Littelfuse ER-5KV - ER-5KV is a sensing resistor accessory used on systems up to 5 kV (continuous duty). It is an accessory for SE-330, SE-325, and SE-330AU.
Littelfuse

ER-5KV

Alternate Item Number: ER-5KV

UPC: 079458977936

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Overview

The Littelfuse ER-5KV (SKU: ER-5KV) is a vital sensing resistor accessory designed for industrial systems operating up to 5 kV continuous duty. This accessory serves as the essential interface for Littelfuse SE-330, SE-325, and SE-330AU series relays, effectively reducing hazardous voltage levels to ensure safe and reliable operation. Engineered for precision and durability, the ER-5KV is part of Littelfuse's ER Series, providing a low-resistance path for fault currents in systems utilizing neutral grounding resistors (NGRs) or other high-resistance grounding configurations. This enables sensitive ground-fault detection and protects downstream equipment from overvoltage. The ER-5KV is compatible with current transformers (CTs) such as the Littelfuse ELCT5 (5 A primary) and ELCT30 (30 A primary) series, facilitating seamless integration into existing protection schemes for both low-resistance NGRs and other grounding applications. Industries including power generation, oil and gas, mining, and manufacturing benefit from its critical safety and monitoring functions. For instance, in power generation, it aids in detecting ground faults in medium-voltage systems to prevent failures and minimize downtime. In oil and gas, it helps meet stringent safety standards and protect sensitive equipment from transient overvoltages. The accessory features NEMA 3R weather protection, making it suitable for both indoor and outdoor installations in harsh environments. Professionals in electrical engineering and maintenance trust Littelfuse for reliable circuit protection and sensing solutions. The ER-5KV offers ease of installation and can be paired with the Littelfuse SE-IP65CVR-G hinged transparent cover for enhanced tamper resistance and IP65 protection. When selecting a sensing resistor accessory, consider system voltage, fault current levels, and environmental conditions. The ER-5KV is optimized for systems up to 5 kV with continuous duty cycles, ensuring consistent performance. Its compatibility with CTs and accessories like the SE-MRE-600 and RK-332 allows for flexible system design.
  • Designed for industrial systems up to 5 kV continuous duty
  • Accessory for Littelfuse SE-330, SE-325, and SE-330AU relays
  • Facilitates sensitive ground-fault detection
  • Compatible with Littelfuse ELCT5 and ELCT30 series CTs
  • NEMA 3R weather protection for indoor/outdoor use

Specifications

Application
NA
Brand Name
Littelfuse
Special Features
Used On Systems Up To 5 kV
Standard
CSA, UL
Sub Brand
ER-5KV Series
Type
Protection Relay
Package Weight (Imperial)
11.000 L
Package Weight (Metric)
5.000 kg

Similar Products

ER-5WP

Special Features: Used with the SE-325, SE-330, and SE-330AU

Sub Brand: ER 5WP Series

Voltage Rating: 5 kV AC

ER-1000HV

Special Features: Used with the SE-330HV

Standard: UL, CSA, C-Tick

Sub Brand: ER-1000HV Series

ER-15KV

Special Features: Used On Systems Up To 15 kV

Sub Brand: ER-15KV Series

Voltage Rating: 15 kV

ER-25KV

Special Features: Used On Systems Up To 25 kV

Sub Brand: ER-25KV Series

Voltage Rating: 25 kV

ER-35KV

Special Features: Used On Systems Up To 35 kV

Sub Brand: ER-35KV Series

Voltage Rating: 35 kV

ER-600VC

Special Features: Used On Systems Up To 1 kV

Sub Brand: ER-600VC Series

Voltage Rating: 1 kV

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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.