Littelfuse 460-575 - The 460 is a 3-phase voltage monitor that protects 190-480VAC or 475-600V, 50/60Hz motors regardless of size. The product provides a user selectable nominal voltage setpoint and the voltage monitor automatically senses line voltage. This unique microcontroller-based voltage and phase-sensing device constantly monitors the 3-phase voltages to detect harmful power line conditions such as low, high, and unbalanced voltage, loss of any phase, and phase reversal. When a harmful condition is detected, the 460 output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to an acceptable level for a specified amount of time (restart delay). The trip and restart delays prevent nuisance tripping due to rapidly fluctuating power line conditions. All 460 models feature adjustable 1-30 second trip delay, 1-500 second restart delay, 2-8% voltage unbalance trip point, and one form C contact except where noted.
Littelfuse

460-575

Alternate Item Number: 460-575

UPC: 079458990577

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Overview

The **Littelfuse 460-575 3-Phase Voltage Monitor** is a high-performance, microcontroller-based protection relay engineered to safeguard critical industrial motors operating within 475–600VAC (50/60Hz) environments. Designed for reliability and precision, this advanced voltage monitoring solution continuously evaluates three-phase power conditions to detect harmful anomalies—including undervoltage, overvoltage, phase loss, phase reversal, and voltage unbalance—before they can damage equipment or disrupt operations. **Key Features and Functionality** The 460-575 stands out with its **auto-sensing voltage range**, eliminating the need for manual configuration and reducing setup time in diverse applications. Its **adjustable trip delay (1–30 seconds)** and **restart delay (1–500 seconds)** provide critical flexibility, allowing engineers to tailor response times to specific system dynamics and prevent nuisance tripping during transient conditions such as motor startups or utility grid fluctuations. The device also offers a **user-selectable voltage unbalance trip point (2–8%)**, ensuring early detection of imbalanced loads that could lead to overheating or premature motor failure. **Robust Protection with Intelligent Diagnostics** Built on **microcontroller-based circuitry**, the 460-575 delivers superior accuracy and long-term reliability compared to traditional electromechanical relays. Its **Form C output relay** (one set of contacts) provides a dependable interface for control circuits, enabling seamless integration with PLCs, contactors, alarms, or other industrial automation systems. The relay deactivates immediately upon detecting a fault, isolating the motor from harmful conditions, and reactivates only after power quality stabilizes for the programmed restart delay—ensuring safe, controlled recovery. **Industry Applications and Use Cases** This voltage monitor is ideal for protecting **motors in heavy industrial settings**, including: - **Manufacturing plants** where 600VAC power is standard, such as in pulp and paper, steel, or mining operations. - **Generator-based systems**, particularly in Eastern Canada and remote sites where power quality can be inconsistent. - **HVAC systems** in large commercial buildings or data centers, where voltage fluctuations can compromise efficiency and equipment lifespan. - **Pump and compressor stations** in water treatment, oil & gas, or chemical processing, where phase loss or reversal could lead to catastrophic failures. - **Conveyor systems and material handling** in warehouses or distribution centers, where unbalanced voltage can cause motor overheating and downtime. **Why Choose Littelfuse for Voltage Monitoring?** Littelfuse is a globally recognized leader in circuit protection and industrial control solutions, with decades of expertise in developing products that enhance system reliability and safety. The 460 Series, including the 460-575 model, reflects the company’s commitment to innovation, offering **engineered solutions that combine precision, durability, and ease of integration**. Professionals in industrial maintenance, electrical engineering, and automation trust Littelfuse for products that meet stringent performance standards and regulatory requirements. **Installation and Integration Considerations** The 460-575 is designed for **panel-mount installation** and features clear LED indicators for real-time status monitoring, simplifying troubleshooting and maintenance. Its compact footprint and **universal mounting options** make it suitable for both new installations and retrofit projects. Compliance with industry standards ensures compatibility with global electrical systems, while the device’s **wide operating temperature range** and **high surge withstand capability** guarantee performance in harsh environments. **Selecting the Right Voltage Monitor** When evaluating 3-phase voltage monitors, engineers must consider factors such as **voltage range, trip delay flexibility, contact configuration, and diagnostic capabilities**. The 460-575 excels in applications requiring **high-voltage protection (475–600VAC)** and **customizable response times**, making it a preferred choice for facilities where power quality is a critical concern. Its **proven track record in generator applications** and compatibility with Littelfuse’s broader portfolio of protection relays further solidify its value as a long-term investment in operational continuity. For industries where **motor reliability, energy efficiency, and safety compliance** are non-negotiable, the Littelfuse 460-575 3-Phase Voltage Monitor delivers unmatched protection and peace of mind. Whether safeguarding critical infrastructure or optimizing industrial processes, this device ensures that motors operate within safe parameters, reducing downtime, maintenance costs, and the risk of costly failures.
  • Auto-sensing 475–600VAC range for 50/60Hz motors
  • Adjustable trip delay (1–30 sec) and restart delay (1–500 sec)
  • Detects low/high voltage, phase loss, reversal, and 2–8% unbalance
  • Microcontroller-based for high accuracy and reliability
  • Form C output relay with LED diagnostics for easy monitoring

