Littelfuse TRDU24A3 - 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

TRDU24A3

Alternate Item Number: TRDU24A3

UPC: 079458011807

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Minimum Qty: 10

Multiplier: 10

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Overview

The Littelfuse TRDU24A3 is a highly versatile and intelligent universal time delay relay designed to streamline control systems and reduce inventory in demanding industrial environments. This advanced unit from Littelfuse offers an impressive 21 selectable single and dual timing functions, providing unparalleled flexibility for a wide range of automation and control applications. The dual function capabilities are particularly noteworthy, as they can effectively replace up to three individual timers, significantly simplifying wiring, reducing panel space, and lowering overall system costs. Engineered for ease of use and precision, the TRDU24A3 features user-friendly switches directly on the unit's face for effortless selection of both the operational function and the desired timing range. This switch-selectable timing allows for precise adjustments across eight distinct ranges, spanning from 0.1 seconds to an extensive 1,705 hours, ensuring suitability for both rapid and long-duration timing requirements. The microcontroller-based design guarantees exceptional repeat accuracy of +/- 0.1%, critical for applications where consistent timing is paramount. Visual feedback is provided by two integrated LEDs, clearly indicating the presence of input voltage and the current status of the output relay. This enhances troubleshooting and operational monitoring. The TRDU24A3 is equipped with robust, isolated 10A relay output contacts, available in either DPDT (Double Pole Double Throw) or SPDT (Single Pole Double Throw) configurations, depending on the specific model. The 11-pin DPDT configuration of the TRDU24A3 offers maximum switching flexibility for controlling multiple circuits simultaneously. By consolidating the functionality of numerous single-purpose timers, the TRDU Series, including the TRDU24A3, dramatically reduces the number of part numbers required in stock. This inventory reduction translates directly into cost savings and simplified procurement processes for maintenance and engineering teams. Littelfuse is a globally recognized leader in circuit protection and switching solutions, and the TRDU Series exemplifies their commitment to providing reliable, high-performance components for industrial automation, process control, motor control, and general machinery applications. Key Features and Benefits: * **21 Selectable Timing Functions:** Offers extensive versatility with both single and dual function modes, capable of replacing multiple timers. * **User-Selectable Timing:** Easily set timing ranges from 0.1s to 1,705h across eight distinct ranges via front-panel switches. * **High Repeat Accuracy:** Microcontroller-based design ensures precise timing with +/- 0.1% repeat accuracy. * **Robust 10A Output Contacts:** Isolated SPDT or DPDT contacts provide reliable switching for AC or DC loads. * **Dual LED Indicators:** Provide clear visual status for input voltage and output relay operation. * **Reduced Inventory:** Replaces hundreds of part numbers, simplifying stock management and reducing costs. * **11-Pin DPDT Configuration:** Offers comprehensive switching capabilities for complex control circuits. The TRDU24A3 is an ideal choice for applications requiring precise, repeatable timing control, offering a compact, efficient, and cost-effective solution for modern industrial control panels.
  • 21 selectable single and dual timing functions for maximum versatility.
  • User-selectable timing ranges from 0.1s to 1,705h via front-panel switches.
  • Microcontroller-based for high repeat accuracy of +/- 0.1%.
  • Isolated 10A DPDT output contacts for reliable load control.
  • Dual LED indicators for input voltage and output status 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
DPDT
Series
TRDU
Special Features
10Y WARR
Standard
CE/UR/CSA
Sub Brand
SSAC
Voltage Rating
24 VAC/DC
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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.