Star-Delta Analog Timers - AT8SDN

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220.00 Grams
Minimum Purchase:
1 unit


Autonics W48×H48 mm Star-Delta Analog Timers - AT8SDN

Relay, Power ON Start, 8-pin plug, Time setting

Autonics AT8SDN timer is an 8-pin socket type timer with an analog type dial for easy adjustments.

Universal power supply of 100-240 VAC ~, 24-240 VDC timer allows for flexibility in product use. A power on and output status LED easily verifies proper mode function.

This Timer provides:

  • Time setting operation method
  • STAR-DELTA output operation
  • POWER ON START time operation
  • 8-pin plug Terminal
  • 100-240 VAC ~, 24-240 VDC power supply
  • STAR contact: SPST (1a): 1, DELTA contact: SPST (1a): 1 Control output
  • Setting range: 0.5 to 5 sec, 1 to 10 sec, 5 to 50 sec, 10 to 100 sec
  • Easy to check output status by LED display
  • Simple setting time, switching time operation

Output Operation

The operating mode determines the output method that is used when the set time has reached. The AT8SDN has one output operating modes available:

  • STAR-DELTA: Star delta timer is an electronic timer which counts the time of its coil energize and trip the circuit when the time exceed presetting time. The timer is doing normal NO and NC operation.

Time operation

Time operation of AT8SDN is "POWER ON START" type. That means the time clocking starts when voltage is applied to the timer power supply section. This kind of timers are most often used for automated machines.

Setting range

The AT8SDN has 4 types of time ranges: 0.5 to 5 sec, 1 to 10 sec, 5 to 50 sec, 10 to 100 sec.


The terminal of this product is an 8-pin plug.

Control output

The AT8SDN has "relay" control output. it has 1 contacts which is STAR contact: SPST (1a): 1, DELTA contact: SPST (1a): 1 depending on output operation mode.


Different types of errors are specified for AT8SDN timer:

  • Repeat: ≤ ± 0.2% ± 10 ms
  • Voltage: ≤ ± 0.5%
  • Temp: ≤ ± 2%
  • Y setting time: ≤ ± 5% ± 50 ms
  • Y -∆switching time: ≤ ± 25%


There are limitations in temperature and humidity in which AT8SDN timer is used:

  • Ambient temperature: -10 … 55°C
  • Ambient humidity: 35 to 85%RH
  • Storage temperature: -25 … 65°C

Environment resistance is rated at no freezing or condensation.

 Application / industrial

  • Starting large capacity motor.


Click on the following link to view other Autonics Timers products.

Series Information

AT8SDN Series

Star-Delta Analog Timers

The Autonics AT8SDN series star-delta analog timers are ideal for starting high capacity motors with star-delta transition. Various time setting ranges and star-delta switching time can be configured easily with adjustment switches. LED start/delta operation indicators allow users to easily identify the operation status of the timers.

AT8SDN Series Main features

  • Ideal for starting high capacity motors
  • Various time setting range and star-delta switching time
          - T1 (time setting range): 0.5 to 100 seconds
          - T2 (star-delta switching time): 0.05/0.1/0.2/0.3/0.4/0.5 seconds
  • Simple time setting, time range, and output operation configuration with analog dial and switches
  • LED star/delta operation mode indicators
  • Power supply: 100-240VAC 50/60 Hz, 24-240VDC (AC/DC universal type)

About Autonics Timers

Autonics is a leading provider of automation solutions from South Korea. This company provides 15 timer series:

  • LE8N Series: Compact 8-digit LCD digital timers (indicator only)
  • LE3S Series: Thumbwheel switch LCD display digital timers
  • LE4S Series: LCD display digital timers
  • FSE Series: 8-pin plug type digital timers
  • LE7M-2 Series: Digital week/year timers
  • LE365S-41 Series: Compact digital week/year timers
  • ATM Series: Miniature analog timers
  • ATS Series: Compact multi-function analog timers
  • ATS8SD-4 Series: Compact star-delta analog timers
  • ATS8P Series: Compact power off delay analog timers
  • ATS8W/ATS11W series: Compact analog twin timers
  • ATN Series: Multi-function analog timers
  • AT8SDN Series: Star-delta analog timers
  • AT8PSN/AT8PMN Series: Power off delay analog timers
  • ATE8 Series: Simple operation analog timers

Autonics timers are mainly used in:

  • Automotive industry
  • Packaging industry
  • Elevator Industry
  • Plastics/Rubber industry
  • Semiconductor/Display
  • Food/Beverage industry
  • Machine Tools
  • Logistics
  • Medical/Pharmaceutical industry


Data Sheet

You may be searching for this product's catalog. If so, please click to view the AT8SDN datasheet.
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Warranty Information

One Year Warranty
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Additional Information

Star-delta timer.
Control time setting range:
0.5-100 sec.
Power supply:
100-240VAC 50/60Hz /24-240VDC universal.
Allowable voltage range:
90 to 110% of voltage rated.
Power consumption:
100-240VAC: 3.2VA: 24-240VDC: 1.5W.
Reset time:
Max 100ms.
Control output:
Contact type Star contact: SPST (1a), delta contact: SPST (1a).
Control output:
Contact capacity 250VAC, 5A resistive load.
Relay life cycle:
Mechanical Min. 10,000,000 operations.
Relay life cycle:
Electrical Min. 100,000 operations (250VAC, 5A resistive load).
Repeat error:
Max ±0.2%. ±10ms.
Star setting error:
Max ±5%. ±50ms.
Voltage error:
Max ±0.5%.
Temperature error:
Max ±2%.
Star-delta switching time error:
Max ±25%.
Insulation resistance:
100MΩ (at 500VDC megger).
Dielectric strength:
2000VAC 50/60Hz for 1 min.
Noise strength:
±2KV the square wave noise (pulse width: 1µs) by the noise simulator.
Mechanical 0.75mm Amp. at freq. 0f 10-55Hz (for 1min.) in each X, Y, Z directions for 1 hour.
Malfunction 0.5mm Amp. at freq. 0f 10-55Hz (for 1min.) in each X, Y, Z directions for 10 min.
Mechanical 300m/s2 (approx. 30G) in each X, Y, Z directions for 3 times.
Malfunction 100m/s2 (approx. 10G) in each X, Y, Z directions for 3 times.
Ambient temp. -10~55◦C, storage -25~65◦C.
Ambient humidity 25-85% HR, storage: 25-85% HR.
Unit weight:
Approx. 90g.
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