The Siemens 3RV2901-2A is an auxiliary switch for SIRIUS 3RV2 motor starter protectors, lateral (side-mounted), with 1 NO+1 NC contacts and screw terminals. Siemens describes it as: Auxiliary switch can be mounted on the side 1 NO+1 NC spring-type terminal for circuit breaker 3RV2.
Auxiliary switches report the switching state of the breaker to the PLC or to an indicator lamp, so the control system knows when a motor feeder has been switched off or has tripped. The side-mounted version fits on the left of the breaker and leaves the front free.
See our Siemens industrial controls for 3RV2 breakers.
Technical data
| Siemens order number | 3RV2901-2A |
|---|---|
| Product | Auxiliary switch for 3RV2 circuit breaker |
| Mounting | lateral (side-mounted) |
| Contacts | 1 NO+1 NC |
| Operational current AC-15 at 230 V | 4 A |
| Operational current DC-13 at 24 V | 2 A |
| Connection type | spring-loaded terminals |
| Dimensions (W x H x D) | 9.5 x 90 x 68 mm |
| Net weight | 0.042 kg |
| Condition | New, original Siemens |
Typical applications
- Feedback of breaker ON/OFF state to the PLC
- Signalling lamps for feeder status on panel doors
- Interlocking in motor control circuits
Compatibility and replacement
Fits SIRIUS 3RV2 circuit breakers of sizes S00 and S0 (and larger where stated by Siemens). Up to two lateral auxiliary switches can be fitted per breaker in many configurations; check the Siemens manual.
Frequently asked questions
Which breakers does it fit?
SIRIUS 3RV2 motor starter protectors (3RV201, 3RV202 and, per Siemens, other sizes with the same accessory slot).
Does it signal a trip?
It follows the main contacts. For a separate “tripped” signal Siemens offers alarm switches.
Can I get a price and delivery time?
Prices are quoted on request. Send the order number, quantity and delivery country on WhatsApp and we will reply with price and delivery time; air shipping is usually 5 to 7 days once ready, with a 1-year warranty.
Before you order
Compare the complete order number on the old unit with this page, including the suffix: in most ranges the last characters set the coil voltage, current range or version. If the label is worn, send us a photo and we will identify the part.
Need it fast? Send the order number, quantity and delivery country on WhatsApp or through the inquiry form and we reply with a quotation the same working day. All parts are new and original, covered by a 1-year warranty, and ship worldwide by air in 5 to 7 days once ready (shipping, payment and warranty). Local agents: Saudi Arabia, Iraq, the UAE, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan.
