Littelfuse ASQUD3 - The ASQU and ASTU Series of 17.5 mm, knob adjustable, universal solid-state timers offer multiple functions, voltages, and time delay ranges. Choose one of 5 functions and 4 time delay ranges via 4 selection switches located on face of the unit. Adjustment through the time range is accomplished by an onboard knob. The ASQU Series has quick connect terminals and the ASTU Series has terminal blocks.
Littelfuse

ASQUD3

Alternate Item Number: ASQUD3

UPC: 079458991536


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Overview

The Littelfuse ASQUD3 (SKU: ASQUD3) is a 17.5mm knob-adjustable universal solid-state timer engineered for precise timing control in industrial automation, motor control, and process automation systems. This compact timer delivers exceptional flexibility with five selectable timing functions (Delay-on-Make, Single Shot/Interval, Recycling, and Delay-on-Break) and four adjustable time delay ranges (0.1s to 100 minutes) via four onboard switches. The onboard knob enables field-adjustable time delays with a repeat accuracy of +/- 1%, ensuring consistent performance in critical applications. Designed for universal DC operation (9-110VDC), the ASQUD3 eliminates inventory complexity by supporting a broad voltage range, reducing the need for multiple part numbers. Its 17.5mm slim profile maximizes control panel rail density, making it ideal for space-constrained installations. The solid-state output delivers 0.7A steady current and 10A inrush capacity, rated for 100 million operations under typical conditions. Integrated watchdog circuitry provides self-monitoring and self-correction for enhanced reliability. Quick connect terminals enable rapid installation and maintenance, while included mounting hardware supports both surface and DIN rail configurations. Optional insulated female quick connect terminals (P1015-13, P1015-64, P1015-14) are available for strain relief. The ASQUD3 is optimized for applications including conveyor systems, pump sequencing, lighting control, HVAC, and general process automation where accurate, repeatable timing is essential. Its microcontroller-based platform ensures long-term stability and minimal drift, making it a dependable choice for industrial environments.
  • 5 selectable timing functions (Delay-on-Make, Single Shot, Recycling, Delay-on-Break)
  • Field-adjustable time delays from 0.1 seconds to 100 minutes
  • Universal DC voltage input (9-110VDC) for broad compatibility
  • 0.7A steady / 10A inrush solid-state output rated for 100M operations
  • Quick connect terminals with included surface and DIN rail mounting hardware
  • Microcontroller-based for +/- 1% repeat accuracy
  • 0.7A steady, 10A inrush solid-state output
  • Includes surface and DIN rail mounting adapters

Specifications

Brand Name
Littelfuse
Connection Type
Quick Connect Terminals
Current Rating
0.7A steady, 10A inrush
Mounting
Two base adaptors are available Mount
Mounting Type
Surface and DIN rail
Number Of Poles
Two base adaptors are available
Operating Temperature
-40 to 60 F
Operating Temperature, Maximum
60 F
Operating Temperature, Minimum
-40 F
Series
ASQU
Series
ASQU Series
Size
17.5 mm
Special Features
10Y WARR
Standard
CE/UR/CSA
Sub Brand
SSAC
Voltage Rating
24-240VAC / 9-110VDC
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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.