Lauritz Knudsen FN SDF (Switch Disconnector Fuse) 250A | TPN | Open Execution SS Encl DIN Type | In Sheet Steel Enclosure | 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 | TPN | Open Execution SS Encl DIN Type | In Sheet Steel Enclosure | 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, TPN, 415V AC Open Execution Switch Disconnector Fuse (SS Enclosure, DIN Type, 50/60 Hz) is a high-capacity & heavy-duty electrical device that integrates switch disconnection & DIN fuse-based protection into a single robust unit for three-phase systems. Housed in a stainless steel (SS) enclosure, this equipment is specifically engineered to perform reliably in harsh & corrosive environments such as outdoor panels, chemical industries, & high-moisture areas.
Its open execution design ensures easy installation within switchgear panels & provides convenient access for wiring, inspection, & fuse replacement. Built using premium-grade materials & advanced engineering standards, this switch disconnector fuse offers dependable switching along with efficient protection against overloads & short circuit conditions, ensuring long-term safety & operational reliability in industrial applications.
Purpose & Function
This switch disconnector fuse is designed for combined switching & circuit protection:
• Ensures safe disconnection of three-phase electrical circuits
• 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, SS Enclosure)
• Rated current: 250A
• Rated voltage: 415V AC
• Poles: TPN (Triple Pole + Neutral)
• Frequency: 50/60 Hz
• Function: Switching, isolation, & fuse protection
Construction & Design
Engineered for durability in demanding industrial conditions:
• Stainless steel (SS) enclosure for superior corrosion resistance
• High-quality insulating materials for enhanced electrical safety
• DIN type fuse mounting for standardized compatibility
• Integrated fuse system for reliable protection & switching
• Open execution design for easy installation & accessibility
• Heavy-duty & long-lasting construction
Safety & Protection
• Provides protection against overload & short circuit conditions
• Ensures safe circuit isolation during maintenance
• SS enclosure enhances protection in harsh environments
• Minimizes risk of electrical hazards & system failures
• Protects connected equipment & wiring
Mounting & Installation
• Designed for panel & DIN system compatibility
• Suitable for indoor & outdoor installations
• Open execution allows easy wiring & fuse replacement
• Ensures secure & stable mounting
• Simplifies maintenance & servicing
Application Domains
• Industrial electrical panels
• Outdoor & corrosive environment installations
• Chemical & process industries
• Infrastructure & utility systems
• Switchgear & distribution panels
• Moisture, dust, & harsh environments
Key Features
• Rated 250A, 415V AC, TPN configuration
• Switch disconnector with DIN type fuse protection
• Stainless steel (SS) enclosure for corrosion resistance
• Open execution design for easy operation
• Heavy-duty industrial-grade construction
Applications
• Combined switching & circuit protection
• Industrial & outdoor electrical systems
• Switchgear & distribution panels
• Machinery protection & isolation
• Electrical safety in harsh environments
FAQs
1. What is a switch disconnector fuse (SDF)?
Ans: It is a device that combines switching, isolation, & fuse-based protection in one unit.
2. What is an SS enclosure?
Ans: An SS (stainless steel) enclosure provides protection against corrosion, moisture, & harsh environmental conditions.
3. What is TPN configuration?
Ans: TPN stands for Triple Pole + Neutral, used for three-phase electrical systems.
4. What is the current rating?
Ans: It is rated for 250A applications.
5. What is the voltage rating?
Ans: The device supports systems up to 415V AC.
6. Where is this device used?
Ans: It is used in industrial plants, outdoor panels, & corrosion-prone environments.
7. Does it provide both protection & switching?
Ans: Yes, it offers reliable switching along with integrated fuse-based circuit protection.
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 | SS enclosure |
| No. of Poles | TPN |
| 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, TPN, 415V AC Open Execution Switch Disconnector Fuse (SS Enclosure, DIN Type, 50/60 Hz) is a high-capacity & heavy-duty electrical device that integrates switch disconnection & DIN fuse-based protection into a single robust unit for three-phase systems. Housed in a stainless steel (SS) enclosure, this equipment is specifically engineered to perform reliably in harsh & corrosive environments such as outdoor panels, chemical industries, & high-moisture areas.
Its open execution design ensures easy installation within switchgear panels & provides convenient access for wiring, inspection, & fuse replacement. Built using premium-grade materials & advanced engineering standards, this switch disconnector fuse offers dependable switching along with efficient protection against overloads & short circuit conditions, ensuring long-term safety & operational reliability in industrial applications.
Purpose & Function
This switch disconnector fuse is designed for combined switching & circuit protection:
• Ensures safe disconnection of three-phase electrical circuits
• 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, SS Enclosure)
• Rated current: 250A
• Rated voltage: 415V AC
• Poles: TPN (Triple Pole + Neutral)
• Frequency: 50/60 Hz
• Function: Switching, isolation, & fuse protection
Construction & Design
Engineered for durability in demanding industrial conditions:
• Stainless steel (SS) enclosure for superior corrosion resistance
• High-quality insulating materials for enhanced electrical safety
• DIN type fuse mounting for standardized compatibility
• Integrated fuse system for reliable protection & switching
• Open execution design for easy installation & accessibility
• Heavy-duty & long-lasting construction
Safety & Protection
• Provides protection against overload & short circuit conditions
• Ensures safe circuit isolation during maintenance
• SS enclosure enhances protection in harsh environments
• Minimizes risk of electrical hazards & system failures
• Protects connected equipment & wiring
Mounting & Installation
• Designed for panel & DIN system compatibility
• Suitable for indoor & outdoor installations
• Open execution allows easy wiring & fuse replacement
• Ensures secure & stable mounting
• Simplifies maintenance & servicing
Application Domains
• Industrial electrical panels
• Outdoor & corrosive environment installations
• Chemical & process industries
• Infrastructure & utility systems
• Switchgear & distribution panels
• Moisture, dust, & harsh environments
Key Features
• Rated 250A, 415V AC, TPN configuration
• Switch disconnector with DIN type fuse protection
• Stainless steel (SS) enclosure for corrosion resistance
• Open execution design for easy operation
• Heavy-duty industrial-grade construction
Applications
• Combined switching & circuit protection
• Industrial & outdoor electrical systems
• Switchgear & distribution panels
• Machinery protection & isolation
• Electrical safety in harsh environments
FAQs
1. What is a switch disconnector fuse (SDF)?
Ans: It is a device that combines switching, isolation, & fuse-based protection in one unit.
2. What is an SS enclosure?
Ans: An SS (stainless steel) enclosure provides protection against corrosion, moisture, & harsh environmental conditions.
3. What is TPN configuration?
Ans: TPN stands for Triple Pole + Neutral, used for three-phase electrical systems.
4. What is the current rating?
Ans: It is rated for 250A applications.
5. What is the voltage rating?
Ans: The device supports systems up to 415V AC.
6. Where is this device used?
Ans: It is used in industrial plants, outdoor panels, & corrosion-prone environments.
7. Does it provide both protection & switching?
Ans: Yes, it offers reliable switching along with integrated fuse-based circuit protection.
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 | SS enclosure |
| No. of Poles | TPN |
| 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.