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Littelfuse SE-330AU-21-01 - SE-330AU-21-01 is an advanced neutral-earthing resistor monitor with a supply voltage ac of 28–52 and a supply voltage dc of 36–72. Network communications is offered via USB; DeviceNet.
Littelfuse

SE-330AU-21-01

Alternate Item Number: SE-330AU-21-01

UPC: 079458988727


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Overview

The Littelfuse SE-330AU-21-01 stands as a sophisticated and advanced neutral-earthing resistor (NER) monitor, engineered to provide critical oversight and control within industrial power systems. Designed for demanding environments, this unit ensures the integrity and safety of electrical networks by meticulously monitoring the performance of neutral-earthing resistors. Its robust design and advanced capabilities make it an indispensable component for maintaining stable and reliable power distribution. With a versatile supply voltage range, the SE-330AU-21-01 accommodates both AC and DC power sources, operating effectively between 28–52 VAC and 36–72 VDC. This broad operational window allows for seamless integration into a wide array of existing infrastructure and new installations, offering flexibility and broad applicability across different industrial sectors. The device's primary function is to detect deviations or failures in the neutral-earthing resistor, which is crucial for preventing overvoltages and ensuring the safety of personnel and equipment during ground faults. Connectivity is a cornerstone of the SE-330AU-21-01's advanced functionality. It offers dual network communication options: USB for direct, localized monitoring and configuration, and DeviceNet for integration into larger industrial automation networks. This dual-interface capability facilitates efficient data acquisition, remote diagnostics, and centralized control, aligning with the needs of modern smart factories and sophisticated power management systems. The DeviceNet protocol, in particular, is widely adopted in industrial automation for its robust, multi-master capabilities and ease of integration. Key features and benefits of the Littelfuse SE-330AU-21-01 include: * **Precise Monitoring:** Continuously tracks the resistance values of the neutral-earthing resistor, providing real-time status updates. * **Wide Voltage Compatibility:** Operates with supply voltages of 28–52 VAC and 36–72 VDC, ensuring broad application suitability. * **Dual Network Communication:** Supports both USB and DeviceNet for flexible data exchange and network integration. * **Enhanced Safety:** Aids in the prevention of dangerous overvoltages and protects equipment during ground fault conditions. * **Reliable Performance:** Built by Littelfuse, a trusted leader in circuit protection and power control solutions, guaranteeing quality and durability. The SE-330AU-21-01 is ideally suited for applications in power generation, heavy manufacturing, data centers, and any industrial setting where reliable grounding and fault detection are paramount. Its ability to provide early warnings of potential issues helps to minimize downtime, reduce maintenance costs, and enhance overall operational safety. Professionals in electrical engineering and plant maintenance will find the SE-330AU-21-01 to be a valuable tool for ensuring the continuous and safe operation of their critical power infrastructure. The Littelfuse brand is synonymous with quality and innovation in electrical protection, making the SE-330AU-21-01 a dependable choice for mission-critical applications.
  • Advanced neutral-earthing resistor monitoring for industrial power systems
  • Wide supply voltage range: 28–52 VAC and 36–72 VDC
  • Network communication via USB and DeviceNet for seamless integration
  • Enhances system stability and safety by detecting ground fault conditions
  • Manufactured by Littelfuse, a trusted leader in circuit protection

Specifications

Application
Low- and medium-voltage transformers and generators
Brand Name
Littelfuse
Special Features
Continuous NGR monitoring
Sub Brand
SE 330 Series
Type
Neutral-grounding resistor monitor
Voltage Rating
28–52 V AC / 36–72 V DC
Package Dimensions (L x W x H)
5.8 IN x 3.9 IN x 8.4 IN
Package Dimensions (L x W x H)
14.732 cm x 9.906 cm x 21.336 cm
Package Weight (Imperial)
4.400 L
Package Weight (Metric)
2.000 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.