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Thermal Overload Relays

Motor protection devices that prevent damage from overload and phase failure conditions

Thermal Overload Relays for Motor Protection

L&T Thermal Overload Relays for comprehensive motor protection in industrial applications

RTO Series Thermal Relay MN Series Thermal Relay ML Series Thermal Relay ML Series Thermal Relay

MN Series (For MNX Power Contactors)

Standard Range

Complements MNX power contactors for comprehensive motor protection ranging from 0.2A to 570A.

Series Type MN 2, MN 5, MN 12
Current Range 0.2A to 570A
Mounting Direct on MNX Contactors
Protection Class IP20
MN 2 Series

Range: 0.6A to 40A

SS94141OOKO (0.6–1A) SS94145OOFO (24–40A) SS94142OOOO (1.3–2A) SS94143OOOO (1.8–2.8A)
MN 5 Series

Range: 9A to 110A

SS94137OOKO (66–110A) SS94135OOOO (16–25A) SS94136OOOO (23–36A) SS94138OOOO (80–115A)
MN 12 Series

Range: Up to 570A

SS94139OORO (270–450A) SS94140OOOO (420–570A) SS94144OOOO (180–250A)
Key Features:
  • Ambient temperature compensation for accurate protection
  • Phase failure protection as standard
  • Manual/auto reset selection facility
  • Test button for functional verification
  • Compatible with MNX contactor range

ML Series (For ML Contactors)

Compact Design

Direct mounting for ML contactors in compact motor starter applications.

Series Type ML 1, ML 2, ML 3
Current Range 0.15A to 42A
Mounting Direct on ML Contactors
IP Rating IP20
ML 1 Series

Range: 0.15A to 16A

SS91858OOBO (10–16A) SS91857OOOO (4.5–7.2A) SS91856OOOO (2.8–4.5A) SS91855OOOO (1.6–2.5A)
ML 2 / ML 3 Series

Range: Up to 42A

SS91859OOCO (13–21A) SS91859OOEO (20–32A) SS91860OOOO (28–42A) SS91861OOOO (36–52A)

RTO Series (For MO Power Contactors)

Modular Design

Designed for MO power contactors with direct mounting options for modular feeder solutions.

Series Type RTO-1, RTO-2
Current Range 0.2A to 110A
Mounting Direct on MO Contactors
RTO-1 Series
CS96355OOQO (2.4–3.6A) CS96354OOOO (1.6–2.4A) CS96353OOOO (1.0–1.6A) CS96352OOOO (0.63–1.0A)
RTO-2 Series
CS96366OOEO (20–31A) CS96365OOOO (13–20A) CS96364OOOO (8–13A) CS96363OOOO (5.5–8.3A)

MK1 Series (Standard Relays)

General Purpose

Standard relays for MK1 contactors, typically used in general industrial applications.

Current Range 0.6A to 22A
Mounting Direct on MK1 Contactors
Application General motor protection
Available Models
SS90035OOPO (1.5–2.5A) SS90035OOAO (9–14A) SS90036OOOO (18–27A) SS90034OOOO (0.63–1A) SS90037OOOO (25–40A)

Thermal Overload Relay Selection Guide

Series Typical Mounting Current Range Primary Application Compatible Contactors
MN2/MN5 Direct on MNX Contactors 0.2A – 110A General industrial motor protection MNX Series
MN 12 Separate/Direct Up to 570A Large motors and heavy industrial use MNX Large Frame
ML 1/2/3 Direct on ML Contactors 0.15A – 42A Compact motor starters ML Series
RTO Direct on MO Contactors 0.2A – 110A Modular feeder solutions MO Series
MK1 Direct on MK1 Contactors 0.6A – 22A Standard motor protection MK1 Series

Motor Protection Circuit Breakers (MPCB)

Combined overload and short-circuit protection devices specifically designed for motor protection

Motor Protection Circuit Breakers

L&T MOG Series Motor Protection Circuit Breakers for reliable motor safeguarding

MOG-S1 MPCB

MOG-S1 Series (Rocker Type)

Industrial Grade

Rocker-type MPCBs primarily used in industrial and commercial applications for reliable motor safeguarding.

