Littelfuse JLLS003.TXV - UL CLASS T FAST ACTING T-PACK 3A. Space-saving Class T fuses are the most compact fuses available in ratings above 30 amperes — less than one-third the size of comparable Class R fuses. When rated in accordance with the NEC, Class T fuses provide fast-acting overload and short circuit protection for non-inductive circuits and equipment. Used in inductive circuits, the ampere rating of Class T fuses must be increased to prevent opening on inrush currents. In such instances, Class T fuses may provide only short circuit protection.For motor and general purpose circuits where space is not critical, we recommend POWR-PRO™ JTD_ID Indicator series, LLNRK/LLSRK series, or FLSR_ID Indicator series. Applications: Protection of individual electric services and meters. Main switches containing Class T fuses may be used to provide compact protection for meter stacks. Molded case circuit breaker load centers and panelboards have increased interrupting ratings when “series rated” with Littelfuse Class T fuses. Refer to panelboard manufacturers’ literature for UL Listed combination of fuses and panelboards. Series ratings up to 200,000 amperes are available. Space Saving: Typical three-pole Class T fuse blocks require less than 50percent of the panel area required for Class R fuse blocks. Switch enclosures, fuse pullouts, and other equipment using Class T fuses are often correspondingly more compact. Safety: 200,000 A.I.R. — Reliable interruption of all overcurrents up to 200,000 amperes. Extremely current limiting — Stops damaging short circuit current faster than any mechanical protective device. Fast-Acting — Provides fast-acting overload protection to equipment such as variable speed drives, rectifiers and other equipment containing surge-sensitive components. Longer Equipment Life: Current limiting design greatly reduces damage to equipment caused by heating and magnetic effects of short circuit currents. Economical: Extremely current limiting design often permits use of readily available, less costly equipment. Used as input or output fuses for surge-sensitive components, such as variable speed drives and rectifiers, fast-acting Class T JLLS fuses may prevent opening of expensive semiconductor fuses protecting individual components.
Littelfuse

JLLS003.TXV

UPC: 079458062083

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Overview

Littelfuse JLLS003.TXV (SKU: JLLS003.TXV) is a UL Class T fast-acting fuse for non-inductive circuits. It occupies under one-third the panel space of Class R fuses—three-pole Class T blocks use <50% of the area required by Class R blocks, ideal for compact enclosures. Rated 200,000 A.I.R., it interrupts all overcurrents up to this level, with current-limiting design reducing equipment damage from heat and magnetic stress. The 3A fast-acting fuse protects surge-sensitive components in variable speed drives and rectifiers. In inductive circuits, Class T fuse amp ratings may need adjustment to avoid nuisance tripping, shifting focus to short-circuit protection. UL-listed for series-rated applications up to 200,000A with compatible panelboards per manufacturer specs. Applications include individual electric services, meters, and main switches for meter stacks. Current-limiting capability can prevent operation of costlier semiconductor fuses in sensitive equipment.
  • UL Class T Fast-Acting Fuse
  • 3 Ampere Rating
  • Space-saving design, less than 1/3 size of Class R fuses
  • 200,000 A.I.R. for reliable overcurrent interruption
  • Extremely current-limiting for reduced equipment damage

Specifications

Application
Variable Speed Drives
Brand Name
Littelfuse
Current Rating
3 A
Mounting Type
Fuse Block
Series
JLLS
Size
Less than one-third the size of comparable Class R fuses
Size
Less than one-third the size of Class R fuses
Special Features
Fast-Acting
Standard
248-15 Class T
Sub Brand
POWR-GARD JLLS Series
Type
Class T
Package Dimensions (L x W x H)
3 IN x 1.75 IN x 1.25 IN
Package Dimensions (L x W x H)
7.62 cm x 4.445 cm x 3.175 cm
Package Weight (Imperial)
0.500 L
Package Weight (Metric)
0.227 kg

Similar Products

JLLS003.TXP

Amperage Rating: 3 AMP

Interrupt Rating: 20000A@300VDC

Response Time: Fast-Acting (F)

JLLS003.T

Voltage Rating: 250 V AC/DC

Size: 1/4" x 1-1/4"

Connection Type: Cartridge-style

JLLS001.TXV

Current Rating: 1 A

Size: Compact (less than 1/3 size of Class R)

JLLS002.TXV

JLLS006.TXV

Current Rating: 6 A

Mounting Type: T-Pack

Size: Compact (less than one-third the size of Class R fuses)

JLLS001.TXP

Amperage Rating: 1 AMP

Interrupt Rating: 20000A@300VDC

Response Time: Fast-Acting (F)

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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.