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Auxiliary Contact Block · 1 NC · front mount · screw terminal · Siemens 3RH29111BA01
SKU: SIE-3RH29111BA01
Front-mounted auxiliary contact block with 1 normally closed contact and screw terminals for Siemens SIRIUS 3RT2 contactors and 3RH2 contactor relays. Commonly used to add status or interlock signalling in control panels and industrial automation assemblies.
What this product is for
This auxiliary contact block adds 1 normally closed auxiliary contact to compatible Siemens SIRIUS control gear. It is used to expand control logic, status indication, interlocking, and feedback circuits in industrial panels.
Use for
Use for Siemens 3RT2 contactors and 3RH2 contactor relays where a front-mounted 1 NC auxiliary contact is required. Suitable for control circuits, motor starters, machinery panels, and automation assemblies using screw terminal wiring.
Avoid for
Avoid for applications requiring normally open contacts, changeover contacts, or compatibility with non-matching contactor series. Confirm the host device series and mounting position before ordering.
Best for
Best for electricians and panel builders who need a simple front-mount auxiliary contact for signalling or interlock functions on Siemens SIRIUS contactors and relays. Screw terminals suit control wiring where secure landed conductors are preferred.
Installed in
Typically installed in industrial control panels, motor control centres, OEM machinery, and automation cabinets. This block mounts on the front of the compatible device and uses terminal designation 71/72 for the NC contact.
Why this product exists
It allows contractors and panel shops to add an extra auxiliary contact without replacing the main contactor or relay assembly. This helps when a control scheme needs additional feedback, permissive, or shutdown logic.
Compared with similar products
Compared with multi-contact auxiliary blocks, this version is a compact single-function option with 1 NC contact only. Compared with push-in styles, this model uses screw terminals and cable entry from below, which may better match existing panel wiring practices.
Specifications
- Product type: Auxiliary contact block
- Contact arrangement: 1 NC
- Mounting position: Front mount
- Terminal type: Screw terminal
- Terminal marking: 71/72
- Cable entry: From below
- Compatible series: Siemens SIRIUS 3RT2 contactors and 3RH2 contactor relays
- Typical use: Control, signalling, interlock, and feedback circuits
- ApplicationControl, signalling, interlock, and feedback circuits
- Terminal TypeScrew terminal
- Contact Arrangement1 NC
- Cable EntryFrom below
- Compatible SeriesSiemens SIRIUS 3RT2 contactors and 3RH2 contactor relays
- BrandsSiemens
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