Littelfuse EFCT-2W/OFC - The EFCT series is a sensitive nickel-core current transformer used with Littelfuse relays to detect low levels of earth-leakage current.
Littelfuse

EFCT-2W/OFC

Alternate Item Number: EFCT-2W/OFC

UPC: 079458977738


Documents & Media
BrochureTechnical Bulletin

Contact for Pricing

Overview

The Littelfuse EFCT-2W/OFC is a highly sensitive nickel-core current transformer specifically engineered for the precise detection of low-level earth-leakage currents. This critical component is designed to integrate seamlessly with Littelfuse relays, forming a robust system for safeguarding electrical installations against ground faults. Its primary function is to monitor the residual current in a circuit, providing an early warning or tripping mechanism when leakage exceeds safe thresholds, thereby preventing equipment damage and ensuring personnel safety. The EFCT series, including the EFCT-2W/OFC, is built with a nickel-core construction, which offers superior magnetic properties for enhanced sensitivity. This allows for the detection of very small current imbalances that might otherwise go unnoticed by standard protection devices. Such sensitivity is paramount in applications where even minor earth leakage can pose significant risks, such as in sensitive electronic equipment, hazardous environments, or areas with strict safety regulations. Key features and benefits of the Littelfuse EFCT-2W/OFC include: * **High Sensitivity:** Optimized nickel core for detecting low earth-leakage currents. * **Reliable Integration:** Designed to work in conjunction with Littelfuse relays for comprehensive protection systems. * **Robust Construction:** Built for demanding industrial and commercial environments, ensuring long-term performance and durability. * **Safety Enhancement:** Crucial for preventing electrical hazards, fires, and equipment failures caused by ground faults. * **Versatile Application:** Suitable for a wide range of applications requiring precise earth-leakage monitoring. While specific current ratings and window sizes vary across the EFCT series, the core principle remains the same: providing accurate and reliable earth-leakage current detection. This transformer is an essential part of a proactive safety strategy, helping to maintain operational continuity and compliance with electrical safety standards. Professionals rely on Littelfuse for their expertise in circuit protection, and the EFCT series exemplifies this commitment to quality and performance. Its application extends to motor control centers, power distribution panels, and any system where the integrity of the electrical ground is critical. The ability to detect subtle current anomalies before they escalate into major faults makes the EFCT-2W/OFC an indispensable tool for modern electrical safety management.
  • Sensitive nickel-core current transformer for low earth-leakage detection
  • Designed for seamless integration with Littelfuse relays
  • Enhances electrical safety by detecting ground faults early
  • Robust construction for industrial and commercial applications
  • Provides reliable current monitoring for equipment and personnel protection

Specifications

Application
Industrial
Brand Name
Littelfuse
Material
Nickel-core
Series
EFCT
Special Features
High Quality
Sub Brand
Relay Series
Type
Protection Relays and Controls
Package Weight (Imperial)
6.600 L
Package Weight (Metric)
3.000 kg
RTXD Extractor Tool

6896057-1

RTXD Extractor Tool
Relay Accessories, Sockets & Clips, Printed Circuit Board, Phenolic, Printed Circuit Board, 6, Socket, Potter & Brumfield R10

1-1393143-3

Relay Accessories, Sockets & Clips, Printed Circuit Board, Phenolic, Printed Circuit Board, 6, Socket, Potter & Brumfield R10
Relay Accessories, Sockets & Clips, Solder, Polyester, Printed Circuit Board, 2, Socket, Potter & Brumfield R10

1-1393143-6

Relay Accessories, Sockets & Clips, Solder, Polyester, Printed Circuit Board, 2, Socket, Potter & Brumfield R10
Power supply for DIN-rail

PS-60

Power supply for DIN-rail
IP67 SCP-X Extreme Environment Series Power Supply. Double Stacked, Output Power 2 x 100W, Output Voltage 24 Vdc, Output Current 7.6 A total, 3.8 A per pair

SCP102D24X-C02

IP67 SCP-X Extreme Environment Series Power Supply. Double Stacked, Output Power 2 x 100W, Output Voltage 24 Vdc, Output Current 7.6 A total, 3.8 A per pair

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.