3RV29011A | Siemens Sirius Auxiliary Switch, 1 NO + 1 NC, Screw Type, Suitable For 3RV2 MPCB – Siemens

Name: 3RV29011A | Siemens Sirius Auxiliary Switch, 1 NO + 1 NC, Screw Type, Suitable For 3RV2 MPCB - Siemens - myelectric.in
Brand: Siemens
SKU: 3RV29011A
Price: 1185.80 INR
Availability: InStock

SKU: 3RV29011A

Original price was: ₹2,695.00.Current price is: ₹1,185.80. Excl. GST

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The Siemens 3RV29011A is a motor protection circuit breaker (mpcb), engineered for reliable circuit protection and isolation in demanding Indian and international installations. Buy the 3RV29011A | Siemens Sirius Auxiliary Switch, 1 NO + 1 NC, Screw Type, Suitable For 3RV2 MPCB online at myelectric.in with GST invoice, genuine-product assurance, and fast delivery across India — bulk and worldwide export enquiries welcome.

📋 Technical Specifications

Parameter	Value
Brand	Siemens
Part Number / SKU	3RV29011A
Category	Motor Protection Circuit Breaker (MPCB)
Series / Model	3RV
Contact Configuration	1 NO + 1 NC
Trip Class	Class 10A (per IEC 60947-4-1)
Rated Operational Voltage	Up to 690V AC
Rated Frequency	50/60 Hz
Protection Functions	Thermal overload (adjustable), magnetic short-circuit, phase-loss
Mounting	35mm DIN rail or screw fixing
Reset	Manual reset after trip
Standard	IEC 60947-4-1, IEC 60947-2
Certifications	BIS certified, CE, cULus (select models)

⚡ Key Features

Combined thermal and magnetic protection in one device — single MPCB replaces a separate motor-rated MCB plus thermal overload relay, saving DIN rail space and inter-device wiring.
Phase-loss and phase-unbalance detection — trips within seconds of a phase failure, protecting the motor from the severe overheating that single-phasing causes within minutes.
Manual reset only — operator must acknowledge and reset the MPCB after a trip, preventing automatic restart that could damage the motor or driven machinery.
Manufactured to IEC 60947-4-1 and IEC 60947-2 — complies with the applicable Indian BIS and IEC international standards for this product category.
BIS certified, CE, cULus (select models) — meets Indian regulatory requirements for use in government, commercial, and industrial electrical installations.
Genuine authorised Siemens product — sourced directly from the official distribution network with full manufacturer traceability and warranty.
GST invoice provided for India orders — valid for corporate procurement, government project orders, and public tender supply via myelectric.in.
Worldwide export available — UAE, Singapore, UK, USA, Sri Lanka & more. Contact +91 94814 00316 for bulk pricing and international shipping.

❓ Frequently Asked Questions

Q: What does the 1 NO + 1 NC contact configuration on the 3RV29011A mean?

A: This device has both Normally Open (NO) and Normally Closed (NC) contacts. NO contacts close when the device operates (energised/tripped); NC contacts open. This allows both start-interlock and stop-interlock circuits from a single device.

Q: Can the 3RV29011A replace a contactor + overload relay combination in a motor circuit?

A: The 3RV29011A provides motor short-circuit protection and overload protection in one device — but it cannot make/break motor current under normal operational switching (that is the contactor’s role). For motor starters requiring on/off switching, the 3RV29011A is used as the upstream protection device with a contactor for switching. Some MPCB series include a direct handle for manual starting of small motors without a separate contactor.

Q: What is the trip class of the 3RV29011A and what motor starting time does it allow?

A: MPCBs are typically rated Class 10 (trips in ≤10 seconds at 7.2× setting current), suitable for normal motors with DOL starting times up to 10 seconds. Heavy-duty motors (large fans, centrifuges, compressors) with longer starting times may need Class 20 or Class 30 protection — check the starting time against the motor’s speed-torque curve and select accordingly.

Q: Which Siemens accessories are compatible with the 3RV29011A?

A: The Siemens 3RV series supports snap-on accessories including auxiliary contacts (OF), alarm contacts (SD), shunt trip coils (MX), undervoltage releases (MN), and comb busbars. Accessories are series-specific — always verify compatibility using the Siemens product catalogue before ordering. myelectric.in can advise on the correct accessory part numbers for the 3RV29011A.

Q: What is the difference between a Motor Protection Circuit Breaker (MPCB) and a standard MCB — and why use the 3RV29011A?

A: A standard MCB protects against overload and short-circuit only. A Motor Protection Circuit Breaker (MPCB) adds adjustable thermal overload matched to motor FLC, Class 10/20 trip curves for motor starting inrush, and phase-loss sensitivity — making it the correct device for motor branch circuits where a standard MCB would either nuisance-trip on motor starting or fail to protect adequately against slow overloads. Choose the 3RV29011A when the application specifically requires motor protection circuit breaker (mpcb) characteristics.