3RT20152BB42 | power contactor, 7 A, 3-pole, 24 V DC, auxiliary contacts: 1 NC, spring-loaded terminal – Siemens

Name: Siemens 3RT20152BB42 24V DC Power Contactor 7A 3-Pole
Brand: Siemens
SKU: 3RT20152BB42
Price: 1672.10 INR
Availability: OutOfStock

SKU: 3RT20152BB42

Original price was: ₹3,635.00.Current price is: ₹1,672.10. Excl. GST

Out of stock

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📋 Technical Specifications

Parameter	Value
Brand	Siemens
Part Number / SKU	3RT20152BB42
Category	Contactor
Series / Model	3RT
Contact Configuration	1 NC (Normally Closed)
Current Rating	7 A
Voltage Rating	24V AC
Standard	IEC 60947-4-1, IS 13947
Certifications	BIS certified, CE, cULus (select models)

⚡ Key Features

7 A AC-3 rated — suits up to a 4 kW squirrel-cage induction motor at 415V for direct-on-line (DOL) starting and running.
Manufactured to IEC 60947-4-1 / IS 13947-4-1 — 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: Is the 3RT20152BB42 rated 7 A for AC-3 motor duty or AC-1 resistive duty?

A: The 7 A rating of this Siemens contactor applies to AC-3 duty (squirrel cage motor starting and running). For AC-1 (resistive/non-inductive) loads, the current can be up to ~1.3× the AC-3 rating. AC-4 (plugging/reversing) requires significant de-rating — consult the Siemens selection table.

Q: What does the 1 NC (Normally Closed) contact configuration on the 3RT20152BB42 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: What is the electrical and mechanical life of the 3RT20152BB42?

A: Siemens contactors are rated for millions of operations: typically 10–30 million mechanical operations and 1–3 million electrical operations at rated current and voltage (AC-3 duty). High-frequency switching applications (>10 operations/hour) require checking the specific thermal capacity of the contactor for continuous duty without overheating.

Q: Can the 3RT20152BB42 be used for reversing duty (forward/reverse motor control)?

A: Contactors used for reversing must be wired with two contactors interlocked so only one can energise at a time. The Siemens 3RT provides mechanical interlock kits that physically prevent both contactors from closing simultaneously — mandatory for reversing and brake applications to prevent phase-to-phase short circuits.

Q: Can multiple 3RT20152BB42 contactors be wired for star-delta starting?

A: Yes. Star-delta starters use three contactors: main (KM1), star (KM2), and delta (KM3). The Siemens 3RT series supports mechanical and electrical interlocking accessories that prevent simultaneous energisation of star and delta contactors — critical for safety. Ensure all three contactors are rated correctly for the motor FLC and star-delta transition current.