Littelfuse ER-25KV - ER-25KV is a sensing resistor accessory used on systems up to 25 kV (non-continuous duty). It is an accessory for SE-330, SE-325, SE-330AU, and SE-330HV.
Littelfuse

ER-25KV

Alternate Item Number: ER-25KV

UPC: 079458977912


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Overview

The Littelfuse ER-25KV is a specialized sensing resistor accessory designed for high-voltage industrial applications, specifically for systems operating up to 25 kV on a non-continuous duty basis. This accessory is crucial for interfacing high-voltage power systems with Littelfuse SE-330, SE-325, SE-330AU, and SE-330HV series relays. Its primary function is to safely reduce hazardous system voltages to levels compatible with these monitoring relays, enabling accurate data acquisition for protection and control systems. The ER-25KV is an indispensable component for Neutral Earthing Resistor (NER) monitoring systems, facilitating precise measurement and early detection of ground faults. By providing accurate voltage signals, it helps prevent catastrophic equipment failures and ensures the continuous operation of critical infrastructure, such as utility substations and industrial power distribution networks. This accessory is a mandatory requirement for the SE-330, SE-325, SE-330AU, and SE-330HV monitoring solutions, ensuring their proper functionality. The robust design and precise electrical characteristics of the ER-25KV guarantee reliable voltage reduction, providing timely and accurate signals for protective actions. Designed for direct integration, it offers a safe and dependable pathway for voltage signal conditioning. Manufactured in the US, the ER-25KV has a UNSPSC code of 39122331. This accessory complements Littelfuse's range of medium voltage fuses, such as the E- and R-rated series (e.g., 25E1C15.5S, 40E1C25.8, 25E1C5.5, 15NLE25E, 65E2C25.8), which are designed for transformer, potential transformer, feeder, and motor circuit protection, offering various mounting configurations like conventional ferrule type, clip lock, and bolt-in for diverse application needs.
  • Sensing resistor accessory for systems up to 25 kV (non-continuous duty)
  • Interfaces with Littelfuse SE-330, SE-325, SE-330AU, and SE-330HV relays
  • Safely reduces hazardous system voltages to relay-compatible levels
  • Indispensable for Neutral Earthing Resistor (NER) monitoring systems
  • Robust design ensures accurate voltage signals for protective actions

Specifications

Application
NA
Brand Name
Littelfuse
Mounting Type
Direct integration
Series
ER
Special Features
Used On Systems Up To 25 kV
Standard
CSA, UL
Sub Brand
ER-25KV Series
Type
Protection Relay
Voltage Rating
25 kV
Package Weight (Imperial)
44.000 L
Package Weight (Metric)
20.000 kg
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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.