Operation Type Rocker Manual Switching
Current Ratings 0.1A to 32A
Breaking Capacity 100kA at 240V AC, 50kA at 415V AC
Protection Thermal-magnetic
Available Models
ST41899OOOO (9.00-13.00 A) ST41891OOOO (0.25-0.4 A) ST41892OOOO (0.4-0.63 A) ST41893OOOO (0.63-1 A) ST41894OOOO (1-1.6 A) ST41895OOOO (1.6-2.5 A) ST41896OOOO (2.5-4 A) ST41897OOOO (4-6.3 A) ST41898OOOO (6.3-9 A) ST41900OOOO (13-18 A) ST41901OOOO (18-25 A) ST41902OOOO (25-32 A)
Key Features:
  • Rocker type operation for easy manual switching
  • High breaking capacity for reliable protection
  • Thermal-magnetic protection against overload and short circuits
  • Compact design for space-saving installation
  • Clear trip indication for easy fault identification

MOG-H1 & MOG-H1M Series (Rotary Type)

High Performance

Rotary handle type MPCBs designed for applications requiring high breaking capacity in a compact size.

Operation Type Rotary Handle
Current Ratings Up to 32A
Breaking Capacity 100kA at 240V AC, 50kA at 415V AC
Features High switching durability
Available Models
ST41937OOOO (32 A rating) ST41928OOOO (1.6 A rating) ST41929OOOO (2.5 A rating) ST41930OOOO (4 A rating) ST41931OOOO (6.3 A rating) ST41932OOOO (10 A rating) ST41933OOOO (13 A rating) ST41934OOOO (18 A rating) ST41935OOOO (25 A rating) ST41936OOOO (32 A rating)
Design Advantages:
  • Rotary handle for reliable operation
  • Reduced wiring work during installation
  • High switching durability for frequent operations
  • Compact size for panel space optimization
  • Suitable for harsh industrial environments

MOG-H2 & MOG-H2M Series (High Capacity)

Heavy Duty

High capacity MPCBs designed for robust industrial demands with higher current requirements.

Operation Type Rotary Type
Current Ratings Up to 63A
Breaking Capacity 50kA at 415V AC
Application Heavy industrial use
Available Models
ST41941OOOO (63 A rating) ST41921OOOO (50 A rating) ST41922OOOO (63 A rating) ST41923OOOO (80 A rating) ST41924OOOO (100 A rating) ST41925OOOO (125 A rating) ST41926OOOO (160 A rating) ST41927OOOO (200 A rating)
Industrial Applications:
  • Heavy machinery motor protection
  • Pump and compressor motor protection
  • HVAC system motor protection
  • Conveyor system motor protection
  • Automation system motor protection

MPCB Specifications Overview

Common Features:
  • Combined overload and short-circuit protection
  • Motor protection curves (Class 10)
  • Phase failure protection
  • Ambient temperature compensation
  • Manual ON/OFF operation
Technical Standards:
  • IEC/EN 60947-4-1
  • IEC/EN 60947-2
  • IS/IEC 60947-4-1
  • CE Certified
  • RoHS Compliant

Motor Starters

Complete motor control and protection solutions for various industrial applications

Motor Starters for Industrial Applications

Complete motor starter solutions with contactors and overload protection

DOL Starter Star-Delta Starter

Direct-On-Line (DOL) Starters

Basic Starting

Simple and economical motor starters for applications where high starting current is acceptable.

Starting Method Direct On Line
Motor Rating Up to 10 HP
Components Contactor + Overload Relay
Application Small motors
Standard DOL Starters
MNX 9 + MN 2 (Up to 3HP) MNX 12 + MN 2 (Up to 5HP) MNX 18 + MN 2 (Up to 7.5HP) MNX 25 + MN 2 (Up to 10HP)
Heavy Duty DOL Starters
MNX 40 + MN 5 (Up to 20HP) MNX 65 + MN 5 (Up to 30HP) MNX 95 + MN 5 (Up to 50HP) MNX 150 + MN 12 (Up to 100HP)
Applications:
  • Small pumps and compressors
  • Fans and blowers
  • Conveyors and material handling
  • Machine tools
  • Small automation equipment

Star-Delta Starters

Reduced Current Starting

Reduced current starting method for medium to large motors, minimizing starting current by 1/3.

Starting Method Star-Delta
Motor Rating 10 HP to 200 HP
Components 3 Contactors + Timer + OLR
Starting Current Reduced by 1/3
Small Capacity
MNX 18x3 + Timer (10-20HP) MNX 25x3 + Timer (20-30HP)
Medium Capacity
MNX 40x3 + Timer (30-50HP) MNX 65x3 + Timer (50-75HP)
Large Capacity
MNX 95x3 + Timer (75-125HP) MNX 150x3 + Timer (125-200HP)
Benefits:
  • Reduced starting current
  • Smooth motor acceleration
  • Reduced voltage drop on power lines
  • Longer motor life
  • Energy efficient starting

Soft Starters

Advanced Starting

Electronic motor starters providing smooth acceleration and deceleration with programmable parameters.

