Littelfuse TDM230AL - The TDM/TDMH/TDML Series is a delay-on-make timer that combines accurate digital circuitry with isolated, DPDT relay contacts in an industry standard 8-pin plug-in package. DIP switch adjustment allows precise selection of the time delay over the full time delay range. The TDM/TDMH/TDML Series is the product of choice for custom control panel and OEM designers. 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 relay energizes and remains energized until input voltage is removed. Reset: Removing input voltage resets the time delay and output.
Littelfuse

TDM230AL

Alternate Item Number: TDM230AL

UPC: 079458999648


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Minimum Qty: 10

Multiplier: 10

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Overview

The Littelfuse TDM230AL is a dedicated delay-on-make timer from the TDM/TDMH/TDML Series, engineered for precise timing control in industrial automation, OEM applications, and custom control panels. This 230V AC unit combines accurate digital circuitry with isolated, DPDT relay contacts rated for 10A switching capability across both AC and DC loads. Housed in an industry-standard 8-pin plug-in package, the TDM230AL ensures easy installation and seamless replacement in existing systems. Operation is straightforward: upon application of input voltage, the time delay begins, with the output relay remaining de-energized. Once the selected delay elapses (1 to 1023 seconds in 1-second increments), the output relay energizes and remains active until input voltage is removed, at which point the timer resets. Precise time delay selection is achieved via user-friendly DIP switches, allowing fine-tuning for optimal performance in specialized equipment. The microcontroller-based design delivers exceptional repeat accuracy of +/- 0.1% and first-time setting accuracy of +/- 2%, ensuring consistent and reliable operation. An integrated LED provides clear visual indication of the time delay status. Compatible with Littelfuse octal sockets such as the OT08PC and P1011-6, and mountable on 35mm DIN rail using accessories like the C103PM (AL), the TDM230AL offers flexible integration into various control systems. Typical applications include motor control, process sequencing, and safety interlocks where timed activation is required after power application. With UL-listed components and a robust design, the TDM230AL is a reliable choice for engineers and designers seeking accurate, dependable delay-on-make functionality.
  • 230V AC input voltage with isolated DPDT relay contacts rated 10A
  • Adjustable time delay from 1 to 1023 seconds in 1-second increments via DIP switches
  • Microcontroller-based design with repeat accuracy +/- 0.1% and setting accuracy +/- 2%
  • LED indication for visual status of time delay and relay output
  • Compatible with Littelfuse octal sockets and mountable on 35mm DIN rail

Specifications

Brand Name
Littelfuse
Connection Type
8-pin plug-in
Current Rating
10 A
Mounting
Plug-in socket Mount
Mounting Type
35mm DIN Rail (with accessories)
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
TDM/TDMH/TDML Series
Series
TDM/TDMH/TDML
Special Features
10Y WARR
Standard
CE/UR/CSA/UL
Sub Brand
SSAC
Voltage Rating
230 V AC
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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.