Littelfuse HCB-3/45/Q - 120/240V 45A 3P CIRCUIT BREAKER, LUGS/QUICK CONNECT
Littelfuse

HCB-3/45/Q


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Specification Sheet

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Overview

The Littelfuse HCB-3/45/Q 3-pole circuit breaker is a robust industrial-grade solution engineered for reliable overcurrent protection in demanding electrical systems. Rated at 45 amperes with a 120/240VAC rating, this circuit breaker is specifically designed to safeguard critical infrastructure across a wide range of industrial applications. Whether deployed in manufacturing facilities, commercial buildings, or heavy machinery installations, the HCB-3/45/Q delivers consistent performance under high-load conditions while maintaining compliance with stringent safety standards such as UL 489 and CSA C22.2 No. 5. Its dual terminal configuration—featuring both lug and quick-connect options—ensures installation flexibility, allowing electricians to adapt wiring methods to project-specific requirements without compromising reliability or safety. This circuit breaker is part of Littelfuse’s comprehensive portfolio of industrial protection devices, a brand synonymous with innovation and durability in electrical safety. The HCB-3/45/Q is particularly well-suited for environments where operational continuity is essential, including HVAC systems, motor control centers, panelboards, and industrial machinery. Its compact 3-pole design optimizes space in crowded control panels while providing full-phase protection, reducing the risk of unplanned downtime due to overcurrent events. The breaker’s thermal-magnetic trip mechanism ensures rapid response to fault conditions, protecting downstream equipment and personnel from damage or injury. Selecting the right circuit breaker for industrial use requires careful consideration of voltage, current rating, pole configuration, and terminal type. The HCB-3/45/Q addresses these needs with a 45A continuous current rating, making it ideal for circuits powering motors, transformers, or resistive loads. The inclusion of both lug and quick-connect terminals enhances installation versatility, enabling compatibility with solid wire, stranded conductors, or plug-in accessories. This flexibility is especially valuable in retrofit projects or when upgrading existing systems where wiring configurations may vary. Littelfuse’s reputation for quality and reliability is built on decades of engineering excellence and adherence to global safety certifications. The HCB-3/45/Q circuit breaker is manufactured to meet rigorous industry standards, ensuring consistent operation even in harsh or high-vibration environments. Its durable molded case and corrosion-resistant components contribute to long service life, reducing total cost of ownership through fewer replacements and lower maintenance overhead. Professionals in electrical contracting, facility management, and industrial maintenance rely on Littelfuse products for their proven performance and ease of integration. The HCB-3/45/Q is not just a protective device—it is a critical component in a comprehensive electrical safety strategy. By choosing this breaker, engineers and technicians gain peace of mind knowing their systems are protected by a trusted name in industrial electrical protection, backed by comprehensive technical support and global distribution networks.
  • 45A rated 3-pole circuit breaker for 120/240V industrial systems
  • Dual terminal design: lugs and quick-connect for flexible wiring options
  • Thermal-magnetic trip mechanism for fast fault response and equipment protection
  • UL 489 and CSA C22.2 No. 5 certified for global safety compliance
  • Compact design optimized for space-constrained control panels and enclosures

Specifications

Connection Type
Lugs/Quick Connect
Current Rating
45 A
Poles
3P
Series
HCB
Voltage Rating
120/240 Vac
Ground Lug

DNGL

Ground Lug
RELEASE UNDERVOLTAGE BS DWB400 D70

BS DWB400D70

RELEASE UNDERVOLTAGE BS DWB400 D70
LUG LT1A-UBW800

LT1A-UBW800

LUG LT1A-UBW800
JB5-2 2 POLE JUMPER 5.2MM SPACING

1SNK905302R0000

JB5-2 2 POLE JUMPER 5.2MM SPACING
JB5-5 5 POLE JUMPER 5.2MM SPACING

1SNK905305R0000

JB5-5 5 POLE JUMPER 5.2MM SPACING
One-hole, metric conductor, standard barrel with window lug, 4-6mm wire, M8 stud hole.

LCMA6-8-C

One-hole, metric conductor, standard barrel with window lug, 4-6mm wire, M8 stud hole.

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.