Lauritz Knudsen FN SDF (Switch Disconnector Fuse) 250A | 4 Pole | Open Execution DIN Type | Suitable for DIN fuse-link | Telescopic shaft for depth adjustment
Images:
Image 360:
How to video:
Further offers for this product
Incl. Tax
In Stock
No sellers found for this product.
Incl. Tax
Lauritz Knudsen FN SDF (Switch Disconnector Fuse) 250A | 4 Pole | Open Execution DIN Type | Suitable for DIN fuse-link | Telescopic shaft for depth adjustment
- Description
- Specifications
- Documents
- Warranty
- Reviews
Description
About the Product
The Lauritz Knudsen FN SDF 250A, 4 Pole, 415V AC Open Execution Switch Disconnector Fuse (DIN Type, 50/60 Hz) is a heavy-duty electrical device that integrates switch disconnection & DIN fuse-based protection into a single robust unit. Its open execution design allows easy installation in switchgear panels & provides convenient access for wiring, inspection, & fuse replacement, while ensuring compatibility with standardized DIN fuse systems.
Manufactured using high-quality materials & advanced engineering practices, this switch disconnector fuse ensures reliable switching performance along with effective protection against overloads & short circuit conditions. It is widely used in switchgear panels, distribution boards, & industrial electrical installations, ensuring safe & efficient operation in three-phase (4P) power systems.
Purpose & Function
This switch disconnector fuse is designed for combined switching & circuit protection:
• Ensures safe disconnection of three-phase electrical circuits including neutral
• Provides integrated DIN fuse-based protection against overload & faults
• Enables complete isolation during maintenance
• Prevents damage to connected equipment due to short circuits
• Supports stable & controlled power distribution
Electrical Configuration
• Product type: Switch Disconnector Fuse (Open Execution, DIN Type)
• Rated current: 250A
• Rated voltage: 415V AC
• Poles: 4 Pole (4P)
• Frequency: 50/60 Hz
• Function: Switching, isolation, & fuse protection
Construction & Design
Engineered for heavy-duty industrial performance:
• High-quality insulating materials for enhanced safety
• DIN type fuse mounting for standardized compatibility
• Integrated fuse system for efficient protection & switching
• Open execution design for easy installation & accessibility
• Robust & long-lasting construction for high-load applications
Safety & Protection
• Provides protection against overload & short circuit conditions
• Ensures safe circuit isolation during maintenance
• Minimizes risk of electrical hazards & system failures
• Protects connected equipment & wiring
• Enhances safety in switchgear & control panel systems
Mounting & Installation
• Designed for panel & DIN system compatibility
• Open execution allows easy wiring & fuse replacement
• Suitable for industrial & commercial installations
• Ensures secure & stable mounting
• Simplifies maintenance & servicing
Application Domains
• Switchgear & control panels
• Three-phase power distribution systems
• Industrial electrical installations
• Commercial electrical systems
• Machinery & equipment protection
• Infrastructure & utility systems
Key Features
• Rated 250A, 415V AC, 4 Pole configuration
• Switch disconnector with DIN type fuse protection
• Standard DIN fuse compatibility
• Open execution design for easy operation
• Heavy-duty industrial-grade construction
Applications
• Combined switching & circuit protection
• Switchgear & distribution systems
• Industrial & commercial installations
• Machinery protection & isolation
• Electrical safety & power management
FAQs
1. What is a 4P switch disconnector fuse?
Ans: A 4 Pole device isolates all three phases & the neutral simultaneously for complete circuit safety.
2. What does 250A rating mean?
Ans: It indicates the device can safely carry up to 250 amperes of current.
3. What does DIN type fuse mean?
Ans: It refers to a standardized fuse design used for compatibility & easy replacement.
4. What is the voltage rating?
Ans: The unit is rated for 415V AC systems.
5. Where is this device used?
Ans: It is used in switchgear panels, distribution systems, & industrial installations.
