Littelfuse H313015P - SLO-BLO GLASS FUSE H-PACK 15A. 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

H313015P

Alternate Item Number: 0313015.HXP

UPC: 079458923339


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Overview

The **Littelfuse 3AG Slo-Blo® 15A Glass Fuse (SKU: H313015P)** delivers superior circuit protection for industrial applications where inductive loads such as motors, transformers, and solenoids demand precise and reliable performance. Designed to meet the rigorous standards of modern industrial environments, this fuse combines time-delayed overload protection with fast-acting fault interruption, ensuring optimal equipment safety and operational continuity. As part of Littelfuse’s trusted 313 and 315 series, the H313015P fuse is engineered to address the unique challenges of inductive circuits, where startup surges and transient overloads are common. Industrial professionals rely on **Slo-Blo® technology** to protect sensitive and high-inertia loads without nuisance tripping. Unlike standard fuses, the time-delayed response in the overload range allows for temporary current spikes during motor startups or transformer energization, while still providing robust protection against sustained overcurrent conditions. This balance of responsiveness and durability makes the 3AG Slo-Blo® fuse ideal for applications in manufacturing, HVAC systems, power distribution, and renewable energy installations. A standout feature of the **Littelfuse 3AG indicating fuse** is its visual identification capability. Upon opening, the glass body discolors at the fuse element, providing immediate visual confirmation of a blown fuse—eliminating the need for time-consuming circuit testing or diagnostic tools. This feature significantly reduces troubleshooting time, minimizes equipment downtime, and enhances maintenance efficiency in critical operations. Whether deployed in control panels, machinery enclosures, or distribution boards, the H313015P ensures rapid fault identification and simplified replacement. Littelfuse, a global leader in circuit protection solutions, has built a reputation for innovation and reliability across industries such as automotive, aerospace, industrial automation, and energy. The company’s 3AG series fuses are widely recognized for their consistent performance, compact 3AG (¼-inch x 1¼-inch) form factor, and compliance with international safety standards. Professionals in electrical engineering, maintenance, and procurement consistently choose Littelfuse for its engineering expertise, global distribution network, and commitment to quality assurance. Installation is straightforward, with the 3AG fuse designed for standard fuse holders and clips, ensuring compatibility with existing infrastructure. The glass body construction not only facilitates visual inspection but also withstands harsh environmental conditions, including vibration and temperature fluctuations. For engineers and technicians seeking a cost-effective, high-performance solution for inductive load protection, the **Littelfuse 3AG Slo-Blo® 15A Glass Fuse (H313015P)** stands as a proven choice—delivering peace of mind through reliable operation and long service life in demanding industrial settings.
  • Time-delayed overload protection for inductive loads (motors, transformers, solenoids)
  • 3AG glass body with visual indication upon opening (discoloration)
  • Superior protection against sustained overcurrent while allowing temporary surges
  • Compact 3AG (¼" x 1¼") design for standard fuse holders
  • Trusted Littelfuse quality with global compliance and reliability

Specifications

Amperage Rating
15 AMPS
Application
electronic equipment & appliances
Brand Name
Littelfuse
Current Rating
15 A
Material
Glass
Mounting Type
Fuse Holder/Clip
Series
313/315 series
Size
3AG (¼-inch x 1¼-inch)
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.