Star-delta Timer H3DT-G

New Value For Control Panels

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Time Ranges


Time range setting t1x1 t1x10
Star set time (t1) range 1 to 12 s 10 to 120 s
Star-Delta transfer time (t2) Select from 0.05, 0.1, 0.25, or 0.5 s.




Power supply voltage *1 24 to 240 VAC/DC, 50/60 Hz *2
Allowable voltage fluctuation range 85% to 110% of rated voltage
Power reset Minimum power-OFF time: 0.1 s
Reset voltage 10% of rated voltage
Power consumption H3DT-N2/-L2 At 240 VAC: 1.9 VA max., at 240 VDC: 0.6 W max., at 24 VDC: 0.3 W max.
Rated Insulation Voltage 250 V
Control output Contact output:
5 A at 250 VAC with resistive load (cosφ = 1),
5 A at 30 VDC with resistive load
0.15 A max at 125 VDC with resistive load,
0.1 A max at 125 VDC with L/R of 7 ms.
The minimum applicable load is 10 mA at 5 VDC (P reference value).
Contact materials: Ag-alloy
(Recommended fuse: BLN5 (Littelfuse) or 0216005MXEP)
Ambient operating temperature -20 to 60°C (with no icing)
Storage temperature -40 to 70°C (with no icing)
Surrounding air operating humidity 25% to 85%


*1.When using a 24-VDC power supply voltage, there will be an inrush current of approximately 0.5 A.
Allow for this inrush current when turning ON and OFF the power supply to the Timer with device with a solid-state output,
such as a sensor.
*2. DC ripple: 20% max.



Accuracy of operating time ±1% of FS max.
Setting error ±10% of FS ±0.05 s max.
Transfer time Total error ± (25% of transfer time + 5 ms) max.
Influence of voltage ±0.5% of FS max.
Influence of temperature ±2% of FS max.
Insulation resistance 100 MΩ min. at 500 VDC
Dielectric strength Between charged metal part and operating section: 2,900 VAC 50/60 Hz for 1 min.
Between control output terminals and operating circuit: 2,000 VAC 50/60 Hz for 1 min.
Between contacts not located next to each other: 1,000 VAC 50/60 Hz for 1 min.
Impulse withstand test
5 kV between power terminals, 7.4 kV between conductor terminal and operating section
Noise immunity Square-wave noise generated by noise simulator (pulse width: 100 ns/1 μs,
1-ns rise): ±1.5 kV
Static immunity Malfunction: 4 kV, Destruction: 8 kV
Destruction 0.75-mm single amplitude at 10 to 55 Hz for 2 h each in 3 directions
Malfunction 0.5-mm single amplitude at 10 to 55 Hz for 10 min each in 3 directions
Destruction 1,000 m/s2 3 times each in 6 directions
Malfunction 100 m/s2 3 times each in 6 directions
Mechanical 10 million operations min. (under no load at 1,800 operations/h)
Electrical 100,000 operations min. (5 A at 250 VAC, resistive load at 360 operations/h)
Degree of protection IP30 (Terminal block: IP20)
Weight Approx. 100 g


Relation between H3DT Ambient Temperature and Mounting Interval (Reference Values)

The relation between the ambient temperature and mounting interval is shown in the following graph.
If the Timer is used at 55°C or higher with a mounting interval that is smaller than that shown in the following diagram, the temperature inside the Timer will increase, reducing the life expectancy of internal parts.

H3DT-G Specifications 5

Applicable standards


Safety standards cULus: UL 508/CSA C22.2 No. 14
EN 61812-1: Pollution degree 2, Overvoltage category III
CCC: GB/T 14048.5 Pollution degree 2, Overvoltage category III *
LR: Category ENV1.2
EMC (EMI) EN 61812-1
Radiated Emissions: EN 55011 class B
Emission AC Mains: EN 55011 class B
Harmonic Current: EN 61000-3-2
Voltage Fluctuations and Flicker: EN 61000-3-3
(EMS) EN 61812-1
Immunity ESD: EN 61000-4-2
Immunity RF-interference: EN 61000-4-3
Immunity Burst: EN 61000-4-4
Immunity Surge: EN 61000-4-5
Immunity Conducted Disturbance: EN 61000-4-6
Immunity Voltage Dip/Interruption: EN 61000-4-11


* CCC certification requirements


Rated operating voltage Ue
Rated operating current Ie
AC-15: Ue: 250 VAC, Ie: 3 A
AC-13: Ue: 250 VAC, Ie: 5 A
DC-13: Ue: 30 VDC, Ie: 0.1 A
Rated impulse withstand voltage
(altitude: 2,000 m max.)
4 kV (at 240 VAC)
Conditional short-circuit current 1,000 A




Input None
Output Control output The star output is turned OFF when the dial set value is reached and the delta output is
turned ON after the preset transfer time elapses.


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