Littelfuse LA30QS90-4 - 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

LA30QS90-4

Alternate Item Number: LA30QS904

UPC: 079458161069

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Overview

The Littelfuse LA30QS90-4 Semiconductor Protection Fuse (SKU: LA30QS90-4) is a critical component engineered for the robust protection of sensitive power semiconductor devices. Designed by Littelfuse, a globally recognized leader in circuit protection, this fuse series is specifically intended for applications involving Diodes, Phase Control SCRs, and other high-power semiconductor components operating at voltages of 300V and below. The LA30QS series represents a forward-thinking solution for safeguarding your most critical power electronics, ensuring operational integrity and longevity. At the core of the LA30QS90-4's protective capabilities is its exceptionally low I²t characteristic. This feature is paramount in minimizing the thermal damage to protected semiconductor devices during severe short-circuit events. By limiting the energy let-through, the fuse effectively prevents catastrophic failures, thereby reducing costly downtime and component replacement. Furthermore, the controlled arc voltage generated during fuse clearing is meticulously managed to reduce electrical stress on adjacent circuit components. This controlled energy release is vital in complex power systems where voltage transients can compromise the reliability of other sensitive electronics. Littelfuse understands that industrial applications demand flexibility. The LA30QS90-4 offers a choice of mounting types, providing engineers with the adaptability needed to integrate the fuse seamlessly into unique termination requirements and diverse equipment designs. This ensures a secure and reliable connection, regardless of the specific installation environment. For enhanced operational visibility and maintenance efficiency, indicator options are available. These indicators provide a clear and immediate visual cue when the fuse has operated, simplifying troubleshooting and facilitating prompt replacement, thereby minimizing system downtime. The superior DC capabilities of the LA30QS90-4 make it an ideal choice for demanding direct current applications. It is particularly recommended for the protection of 300-volt heavy-duty rectifiers and similar heavy-duty power supplies. These types of systems are commonly found in industrial automation, power generation, and heavy manufacturing sectors where reliability under continuous load is non-negotiable. By selecting the Littelfuse LA30QS90-4, you are investing in a proven protection solution that upholds the performance and safety standards of your critical power infrastructure. Key Features and Benefits: * **Low I²t:** Minimizes damage to protected semiconductor components during short circuits. * **Controlled Arc Voltage:** Reduces electrical stress on circuit components during fuse clearing. * **Mounting Options:** Provides flexibility for unique termination requirements. * **Indicator Options:** Facilitates easy identification of blown fuses for efficient maintenance. * **Superior DC Capabilities:** Engineered for reliable performance in direct current applications. Applications: * Protection of 300V heavy-duty rectifiers. * Safeguarding diodes and phase control SCRs. * Protection of other heavy-duty power semiconductor devices in power supplies and industrial equipment. When specifying circuit protection for high-power semiconductor devices, the Littelfuse LA30QS90-4 stands out as a superior choice, offering a blend of advanced protection technology, application flexibility, and the trusted reliability synonymous with the Littelfuse brand. Ensure your critical power systems are protected with the best in semiconductor fuse technology.
  • Protects power semiconductors like Diodes and SCRs at 300V and less.
  • Low I²t minimizes damage to protected components during short circuits.
  • Controlled arc voltage reduces stress on circuit components during clearing.
  • Choice of mounting types for unique termination requirements.
  • Indicator options for easy identification of blown fuses.

Specifications

Application
Protection of Semiconductors
Brand Name
Littelfuse
Special Features
Very-Fast Acting
Standard
UL Recognized
Sub Brand
LA Series
Type
Semiconductor Fuse
The Littelfuse LA60X semiconductor protection fuses are popular for the protection of higher voltage heavy rectifiers such as traction rectifiers. They can carry long sustained overloads common with heavy-duty apparatus. The compact hockey-puck; design provides high power protection in a small space. Features: Lowest l2t minimizes damage to protected components on short circuit. Controlled arc voltage reduces stress to circuit components during fuse clearing. Applications: Protection of heavy traction and electrochemical as well as rectifiers and other heavy-duty equipment.

LA60X1200-128

The Littelfuse LA60X semiconductor protection fuses are popular for the protection of higher voltage heavy rectifiers such as traction rectifiers. They can carry long sustained overloads common with heavy-duty apparatus. The compact hockey-puck; design provides high power protection in a small space. Features: Lowest l2t minimizes damage to protected components on short circuit. Controlled arc voltage reduces stress to circuit components during fuse clearing. Applications: Protection of heavy traction and electrochemical as well as rectifiers and other heavy-duty equipment.
Littelfuse French Cylindrical style semiconductor fuses are an extension to the LA70QS series. They offer a solid-fill design with high interrupting ratings and an optional striker for visual or remote blown fuse indication. The international 14 x 51mm and 22 x 58mm sizes are accepted worldwide.

LA70QS40-14F

Littelfuse French Cylindrical style semiconductor fuses are an extension to the LA70QS series. They offer a solid-fill design with high interrupting ratings and an optional striker for visual or remote blown fuse indication. The international 14 x 51mm and 22 x 58mm sizes are accepted worldwide.
Littelfuse French Cylindrical style semiconductor fuses are an extension to the LA70QS series. They offer a solid-fill design with high interrupting ratings and an optional striker for visual or remote blown fuse indication. The international 14 x 51mm and 22 x 58mm sizes are accepted worldwide.

LA70QS50-14FI

Littelfuse French Cylindrical style semiconductor fuses are an extension to the LA70QS series. They offer a solid-fill design with high interrupting ratings and an optional striker for visual or remote blown fuse indication. The international 14 x 51mm and 22 x 58mm sizes are accepted worldwide.
Littelfuse French Cylindrical style semiconductor fuses are an extension to the LA70QS series. They offer a solid-fill design with high interrupting ratings and an optional striker for visual or remote blown fuse indication. The international 14 x 51mm and 22 x 58mm sizes are accepted worldwide.

LA70QS50-14F

Littelfuse French Cylindrical style semiconductor fuses are an extension to the LA70QS series. They offer a solid-fill design with high interrupting ratings and an optional striker for visual or remote blown fuse indication. The international 14 x 51mm and 22 x 58mm sizes are accepted worldwide.
Littelfuse French Cylindrical style semiconductor fuses are an extension to the LA70QS series. They offer a solid-fill design with high interrupting ratings and an optional striker for visual or remote blown fuse indication. The international 14 x 51mm and 22 x 58mm sizes are accepted worldwide.

LA70QS20-22FI

Littelfuse French Cylindrical style semiconductor fuses are an extension to the LA70QS series. They offer a solid-fill design with high interrupting ratings and an optional striker for visual or remote blown fuse indication. The international 14 x 51mm and 22 x 58mm sizes are accepted worldwide.

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.