally closed contacts to compatible SIRIUS contactors, rated at 690 V AC with screw terminals and IP20 protection
- Front-mount auxiliary block adds 2 NO and 2 NC contacts
- Screw-terminal wiring for secure 690 V AC control circuits
- IP20 finger-safe housing protects operators during maintenance
- Fits SIRIUS 3RH2 relays and 3RT2 contactors frame S0 to S3
- Four auxiliary circuits in one compact block simplifies panel design
Auxiliary Contact Block 2NO 2NC
The Siemens 3RH29111FA22 adds four auxiliary contacts to compatible contactor relays and contactors. It provides two normally open and two normally closed circuits rated for 690V AC. Front mounting and screw terminals simplify installation in control panels. The block carries an IP20 rating for finger-safe protection.
Upgrades from blocks with fewer contacts
Replacing a two-contact auxiliary block with this four-contact version doubles the available signalling paths without changing the mounting footprint. The jump is worth it when additional interlocking or status feedback is required on the same device. Compatibility spans SIRIUS 3RH2 contactor relays and 3RT2 contactors across frame sizes S00, S0, S2 and S3.
Suits panel builders expanding control logic
Engineers adding auxiliary functions to existing SIRIUS starters will find the screw terminals and front-mount design familiar and quick to wire. Buyers who need spring-loaded terminals or a different contact arrangement should look at other variants in the range. The block is not suited for applications requiring voltages above 690V AC or higher IP ratings.
Highlights
- Front-mount auxiliary block adds 2 NO and 2 NC contacts
- Screw-terminal wiring for secure 690 V AC control circuits
- IP20 finger-safe housing protects operators during maintenance
- Fits SIRIUS 3RH2 relays and 3RT2 contactors frame S0 to S3
- Four auxiliary circuits in one compact block simplifies panel design
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
Does the 3RH29111FA22 mount on the front of a SIRIUS 3RT2 contactor frame size S00?
Yes, the block is designed for front mounting on SIRIUS 3RT2 contactors and 3RH2 contactor relays including frame size S00.
Which terminal screws must be tightened when wiring the four screw terminals on this auxiliary contact block?
All four screw terminals accept standard screw connections; tighten each terminal screw securely to ensure reliable contact for the 2NO and 2NC circuits.
How often should the IP20-rated contacts be inspected for wear in a 690V AC control circuit?
Inspect the auxiliary contacts during scheduled panel maintenance; replace the block if contact tips show erosion or if switching reliability declines.
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