Littelfuse LDC250 - Littelfuse POWR-PRO® LDC series Class L fuses represent another first in fuse protection. LDC series fuses are the first UL Listed 600 volts AC and DC Class L fuse. Since they may be used for both AC and DC, they eliminate the concern that AC only fuses may be inserted into DC circuits. While LDC series fuses’ UL Listed DC interrupting rating is more than adequate for most applications (50,000 amperes at a 16 millisecond time constant), tests in our high power testing laboratory have shown that this remarkable fuse is capable of performing at much longer time constants. This makes the fuse uniquely suited for such applications as crane rail circuits and mass transit systems. Contact the factory for application information for special needs such as this. For AC-only systems, consider the use of POWR-PRO® KLPC series fuses. They have a full ten seconds time-delay at 500% rated current, and have a wider range of ratings.
Littelfuse

LDC250

Alternate Item Number: 0LDC250.X

UPC: 079458002553


Documents & Media
BrochureTechnical BulletinTechnical DrawingSpecification Sheet

Contact for Pricing

Overview

The Littelfuse POWR-PRO® LDC250 (SKU: LDC250) is a groundbreaking Class L fuse, uniquely recognized as the first UL Listed 600 volts AC and DC Class L fuse. This innovation directly addresses the critical safety concern of AC-only fuses being inadvertently installed into DC circuits, ensuring universal application compatibility and enhanced operational safety. The LDC250 is engineered with a robust UL Listed DC interrupting rating of 50,000 amperes at a 16 millisecond time constant, providing ample protection for the majority of industrial applications. Further extensive testing in Littelfuse's high-power laboratory has demonstrated the LDC250's remarkable ability to perform effectively at significantly longer time constants. This extended performance capability makes the LDC250 an ideal choice for specialized and demanding applications, including crane rail circuits and mass transit systems. For these specific, high-demand scenarios, Littelfuse recommends direct contact with the factory for detailed application information and tailored solutions. For AC-only systems where a different protection profile is desired, the Littelfuse POWR-PRO® KLPC series fuses are available. The KLPC series offers a minimum of ten seconds of time-delay at 500% rated current and a broader range of available ratings, providing a distinct alternative for specific AC system needs. Trust the Littelfuse LDC250 for unparalleled safety, reliability, and versatility in your critical electrical infrastructure. Its Class L designation signifies its suitability for high-amperage industrial circuits.
  • First UL Listed 600V AC and DC Class L fuse
  • Eliminates risk of AC-only fuse insertion into DC circuits
  • UL Listed DC interrupting rating of 50,000A at 16ms
  • Capable of performing at longer time constants
  • Suitable for crane rail circuits and mass transit systems

Specifications

Amperage Rating
250 Amps
Application
Inverters/UPS/DC distribution
Brand Name
Littelfuse
Current Rating
250 A
Interrupting Rating
50,000 A at 16 ms time constant (DC)
Series
LDC
Special Features
Current-limiting
Standard
UL Listed/ CSA Certified
Sub Brand
POWR-PRO
Type
Fast-Acting
Voltage Rating
600 V AC/DC
Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount

GPM-SRR90

Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount
Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20

C331156

Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20
Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8

1SCM8

Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8
Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

E1062696

Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20
POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.

LCC5

POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.
9F61 Size B Clips 1.6in

9F61BWW460

9F61 Size B Clips 1.6in

Frequently Asked Questions

What types of fuses does Littelfuse offer?

Littelfuse offers UL Class, high-speed, medium voltage, 10x38 mm, and solar fuses for various protection needs.

What voltage ranges do 10x38 mm fuses support?

10x38 mm fuses have ratings from 125 to 1000 volts and 1/10 to 30 amperes.

What is the maximum voltage for Littelfuse solar fuses?

Littelfuse offers solar fuses and holders up to 1500 Vdc for both high-current and low-current applications.

Do Littelfuse fuse blocks support DIN-rail mounting?

Yes, Littelfuse fuse blocks and holders are selected for their compact designs, indication feature, and flexibility of DIN-rail mounting.

What is the Industrial Shock-Block® GFCI?

It is a permanently connected special-purpose GFCI meeting UL Standard 943C Class C and D, designed for people protection in industrial facilities.

How do arc-flash protection relays work?

Arc-flash relays detect a developing arc-flash incident and send a trip signal to interrupt power before significant damage occurs.

What do trailing-cable protection relays monitor?

They continuously monitor the integrity of the ground conductor in portable cables to protect equipment from hazardous voltages caused by ground faults.

Where can I find technical support for Littelfuse products?

