Littelfuse H312003P - FAST-ACTING TYPE GLASS H-PACK 3A. The 3AG Fast-Acting Fuse solves a broad range of application requirements while offering reliable performance and cost-effective circuit protection. Features: In accordance with UL Standard 248-14. Available in cartridge and axial lead format and with various forming dimensions. RoHS compliant and Lead-free.
Littelfuse

H312003P

Alternate Item Number: 0312003.HXP

UPC: 079458921953

Documents & Media
BrochureTechnical BulletinTechnical DrawingSpecification Sheet

Contact for Pricing

Minimum Qty: 100

Multiplier: 100

*Contact for lower quantities*

Overview

The **Littelfuse H312003P 3AG Fast-Acting Fuse** is a high-performance, cost-effective circuit protection solution engineered for industrial, commercial, and automotive applications where rapid fault interruption is critical. Designed to meet **UL Standard 248-14**, this fuse delivers reliable overcurrent protection with fast-acting response times to safeguard sensitive electronics, motors, transformers, and control systems. With a **3A current rating**, the H312003P is ideal for protecting low-power circuits, signal lines, and auxiliary components in equipment such as power supplies, lighting systems, and instrumentation panels. A key advantage of the **3AG Fast-Acting Fuse** is its **versatile form factor**, available in both **cartridge and axial lead configurations** to accommodate diverse installation requirements. The cartridge-style fuse is commonly used in industrial control panels, while the axial lead version is preferred for compact PCB-mounted applications or where space constraints demand a low-profile solution. This flexibility ensures seamless integration into existing systems without requiring costly redesigns or modifications. Engineered for **durability and precision**, the H312003P features a **glass body construction** that provides excellent thermal and mechanical stability, even in harsh operating environments. Its **RoHS-compliant, lead-free design** aligns with global environmental regulations, making it a sustainable choice for modern manufacturing and assembly processes. The fuse’s compliance with **UL 248-14** guarantees consistent performance across a wide temperature range, ensuring predictable operation in both high-heat industrial settings and cooler commercial applications. Industries that rely on the **Littelfuse H312003P** include **automotive manufacturing, telecommunications, renewable energy systems, and industrial automation**. In automotive applications, it protects low-voltage circuits in infotainment systems, lighting modules, and sensor networks. For telecommunications, it safeguards power distribution units and signal integrity in base stations and data centers. Renewable energy systems, such as solar inverters and wind turbine controllers, benefit from its ability to interrupt faults quickly, preventing damage to sensitive power electronics. Industrial machinery, including CNC machines, robotics, and conveyor systems, uses the H312003P to protect control circuits, relays, and solenoids from overload conditions. Selecting the right fuse for a specific application requires careful consideration of **current rating, response time, and environmental conditions**. The **3AG Fast-Acting Fuse** is designed for applications where **fast response is essential** to prevent damage from short circuits or transient overcurrents. Unlike slow-blow fuses, which tolerate temporary surges, the H312003P interrupts faults almost instantaneously, making it ideal for protecting semiconductors, capacitors, and other sensitive components. Professionals should verify that the fuse’s **voltage rating** (typically 250V or higher for 3AG fuses) exceeds the system’s operating voltage to ensure safe and reliable operation. Littelfuse, a global leader in circuit protection solutions, has been delivering innovative and high-quality fuses for over a century. The company’s **3AG series** is trusted by engineers worldwide for its **consistent performance, long service life, and adherence to stringent safety standards**. With a reputation for reliability and technical expertise, Littelfuse provides comprehensive support, including **datasheets, application notes, and technical assistance**, to help customers optimize their circuit protection strategies. The **H312003P** exemplifies this commitment, offering a **cost-effective, high-performance solution** for protecting critical systems across multiple industries. For professionals seeking a **trusted, compliant, and versatile fuse solution**, the Littelfuse H312003P 3AG Fast-Acting Fuse delivers unmatched protection, durability, and ease of integration. Whether used in **industrial automation, automotive electronics, or renewable energy systems**, this fuse ensures that sensitive circuits remain safe from overcurrent events, minimizing downtime and reducing the risk of costly equipment failures.
  • 3A fast-acting fuse for precise circuit protection
  • Available in cartridge and axial lead formats for versatile installation
  • Meets UL Standard 248-14 for consistent performance and safety
  • RoHS compliant and lead-free for environmental sustainability
  • Glass body construction for thermal and mechanical durability

Specifications

Application
NA
Brand Name
Littelfuse
Connection Type
Cartridge/Axial Lead
Current Rating
3 A
Material
Glass
Series
3AG Fast-Acting
Size
3AG
Special Features
Available in cartridge and axial lead format
Standard
UL Standard 248-14
Sub Brand
312 Series
Type
Fast Acting Fuse
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.