Littelfuse JLLS030.TXV - UL CLASS T FAST ACTING T-PACK 30A. 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

JLLS030.TXV

UPC: 079458062144

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Overview

The **Littelfuse JLLS030.TXV Class T 30A Fast-Acting T-Pack Fuse** delivers unmatched compact protection for industrial and commercial electrical systems. Designed as a space-saving alternative to Class R fuses, this **30-ampere** fuse occupies less than one-third the panel space while maintaining superior performance. Engineered for **non-inductive circuits** and surge-sensitive equipment, the JLLS030.TXV ensures reliable **overload and short-circuit protection** with a **200,000 A.I.R.** rating, making it ideal for high-fault applications. This **ceramic T-Pack fuse** is optimized for **panelboard, meter stack, and series-rated applications**, where compact design and high interrupting capacity are critical. Its **current-limiting design** minimizes equipment damage from short circuits by rapidly interrupting fault currents before they escalate, extending the lifespan of sensitive components like **variable speed drives, rectifiers, and semiconductor circuits**. Professionals in **manufacturing, utilities, and industrial automation** rely on Littelfuse Class T fuses for their **fast-acting response**, which prevents nuisance tripping while safeguarding critical infrastructure. **Key Applications:** - **Meter stacks and main service protection** – Compact Class T fuses enable efficient use of panel space in utility metering applications. - **Series-rated panelboards** – When paired with compatible circuit breakers, these fuses enhance interrupting ratings up to **200,000 amperes**, ensuring compliance with **NEC** and **UL** standards. - **Surge-sensitive equipment** – Protects **inverters, drives, and rectifiers** from damaging inrush currents and transient faults. - **Industrial control panels** – Ideal for **machine tools, HVAC systems, and automation equipment** where space constraints demand high-performance fusing. - **Renewable energy systems** – Safeguards **solar inverters and battery storage systems** from overcurrent events in compact enclosures. **Why Choose Littelfuse JLLS030.TXV?** - **Unmatched compactness** – Reduces panel footprint by **over 50%** compared to Class R alternatives, freeing up space for additional components. - **Superior current limitation** – Limits fault currents faster than mechanical protective devices, reducing thermal and magnetic stress on wiring and equipment. - **UL Class T compliance** – Meets stringent **UL 248-15** standards for fast-acting fuses, ensuring reliability in critical applications. - **Economical protection** – Current-limiting design often allows the use of lower-cost downstream components without compromising safety. - **Trusted manufacturer** – Littelfuse, a global leader in circuit protection, provides **decades of expertise** in fuse technology, backed by **200,000 A.I.R.** ratings for maximum fault interruption. **Installation & Selection Considerations:** - **Non-inductive circuits** – For inductive loads (e.g., motors), increase fuse ampacity to account for inrush currents; consult **NEC Article 240** for guidance. - **Series-rated systems** – Verify compatibility with panelboard manufacturers’ literature to ensure **UL-listed combinations** for up to **200,000 amperes**. - **Replacement & maintenance** – Designed for **T-Pack fuse blocks**, ensuring easy installation and replacement in existing systems. - **Environmental durability** – Ceramic construction resists moisture, vibration, and thermal stress, making it suitable for **harsh industrial environments**. For engineers, electricians, and facility managers seeking **high-performance, space-efficient fusing solutions**, the **Littelfuse JLLS030.TXV** delivers **compact protection without compromise**. Trusted by industries worldwide, Littelfuse’s Class T fuses provide the **reliability, safety, and efficiency** required in modern electrical systems.
  • 30A Class T fast-acting fuse for non-inductive circuits
  • Space-saving T-Pack design (less than 1/3 the size of Class R fuses)
  • 200,000 A.I.R. rating for high-fault applications
  • Current-limiting design reduces equipment damage from short circuits
  • Ideal for meter stacks, panelboards, and series-rated systems

Specifications

Application
Variable Speed Drives
Brand Name
Littelfuse
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

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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.