Littelfuse LA30QS100-4 - The Littelfuse LA30QS series Semiconductor protection fuses are intended for the protection of Power Semiconductors such as Diodes, Phase Control SCR and other Power Semiconductor devices. The LA30QS is recommended for new applications providing solutions for your critical protection needs at 300V and less semiconductors. Features: Low l2t minimizes damage to protected components on short circuit. Controlled arc voltage reduces stress to circuit components during fuse clearing. Choice of mounting types provides options for unique termination requirements. Indicator options allow identification of blown fuses. Superior DC capabilities. Applications: Protection of 300 volt heavy duty rectifiers and similar heavy duty power supplies.
Littelfuse

LA30QS100-4

Alternate Item Number: LA30QS1004

UPC: 079458161076

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Overview

The Littelfuse LA30QS100-4 Semiconductor Protection Fuse is engineered to provide robust and reliable protection for critical power semiconductor devices. Specifically designed for applications involving diodes, phase control SCRs, and other sensitive power semiconductor components operating at voltages of 300V and below, this fuse is an essential component for ensuring system integrity and longevity. Its advanced design prioritizes the minimization of damage to protected equipment during fault conditions, a crucial factor in high-power industrial environments. One of the standout features of the LA30QS series, including the LA30QS100-4, is its exceptionally low I²t rating. This characteristic is paramount in limiting the thermal stress and potential damage to power semiconductors when a short circuit occurs. By rapidly interrupting the fault current and dissipating energy efficiently, the fuse significantly reduces the duration and intensity of the fault, thereby safeguarding the expensive and vital semiconductor devices they protect. This proactive protection strategy is vital for preventing cascading failures and costly downtime in industrial power systems. Furthermore, the Littelfuse LA30QS100-4 incorporates controlled arc voltage technology. During the fuse clearing process, the generated arc voltage is carefully managed to prevent excessive voltage spikes from propagating through the circuit. This controlled arc behavior minimizes stress on other sensitive circuit components, such as capacitors and gate drive circuitry, contributing to the overall reliability and stability of the power system. This feature is particularly important in applications where precise voltage regulation and component longevity are critical. The LA30QS100-4 offers considerable flexibility in terms of installation and maintenance. It is available with a choice of mounting types, allowing engineers to select the most suitable termination method for unique application requirements and existing infrastructure. This adaptability ensures seamless integration into diverse power supply designs. Additionally, indicator options are available, providing a clear visual indication when the fuse has operated. This feature greatly simplifies troubleshooting and maintenance procedures, enabling rapid identification of blown fuses and minimizing diagnostic time. With superior DC capabilities, the LA30QS100-4 is exceptionally well-suited for demanding DC applications. It is the recommended choice for protecting 300-volt heavy-duty rectifiers, high-power DC power supplies, and similar industrial power conversion equipment. The Littelfuse brand is synonymous with quality and reliability in the protection device market, and the LA30QS series continues this legacy by offering advanced solutions for your most critical protection needs. Choosing the LA30QS100-4 means investing in dependable protection that enhances the performance and lifespan of your power semiconductor assets. Key benefits and features of the Littelfuse LA30QS100-4 include: * **Minimized Damage:** Low I²t rating effectively limits damage to protected power semiconductors during short circuits. * **Reduced Component Stress:** Controlled arc voltage technology minimizes stress on other circuit components during fuse clearing. * **Application Flexibility:** Choice of mounting types accommodates unique termination requirements. * **Easy Identification:** Indicator options facilitate quick and easy identification of blown fuses. * **Superior DC Performance:** Engineered for high-reliability in DC power applications. * **Targeted Protection:** Ideal for safeguarding 300V heavy-duty rectifiers, diodes, phase control SCRs, and other power semiconductor devices. This fuse is an indispensable component for industries relying on robust power electronics, including renewable energy systems, industrial automation, motor drives, and heavy-duty power supplies.
  • Protects diodes, phase control SCRs, and other power semiconductors up to 300V.
  • Low I²t rating minimizes damage to protected components during short circuits.
  • Controlled arc voltage reduces stress on circuit components during fuse clearing.
  • Choice of mounting types for flexible termination requirements.
  • Indicator options available for easy identification of blown fuses.
  • Superior DC capabilities for heavy-duty rectifier and power supply protection.

Specifications

Application
Protection of Semiconductors
Brand Name
Littelfuse
Current Rating
100 A
Mounting Type
Choice of mounting types
Series
LA30QS
Special Features
Very-Fast Acting
Standard
UL Recognized
Sub Brand
LA Series
Type
Semiconductor Fuse
Voltage Rating
300 V
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.