Littelfuse TLS020LB - TLS020LB is a Telecommunications fuse with an ampere rating of 20.
Littelfuse

TLS020LB

Alternate Item Number: 0TLS020.TXLB

UPC: 079458061765


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Minimum Qty: 500

Multiplier: 500

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Overview

The **Littelfuse TLS020LB 20A Telecommunications Fuse** is a high-performance, UL-listed fuse designed to deliver robust overcurrent protection for critical telecom applications. Engineered by Littelfuse, a global leader in circuit protection solutions, this fuse is specifically formulated to safeguard sensitive telecommunications equipment from damaging fault currents while ensuring uninterrupted service in mission-critical environments. Telecommunications networks demand components that meet the highest standards of reliability, speed, and durability. The TLS020LB is purpose-built for these exacting requirements, offering a 20-ampere rating that aligns with common telecom power distribution needs. Its compact, blade-style design—compatible with standard fuse holders—makes it ideal for installation in data centers, central offices, base stations, and network interface devices. Whether protecting DSL lines, fiber optic equipment, or POTS (Plain Old Telephone Service) infrastructure, this fuse provides fast-acting response to overcurrent events, minimizing downtime and equipment damage. **Key Features and Benefits:** - **Fast-Acting Performance:** The TLS020LB is engineered for rapid response to overcurrent conditions, reducing the risk of thermal damage to downstream components and maintaining signal integrity in high-speed data networks. - **Compliance and Safety:** Fully compliant with UL 248-14 and other global telecom standards, this fuse meets the rigorous safety and performance requirements of telecom infrastructure, including NEBS (Network Equipment-Building System) guidelines for equipment deployed in central offices and outdoor cabinets. - **Compact and Reliable Design:** With a low-profile, blade-style construction, the TLS020LB fits seamlessly into tight spaces within telecom enclosures, distribution panels, and patch panels. Its robust housing resists vibration and environmental stress, ensuring long-term reliability in both indoor and outdoor installations. - **Wide Application Compatibility:** Suitable for protecting power feeds to DSLAMs, ONTs (Optical Network Terminals), routers, switches, and other active network equipment, the TLS020LB supports a broad range of telecom applications from enterprise networks to carrier-grade infrastructure. - **Trusted Manufacturer Reliability:** Littelfuse is a recognized authority in circuit protection, with over a century of innovation in fuse technology. The company’s telecom fuses are trusted by service providers, equipment manufacturers, and installers worldwide for their consistent performance and adherence to industry standards. **Industry Applications:** The TLS020LB is widely deployed across the telecommunications sector, including: - **Central Office Equipment:** Protecting power distribution units and line cards in legacy and next-generation switching systems. - **Data Centers:** Safeguarding power supplies to servers, storage systems, and network switches that support cloud and edge computing services. - **Wireless Infrastructure:** Ensuring reliable operation of base station power feeds, remote radio heads, and small cell deployments. - **Fiber-to-the-Home (FTTH) Networks:** Providing overcurrent protection for optical network terminals and distribution points in residential and business fiber deployments. - **Enterprise Networking:** Supporting the protection of VoIP systems, PBX units, and unified communications platforms. **Installation and Selection Considerations:** When selecting a fuse for telecom applications, professionals prioritize factors such as interrupting rating, response time, and environmental durability. The TLS020LB offers a high interrupting rating suitable for telecom environments, ensuring it can safely interrupt fault currents without damage. Its fast-acting characteristic is particularly valuable in protecting sensitive semiconductors and integrated circuits common in modern telecom gear. For optimal performance, install the fuse in a properly rated fuse holder or panel, ensuring correct polarity and secure contact to prevent nuisance tripping or poor performance. Littelfuse’s global manufacturing footprint and commitment to quality assurance further enhance the value of the TLS020LB. Each fuse undergoes rigorous testing to ensure consistency and reliability, giving network operators and equipment manufacturers confidence in their long-term performance. Whether upgrading existing infrastructure or deploying new systems, the TLS020LB provides a dependable, cost-effective solution for circuit protection in the telecom industry.
  • 20A ampere rating for telecom power distribution
  • Fast-acting response to overcurrent conditions
  • UL 248-14 and NEBS compliant for telecom applications
  • Compact blade-style design for easy installation
  • Trusted Littelfuse quality for mission-critical networks

Specifications

Application
Telecommunications
Brand Name
Littelfuse
Color
Blue
Connection Type
Blade-style
Current Rating
20 A
Material
Poly
Mounting Type
Fuse holder
Mounting Type
Fuse holder compatible
Series
TLS
Size
Blade-style
Special Features
Multiple mounting configurations
Sub Brand
TLS Series
Type
Current Limiting
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 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.