Littelfuse TRDU120A1 - The TRDU Series is a versatile universal time delay relay with 21 selectable single and dual functions. The dual functions replace up to three timers required to accomplish the same function. Both the function and the timing range are selectable with switches located on the face of the unit. Two LED's indicate input voltage and output status. This device offers full 10A isolated relay output contacts in either SPDT or DPDT. The TRDU replaces hundreds of part numbers, thereby, reducing your stock inventory requirements. 21 Functions: Five switches are provided to set one of 10 single or 11 dual modes of operation. See datasheet for a complete list of singe and dual functions.
Littelfuse

TRDU120A1

Alternate Item Number: TRDU120A1

UPC: 079458011111

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Minimum Qty: 10

Multiplier: 10

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Overview

The Littelfuse TRDU120A1 Universal Time Delay Relay (SKU: TRDU120A1) stands as a highly versatile and indispensable component for modern industrial automation and control systems. Engineered by Littelfuse, a trusted name in circuit protection and control, this time delay relay offers unparalleled flexibility with its 21 selectable single and dual functions. This advanced capability allows a single TRDU120A1 unit to replace multiple single-function timers, significantly streamlining panel design, reducing wiring complexity, and minimizing the potential for errors. The dual function modes are particularly impactful, capable of performing the work of up to three conventional timers, thereby offering substantial cost savings and inventory reduction for businesses. Installation and configuration of the TRDU120A1 are designed for ease of use and efficiency. Both the operational function and the timing range are intuitively selectable via robust switches conveniently located on the front panel. This user-friendly interface ensures that engineers and technicians can quickly set up the relay to meet specific application requirements without the need for specialized programming tools. For enhanced operational visibility and diagnostics, the unit features two integrated LEDs. One LED provides a clear indication of input voltage presence, confirming power to the device, while the second LED signals the status of the output contacts, allowing for immediate confirmation of relay operation. This real-time feedback is crucial for troubleshooting and maintaining system uptime. The TRDU120A1 is built to handle demanding industrial environments, offering a full 10A isolated relay output. This robust current handling capability, available in either Single Pole Double Throw (SPDT) or Double Pole Double Throw (DPDT) configurations, ensures compatibility with a wide range of loads, from small control circuits to moderately sized motor loads. The isolated nature of the contacts prevents interference between circuits, enhancing system reliability. By consolidating numerous part numbers into a single, adaptable solution, the TRDU120A1 directly addresses the challenge of managing extensive spare parts inventories. This reduction in stock-keeping units (SKUs) translates into lower carrying costs and improved operational efficiency for maintenance and procurement departments. Key features and benefits of the Littelfuse TRDU120A1 include: * **21 Selectable Functions:** Offers 10 single and 11 dual modes of operation, providing exceptional application flexibility. * **Inventory Reduction:** Replaces hundreds of traditional timer part numbers, significantly lowering stock requirements. * **Simplified Configuration:** Easy-to-use front-panel switches for function and timing range selection. * **Dual Functionality:** Dual modes can replace up to three individual timers, optimizing panel space and complexity. * **Robust Output:** 10A isolated relay output contacts available in SPDT or DPDT configurations. * **Diagnostic LEDs:** Two LEDs indicate input voltage and output status for clear operational monitoring. This time delay relay is an ideal choice for a multitude of industrial applications, including: * **Motor Control:** Sequencing motor starts, providing timed delays for pump or fan operation. * **Process Automation:** Controlling timed sequences in manufacturing lines, batch processing, and material handling. * **Machinery Control:** Implementing timed operations for conveyors, actuators, and other automated equipment. * **HVAC Systems:** Managing timed cycles for heating, ventilation, and air conditioning equipment. * **General Purpose Timing:** Any application requiring precise and reliable time-based control. When selecting a time delay relay, professionals prioritize reliability, ease of integration, and functional versatility. The Littelfuse TRDU120A1 excels in all these areas, backed by the reputation of Littelfuse for producing high-quality, dependable industrial components. Its ability to adapt to various timing needs makes it a future-proof solution for evolving automation requirements. The UNSPSC code for this product is 39122329, categorizing it within the industrial control and automation sector.
  • 21 selectable single and dual time delay functions for maximum versatility.
  • Replaces multiple timers, significantly reducing inventory and panel space.
  • Easy front-panel selection of function and timing range via switches.
  • 10A isolated relay output contacts in SPDT or DPDT configurations.
  • Dual LEDs indicate input voltage and output status for operational monitoring.

Specifications

Brand Name
Littelfuse
Current Rating
10 A
Mounting
Plug-in socket Mount
Number Of Poles
Plug-in socket
Operating Temperature
-20 to 65 F
Operating Temperature, Maximum
65 F
Operating Temperature, Minimum
-20 F
Poles
SPDT or DPDT
Poles
SPDT/DPDT
Series
TRDU
Special Features
10Y WARR
Standard
CE/UR/CSA
Sub Brand
SSAC
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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.