Technical experts at Littelfuse Techline can answer questions regarding fuse and relay products. Contact them at +1-800-TEC-FUSE or [email protected].

How can I check product availability and pricing?

You can access the Littelfuse Business Center website to look up product availability, pricing, place orders, and check order status.

Does Littelfuse offer training for its products?

Yes, Littelfuse University (LFU) offers in-depth training courses and quick references to learn about products, programs, and tools.

Frequently Asked Questions about Littelfuse

What certifications and standards do Littelfuse products comply with?

Littelfuse products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Customers can verify specific product certifications by consulting individual product datasheets on Littelfuse.com, which provide comprehensive details about standards compliance for each component.

What industries and applications are Littelfuse products used for?

Littelfuse products are critical for electrical protection and safety across multiple industrial sectors, including manufacturing, automation, power distribution, and electrical control systems. Their comprehensive product portfolio serves industries that require robust electrical protection, including motor and pump applications, solar installations, programmable logic controllers (PLCs), electrical switch panels, and critical infrastructure environments. Key product lines protect against overcurrent, voltage transients, ground faults, and temperature-related electrical risks, ensuring equipment safety and operational reliability.

What technical support does Littelfuse offer?

Littelfuse offers comprehensive technical support through multiple channels. Their Technical Hotline (800-TEC-FUSE) provides direct access to engineers who can help identify issues and recommend solutions. Additionally, Littelfuse offers extensive online Technical Resources at Littelfuse.com, including datasheets, product manuals, whitepapers, application guides, and online design tools. Their experienced product and application engineers also provide step-by-step support from design to installation.

What are the main product lines offered by Littelfuse?

Littelfuse offers comprehensive industrial protection and control product lines, including fuses, fuse holders, protection relays, temperature sensors, and electrical safety components. Their key product categories span surge protective devices, custom OEM products, electrical switch panels, medium voltage fuses, ground-fault protection relays, motor and pump protection devices, and temperature sensors. These products are designed to minimize electrical safety hazards, limit equipment damage, improve productivity, and safeguard personnel from electrical faults.

What are the key features of Littelfuse products?

Littelfuse products feature exceptional circuit protection technologies with key characteristics including UL/IEC safety standard compliance, low internal resistance, and advanced protective capabilities across multiple product lines. Their components provide critical protection for industrial systems, offering features like overcurrent protection, voltage transient suppression, and resettable protection devices with ultra-low resistance and compact designs. Key product lines include fuses, metal oxide varistors (MOVs), TVS diodes, PolySwitch devices, and specialized electronic protection components that enhance system reliability and safety.

What environmental ratings do Littelfuse products have?

Littelfuse products feature comprehensive environmental ratings, including NEMA Type 1, 2, 3, 3R, 4/4X, 12, and 13 certifications, as well as IP65 protection. These ratings ensure superior protection in diverse industrial environments, with an operating temperature range of -40°F to +131°F (-40°C to +55°C). Many products also include UV-stabilized materials and neoprene gaskets for enhanced durability in outdoor and challenging conditions.

What accessories are available for Littelfuse products?

Littelfuse offers several key accessories across their product lines, including fuse holders, voltage monitoring modules, and terminal connectors. Specific accessories include the LPSM003ZXID (indicating) and LPSM003Z (non-indicating) POWR-SAFE Dead Front fuse holders for Class CC and Midget-Style fuses, the VRM6048 voltage monitor accessory module, and female quick connect terminals (P1015 series) in various wire gauge sizes. These accessories are designed to enhance protection, monitoring, and connectivity for Littelfuse electrical components.

What is Littelfuse's warranty policy?

Littelfuse provides comprehensive warranty details on their official website at www.littelfuse.com/warranty. Customers should visit this page to review the specific warranty terms and conditions for their specific product lines. For direct warranty support or questions, customers can contact Littelfuse Technical Support at 1-800-TEC-FUSE or email [email protected].

What communication protocols do Littelfuse products support?

Littelfuse supports a comprehensive range of industrial communication protocols, including PROFIBUS, PROFINET, EtherNet/IP, DeviceNet, Modbus RTU, and CANopen. Our products provide flexible connectivity solutions across multiple industrial automation platforms, enabling seamless integration with various control systems and network architectures.

How are Littelfuse products typically installed?

Littelfuse products are typically installed using specialized mounting hardware like fuse holders, blocks, and panels designed for specific industrial applications. The POWR-SAFE Dead Front holders, for example, provide optimum protection for Class CC and Midget-Style fuses, supporting installations up to 600 VAC/DC. Installation often involves using precision terminals with strain relief, such as 0.25 in. female quick connect terminals, to ensure secure and safe electrical connections in industrial control systems.