6. Does it provide both protection & switching?
Ans: Yes, it combines reliable switching with fuse-based circuit protection.
7. Why use a 4P configuration?
Ans: It ensures complete isolation including the neutral line, enhancing safety in three-phase systems.
Overview
| Rated Operational Current (A) | 250A |
|---|---|
| Conformance to Standards | IS/IEC 60947-3, EN 60947-3 |
| Fuse Type | DIN /Knife-edge |
| Utilization Category | AC-23A |
| Rated operational voltage (Ue) | 415V |
| Operating Frequency(Hz) | 50/60 |
| Mechanical Life (No. of operating cycles) | 10000 |
| Rated Insulation Voltage Ui (V) | 690V |
| Rated Breaking Capacity@AC-23A (A) | 2000 |
| Rated Making Capacity@AC-23A (A) | 2500 |
| Version | Open Execution |
| No. of Poles | 4P |
| Maximum Al termination (sq.mm) | 240 |
| Mounting positions | All Orientations |
| Standard Accessories | Terminal Shrouds, Phase Barriers, Extended handle with shaft |
| Pollution Degree | 3 |
| Discount Percentage | Between 0-10 % |
Warranty
- All products listed in the price list are covered by a warranty against manufacturing defects for a period of 18* months from the date of purchase.
- For Lauritz Knudsen MCBs & Isolators mounted inside Lauritz Knudsen Distribution Boards, an extended warranty of 5 years is provided.
- In the event of a defect due to faulty workmanship or other associated reasons, the manufacturer will, at its discretion, remedy the defect or replace the faulty parts or the entire product as soon as possible, free of cost.
- This warranty is subject to proper usage and efficient maintenance and does not cover defects arising from fire, accidents, inefficient maintenance, faulty operation, or deliberate or accidental damage.
- The warranty does not cover damage to power electronic components such as thyristors & IGBTs, which primarily fail due to over-temperature or over-voltage. Users must take adequate precautions to eliminate such conditions.
- The manufacturer shall not be responsible or liable for any special, incidental, social, or consequential losses (including loss of profits), punitive damages, injury, or damages of any kind solely attributable to defect or failure of its products.
- The manufacturer shall not be liable in any manner for issues related to or failure in the performance of any other equipment to which the product is connected.
Reviews
Description
About the Product
The Lauritz Knudsen FN SDF 250A, 4 Pole, 415V AC Open Execution Switch Disconnector Fuse (DIN Type, 50/60 Hz) is a heavy-duty electrical device that integrates switch disconnection & DIN fuse-based protection into a single robust unit. Its open execution design allows easy installation in switchgear panels & provides convenient access for wiring, inspection, & fuse replacement, while ensuring compatibility with standardized DIN fuse systems.
Manufactured using high-quality materials & advanced engineering practices, this switch disconnector fuse ensures reliable switching performance along with effective protection against overloads & short circuit conditions. It is widely used in switchgear panels, distribution boards, & industrial electrical installations, ensuring safe & efficient operation in three-phase (4P) power systems.
