Littelfuse LDRSF21 - DC SWITCH PHASE BARRIER D
Littelfuse

LDRSF21

UPC: 079458266580

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Specification Sheet

Contact for Pricing

Overview

The **Littelfuse LDRSF21 DC Switch Phase Barrier D** is a high-performance electrical isolation component engineered to safeguard industrial power distribution systems, control panels, and machinery from hazardous phase-to-phase and phase-to-ground faults. Designed for **reliable electrical isolation and protection**, this phase barrier ensures operational safety and efficiency in demanding industrial environments where electrical faults can lead to costly downtime, equipment damage, or safety hazards. As part of Littelfuse’s **LDRSF series**, the LDRSF21 delivers robust performance with superior insulation properties, making it an ideal choice for engineers, electricians, and maintenance professionals seeking dependable protection solutions. **Key Features and Benefits:** - **Superior Electrical Isolation:** The LDRSF21 provides effective phase-to-phase and phase-to-ground fault prevention, reducing the risk of short circuits and electrical fires in industrial applications. Its high-quality insulation materials ensure long-term reliability, even in harsh operating conditions. - **Compact and Easy to Install:** With a space-efficient design, the LDRSF21 integrates seamlessly into existing power distribution systems, control panels, and machinery. Its modular form factor simplifies installation, minimizing downtime during retrofits or new installations. - **Durable Construction:** Built to withstand industrial environments, the phase barrier features robust materials that resist corrosion, vibration, and mechanical stress. This durability translates to extended service life and reduced maintenance costs. - **Enhanced Safety Compliance:** The LDRSF21 meets stringent electrical safety standards, making it suitable for applications requiring compliance with industry regulations such as **IEC, UL, or NEC**. Its design aligns with best practices for electrical safety in industrial settings. - **Versatile Applications:** From **power distribution systems** and **motor control centers** to **renewable energy installations** and **automation equipment**, the LDRSF21 is a versatile solution for protecting critical electrical components. It is particularly well-suited for use in **manufacturing plants, data centers, mining operations, and oil & gas facilities**, where electrical reliability is paramount. **Why Choose Littelfuse?** Littelfuse is a globally recognized leader in electrical protection, surge suppression, and circuit protection solutions, with over a century of innovation and expertise. The company’s **LDRSF series** reflects its commitment to delivering high-quality, reliable products that meet the evolving needs of industrial applications. Professionals trust Littelfuse for its **engineering excellence, rigorous testing, and adherence to industry standards**, ensuring that products like the LDRSF21 provide uncompromising performance and safety. **Applications and Industry Use Cases:** - **Power Distribution Systems:** Protects transformers, switchgear, and distribution panels from electrical faults. - **Control Panels:** Safeguards sensitive control circuits in automation and process control systems. - **Industrial Machinery:** Prevents phase-to-ground faults in motors, drives, and heavy equipment. - **Renewable Energy:** Ensures safe operation in solar and wind power systems by isolating phases in inverters and converters. - **Harsh Environments:** Ideal for mining, oil & gas, and chemical processing, where exposure to dust, moisture, and extreme temperatures is common. **Installation and Maintenance Considerations:** The LDRSF21 is designed for straightforward installation, with clear labeling and mounting options to simplify integration into existing systems. Regular inspections and adherence to manufacturer guidelines ensure optimal performance and longevity. Littelfuse provides comprehensive technical support and documentation to assist professionals in selecting, installing, and maintaining the LDRSF21 for maximum reliability. For engineers and procurement specialists seeking a **trusted, high-performance phase barrier** that enhances safety and operational efficiency, the **Littelfuse LDRSF21 DC Switch Phase Barrier D** is the ideal solution. Its combination of **durability, ease of installation, and superior electrical isolation** makes it a cornerstone component in modern industrial electrical protection strategies.
  • Reliable electrical isolation for phase-to-phase and phase-to-ground fault prevention
  • Compact, easy-to-install design for seamless integration into existing systems
  • Durable construction resistant to corrosion, vibration, and mechanical stress
  • Meets stringent safety standards (IEC, UL, NEC) for industrial compliance
  • Versatile applications in power distribution, control panels, and industrial machinery

