Littelfuse TRDU120A2 - 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

TRDU120A2

Alternate Item Number: TRDU120A2

UPC: 079458011128

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Minimum Qty: 10

Multiplier: 10

*Contact for lower quantities*

Overview

The **Littelfuse TRDU120A2** is a high-performance universal time delay relay engineered to streamline industrial control systems with unparalleled flexibility and precision. Designed for engineers, system integrators, and maintenance professionals, this versatile relay replaces multiple single-function timers, significantly reducing inventory complexity and stocking requirements. With **21 selectable single and dual functions**, the TRDU120A2 eliminates the need for three or more dedicated timers, simplifying system design while enhancing operational reliability. This makes it an ideal solution for applications where space, cost, and versatility are critical considerations. At the core of the TRDU120A2 is a **microcontroller-based architecture**, delivering exceptional repeat accuracy of ±0.1%, ensuring consistent performance in demanding industrial environments. The timing range is fully adjustable via intuitive front-panel switches, covering eight selectable ranges from **0.1 seconds to 1,705 hours**, providing the flexibility needed for both short-cycle and long-duration processes. Whether controlling motor starters, conveyor systems, lighting circuits, or HVAC equipment, this relay adapts effortlessly to diverse timing requirements without the need for external timing modules. The TRDU120A2 features **full 10A isolated relay output contacts** in an SPDT configuration, enabling reliable switching of AC or DC loads up to 10A. This robust output capability makes it suitable for controlling solenoids, contactors, relays, and other inductive or resistive loads commonly found in industrial automation, process control, and machinery applications. Two **dual-color LEDs** provide clear visual feedback: one indicates input voltage presence, while the other shows relay output status, simplifying troubleshooting and commissioning. Installation and integration are straightforward thanks to the **8-pin SPDT plug-in design**, which supports both DIN rail and surface mounting via the NDS-8 octal socket. Littelfuse offers a full suite of accessories, including hold-down clips (PSC8) and front-panel mount kits (BZ1), ensuring secure and vibration-resistant installation in any orientation. The relay’s compact footprint and compatibility with standard industrial mounting systems make it an excellent choice for retrofitting existing panels or designing new control enclosures. Littelfuse, a global leader in circuit protection and industrial control solutions, has built a reputation for delivering high-quality, reliable components trusted by professionals worldwide. The TRDU Series exemplifies this commitment, offering a **versatile, cost-effective, and space-saving alternative** to traditional timer-based control systems. By consolidating multiple timing functions into a single device, the TRDU120A2 not only reduces inventory overhead but also minimizes wiring complexity, lowering both material and labor costs. Whether deployed in **automation systems, material handling, packaging machinery, or building management systems**, this relay enhances system efficiency, reduces downtime, and improves overall operational control. For engineers seeking a **future-proof timing solution**, the TRDU120A2 provides the flexibility to adapt to evolving application requirements without the need for hardware changes. Its **user-selectable functions and timing ranges** allow for quick reconfiguration in the field, while the isolated relay contacts ensure compatibility with a wide range of control voltages and load types. Backed by Littelfuse’s industry-leading technical support and global distribution network, the TRDU120A2 is more than just a timer—it’s a strategic investment in system reliability and scalability.
  • 21 selectable single and dual timing functions replace multiple timers
  • Microcontroller-based design ensures ±0.1% repeat accuracy
  • Adjustable timing range from 0.1s to 1,705 hours across eight ranges
  • 10A isolated SPDT relay output for reliable AC/DC load switching
  • Front-panel switches and dual LED indicators for easy setup and 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
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.