ML Contactor 40A 3P 415V AC In Built 2NO+2NC AC-3 440V AC 50 Hz | L&T – SS90721POOO

Name: L&T ML Contactor 40A 3P 415V AC, 2NO+2NC, AC-3 440V, 50Hz | Reliable Electrical Component
Brand: Lauritz Knudsen (L&T)
SKU: SS90721POOO
Price: 15184.40 INR
Availability: InStock

SKU: SS90721POOO

Original price was: ₹22,330.00.Current price is: ₹15,184.40. Excl. GST

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Looking for the ML Contactor 40A 3P 415V AC In Built 2NO+2NC AC-3 440V AC 50 Hz | L&T? This genuine SS90721POOO contactor is built for motor control and switching, combining proven reliability with full compliance to applicable IEC/IS standards. Key ratings include 40 A, 415V AC, 3 Poles. Order part number SS90721POOO from myelectric.in — a trusted SS90721POOO supplier offering competitive pricing, GST billing, and shipping across India and overseas.

📋 Technical Specifications

Parameter	Value
Brand	SS90721POOO
Part Number / SKU	SS90721POOO
Category	Contactor
Contact Configuration	2 NO + 2 NC
Current Rating	40 A
Voltage Rating	415V AC
Poles	3 Poles
Frequency	50 Hz
Utilisation Category	AC-3 (motor duty) / AC-1 (resistive)
Rated Frequency	50/60 Hz
Motor Power (AC-3, 415V)	Up to 18.5 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 where applicable

⚡ Key Features

40 A AC-3 rated — suits up to a 18.5 kW squirrel-cage induction motor at 415V for direct-on-line (DOL) starting and running.
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 where applicable — meets Indian regulatory requirements for use in government, commercial, and industrial electrical installations.
Genuine authorised SS90721POOO 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 SS90721POOO rated 40 A for AC-3 motor duty or AC-1 resistive duty?

A: The 40 A rating of this SS90721POOO 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 SS90721POOO selection table.

Q: What does the 2 NO + 2 NC contact configuration on the SS90721POOO 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 SS90721POOO contactors be wired for star-delta starting?

A: Yes. Star-delta starters use three contactors: main (KM1), star (KM2), and delta (KM3). The SS90721POOO 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 SS90721POOO?

A: SS90721POOO 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 SS90721POOO 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 SS90721POOO 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.