Littelfuse 254101 - 2AG OMNI-BLOCK HOLDER BOARD MOUNT 1 POLE. This low profile Omni-Blok® Fuse Block design is available with a choice of solder type terminals, Q.C. terminals or P.C. board mountable terminals. The PCB design is offered with either tin-plated brass terminals for normal applications or tin-plated beryllium copper terminals for use in caustic environments. These fuse blocks feature individual barriers which reinforce the fuse clips while providing greater protection against clip damage and electrical shock. The unique design permits self-alignment of clips to fuse cap. This, plus a one-piece clip/terminal assures low contact resistance. Multiple units may be broken apart to obtain desired number of units.
Littelfuse

254101

Alternate Item Number: 02540101Z

UPC: 079458013566


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Minimum Qty: 10

Multiplier: 10

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Overview

The Littelfuse 254101 2AG Omni-Blok Fuse Block Holder Board Mount is a compact, low-profile solution engineered for 5×20mm (2AG) fuses in industrial and electronic circuits. This versatile fuse block supports multiple terminal configurations—solder, quick-connect (QC), or printed circuit board (PCB) mountable—allowing engineers to select the optimal connection method for their application. Constructed with tin-plated brass terminals for standard environments or tin-plated beryllium copper terminals for caustic conditions, the 254101 ensures long-term reliability and corrosion resistance. Individual barriers reinforce fuse clips, reducing damage risk and enhancing electrical shock protection. The unique self-aligning clip design ensures precise fuse cap alignment, while the one-piece clip/terminal construction minimizes contact resistance for stable electrical performance. Multiple units can be broken apart to configure the desired number of poles, offering flexibility for custom installations. Ideal for power supplies, industrial controls, automotive systems, and telecommunications equipment, this fuse block delivers durable, low-maintenance circuit protection with a compact footprint. Compatible with 5×20mm fuses, the 254101 is rated for 300V and supports current ratings up to 20A, meeting UNSPSC 39121629 standards. Its low-profile design and reinforced construction make it suitable for high-density PCB layouts and harsh operating environments.
  • 1-pole PCB mount fuse block for 5×20mm (2AG) fuses
  • Supports solder, quick-connect (QC), or PCB mountable terminals
  • Tin-plated brass terminals for standard environments; beryllium copper for caustic conditions
  • Individual barriers reinforce fuse clips, reducing damage and electrical shock risk
  • Self-aligning clip design ensures precise fuse cap alignment and low contact resistance
  • Rated for 300V and up to 20A current; meets UNSPSC 39121629
  • Multiple units can be broken apart to configure desired number of poles

Specifications

Brand Name
Littelfuse
Connection Type
Solder, Quick-Connect (QC), or PCB mount
Material
Tin-Plated Brass or Beryllium Copper
Mounting Type
PCB Mount
Poles
1
Series
OMNI-BLOK
Size
2AG (5×20mm)
Special Features
For 3AG Fuses
Standard
RoHS
Sub Brand
254 Series
Type
Fuse Clips
PC BOARD MOUNT FUSEHOLDER Q.C.. The metric Omni-Blok fuse block, for 5×20mm size fuses, is a low profile design that is available with a choice of solder type terminals, NEMA style QC terminals, or PC board mountable terminals. Each of these designs has tin plated brass terminals. A unique design feature provides self-alignment of the clips to the fuse caps. This feature, plus a one-piece clip/terminal design, assures low contact resistance. An anti-one-piece clip/terminal design, assures low contact resistance. An anti rotation feature is also available on the solder and QC terminal designs.

05200003Z

PC BOARD MOUNT FUSEHOLDER Q.C.. The metric Omni-Blok fuse block, for 5×20mm size fuses, is a low profile design that is available with a choice of solder type terminals, NEMA style QC terminals, or PC board mountable terminals. Each of these designs has tin plated brass terminals. A unique design feature provides self-alignment of the clips to the fuse caps. This feature, plus a one-piece clip/terminal design, assures low contact resistance. An anti-one-piece clip/terminal design, assures low contact resistance. An anti rotation feature is also available on the solder and QC terminal designs.
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

Frequently Asked Questions

What are the voltage and current ratings for 10x38mm fuses?

10x38mm fuses are available with ratings from 125 to 1000 volts and 1/10 to 30 amperes.

What applications are high-speed fuses designed for?

High-speed fuses protect power semiconductor devices against short circuits in power conversion applications like inverters, variable-speed drives, UPS, and DC drive systems.

What do Littelfuse medium voltage fuses protect?

Medium voltage fuses protect transformers, potential transformers, feeders, and motor circuits.

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.

What standards do Industrial Shock-Block GFCIs meet?

Industrial Shock-Block GFCIs meet UL Standard 943C Class C and Class D for people protection in industrial facilities.

How do arc-flash protection relays work?

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

What is the purpose of trailing-cable protection relays?

Trailing-cable protection relays continuously monitor the ground conductor in portable cables to protect equipment from hazardous voltages caused by ground faults.

What is the benefit of high-resistance grounding?

High-resistance grounding limits point-of-fault damage, eliminates arc-flash hazards, and prevents transit overvoltages associated with ground faults.

What are the features of Littelfuse fuse blocks and holders?

Fuse blocks and holders feature compact designs, indication, and flexibility for DIN-rail mounting.

How do POWR-BLOKS power distribution blocks enhance safety?

POWR-BLOKS offer touch-safe blocks and available covers to reduce the risk of accidental contact, enhancing safety.

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.