3TS3700-0AF74-8K | Siemens 3TS3 Power Contactor 65 A, 4 Pole, 81-136 V AC, AC1 Duty, Size 2, Electronic Coil – Siemens

Name: 3TS3700-0AF74-8K | Siemens 3TS3 Power Contactor 65 A, 4 Pole, 81-136 V AC, AC1 Duty, Size 2, Electronic Coil - Siemens - myelectric.in
Brand: Siemens
SKU: 3TS3700-0AF74-8K
Price: 6116.00 INR
Availability: OutOfStock

SKU: 3TS3700-0AF74-8K

Original price was: ₹13,900.00.Current price is: ₹6,116.00. Excl. GST

Out of stock

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The Siemens 3TS3700-0AF74-8K is a contactor, engineered for motor control and switching in demanding Indian and international installations. Key ratings include 65 A, 136V AC, 4 Poles. Buy the 3TS3700-0AF74-8K | Siemens 3TS3 Power Contactor 65 A, 4 Pole, 81-136 V AC, AC1 Duty, Size 2, Electronic Coil 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	3TS3700-0AF74-8K
Category	Contactor
Coil Voltage	136V AC
Current Rating	65 A
Poles	4 Poles
Utilisation Category	AC-3 (motor duty) / AC-1 (resistive)
Rated Frequency	50/60 Hz
Motor Power (AC-3, 415V)	Up to 30 kW
Coil Operating Range	0.8–1.1 × rated coil voltage (Uc)
Mounting	35mm DIN rail or screw fixing
Standard	IEC 60947-4-1 / IS 13947-4-1
Certifications	BIS certified, CE, cULus (select models)

⚡ Key Features

65 A AC-3 rated — suits up to a 30 kW squirrel-cage induction motor at 415V for direct-on-line (DOL) starting and running.
136V AC coil — connects directly to pushbutton station, PLC digital output, or timer relay; suitable for standard 50Hz Indian industrial control circuits.
4 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 3TS3700-0AF74-8K rated 65 A for AC-3 motor duty or AC-1 resistive duty?

A: The 65 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: The 3TS3700-0AF74-8K has a coil voltage of 136V AC — what control supply is needed?

A: This Siemens device requires a 136V AC control supply connected to the coil terminals (A1 and A2). For AC coils, ensure the control circuit voltage is stable — voltage drops below 85% of rated coil voltage can cause chatter and coil overheating. Always fit a surge suppressor across the coil when switching with a PLC or solid-state relay.

Q: Can multiple 3TS3700-0AF74-8K contactors be wired for star-delta starting?

A: Yes. Star-delta starters use three contactors: main (KM1), star (KM2), and delta (KM3). The Siemens contactor 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 3TS3700-0AF74-8K?

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 3TS3700-0AF74-8K 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 series 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.