ML Contactor 25A 3P 415V AC In Built 2NO+2NC AC-3 320V AC Coil 50 Hz | L&T – SS91851ROOO

Name: ML Contactor 25A 3P 415V AC In Built 2NO+2NC AC-3 320V AC Coil 50 Hz | L&amp;T - SS91851ROOO
Brand: Lauritz Knudsen (L&amp;T)
SKU: SS91851ROOO
Availability: OutOfStock

SKU: SS91851ROOO

Original price was: ₹8,150.00.Current price is: ₹5,542.00. Excl. GST

Out of stock

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Sourced through authorised channels, the SS91851ROOO SS91851ROOO contactor delivers dependable performance for motor control and switching. Key ratings include 25 A, 320V AC, 3 Poles. myelectric.in stocks the ML Contactor 25A 3P 415V AC In Built 2NO+2NC AC-3 320V AC Coil 50 Hz | L&T 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	SS91851ROOO
Part Number / SKU	SS91851ROOO
Category	Contactor
Coil Voltage	320V AC
Contact Configuration	2 NO + 2 NC
Current Rating	25 A
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 11 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

25 A AC-3 rated — suits up to a 11 kW squirrel-cage induction motor at 415V for direct-on-line (DOL) starting and running.
320V AC coil — connects directly to pushbutton station, PLC digital output, or timer relay; suitable for standard 50Hz Indian industrial control circuits.
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 SS91851ROOO 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 SS91851ROOO rated 25 A for AC-3 motor duty or AC-1 resistive duty?

A: The 25 A rating of this SS91851ROOO 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 SS91851ROOO selection table.

Q: The SS91851ROOO has a coil voltage of 320V AC — what control supply is needed?

A: This SS91851ROOO device requires a 320V 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: What is the electrical and mechanical life of the SS91851ROOO?

A: SS91851ROOO 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 SS91851ROOO 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 SS91851ROOO 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.

Q: Can multiple SS91851ROOO contactors be wired for star-delta starting?

A: Yes. Star-delta starters use three contactors: main (KM1), star (KM2), and delta (KM3). The SS91851ROOO 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.