Authorized Littelfuse Distributor
Littelfuse L15S040 - The L15S series is a traditional North American Bolted style high-speed fuse for protection of power semiconductor devices that are rated up to 150 V ac and up to 150 V dc Littelfuse POWR-SPEED ® products offer optimized circuit protection at the extremely fast speed required to protect power semiconductor devices such as silicon controlled rectifiers (SCR’s), diodes, thyristors, triacs, transistors, and similar solid-state devices. These devices are used in power equipment including variable speed drives, power rectifiers, UPS systems, dc power supplies, and in a wide range of electronic equipment. May be used wherever extremely fastacting, current-limiting fuses with no time delay are required.

Littelfuse L15S040 The L15S series is a traditional North American Bolted style high-speed fuse for…

Alternate Item Number: L15S040.T

UPC: 079458002348


Documents & Media
BrochureTechnical BulletinTechnical Drawing3D CAD Model (STEP)Specification SheetVideo Clip

Contact for Pricing

Call +1 (262) 252-1600 (toll-free 877-268-3700) or email [email protected] for pricing and availability.

Overview

The Littelfuse L15S040 is a high-speed, current-limiting fuse from the L15S series, designed for protecting power semiconductor devices rated up to 150V AC and 150V DC. This traditional North American bolted-style fuse delivers ultra-fast response times to safeguard sensitive solid-state components such as silicon-controlled rectifiers (SCRs), diodes, thyristors, triacs, and transistors. Its bolted mounting design ensures secure installation in critical power equipment, including variable speed drives, power rectifiers, UPS systems, DC power supplies, and other electronic devices requiring instantaneous overcurrent protection. Key specifications include a voltage rating of 150V AC/DC, an ampere range of 1–1000A, and an interrupting rating of 100kA AC and 20kA DC. The fuse features a melamine body and silver-plated copper alloy caps, with a time constant of 10ms. It operates reliably across a wide temperature range from -55°C to +125°C and is RoHS compliant. The L15S040 is available in a bolted tags mounting type for 70–1000A applications, ensuring robust and secure connections in high-performance power electronics. Ideal for power converters, industrial heaters, battery chargers, and soft starters, this fuse provides immediate interruption during fault conditions to prevent catastrophic damage to semiconductor components. Its fast-acting characteristics enhance system reliability and longevity by minimizing downtime and reducing the risk of component failure in critical applications.
  • Voltage rating: 150V AC/DC
  • Ampere range: 1–1000A (L15S040 rated at 40A)
  • Interrupting rating: 100kA AC, 20kA DC
  • Mounting type: Bolted tags (70–1000A)
  • Operating temperature: -55°C to +125°C

Specifications

Application
Semiconducting Devices
Brand Name
Littelfuse
Connection Type
Bolted
Connection Type
Bolted Style
Mounting Type
Bolted
Mounting Type
Bolted Style
Series
L15S
Special Features
Very Fast Acting
Standard
CSA Certified
Sub Brand
L15S Series
Type
Semiconductor Fuses
Voltage Rating
150 V AC/DC
Package Weight (Imperial)
0.097 L
Package Weight (Metric)
0.044 kg
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 Block 600VAC 600VDC Class CC 30A 3-Pole Pressure Plate with Reinforced Clip

30323R

Fuse Block 600VAC 600VDC Class CC 30A 3-Pole Pressure Plate with Reinforced Clip
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 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 are the voltage and current ratings for 10 x 38 mm fuses?

10 x 38 mm fuses are available with 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 rated up to 1500 Vdc for various current applications.

What UL standard does the Industrial Shock-Block GFCI meet?

The Industrial Shock-Block GFCI meets UL Standard 943C Class C and Class D for people protection in industrial facilities.

Do pre-engineered fusible switches and panels meet NEC requirements?

Littelfuse pre-engineered fusible switches and panels are UL Listed and designed to meet NEC® coordination requirements.

How can I get technical support for Littelfuse products?

You can contact Littelfuse Techline experts by phone at +1-800-TEC-FUSE (800-832-3873) or email [email protected] for fuse and relay product questions.

Where can I find training courses on Littelfuse products?

Littelfuse University (LFU) offers in-depth training courses and quick references about products, programs, and tools. Visit LittelfuseUniversity.com to register.

What are the benefits of the Littelfuse MROplus™ program?

The MROplus™ program helps manufacturing facilities lower costs, increase plant safety, decrease downtime, and reduce inventory.

How does the Littelfuse Stock Check Program work?

The Stock Check Program allows distributors to display their inventory levels on Littelfuse.com, driving new customers to their websites.

What services are available through the Littelfuse Business Center?

The Littelfuse Business Center allows users to check product availability, pricing, place orders, view order status, and manage Special Pricing Agreements.

What is the function of Littelfuse arc-flash protection relays?

Littelfuse arc-flash relays detect developing arc-flash incidents and send a trip signal to interrupt power, preventing significant damage.

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.