Purpose & Function
This switch disconnector fuse is designed for combined switching & circuit protection:
• Ensures safe disconnection of three-phase electrical circuits including neutral
• Provides integrated DIN fuse-based protection against overload & faults
• Enables complete isolation during maintenance
• Prevents damage to connected equipment due to short circuits
• Supports stable & controlled power distribution
Electrical Configuration
• Product type: Switch Disconnector Fuse (Open Execution, DIN Type)
• Rated current: 250A
• Rated voltage: 415V AC
• Poles: 4 Pole (4P)
• Frequency: 50/60 Hz
• Function: Switching, isolation, & fuse protection
Construction & Design
Engineered for heavy-duty industrial performance:
• High-quality insulating materials for enhanced safety
• DIN type fuse mounting for standardized compatibility
• Integrated fuse system for efficient protection & switching
• Open execution design for easy installation & accessibility
• Robust & long-lasting construction for high-load applications
Safety & Protection
• Provides protection against overload & short circuit conditions
• Ensures safe circuit isolation during maintenance
• Minimizes risk of electrical hazards & system failures
• Protects connected equipment & wiring
• Enhances safety in switchgear & control panel systems
Mounting & Installation
• Designed for panel & DIN system compatibility
• Open execution allows easy wiring & fuse replacement
• Suitable for industrial & commercial installations
• Ensures secure & stable mounting
• Simplifies maintenance & servicing
Application Domains
• Switchgear & control panels
• Three-phase power distribution systems
• Industrial electrical installations
• Commercial electrical systems
• Machinery & equipment protection
• Infrastructure & utility systems
Key Features
• Rated 250A, 415V AC, 4 Pole configuration
• Switch disconnector with DIN type fuse protection
• Standard DIN fuse compatibility
• Open execution design for easy operation
• Heavy-duty industrial-grade construction
Applications
• Combined switching & circuit protection
• Switchgear & distribution systems
• Industrial & commercial installations
• Machinery protection & isolation
• Electrical safety & power management
FAQs
1. What is a 4P switch disconnector fuse?
Ans: A 4 Pole device isolates all three phases & the neutral simultaneously for complete circuit safety.
2. What does 250A rating mean?
Ans: It indicates the device can safely carry up to 250 amperes of current.
3. What does DIN type fuse mean?
Ans: It refers to a standardized fuse design used for compatibility & easy replacement.
4. What is the voltage rating?
Ans: The unit is rated for 415V AC systems.
5. Where is this device used?
Ans: It is used in switchgear panels, distribution systems, & industrial installations.
6. Does it provide both protection & switching?
Ans: Yes, it combines reliable switching with fuse-based circuit protection.
7. Why use a 4P configuration?
Ans: It ensures complete isolation including the neutral line, enhancing safety in three-phase systems.
Overview
| Rated Operational Current (A) | 250A |
|---|---|
| Conformance to Standards | IS/IEC 60947-3, EN 60947-3 |
| Fuse Type | DIN /Knife-edge |
| Utilization Category | AC-23A |
| Rated operational voltage (Ue) | 415V |
| Operating Frequency(Hz) | 50/60 |
| Mechanical Life (No. of operating cycles) | 10000 |
| Rated Insulation Voltage Ui (V) | 690V |
| Rated Breaking Capacity@AC-23A (A) | 2000 |
| Rated Making Capacity@AC-23A (A) | 2500 |
| Version | Open Execution |
| No. of Poles | 4P |
| Maximum Al termination (sq.mm) | 240 |
| Mounting positions | All Orientations |
| Standard Accessories | Terminal Shrouds, Phase Barriers, Extended handle with shaft |
| Pollution Degree | 3 |
| Discount Percentage | Between 0-10 % |
Warranty
- All products listed in the price list are covered by a warranty against manufacturing defects for a period of 18* months from the date of purchase.
- For Lauritz Knudsen MCBs & Isolators mounted inside Lauritz Knudsen Distribution Boards, an extended warranty of 5 years is provided.
- In the event of a defect due to faulty workmanship or other associated reasons, the manufacturer will, at its discretion, remedy the defect or replace the faulty parts or the entire product as soon as possible, free of cost.
- This warranty is subject to proper usage and efficient maintenance and does not cover defects arising from fire, accidents, inefficient maintenance, faulty operation, or deliberate or accidental damage.
- The warranty does not cover damage to power electronic components such as thyristors & IGBTs, which primarily fail due to over-temperature or over-voltage. Users must take adequate precautions to eliminate such conditions.
- The manufacturer shall not be responsible or liable for any special, incidental, social, or consequential losses (including loss of profits), punitive damages, injury, or damages of any kind solely attributable to defect or failure of its products.
- The manufacturer shall not be liable in any manner for issues related to or failure in the performance of any other equipment to which the product is connected.