Starting Method Voltage Ramp
Motor Rating Up to 1000 HP
Control Microprocessor-based
Features Programmable parameters
Standard Soft Starters
SSW-050 (Up to 50HP) SSW-100 (Up to 100HP) SSW-200 (Up to 200HP) SSW-300 (Up to 300HP)
Advanced Soft Starters
SSW-500 (Up to 500HP) SSW-750 (Up to 750HP) SSW-1000 (Up to 1000HP)
Advanced Features:
  • Programmable acceleration/deceleration
  • Current limiting function
  • Motor parameter monitoring
  • Built-in bypass contactor
  • Communication options (Modbus, Profibus)

Motor Starter Comparison

Starter Type Starting Current Motor Rating Applications Key Advantages
DOL Starter 6-8 times full load current Up to 10 HP Small pumps, fans, conveyors Simple, economical, easy maintenance
Star-Delta Starter 2-3 times full load current 10 HP to 200 HP Medium motors, compressors, crushers Reduced starting current, cost-effective
Soft Starter 2-4 times full load current Up to 1000 HP Large motors, pumps, conveyors, fans Smooth acceleration, programmable, advanced protection

Changeover Switches

Manual and automatic power transfer solutions for reliable source switching

Changeover Switches for Power Transfer

L&T Changeover Switches for reliable power transfer between sources

C-Line Changeover Modular Changeover

C-Line Series (Heavy Industrial)

Industrial Grade

Robust, high-performance onload changeover switch-disconnectors designed for heavy industrial use.

Current Ratings 63A to 2000A
Frame Sizes 6 sizes available
Contact System Double-break, knife-type
IP Rating IP54 (with enclosure)
Small Frame
CO10630OOOO (63A) CO11630OOOO (63A) CO11631OOOO (80A) CO11632OOOO (100A)
Medium Frame
CO12630OOOO (125A) CO12631OOOO (160A) CO12632OOOO (200A) CO13630OOOO (250A)
Large Frame
CO14630OOOO (400A) CO15630OOOO (630A) CO16630OOOO (800A) CO17630OOOO (1000A) CO18630OOOO (2000A)
Key Features:
  • Double-break, knife-type contact system
  • Terminal shrouds and phase barriers for safety
  • Source separators for touch-proof design
  • Available in open execution and sheet steel enclosures
  • Motorized versions with manual override capability

Tripper/Modular Series

Residential/Commercial

MCB-type changeover switches suitable for simpler installations and house panels, offering easy integration with other modular devices.

Current Ratings 6A to 63A
Design Modular format
Mounting Standard panel mounting
Types Manual & Automatic (ACCL)
Manual Changeover Switches
AUC1000C (10A, 2-pole) AUC2000C (20A, 2-pole) AUC3200C (32A, 2-pole) AUC4000C (40A, 2-pole) AUC6300C (63A, 2-pole)
Automatic Changeover (ACCL)
AUCL1000C (10A, 2-pole) AUCL2000C (20A, 2-pole) AUCL3200C (32A, 2-pole) AUCL6300C (63A, 2-pole) BCL6300C (63A, 3-pole)
ACCL Features:
  • Automatic switching between main and generator supply
  • Current limiter to prevent generator overload
  • Adjustable time delays for switching
  • Voltage monitoring and alarm indication
  • Compact modular design for easy installation

Changeover Switch Selection Guide

Series Control Type Current Range Primary Use Key Model Prefixes
C-Line Manual, Motorized, Fused 63A – 2000A Heavy Industrial, Commercial CO (e.g., CO10630OOOO)
Tripper/Modular Manual (MCB Type), Automatic (ACCL) 6A – 63A Residential, Light Commercial AUC, AUCL, BCL
Applications for C-Line:
  • Industrial plants and factories
  • Commercial buildings and malls
  • Hospitals and healthcare facilities
  • Data centers and IT facilities
Applications for Modular Series:
  • Residential buildings and apartments
  • Shops and small commercial establishments
  • Schools and educational institutions
  • Small workshops and offices

Technical Support & Contact

Complete Electrical Solutions

We provide comprehensive electrical products and solutions for industrial, commercial, and residential applications. Our technical team can help with product selection, sizing, and installation guidance.

Contact
  • Phone: +91 9953979322
  • Email: mk3globalsolutionsales@gmail.com
Services
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  • Technical specifications
  • Application engineering
  • Installation support
Support
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  • Spare parts
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