Specifications

Brand Name
Littelfuse
Connection Type
Screw Terminal
Frequency
50/60 Hz
Mounting Type
Panel-Mount
Operating Temperature
-4 to 158
Operating Temperature, Maximum
158
Operating Temperature, Minimum
-4
Output Contact
1 Form C
Poles
1 Form C Contact
Poles
3
Restart Delay
1-500 seconds
Series
460
Standard
UL/CE
Sub Brand
Symcom
Trip Delay
1-30 seconds
Voltage Rating
190-600 VAC
Voltage Rating
475-600 VAC
Voltage Unbalance Trip Point
2-8%
Package Dimensions (L x W x H)
2.35 IN x 2.08 IN x 3.5 IN
Package Dimensions (L x W x H)
59.7 mm x 52.9 mm x 88.9 mm
The 460 is a 3-phase voltage monitor that protects 190-480VAC or 475-600V, 50/60Hz motors regardless of size. The product provides a user selectable nominal voltage setpoint and the voltage monitor automatically senses line voltage. This unique microcontroller-based voltage and phase-sensing device constantly monitors the 3-phase voltages to detect harmful power line conditions such as low, high, and unbalanced voltage, loss of any phase, and phase reversal. When a harmful condition is detected, the 460 output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to an acceptable level for a specified amount of time (restart delay). The trip and restart delays prevent nuisance tripping due to rapidly fluctuating power line conditions. All 460 models feature adjustable 1-30 second trip delay, 1-500 second restart delay, 2-8% voltage unbalance trip point, and one form C contact except where noted.

460-MR

The 460 is a 3-phase voltage monitor that protects 190-480VAC or 475-600V, 50/60Hz motors regardless of size. The product provides a user selectable nominal voltage setpoint and the voltage monitor automatically senses line voltage. This unique microcontroller-based voltage and phase-sensing device constantly monitors the 3-phase voltages to detect harmful power line conditions such as low, high, and unbalanced voltage, loss of any phase, and phase reversal. When a harmful condition is detected, the 460 output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to an acceptable level for a specified amount of time (restart delay). The trip and restart delays prevent nuisance tripping due to rapidly fluctuating power line conditions. All 460 models feature adjustable 1-30 second trip delay, 1-500 second restart delay, 2-8% voltage unbalance trip point, and one form C contact except where noted.
CM-PVE UNDER & OVERVOLT. 3PH.+N

1SVR550870R9400

CM-PVE UNDER & OVERVOLT. 3PH.+N
Three Phase Monitor Relay; DIN-Mount; 190-500V; 10A DPDT; Phase Loss; Reversal; Unbalance; Under/Over Voltage

PMDU

Three Phase Monitor Relay; DIN-Mount; 190-500V; 10A DPDT; Phase Loss; Reversal; Unbalance; Under/Over Voltage
Relay 460V 3 Phase Monitor

18883000015

Relay 460V 3 Phase Monitor

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.