Littelfuse TDS120AL - The TSD2 Series is designed for more demanding commercial and industrial applications where small size and accurate performance are required. The factory calibration for fixed time delays is within 1% of the target time delay. The repeat accuracy, under stable conditions, is 0.1% of the time delay. The TSD Series is rated to operate over an extended temperature range. Time delays of 0.1 seconds to 100 hours are available. The output is rated 1A steady and 10A inrush. The modules are totally solid state and encapsulated to protect the electronic circuitry. Operation (Interval): Upon application of input voltage, the time delay begins. The output is energized during the time delay. At the end of the time delay, the output de-energizes and remains de-energized until input voltage is removed. Reset: Removing input voltage resets the time delay and output.
Littelfuse

TDS120AL

Alternate Item Number: TDS120AL

UPC: 079458999891

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Minimum Qty: 10

Multiplier: 10

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Overview

The Littelfuse TSD120AL, part of the TSD2 Series, is a compact, solid-state interval timer designed for precise timing control in demanding commercial and industrial applications. This microcontroller-based unit offers exceptional accuracy, with factory calibration within ±1% of the target time delay and repeat accuracy of ±0.1% or 20ms (whichever is greater) under stable conditions. The TSD120AL supports a wide time delay range from 0.1 seconds to 100 hours, available in 7 adjustable ranges or fixed settings. It operates on input voltages of 24, 120, or 230VAC (±20% tolerance) at 50/60 Hz, consuming less than 2VA. The solid-state output is rated for 1A steady-state and 10A inrush at 60°C, providing a typical operational life of 100 million cycles. Its encapsulated design protects the electronic circuitry against shock, vibration, and humidity up to 95% non-condensing, while offering dielectric breakdown resistance of ≥ 2000V RMS between terminals and the mounting surface. Operating reliably across an extended temperature range of -40°C to 75°C, the TSD120AL is ideal for process control, motor sequencing, lighting control, and HVAC systems where accurate, repeatable timing is critical. The interval operation energizes the output during the time delay and de-energizes upon completion, resetting only when input voltage is removed. Measuring 50.8mm x 50.8mm x 30.7mm and weighing approximately 68g, it mounts via a single #10 screw and terminates with 0.25in (6.35mm) male quick-connect terminals. Compatible accessories for remote adjustment include the Versa-Pot potentiometer (P1004-95) and Versa-Knob (P0700-7).
  • Microcontroller-based for precise timing control
  • Factory calibrated to ±1% and repeat accuracy of ±0.1% or 20ms
  • Wide time delay range: 0.1 seconds to 100 hours
  • Solid-state output: 1A steady, 10A inrush
  • Encapsulated design for protection against environmental factors

Specifications

Brand Name
Littelfuse
Current Rating
1A steady, 10A inrush
Material
Solid-state, encapsulated
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
Series
TSD2
Series
TSD2 Series
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.