L&T Larsen & Toubro MNX 25 Power Contactors 220-240V AC, 3 Pole
L&T Larsen & Toubro MNX 25 Power Contactors 220-240V AC, 3 Pole
L&T Larsen & Toubro MNX 25 Power Contactors 220-240V AC, 3 Pole
The L&T MNX 25 is a three-pole power contactor rated for 220-240V AC operation, designed for reliable electromagnetic switching in industrial motor control circuits and heavy-duty electrical distribution systems. Professional electricians, industrial maintenance technicians, and automation engineers rely on this contactor to manage motor starting, stopping, and reversing operations with consistent performance across demanding applications. This contactor solves critical switching challenges in manufacturing plants, HVAC systems, and process automation by providing robust electrical isolation, arc suppression, and long operational life under continuous duty cycles.
Product Overview
The MNX 25 contactor operates on the principle of electromagnetic induction, where an AC coil energized at 220-240V creates a magnetic field that pulls armature contacts into engagement with fixed stationary contacts. The three-pole configuration allows simultaneous switching of three separate electrical circuits, making it ideal for three-phase motor control applications. The contactor's robust construction includes silver-cadmium alloy contacts that resist erosion and welding, a mechanical latch mechanism for reliable operation, and integrated arc suppression chambers that extinguish arcs instantaneously during contact separation, ensuring extended contact life and safety.
L&T's MNX series represents decades of manufacturing excellence in electrical switchgear, with this 25A model specifically engineered for medium-duty industrial applications requiring frequent on-off cycling. The contactor features a compact DIN rail-mountable design, making it suitable for control panels and distribution boards. Its thermal overload protection compatibility, silent operation, and minimal electromagnetic interference make it the preferred choice for textile mills, food processing units, water treatment facilities, and commercial HVAC installations across India.
Key Specifications
| Specification | Details |
| Product Type | Three-Pole Power Contactor |
| Brand | L&T Larsen & Toubro |
| Model | MNX 25 |
| Coil Voltage | 220-240V AC |
| Rated Current | 25 Amperes |
| Number of Poles | 3 Poles |
| Contact Configuration | 3NO (Normally Open) |
| Frequency | 50/60 Hz |
| Contact Material | Silver-Cadmium Alloy |
| Mounting | DIN Rail Compatible |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
Key Features
- Silver-Cadmium Alloy Contacts: Provides superior arc resistance and minimal contact erosion, ensuring reliable switching performance across 100,000+ operating cycles
- Integrated Arc Suppression: Built-in arc extinction chambers eliminate dangerous arcing during contact separation, protecting downstream equipment and extending contactor lifespan
- Compact DIN Rail Design: Space-efficient mounting on standard 35mm DIN rails, reducing control panel footprint and simplifying installation in crowded electrical enclosures
- Thermal Overload Relay Compatible: Seamlessly integrates with L&T thermal overload relays for comprehensive motor protection against overload and phase failure conditions
- Silent Operation: Electromagnetic design minimizes noise and vibration, making it suitable for noise-sensitive industrial environments and commercial installations
- Wide Coil Voltage Range: 220-240V AC operation accommodates standard Indian industrial power supply variations without performance degradation
Applications and Use Cases
- Three-Phase Motor Control: Direct switching of three-phase induction motors in textile mills, cement plants, and manufacturing units with ratings up to 5.5 kW at 415V three-phase
- HVAC System Management: Controls large commercial air conditioning compressors and fan motors in shopping malls, hospitals, and office buildings requiring frequent start-stop cycles
- Water Pumping Stations: Manages submersible and centrifugal pump motors in municipal water supply systems and agricultural irrigation with reliable remote control capability
- Industrial Process Automation: Provides electromagnetic switching in conveyor systems, packaging machinery, and assembly line automation requiring synchronized multi-circuit control
- Power Distribution Panels: Acts as main switching device in electrical distribution boards for factories and commercial establishments, isolating equipment for maintenance
- Lifting and Hoisting Equipment: Controls electric motors in cranes, hoists, and material handling systems where safe, repeatable switching is critical for worker safety
How to Use
Installation of the MNX 25 contactor begins with mounting on a DIN rail within your control panel or electrical enclosure. Ensure the coil terminals are connected to your 220-240V AC control circuit through appropriate control switches, push buttons, or programmable logic controllers. The three main contacts should be wired to the three-phase motor or load circuit, with proper wire gauges selected based on your 25A rating and local electrical codes. Always verify correct phase sequence and ensure all connections are tight to prevent voltage drop and overheating at contact points.
Before energizing the contactor, test the mechanical operation by manually pulling the armature to confirm smooth movement and audible click confirmation. Install a thermal overload relay in series with the motor circuit to protect against sustained overload conditions. For remote operation, connect your control circuit through appropriate interlocks and safety switches. Regular maintenance involves visual inspection of contacts for pitting or discoloration every six months, and replacement of the entire contactor if contacts show significant erosion or welding signs. Always de-energize the control circuit before performing any maintenance or inspection work.
Frequently Asked Questions
What is the maximum motor power rating for the MNX 25 contactor at 415V three-phase?
The MNX 25 is rated for approximately 5.5 kW at 415V three-phase operation. This rating assumes standard three-phase induction motors with normal starting torque. For high-starting-torque motors or applications with frequent starting cycles, consult L&T technical specifications or reduce the load rating by 10-15% to ensure extended contactor lifespan and reliable operation.
Can the MNX 25 be used for single-phase motor control?
While the MNX 25 has three poles, it can control single-phase motors by utilizing only one pole for the main circuit and leaving the other two poles unused or connected in parallel for increased current capacity. However, this is not recommended as it underutilizes the contactor and increases cost. For single-phase applications, L&T offers dedicated single-pole or two-pole contactors that are more economical and appropriately sized.
What is the electrical life expectancy of the MNX 25 contacts?
Under normal operating conditions with standard inductive loads, the MNX 25 contacts are rated for approximately 500,000 to 1,000,000 electrical operations. This lifespan depends heavily on load type, switching frequency, and whether proper arc suppression is functioning. Resistive loads extend contact life significantly, while high-inrush-current applications like motor starting may reduce life by 20-30%. Regular inspection and timely replacement ensure safety and reliability.
Is the MNX 25 contactor suitable for DC circuit switching?
No, the MNX 25 is specifically designed for AC operation at 50/60 Hz frequency. DC switching requires different contact materials and arc suppression mechanisms because DC arcs are more difficult to extinguish than AC arcs. Using this AC contactor for DC circuits will result in severe contact welding and potential equipment damage. Always use DC-rated contactors for direct current applications.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
Why Buy from The Tech Depot
- Genuine Products: Sourced directly from authorized distributors with authentication
- Expert Team: Our technical team validates every product before listing
- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
- Payment Options: COD, UPI, credit/debit cards, net banking, EMI available
- Technical Support: 24/7 expert guidance via email and WhatsApp
- Returns: 7-day return policy on manufacturing defects only
Buy L&T Larsen & Toubro MNX 25 Power Contactors 220-240V AC, 3 Pole Online in India
Purchase the L&T Larsen & Toubro MNX 25 Power Contactors 220-240V AC, 3 Pole online at The Tech Depot, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on L&T Larsen & Toubro MNX 25 Power Contactors 220-240V AC, 3 Pole with fast shipping and expert support.
Our team in Bengaluru is available 24/7 to support your journey from product selection to project completion.