ASTUA3 - ASQU ASTU Series

Series: ASQU ASTU
Questions? Contact Littelfuse Support
External overview image
Roll Over to Zoom
Disclaimer Notice

Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

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 terminal and the ASTU Series has terminal blocks.

Check Stock Order Samples

Product Literature

For Technical Questions

Call +1 800-832-3873 or email us at relays@littelfuse.com 

Property (Mouseover for details) Value
Input Voltage (V) 24 or 240 V ac
Input Tolerance (%) -20% - 10%
Input AC Line Frequency (Hz) 50/60
Output Type Solid state
Output Form NO
Output Load Rating (VA) 0.7 A steady state; 10 A inrush
Output Voltage Drop (V) ≅2.5 V @ 0.7 A
Time Delay Type Microcontroller based with ceramic resonator and watchdog circuitry
Time Delay Range 0.1 - 10 s; 1 - 100 s; 10 - 1000 s; 1 - 100 m
Time Delay Tolerance (%) ±2% or ±50 ms whichever is greater
Reset Time (ms) ≤300
Initiate Time (ms) Single shot and delay-on-break: ≤32
Adjustment Type Knob with dial; 2 switches select 1 of 4 multipliers
Repeat Accuracy (%) ±1% or 50 ms whichever is greater
Setpoint vs Ambient Temperature and Operating Voltage (%) ≤±2% or 50 ms whichever is greater
Surge Protection IEEE C62.41-1991 Level A
Dielectric Breakdown ≥2000V terminals to mounting surface
Circuitry Encapsulated
Termination Type 0.197 in (5 mm) push-on terminal blocks for up to #14 AWG (2.5 mm²) wire
Mounting Method DIN rail: Snap on to 32 mm DIN 1 and 35 mm DIN 3 rail; Surface mount: 2 #6 (M3.5 x 0.6) screws or quick mount fasteners
Operating Temperature -40° to 60°C (-40° to 140°F)
Storage Temperature (F/C) -40° to 85°C (-40° to 185°F)
Humidity 95% relative : non-condensing
Weight (lbs/g) 0 Kg

To request product environmental information, please complete the Product Environmental Information Request Form.