Littelfuse TDR4A23 The TDR Series of time-delay relays are comprised of digital circuitry and an isolated…

Name: Littelfuse TDR4A23 time-delay relay with 10A output, digital circuitry, and precise ON/OFF delay settings via binary switches for industr...
Brand: Littelfuse
SKU: TDR4A23
Availability: InStock

Alternate Item Number: TDR4A23

UPC: 079458999846

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Multiplier: 10

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Overview

The **Littelfuse TDR4A23 Time-Delay Relay** is a high-performance, digitally controlled industrial relay designed for precise timing control in automation, process control, and machinery applications. Engineered with robust digital circuitry and an isolated 10A relay output, this relay delivers reliable performance in demanding environments where accurate delay settings are critical. Unlike traditional electromechanical relays, the TDR4A23 leverages digital precision to eliminate drift and ensure consistent timing, making it ideal for applications requiring repeatable ON and OFF delays. This relay offers unparalleled flexibility with two 10-position binary switches, enabling users to configure delay times with granularity and repeatability. The **Recycling (ON Time First)** and **Recycling (OFF Time First)** modes provide versatility for a wide range of control schemes, allowing engineers to tailor the relay’s operation to specific system requirements. Whether managing sequential start-up delays, cyclic operation in conveyor systems, or timed safety interlocks, the TDR4A23 adapts seamlessly to diverse industrial needs. **Key Features and Benefits:** - **Digital Precision Timing:** The TDR4A23’s digital circuitry ensures stable, drift-free delay settings, eliminating the inaccuracies common in analog-based relays. This precision is essential for applications where timing consistency directly impacts process efficiency or safety. - **Isolated 10A Relay Output:** With a 10A output rating, this relay can directly control solenoids, motors, valves, and other inductive loads, reducing the need for additional switching components. The isolated output enhances system reliability by preventing ground loops and electrical interference. - **Dual Operating Modes:** The **ON Time First** and **OFF Time First** modes allow for flexible sequencing in automation systems. For example, **ON Time First** is ideal for delayed start-up sequences, while **OFF Time First** suits applications requiring timed shutdowns or periodic cycling. - **Visual Status Indicators:** Integrated green and red LEDs provide real-time feedback on relay status, power conditions, and timing cycles. This feature simplifies troubleshooting and system monitoring, reducing downtime in critical operations. - **Easy Reset and Integration:** The relay resets automatically when input voltage is removed, ensuring a clean restart for the next cycle. Its compact design and standard mounting options make it easy to integrate into control panels, PLC systems, or standalone applications. **Industry Applications:** The TDR4A23 is widely used in industries where precise timing is paramount, including: - **Manufacturing Automation:** Controlling sequential operations in assembly lines, such as delayed activation of actuators or timed clamping mechanisms. - **Process Control:** Managing batch processing, chemical dosing, or temperature cycling where ON/OFF delays must be tightly controlled. - **Material Handling:** Regulating conveyor systems, sorting machines, or automated storage systems with cyclic timing requirements. - **HVAC and Building Automation:** Coordinating equipment start-up/shutdown sequences to optimize energy efficiency and reduce wear on components. - **Safety and Interlock Systems:** Implementing timed delays in emergency shutdowns, fail-safe circuits, or access control systems to prevent hazardous conditions. **Why Choose Littelfuse?** Littelfuse is a global leader in circuit protection and industrial control solutions, trusted by engineers and OEMs for over a century. The company’s relays, including the TDR4A23, are renowned for their durability, accuracy, and compliance with international standards. With a focus on innovation and reliability, Littelfuse ensures that its products meet the rigorous demands of industrial environments, from extreme temperatures to high-vibration applications. The TDR4A23 exemplifies this commitment, offering a combination of precision, flexibility, and robustness that sets it apart in the time-delay relay market. **Installation and Selection Considerations:** When selecting a time-delay relay, professionals prioritize factors such as delay range, output capacity, and operating modes. The TDR4A23 addresses these needs with its **10-position binary switches**, which provide a delay range from 0.1 seconds to 100 seconds (typical for this series), allowing for fine-tuned control. Its **10A output** is sufficient for most industrial loads, while the **isolated relay** ensures compatibility with sensitive control circuits. For engineers designing new systems or retrofitting existing ones, the TDR4A23 offers a plug-and-play solution that minimizes wiring complexity and maximizes uptime. **Conclusion:** The **Littelfuse TDR4A23 Time-Delay Relay** is a versatile, high-performance solution for applications requiring precise and repeatable timing control. Its digital circuitry, dual operating modes, and robust output make it a preferred choice for automation engineers, system integrators, and maintenance professionals. By combining Littelfuse’s engineering expertise with a focus on reliability and flexibility, the TDR4A23 delivers the performance needed to optimize industrial processes, enhance safety, and reduce operational costs. Whether deployed in a new installation or as a replacement for outdated relays, this product stands as a testament to Littelfuse’s leadership in industrial control technology.

