ASQUD3 - ASQU / ASTU Series

Littelfuse Multifunction Relays
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.

Property (Mouseover for details) Value
Input Voltage (V) 9 to 110VDC 9.4 to 110VDC 120 or 230VAC
Input Tolerance (%) 9 to 110VDC: -0% - 20% @-25oC; 9.4 to 110VDC: -0% - 20% @ -40oC 120 or 230VAC
Input DC Ripple (%) ≤10%
Output Type Solid state
Output Form NO
Output Load Rating (VA) 0.7A steady state 10A inrush
Output Voltage Drop (V) ≅1.5V @ 0.7A
Time Delay Type Microcontroller based with ceramic resonator and watchdog circuitry
Time Delay Range 0.1-10s; 1-100s; 10-1000s; 1-100m
Time Delay Tolerance (%) ±2% or ±50ms whichever is greater
Reset Time (ms) ≤300ms
Initiate Time (ms) Single shot and delay-on-break: ≤32ms
Adjustment Type Knob with dial; 2 switches select 1 of 4 multipliers
Repeat Accuracy (%) ±1% or 50ms whichever is greater
Setpoint vs Ambient Temperature and Operating Voltage (%) ≤ ±2% or 50ms whichever is greater
Surge Protection IEEE C62.41-1991 Level A
Dielectric Breakdown ≥2000V RMS terminals to mounting surface
Circuitry Encapsulated
Polarity DC units are reverse polarity protected
Termination Type 0.25 in. (6.35mm) male quick connect terminals
Mounting Method DIN rail: Snap on to 32mm DIN 1 and 35mm DIN 3 rail; Surface mount: Two #6 (M3.5 x 0.6) screws or quick mount fasteners
Operating Temperature -40° to 60°C (-40°F to 140°F)
Storage Temperature (F/C) -40° to 85°C (-40°F to 185°F)
Humidity 95% relative non-condensing
Weight (lbs/g) ≅4.0oz (113g)
Sample capable No