Littelfuse TDU3001A - The TDU Series are encapsulated solid-state, delay-on-make timers that combine digital timing circuitry with universal voltage operation. The TDU offers DIP switch adjustment allowing accurate selection of the time delay over the full time delay range. This series is an excellent choice for process control systems and OEM equipment. Operation (Delay-on-Make): Upon application of input voltage, the time delay begins. The output is de-energized before and during the time delay. At the end of the time delay, the output energizes and remains energized until input voltage is removed. Reset: Removing input voltage resets the time delay and output.
Littelfuse

TDU3001A

Alternate Item Number: TDU3001A

UPC: 079458999983

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Overview

The **Littelfuse TDU3001A** is a high-performance, encapsulated solid-state delay-on-make timer engineered for industrial automation, process control systems, and OEM equipment. Designed with universal voltage operation (100-240VAC/DC), this timer delivers exceptional flexibility, accommodating a wide range of input power requirements without the need for additional voltage converters or transformers. Its **DIP switch adjustment** enables precise, first-time configuration of time delays across the full range (1-1023 seconds), eliminating the need for external potentiometers or complex programming, which significantly reduces setup time and potential errors in industrial environments. Built with **totally solid-state and encapsulated construction**, the TDU3001A ensures long-term reliability by eliminating moving parts that can wear out or arc over time. This design also provides robust protection against shock, vibration, and humidity, making it ideal for harsh industrial conditions where reliability is critical. The **repeat accuracy of +/- 0.5% or 20ms (whichever is greater)** ensures consistent performance, even in applications requiring tight timing tolerances, such as conveyor systems, motor control, or automated testing equipment. The **delay-on-make operation** of the TDU3001A begins timing immediately upon application of input voltage, keeping the output de-energized until the preset delay period elapses. Once the delay completes, the output energizes and remains active until the input voltage is removed, at which point the timer resets automatically. This behavior is particularly useful in applications where delayed activation of machinery or processes is required to ensure safety, synchronization, or operational efficiency. For example, in **process control systems**, the TDU3001A can delay the start of a pump or valve until all upstream components are ready, preventing system overloads or damage. In **OEM equipment**, such as packaging machines or CNC systems, it can introduce precise delays to coordinate multiple operations, improving throughput and reducing cycle times. The TDU3001A is part of Littelfuse’s **TDU Series**, a trusted line of time delay relays known for their durability, accuracy, and ease of integration. Littelfuse, a global leader in circuit protection and industrial automation solutions, has built a reputation for delivering high-quality components that meet the demanding requirements of modern industrial applications. With **three time ranges available (0.1s to 2.8 hours)**, the TDU Series offers versatility to address a broad spectrum of timing needs, from milliseconds to minutes, without the need for multiple product variants. Installation and integration are streamlined thanks to the TDU3001A’s compact design and compatibility with standard mounting solutions. The module can be easily mounted on **35mm DIN rails** using the **P1023-20 DIN Rail Adapter**, or secured with the **P1023-6 Mounting Bracket** for flexible orientation. Wiring is simplified with **0.25-inch (6.35mm) female quick-connect terminals**, which support strain relief and reduce the risk of loose connections. For applications requiring screw terminals, the **P1015-18 Quick Connect to Screw Adapter** provides a seamless transition. Whether you're designing a new control panel, retrofitting existing equipment, or specifying components for an OEM application, the **Littelfuse TDU3001A** delivers the reliability, precision, and ease of use required to enhance operational efficiency and reduce downtime. Its **universal voltage operation, encapsulated construction, and DIP switch adjustability** make it a versatile choice for engineers and technicians seeking a dependable timing solution. Trusted by industry professionals worldwide, the TDU3001A is a proven performer in sectors such as **manufacturing, HVAC, water treatment, material handling, and renewable energy**, where accurate timing is essential for optimal performance.
  • Universal voltage operation (100-240VAC/DC) for flexible power compatibility
  • DIP switch adjustment for precise, first-time time delay configuration (1-1023 seconds)
  • Totally solid-state and encapsulated design for superior shock, vibration, and humidity resistance
  • Repeat accuracy of +/- 0.5% or 20ms (whichever is greater) for consistent performance
  • Compact, DIN rail-compatible design with easy installation and wiring options

Specifications

Brand Name
Littelfuse
Connection Type
0.25-inch (6.35mm) female quick-connect terminals
Material
Solid-state encapsulated
Material
Encapsulated solid-state
Mounting
Surface mount with one #10 (M5 x 0.8) screw Mount
Mounting Type
35mm DIN rail (with P1023-20 DIN Rail Adapter) or P1023-6 Mounting Bracket
Number Of Poles
Surface mount with one #10 (M5 x 0.8) screw
Operating Temperature
-40 to 60 F
Operating Temperature, Maximum
60 F
Operating Temperature, Minimum
-40 F
Series
TDU
Series
TDU Series
Special Features
10Y WARR
Standard
CE/UR/CSA
Sub Brand
SSAC
Voltage Rating
Universal (24-240VAC, 12-24VDC)
Voltage Rating
100-240VAC/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.