Digital circuitry for stable, drift-free delay settings
Isolated 10A relay output for direct load control
Dual operating modes: ON Time First and OFF Time First
Visual LED indicators for real-time status monitoring
Easy reset and integration into control systems

Specifications

Brand Name	Littelfuse
Current Rating	10 A
Mounting	Plug-in socket Mount
Number Of Poles	Plug-in socket
Operating Temperature	-20 to 60 F
Operating Temperature, Maximum	60 F
Operating Temperature, Minimum	-20 F
Series	TDR
Special Features	10Y WARR
Standard	CE/UR/CSA
Sub Brand	SSAC

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TDR4A22

The TDR Series of time-delay relays are comprised of digital circuitry and an isolated, 10A relay output. The ON and OFF delays are selected by means of two, ten position binary switches, which allow the setting of the desired delay to be precise every time. Operation (Recycling - ON Time First): Upon application of input voltage, the green LED glows, the output relay is energized, the red LED glows, and the T1 ON time begins. At the end of the ON time, the output de-energizes, the red LED turns OFF and the T2, OFF time begins. At the end of the OFF time, the output relay energizes and the cycle repeats as long as input voltage is applied. Reset: Removing input voltage resets the output and time delays, and returns the sequence to the first delay. Operation (Recycling - OFF Time First): Upon application of input voltage, the green LED glows, the T1 OFF time begins, the load is OFF. At the end of the OFF time, the T2 ON time begins, the load energizes, and the red LED glows. At the end of the ON time the load de-energizes and the red LED turns OFF. The cycle repeats until input voltage is removed. Reset: Removing input voltage resets the output and the sequence to the OFF time.

TR-6092U

THR-1 Time Delay Relays TR-6092U

1SVR500020R0000

The CT-MFD.12 is a multifunction electronic time relay from the CT-D timer range. It provides 7 timing functions with 7 time ranges from 0.05 s to 100 h. This time relay operates with a rated control supply voltage of 24 - 48 V DC / 24 - 240 V AC and has a 1 c/o (SPDT) output rated at 250 V / 4 A. A control input works with voltage-related (non-floating) triggering.

RTW17-DC02U030SE05

TIMING RELAY RTW17-DC02U030SE05 WEG specifications: Function Flasher; Output contacts 2 NO/NC; Timing 3-30s; Function complement Asymmetric start on; Control voltage 24-240V 50/60Hz/DC; A1-A2 terminals voltage 24-240 V 50/60Hz/DC

Frequently Asked Questions

What types of fuses does Littelfuse offer for industrial applications?

Littelfuse offers UL Class fuses, high-speed fuses, medium voltage fuses, 10 x 38 mm fuses, and solar fuses for industrial applications.

What are Littelfuse high-speed fuses used for?

High-speed fuses protect critical power semiconductor devices against short circuits in power conversion applications like inverters and variable-speed drives.

What applications are E-rated and R-rated medium voltage fuses for?

These fuses protect transformers, potential transformers, feeders, and motor circuits, with designs available for various current, voltage, and mounting configurations.

What are the voltage and amperage ranges for 10 x 38 mm fuses?

These fuses range from 125 to 1000 volts and 1/10 to 30 amperes, available in time-delay, fast-acting, board mount, or solar versions.

What is the maximum DC voltage for Littelfuse solar fuses?

Littelfuse offers solar fuses and holders up to 1500 Vdc for both high-current and low-current applications.

What conditions do Littelfuse feeder protection relays guard against?

These relays protect circuits from overcurrent, ground faults, phase loss, overload, and other detrimental conditions.

What is the Industrial Shock-Block® GFCI designed for?

It is designed for people protection in industrial facilities and meets UL Standard 943C Class C and Class D.

How do Littelfuse arc-flash protection relays work?

These relays detect a developing arc-flash incident and send a trip signal to interrupt power before significant damage occurs.

What types of motor protection does Littelfuse offer?

Littelfuse offers voltage monitors, current monitors, and Bluetooth-enhanced overload relays for low and medium voltage applications.

What technical support is available through Littelfuse Techline?

Techline experts can answer questions about product cross references, general technical information, engineering drawings, and application assistance.

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.