Littelfuse H313.300P - SLO-BLO GLASS FUSE H-PACK .300A. The 3AG Slo-Blo® fuse solves a broad range of application requirements while offering reliable performance and costeffective circuit protection. Features: 313 and 315 series fuses have time-delayed in the overload range, which provides superior protection inductive loads such as motors, transformers, and solenoids. 3AG indicating fuses instantly identify themselves upon opening by showing a discoloration of their glass bodies. Guesswork and time-consuming circuit testing is eliminated. This unique design offers the same quality performance characteristics as the standard 3AG fuse design.
Littelfuse

H313.300P

Alternate Item Number: 0313.300HXP

UPC: 079458922707

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Overview

The Littelfuse H313.300P Slo-Blo® Glass Fuse (SKU: H313.300P) from the 3AG series delivers superior circuit protection for industrial applications requiring reliable performance under inductive load conditions. Designed to meet the demanding requirements of motors, transformers, solenoids, and other inductive loads, this time-delayed fuse provides a cost-effective solution without compromising on safety or durability. The 313 and 315 series fuses feature a time-delayed response in the overload range, allowing them to handle temporary current surges common in startup and transient conditions while ensuring rapid interruption during fault conditions. This makes them particularly well-suited for applications where nuisance tripping must be minimized, such as in HVAC systems, industrial machinery, and power distribution networks. A standout feature of the H313.300P is its 3AG indicating design, which provides visual confirmation of fuse operation. Upon opening, the glass body discolors, instantly signaling that the fuse has blown. This eliminates the need for time-consuming circuit testing or multimeter checks, significantly reducing troubleshooting time and improving operational efficiency. For maintenance teams and engineers, this feature translates to faster diagnostics, reduced downtime, and lower labor costs associated with fault identification. The indicating capability is especially valuable in critical applications where rapid response is essential to prevent equipment damage or safety hazards. The H313.300P Slo-Blo Glass Fuse is engineered to meet the rigorous demands of industrial environments, where reliability and longevity are paramount. Littelfuse, a global leader in circuit protection solutions, has designed this fuse to deliver consistent performance across a wide range of operating conditions. The 3AG form factor ensures compatibility with standard fuse blocks and holders, making it a versatile choice for retrofitting existing systems or designing new installations. Whether used in control panels, power supplies, or motor starters, this fuse provides a dependable barrier against overcurrent events, protecting sensitive components and extending the lifespan of connected equipment. Selecting the right fuse for an application involves balancing response time, current rating, and environmental factors. The H313.300P’s 0.300A rating makes it ideal for protecting low-to-moderate current circuits, such as those found in control circuits, relays, and small motors. Its time-delayed characteristic ensures it can withstand brief overloads without interrupting operation, while still providing fast-acting protection during sustained faults. This balance is critical in applications involving inductive loads, where inrush currents can be significantly higher than steady-state operating currents. By choosing a Slo-Blo fuse, engineers can avoid unnecessary interruptions while maintaining robust protection against short circuits and ground faults. Installation of the H313.300P is straightforward, requiring no specialized tools or procedures. The fuse fits standard 3AG fuse holders, which are widely available and compatible with most industrial enclosures. When installing, professionals should ensure proper seating to avoid poor contact, which can lead to overheating or nuisance tripping. Regular inspection of the fuse and holder is recommended to confirm integrity, particularly in harsh or vibration-prone environments. For applications with high vibration or temperature fluctuations, Littelfuse offers additional accessories such as fuse clips and holders designed to enhance stability and performance. Littelfuse’s reputation as a trusted provider of circuit protection solutions is built on decades of innovation and reliability. The company’s Slo-Blo series, including the H313.300P, is a testament to its commitment to delivering products that meet the evolving needs of industrial, commercial, and residential markets. With a global distribution network and a focus on quality assurance, Littelfuse ensures that customers receive consistent, high-performance fuses that adhere to industry standards such as UL, CSA, and IEC. For engineers and procurement teams seeking a dependable, cost-effective fuse solution for inductive load protection, the Littelfuse H313.300P Slo-Blo Glass Fuse is an excellent choice.
  • Time-delayed response for superior protection of inductive loads (motors, transformers, solenoids)
  • 3AG indicating design visibly discolors upon opening for quick fault identification
  • 0.300A rating ideal for low-to-moderate current circuit protection
  • Cost-effective solution with reliable performance in industrial applications
  • Compatible with standard 3AG fuse holders for easy installation and retrofitting

Specifications

Amperage Rating
.300 Amps
Application
electronic equipment & appliances
Brand Name
Littelfuse
Special Features
Slo-Blo
Standard
UL Standard 248-14
Sub Brand
313 Series
Type
3AG Slo-Blo
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.