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Power OFF-delay Timer


Our Value Design Products Increase the Value of Your Control Panels. Set two time ranges with each Timer, from 0.1 to 12 seconds for the S Series and from 1.0 to 120 seconds for the L Series.

Time Ranges

S Series L Series
Time range setting x0.1 x1 x1 x10
Set time range 0.1 to 1.2 s 1 to 12 s 1 to 12 s 10 to 120 s
Power ON time 0.1 s min. 0.3 s min.
Scale numbers 12


Supply voltage H3DT-HCS/-HCL 100 to 120 VAC, 50/60 Hz
H3DT-HDS/-HDL 200 to 240 VAC, 50/60 Hz
H3DT-HBS/-HBL 24 to 48 VAC/DC, 50/60 Hz *1
Allowable voltage fluctuation range 85% to 110% of rated voltage
H3DT-HCS At 120 VAC: 8.7 VA max.
H3DT-HCL At 120 VAC: 8.8 VA max.
H3DT-HDS At 240 VAC: 21.6 VA max.
H3DT-HDL At 240 VAC: 21.7 VA max.
H3DT-HBS/-HBL At 48 VAC: 1.0 VA max., at 24 VDC: 0.4 W max.
Timer operation starting voltage 30% or less of power supply voltage
Rated Insulation Voltage 250 VAC
Control output Contact output, 5 A at 250 VAC with resistive load (cosφ = 1),
5 A at 30 VDC with resistive load
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%

* DC ripple: 20% max.


Accuracy of operating
±1% of FS max. (±1% ±10 ms max. at 1.2-s range)
Setting error ±10% of FS ±0.05 s max.
Influence of voltage ±0.5% of FS max. (±0.5% ±10 ms max. at 1.2-s range)
Influence of
±2% of FS max. (±2% ±10 ms max. at 1.2-s range)
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 voltage
Between power supply terminals:
1 kV for 24-VAC/DC and 48-VAC/DC models, 5 kV for all other models.
Between conductor terminal and operating section: 7.4 kV
Noise immunity Square-wave noise generated by noise simulator
(pulse width: 100 ns/1 μs, 1-ns rise):
±1.5 kV (between power supply terminals)
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. 90 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-H Specifications 5

Applicable standards

cULus: UL 508/CSA C22.2 No. 14
EN 61812-1: Pollution degree 2, Overvoltage category III
CCC: Pollution degree 2, Overvoltage category II, section GB 14048.5
LR: Category ENV1.2
DNV GL (Temperature B, Humidity B, Vibration A, EMC A, Enclosure A)
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


Input None
Output Control output The Timer operates as soon as the Timer is turned ON. The Timer
starts timing when the power is turned OFF and the output is turned
OFF when the time set on the dial elapses.