Littelfuse SB4030-521-00 - The Industrial Shock Block® SB4000 series is available for use in single-phase, split-phase, three-phase and 4-wire systems from 208 -240 V on 30 A branch circuits. The power system can be either solidly or high-resistance grounded. All SB4000 models equipped with connections for a neutral wire have built-in grounded-neutral protection per the UL 943 standard. The standard enclosure is IP 69K/NEMA 4X and outdoor rated, suitable for all industrial environments including high temperature wash down used in food production applications. The SB4000 includes advanced harmonic filtering, an automatic self-test feature, and is compliant to the UL 1998 Software in Programmable Components standard. The SB4000 is available as a 208 - 240 V Class A GFCI, allowing new construction or retro-fit projects to meet NEC 210.8 for a wide variety of single-phase, split-phase, three-phase and 4-wire (neutral supported) loads on 30 A circuits.
Littelfuse

SB4030-521-00

Alternate Item Number: SB4030-521-00

UPC: 079458643503

Contact for Pricing

Overview

The Littelfuse SB4030-521-00 Industrial Shock Block® is a Class A Ground-Fault Circuit Interrupter (GFCI) designed for enhanced personnel safety in industrial settings. This unit operates on 208-240 V systems and is rated for 30 A branch circuits, making it suitable for a wide range of single-phase, split-phase, three-phase, and 4-wire (neutral supported) loads. It meets NEC 210.8 requirements for new construction or retro-fit projects in non-dwelling units with wet areas, such as commercial kitchens and construction sites. The SB4000 series, including the SB4030-521-00, features advanced harmonic filtering to ensure reliable operation even with complex loads. It includes an automatic self-test function for continuous monitoring of its protective capabilities and is compliant with UL 1998 for Software in Programmable Components. The standard enclosure is rated IP 69K/NEMA 4X and is suitable for outdoor use and harsh industrial environments, including high-temperature washdown applications common in food production. The device supports both solidly and high-resistance grounded power systems. Models equipped with neutral connections incorporate built-in grounded-neutral protection as per UL 943 standards. This specific model, SKU SB4030-521-00, provides Class A GFCI protection, essential for safeguarding personnel from electrical shock hazards in demanding industrial electrical systems.
  • Class A GFCI protection for 208-240 V, 30 A circuits
  • Suitable for single-phase, split-phase, three-phase, and 4-wire systems
  • IP 69K/NEMA 4X outdoor-rated enclosure for harsh industrial environments
  • Advanced harmonic filtering and automatic self-test feature
  • Meets NEC 210.8 requirements for wet locations in non-dwelling units

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.