Specifications

Material
High-quality insulation materials
Series
LDRSF
Power supply for DIN-rail

PS-60

Power supply for DIN-rail
N3 SCREW COVER - 10X10X6 - GRA

C3SC10106GY

N3 SCREW COVER - 10X10X6 - GRA
ACS380 AC Drive, 3-380-480V In, 3HP, 6A, Type OPEN, 1.5 overload, Integrated, HxWxD 6.69x2.76x7.52 in, Module

ACS380-040S-07A2-4

ACS380 AC Drive, 3-380-480V In, 3HP, 6A, Type OPEN, 1.5 overload, Integrated, HxWxD 6.69x2.76x7.52 in, Module
BK63H 1P B2A 10kA 120/240VAC UL1077

0626030563

BK63H 1P B2A 10kA 120/240VAC UL1077
MC-50a AC120V 50/60Hz SCREW 1a1b (Metasol) EXP (MC50A-30-11-K7-S-E)

1338006700

MC-50a AC120V 50/60Hz SCREW 1a1b (Metasol) EXP (MC50A-30-11-K7-S-E)
GMD-16M DC240V 3W 1b EXP (GMD16M-30-01-UD-3W-S-E)

1270040900

GMD-16M DC240V 3W 1b EXP (GMD16M-30-01-UD-3W-S-E)
Combine high performance with compact dimensions: - 1000 V AC / DC IEC 600 V UL, - Opt for the best marking visibility thanks to the up-front, flat marker zone, which lets you mark up to eight digits or increase the font size.

1SNK705010R0000

Combine high performance with compact dimensions: - 1000 V AC / DC IEC 600 V UL, - Opt for the best marking visibility thanks to the up-front, flat marker zone, which lets you mark up to eight digits or increase the font size.
Pushbuttons. 104P heavy duty Oiltight Pushbutton. Nameplate. XN1B PR.No. CR100699

CR104PXN1B

Pushbuttons. 104P heavy duty Oiltight Pushbutton. Nameplate. XN1B PR.No. CR100699
General Electric Control Products. Nema Power Devices. Ol Relay 610F8364

CR324E610F

General Electric Control Products. Nema Power Devices. Ol Relay 610F8364
C.BREAKER TMAX XT2N 125 UL/CSA FIXED THREE-POLE WITH FRONT TERMINALS AND THERMOMAGNETIC RELEASE TMA R 90 I3=450...900 A

XT2NU3090BFF000XXX

C.BREAKER TMAX XT2N 125 UL/CSA FIXED THREE-POLE WITH FRONT TERMINALS AND THERMOMAGNETIC RELEASE TMA R 90 I3=450...900 A
The NNC75X75WH2 Halogen-Free Wide Slot Wiring Duct is used to route, protect, and manage wires near sensitive electronic equipment and in environments where heat resistance or public safety is a concern. UL 94 flame class of V-0 with a UL recognized continuous-use temperature up to 95 C (203 F). Halogen-Free, Polyphenylene Oxide (PPO). Mounting holes provided. 2.85" x 2.97" (72.4 mm x 75.4 mm) and 6.6' (2 m) long. Cover included. Color White. 5 pieces per package.

NNC75X75WH2

The NNC75X75WH2 Halogen-Free Wide Slot Wiring Duct is used to route, protect, and manage wires near sensitive electronic equipment and in environments where heat resistance or public safety is a concern. UL 94 flame class of V-0 with a UL recognized continuous-use temperature up to 95 C (203 F). Halogen-Free, Polyphenylene Oxide (PPO). Mounting holes provided. 2.85" x 2.97" (72.4 mm x 75.4 mm) and 6.6' (2 m) long. Cover included. Color White. 5 pieces per package.
HPS Open Style Control Transformer, 150VA 240x480V-120x240V 50/60Hz

C2G0150MQMJ

HPS Open Style Control Transformer, 150VA 240x480V-120x240V 50/60Hz

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.