5ST3021 | Siemens Sentron 5ST3 Fault Signal Contact 2 NO Suitable For MCB 5SL, 5SY, 5SP RCBO 5SU1, FI 5SV – Siemens

Name: 5ST3021 | Siemens Sentron 5ST3 Fault Signal Contact 2 NO Suitable For MCB 5SL, 5SY, 5SP RCBO 5SU1, FI 5SV - Siemens - myelectric.in
Brand: Siemens
SKU: 5ST3021
Price: 1582.40 INR
Availability: OutOfStock

SKU: 5ST3021

Original price was: ₹3,440.00.Current price is: ₹1,582.40. Excl. GST

Out of stock

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Sourced through authorised channels, the Siemens 5ST3021 miniature circuit breaker (mcb) delivers dependable performance for reliable circuit protection and isolation. myelectric.in stocks the 5ST3021 | Siemens Sentron 5ST3 Fault Signal Contact 2 NO Suitable For MCB 5SL, 5SY, 5SP RCBO 5SU1, FI 5SV for contractors, panel builders, and project buyers — buy online with GST invoice, or request a bulk quote for domestic supply and export to UAE, Singapore, UK, USA, Sri Lanka and more.

📋 Technical Specifications

Parameter	Value
Brand	Siemens
Part Number / SKU	5ST3021
Category	Miniature Circuit Breaker (MCB)
Contact Configuration	2 NO (Normally Open)
Rated Voltage	230/400V AC
Rated Frequency	50/60 Hz
Trip Mechanism	Thermal-magnetic (bimetal overload + electromagnetic short-circuit)
Mounting	35mm DIN rail (EN 60715)
Electrical Endurance	≥ 20,000 operating cycles (per IEC 60898-1)
Pollution Degree	3 (per IEC 60664-1)
Standard	IS 8828 / IEC 60898-1 (residential) and IEC 60947-2 (industrial)
Certifications	BIS certified, CE, cULus (select models)

⚡ Key Features

Thermal-magnetic trip mechanism — bimetal element trips on sustained overload, instantaneous magnetic trip on short-circuit; two independent protection functions in one compact module.
Manufactured to IS 8828 / IEC 60898-1 (residential) and IEC 60947-2 (industrial) — 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 2 NO (Normally Open) contact configuration on the 5ST3021 mean?

A: These contacts change state when the device is operated or energised. Size the contact for the actual switched load — pilot duty ratings are typically lower than the main contact rating.

Q: Is the 5ST3021 suitable for both single-phase and three-phase systems?

A: The 5ST3021 with multiple poles can protect three-phase circuits. Each pole simultaneously interrupts one phase — ensuring all phases are de-energised on a fault.

Q: Can the 5ST3021 be DIN rail mounted in any standard distribution board?

A: Yes. This Siemens MCB uses the standard 35mm EN 60715 DIN rail and 17.5mm module width, making it compatible with all major brand distribution boards and enclosures. Terminal capacity accommodates both rigid and flexible conductors up to the rated cross-section.

Q: What happens when the 5ST3021 trips — how do I identify and reset it?

A: When the 5ST3021 trips on fault, the handle moves to a midway position (between ON and OFF), distinctly visible from a distance. To reset: (1) identify and rectify the fault, (2) push the handle fully to OFF, (3) then switch back to ON. Never force-reset without investigating the fault cause.