The Siemens 3RV2901-1F is a front-mounting transverse auxiliary switch block featuring 2 Normally Open (2 NO) contacts designed specifically for SIRIUS 3RV2 Motor Starter Protectors / Circuit Breakers (Frame Sizes S00, S0, S2, and S3).
Snapping seamlessly into the front face of the breaker, it provides instantaneous position feedback to PLCs, control relays, or pilot lights without adding any extra lateral width to the circuit breaker inside the control panel.
2 NO Contact Configuration: Provides dual Normally Open auxiliary contacts that close when the main circuit breaker contacts are closed.
Front Transverse Mounting: Plugs directly into the front upper slot of 3RV2 breakers, saving valuable space on the DIN rail.
Universal 3RV2 Compatibility: Fits across all SIRIUS 3RV2 frame sizes: S00, S0, S2, and S3.
Reliable Screw Terminals: Uses heavy-duty screw-type terminals for simple, secure wiring up to $2.5\text{ mm}^2$.
High Electrical Reliability: Features solid contact bridge mechanics engineered for long service life and micro-switching safety in PLC signal circuits.
Finger-Safe Touch Protection: Shrouded IP20 terminals protect personnel from direct live contact during panel wiring and maintenance.
PLC & Automation State Feedback (Circuit Breaker ON / OFF status monitoring)
Control Circuit Interlocking & Auxiliary Contactor Logic
Industrial Distribution Panels & Motor Control Centers (MCCs)
OEM Machine Building with Compact Control Panel Requirements
Q1: How does the 3RV2901-1F differ from the 3RV2901-1E auxiliary switch?
A: The difference lies in the contact arrangement. The 3RV2901-1F has 2 NO (2 Normally Open) contacts, whereas the 3RV2901-1E features 1 NO + 1 NC (1 Normally Open + 1 Normally Closed) contacts.
Q2: Does installing this transverse auxiliary switch increase the width of the 3RV2 breaker?
A: No. Because it mounts on the front face of the breaker, it keeps the overall module width at 45 mm, making it ideal for high-density control panels where DIN rail space is limited.
Q3: Can I use this front auxiliary switch together with a side-mounted accessory (like the 3RV2921-1M signaling switch)?
A: Yes. The front-transverse auxiliary slot is completely independent of the left-side and right-side accessory slots, allowing you to use both simultaneously on a single 3RV2 breaker.
Siemens SIRIUS 3RV2 Motor Starter Protectors: Compatible across all 3RV20, 3RV21, and 3RV24 models (Sizes S00 to S3).
Siemens 3RV2921-1M Lateral Signaling Switches: Side-mounted switches for differentiating short-circuit vs. overload trips.
Siemens 3RV2902 Series Shunt Trips / Undervoltage Releases: Right-side accessories for remote electrical trip control.
| Specification | Details |
|---|---|
| Product Name | Auxiliary Contact Block |
| Brand | Siemens |
| Series | SIRIUS 3RV2 |
| Model Number | 3RV2901-1F |
| SKU | 3RV2901-1F |
| Product Type | Auxiliary Contact Block |
| Contact Configuration | 2NO (2 Normally Open) |
| Number of Contacts | 2 |
| Mounting Position | Front Mounted |
| Compatible Series | Siemens 3RV2 Motor Protection Circuit Breakers |
| Compatible Sizes | S00, S0, S2, S3 |
| Connection Type | Screw Terminals |
| Contact Type | Instantaneous Auxiliary Contacts |
| Rated Operational Current (AC-15, 230V) | 0.5A |
| Application | Signaling, Status Indication, PLC Interface |
| Installation Method | Direct Snap-On Mounting |
| Product Family | Siemens SIRIUS Accessories |
| Industrial Applications | MCC Panels, Control Panels, Automation Systems, Motor Starters |
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