Littelfuse LEYBYCS - The Littelfuse 600 V in-line watertight fuse holders are the ideal answer for all high humidity and corrosive environments where fuses are required. Available in both breakaway and non-breakaway, single and double pole versions, these fuse holders allow maximum flexibility for any application.
Littelfuse

LEYBYCS

Alternate Item Number: 0LEYBYCSX

UPC: 079458020960

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Overview

The Littelfuse LEYBYCS 600V in-line watertight fuse holders are purpose-built for demanding industrial, marine, and outdoor applications where moisture, dust, and corrosive conditions threaten electrical integrity. These fuse holders deliver reliable circuit protection in environments such as street lighting, parking lot lighting, traffic signaling, sports lighting, boats, marinas, and industrial machinery exposed to high humidity or chemical vapors. Available in both breakaway and non-breakaway configurations, as well as single and double pole versions, the LEYBYCS series offers unmatched flexibility to meet diverse application requirements. Designed to accommodate MINI® fuses from 2 to 30 amps, these holders feature a rugged construction with heavy-duty wire leads: 12-gauge orange for 25–30A applications and 14-gauge black for 2–20A applications. Each unit includes a protective cover and a 4-inch wire lead for quick, secure connections. The breakaway feature enables safe disconnection of the load side during a pole knockdown without disrupting the fuse, keeping the fuse encapsulated and protected. Non-breakaway versions provide a permanent, secure connection. Key specifications include a 600V voltage rating, a maximum current of 30A, and a temperature rating of 155°C. The fuse holders are UL Listed (Class CC and Midget guides), CSA Certified, and RoHS compliant. With three internal O-rings per pole for watertight sealing, colored O-rings for quick detection, and a high-impact, heat-resistant insulator, the LEYBYCS series ensures long-term durability in the most challenging conditions. Manufactured in the US, these fuse holders are ideal for applications requiring compliance with state and federal standards, including highway commission requirements.
  • 600V voltage rating with 30A maximum current capacity
  • Available in breakaway and non-breakaway, single and double pole configurations
  • Accommodates MINI® fuses from 2 to 30 amps
  • Three internal O-rings per pole for watertight sealing in corrosive/humid environments
  • Heavy-duty 12-gauge orange (25–30A) and 14-gauge black (2–20A) wire leads with 4-inch length
  • UL Listed (Class CC & Midget), CSA Certified, and RoHS compliant
  • High-impact, heat-resistant insulator rated to 155°C
  • Colored O-rings for quick detection and polarized dual pole for simultaneous disconnection
  • Protective cover included; breakaway feature enables safe load disconnection without fuse disruption
  • Manufactured in the US for compliance with state/federal standards

Specifications

Application
Street Lighting
Brand Name
Littelfuse
Color
Orange, Black
Connection Type
Wire Leads (12 AWG, 14 AWG)
Connection Type
Wire Leads
Current Rating
2-30 A
Ip Rating
IP66/IP67
Material
Poly
Poles
Single/Double Pole
Poles
Single, Double
Series
600V in-line watertight fuse holders
Series
LEYBYCS
Size
4-inch wire leads
Special Features
Watertight
Sub Brand
LEY Series
Type
Fuseholder
Voltage Rating
600 V
The Littelfuse 600 V in-line watertight fuse holders are the ideal answer for all high humidity and corrosive environments where fuses are required. Available in both breakaway and non-breakaway, single and double pole versions, these fuse holders allow maximum flexibility for any application.

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The Littelfuse 600 V in-line watertight fuse holders are the ideal answer for all high humidity and corrosive environments where fuses are required. Available in both breakaway and non-breakaway, single and double pole versions, these fuse holders allow maximum flexibility for any application.
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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.