Littelfuse PGR-4300-120 - PGR-4300-120 is a generator ground-fault relay with a supply voltage ac of 120.
Littelfuse

PGR-4300-120

Alternate Item Number: PGR-4300-120

UPC: 079458177367

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Overview

The **Littelfuse PGR-4300-120 Generator Ground-Fault Relay** is a high-performance, space-saving protection device engineered to detect ground-fault conditions in generator systems without the need for external current transformers (CTs). Designed for industrial, commercial, and critical power applications, this relay provides precise, reliable ground-fault monitoring to safeguard personnel, equipment, and infrastructure from hazardous electrical faults. With a **120VAC control power supply**, the PGR-4300-120 is ideal for integration into generator panels, transfer switches, and distributed power systems where space constraints, installation complexity, or cost considerations make traditional CT-based solutions impractical. Ground-fault relays are essential components in modern electrical systems, particularly in generator applications where ungrounded or high-resistance grounded systems are common. The **PGR-4300 series** addresses a critical need in these environments by offering a **CT-free detection method**, which eliminates the complexity of installing and wiring current transformers while maintaining robust fault detection capabilities. This feature is especially valuable in retrofits, compact installations, or applications where access to wiring paths is limited. The relay’s **adjustable pickup range (100–1200A)** and **adjustable time delay (0–1.0s)** provide system designers and engineers with the flexibility to tailor protection settings to specific generator ratings and coordination requirements, ensuring seamless integration with existing protection schemes. Key features of the PGR-4300-120 include: - **No CTs required**: Simplifies installation, reduces wiring complexity, and lowers material costs while maintaining high accuracy. - **Adjustable trip settings**: Customizable pickup (100–1200A) and time delay (0–1.0s) for precise fault detection and system coordination. - **Neutral-to-ground (N-G) continuity monitoring**: Continuously verifies the integrity of the grounding path, alerting operators to potential open-circuit conditions that could compromise safety. - **Form C output contacts**: Provides versatile alarming or tripping functionality for integration with SCADA systems, PLCs, or local annunciation panels. - **Analog output (0–1mA)**: Enables connection to optional meters (e.g., Littelfuse PGA-0500) for real-time ground-fault current visualization as a percentage of the set point. - **Passive filtering**: Minimizes nuisance tripping caused by transient conditions, ensuring reliable operation in noisy electrical environments. The PGR-4300-120 is **UL Listed (E183688)** and backed by Littelfuse’s **5-year warranty**, reflecting the manufacturer’s commitment to quality and reliability. Its compact dimensions (**75mm H x 55mm W x 115mm D**) and flexible mounting options (DIN rail, surface, or panel with optional adapters) make it suitable for tight spaces and diverse installation scenarios. Whether deployed in **data centers, healthcare facilities, manufacturing plants, or remote power stations**, this relay delivers consistent performance while reducing downtime and maintenance overhead. Littelfuse, a global leader in circuit protection and electrical safety solutions, has designed the PGR-4300 series to meet the demands of modern power systems where **safety, reliability, and ease of installation** are paramount. By eliminating the need for CTs, the PGR-4300-120 not only streamlines deployment but also reduces the risk of installation errors, a critical factor in high-stakes applications. For engineers and technicians seeking a **cost-effective, space-efficient ground-fault protection solution**, the PGR-4300-120 stands out as a trusted choice, combining Littelfuse’s engineering expertise with industry-leading protection standards.
  • No current transformers (CTs) required for simplified installation
  • Adjustable pickup (100–1200A) and time delay (0–1.0s) for system coordination
  • Neutral-to-ground (N-G) continuity monitoring for safety compliance
  • Form C output contacts for alarming or tripping applications
  • Analog output (0–1mA) for integration with meters or control systems

Specifications

Application
NA
Brand Name
Littelfuse
Special Features
Operates on solidly grounded AC systems
Standard
UL Listed
Sub Brand
PGR 4300 Series
Type
Protection Relay
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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.