3RT12756AF36 | vacuum contactor AC3e/AC3 400 A, 200 kW / 400 V, 3pole, Uc: 110127 V AC(5060 Hz) / DC drive: conventional auxiliary contacts 2 NO + 2 NC main circuit: busbar control and auxiliary circuit: screw terminal Siemens

Name: 3RT12756AF36 | vacuum contactor AC3e/AC3 400 A, 200 kW / 400 V, 3pole, Uc: 110127 V AC(5060 Hz) / DC drive: conventional auxiliary contacts 2 NO + 2 NC main circuit: busbar control and auxiliary circuit: screw terminal Siemens - myelectric.in
Brand: Siemens
SKU: 3RT12756AF36
Price: 183282.00 INR
Availability: OutOfStock

SKU: 3RT12756AF36

Original price was: ₹416,550.00.Current price is: ₹183,282.00. Excl. GST

Out of stock

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📋 Technical Specifications

Parameter	Value
Brand	Siemens
Part Number / SKU	3RT12756AF36
Category	Contactor
Series / Model	3RT
Contact Configuration	2 NO + 2 NC
Current Rating	400 A
Voltage Rating	400V AC
Poles	3 Poles
Power Rating	200 kW
Standard	IEC 60947-4-1, IS 13947
Certifications	BIS certified, CE, cULus (select models)

⚡ Key Features

400 A AC-3 rated for motor and resistive load switching at LV.
3 Poles main contacts with silver-alloy (AgSnO₂) tips — rated for AC-3 duty (DOL motor starting/stopping); low contact resistance reduces heat at rated current.
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 3RT12756AF36 rated 400 A for AC-3 motor duty or AC-1 resistive duty?

A: The 400 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 2 NO + 2 NC contact configuration on the 3RT12756AF36 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 multiple 3RT12756AF36 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.

Q: What is the electrical and mechanical life of the 3RT12756AF36?

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 3RT12756AF36 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.

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