Lauritz Knudsen Thermal Overload Relay, MN 12L, 415V AC | Relay Range 135-570A | Class 10A | Manual & auto reset mode| Built-in Single Phasing protection
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Lauritz Knudsen Thermal Overload Relay, MN 12L, 415V AC | Relay Range 135-570A | Class 10A | Manual & auto reset mode| Built-in Single Phasing protection
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Description
About the Product
Lauritz Knudsen compatible MN-12L Thermal Overload Relay 135–225A 415V AC Class 10A is a heavy-duty motor protection device designed to safeguard medium to high-capacity industrial motors from overload conditions. It is widely used in motor starter systems for reliable & safe operation.
How the Mechanism Works
The relay operates using a thermal sensing mechanism that continuously monitors current flow through the motor circuit. When the current exceeds the adjustable range (135–225A) for a defined duration, the internal thermal element heats up & trips, disconnecting the circuit to prevent overheating & motor damage.
Electrical Configuration
Rated for an adjustable current range of 135–225A & 415V AC supply, this relay features Class 10A tripping characteristics, providing faster & more responsive protection during overload conditions. It is typically integrated with heavy-duty contactors in motor control panels.
• Safety / protection aspects
• The relay provides reliable protection against prolonged overload conditions, helping prevent motor winding damage, excessive heating, & system failures. It enhances safety, reduces downtime, & improves the longevity of connected equipment.
Construction & Design
A compact control module combines sensing or coil elements, switching contacts, adjustment or indication features, & accessible terminals.
Safety & Protection
Use within the stated ratings & coordinate the control circuit with suitable isolation & overcurrent protection before installation or service.
Mounting & Durability
Designed for seamless integration with compatible contactors, the relay supports panel mounting in industrial environments. The rugged construction ensures durability & consistent performance under high-load operations.
Application Domains
Suitable for medium to high-load industrial applications such as pumps, compressors, conveyors, heavy machinery, & automation systems requiring reliable motor protection.
Key Features
• Adjustable current range: 135–225A
• Rated for 415V AC operation
• Class 10A tripping characteristic for faster overload response
• Thermal overload sensing mechanism
• Compatible with heavy-duty motor starters & contactors
• Durable construction for industrial environments
Applications
• High-capacity motor starter panels
• Industrial pumps & compressors
• Conveyor systems
• Heavy machinery & production systems
• Industrial automation setups
FAQs
1. What is a thermal overload relay used for?
Ans: It is used to protect motors by disconnecting the circuit when excessive current is detected.
2. What does Class 10A mean?
Ans: Class 10A provides faster tripping response compared to Class 10, offering improved protection for high-load motors.
3. What is the current range of this relay?
Ans: It operates within an adjustable range of 135–225A.
4. Is this compatible with contactors?
Ans: Yes, it is designed for use with heavy-duty contactors in motor starter systems.
5. What voltage does it support?
Ans: It is rated for 415V AC systems.
6. Where can it be used?
Ans: It is suitable for medium to high-capacity motor protection in industrial & commercial applications.
Overview
| Ambient temperature | -5 to 55 Degree C |
|---|---|
| Mounting | Separate |
| Rated operational current at 415V | 2A |
| Rated Insulation Voltage Ui (V) | 690V |
| Built-in contacts | 2NO + 1NC |
| Start/Off/Reset | 1 Start & 1 OFF/Reset |
| Trip Class | 30A |
| Rated impulse withstand voltage (Uimp) | 6kV |
| Conformance to Standards | IS/IEC 60947-4-1, IEC 60947-4-1 |
| Mechanical Life (No. of operating cycles) | 30 Operations/Hr |
| Discount Percentage | Between 0-10 % |
Reviews
Description
About the Product
Lauritz Knudsen compatible MN-12L Thermal Overload Relay 135–225A 415V AC Class 10A is a heavy-duty motor protection device designed to safeguard medium to high-capacity industrial motors from overload conditions. It is widely used in motor starter systems for reliable & safe operation.
How the Mechanism Works
The relay operates using a thermal sensing mechanism that continuously monitors current flow through the motor circuit. When the current exceeds the adjustable range (135–225A) for a defined duration, the internal thermal element heats up & trips, disconnecting the circuit to prevent overheating & motor damage.
Electrical Configuration
Rated for an adjustable current range of 135–225A & 415V AC supply, this relay features Class 10A tripping characteristics, providing faster & more responsive protection during overload conditions. It is typically integrated with heavy-duty contactors in motor control panels.
• Safety / protection aspects
• The relay provides reliable protection against prolonged overload conditions, helping prevent motor winding damage, excessive heating, & system failures. It enhances safety, reduces downtime, & improves the longevity of connected equipment.
Construction & Design
A compact control module combines sensing or coil elements, switching contacts, adjustment or indication features, & accessible terminals.
Safety & Protection
Use within the stated ratings & coordinate the control circuit with suitable isolation & overcurrent protection before installation or service.
Mounting & Durability
Designed for seamless integration with compatible contactors, the relay supports panel mounting in industrial environments. The rugged construction ensures durability & consistent performance under high-load operations.
Application Domains
Suitable for medium to high-load industrial applications such as pumps, compressors, conveyors, heavy machinery, & automation systems requiring reliable motor protection.
Key Features
• Adjustable current range: 135–225A
• Rated for 415V AC operation
• Class 10A tripping characteristic for faster overload response
• Thermal overload sensing mechanism
• Compatible with heavy-duty motor starters & contactors
• Durable construction for industrial environments
Applications
• High-capacity motor starter panels
• Industrial pumps & compressors
• Conveyor systems
• Heavy machinery & production systems
• Industrial automation setups
FAQs
1. What is a thermal overload relay used for?
Ans: It is used to protect motors by disconnecting the circuit when excessive current is detected.
2. What does Class 10A mean?
Ans: Class 10A provides faster tripping response compared to Class 10, offering improved protection for high-load motors.
3. What is the current range of this relay?
Ans: It operates within an adjustable range of 135–225A.
4. Is this compatible with contactors?
Ans: Yes, it is designed for use with heavy-duty contactors in motor starter systems.
5. What voltage does it support?
Ans: It is rated for 415V AC systems.
6. Where can it be used?
Ans: It is suitable for medium to high-capacity motor protection in industrial & commercial applications.
Overview
| Ambient temperature | -5 to 55 Degree C |
|---|---|
| Mounting | Separate |
| Rated operational current at 415V | 2A |
| Rated Insulation Voltage Ui (V) | 690V |
| Built-in contacts | 2NO + 1NC |
| Start/Off/Reset | 1 Start & 1 OFF/Reset |
| Trip Class | 30A |
| Rated impulse withstand voltage (Uimp) | 6kV |
| Conformance to Standards | IS/IEC 60947-4-1, IEC 60947-4-1 |
| Mechanical Life (No. of operating cycles) | 30 Operations/Hr |
| Discount Percentage | Between 0-10 % |