Omron H3DK-M2 AC-DC24-240V — 8-Mode Multi-Function Timer
SKU: H3DK-M2 AC-DC24-240VUSD 28.00
DIN-rail 8-mode multi-function solid-state timer, 24-240 VAC/VDC universal supply, 6 timing ranges 0.05 s to 300 h, DPDT or SPDT+instantaneous SPDT contact output (switchable), 5 A 250 VAC. Replaces H3CR-H8L / H3YN-4-B.
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Product Overview
The H3DK-M2 AC-DC24-240V is the multi-mode solid-state timer in Omron's H3DK series — the standard DIN-rail timer for industrial control panels that need flexible timing functions without stocking multiple single-function timer SKUs. It supports eight distinct timing modes selected via a rotary switch on the front face: A (ON Delay), B (Flicker OFF Start), B2 (Flicker ON Start), C (Signal ON/OFF Delay), D (Signal OFF Delay), E (Interval), G (Signal ON/OFF Delay), and J (One-shot Output). The universal supply accepts 24 to 240 VAC or 24 to 240 VDC on the same input terminals — a single SKU handles any plant supply voltage without re-specifying.
H3DK-M2 vs H3DK-S2 vs H3DK-M1 selection
The H3DK series splits into 4 SKUs by mode count and supply: H3DK-M1 (8 modes, 100-240 VAC supply), H3DK-M2 (8 modes, 24-240 VAC/DC universal supply — this SKU), H3DK-S1 (4 modes, 100-240 VAC), H3DK-S2 (4 modes, 24-240 VAC/DC). Pick the H3DK-M2 (this SKU) when you need the full 8-mode flexibility and universal supply voltage — the most flexible and most common pick. Pick the H3DK-S2 when you only need 4 modes (ON-delay, Flicker ON Start, Interval, One-shot) and want lower cost. Pick the H3DK-M1 when your plant supply is fixed at 100-240 VAC (no DC operation needed).
The 8 timing modes explained
Each of the 8 timing modes provides a different output pattern useful for different control applications: (A) ON Delay — output turns ON after the set time once the input is energized; used for delayed-start applications (pump pre-lube timer, motor sequential start). (B) Flicker OFF Start — output cycles ON/OFF starting with OFF; used for blink/flash indication. (B2) Flicker ON Start — output cycles ON/OFF starting with ON; used for cyclic operation (repeating alarm, cyclic lubrication). (C) Signal ON/OFF Delay — output turns ON when input starts and OFF after set time after input stops; used for 'follow-on' timing (cooling fan run-on after motor stops).
Universal supply wiring, output contact configuration, and timing ranges
The H3DK-M2's supply input accepts 24 to 240 VAC or 24 to 240 VDC on terminals A1 (+) and A2 (-) — polarity-agnostic for AC, polarity-sensitive for DC. The 85 % to 110 % voltage tolerance covers any plant supply fluctuation without false triggering. The output contact is DPDT (2 Form C) — 8 user-accessible terminals: 4 for the time-limit contact set (common, NO, NC) and 4 for either a second time-limit contact set OR an instantaneous contact set (selectable via the slide switch on the side). When set to DPDT time-limit, you get two independent time-delayed SPDT contacts useful for redundant outputs (e.g.
Key Features
- 8-mode multi-function solid-state timer
- Mode A: ON Delay; Mode B: Flicker OFF Start; Mode B2: Flicker ON Start
- Mode C: Signal ON/OFF Delay; Mode D: Signal OFF Delay
- Mode E: Interval; Mode G: Signal ON/OFF Delay
- Mode J: One-shot Output
- 24-240 VAC/VDC universal supply
- Six timing ranges: 0.05-1.2 s, 0.1-3 s, 1-30 s, 0.1-3 min, 1-30 min, 10-300 h
- DPDT or SPDT+instantaneous SPDT output
- SKU: H3DK-M2 AC-DC24-240V
- Series: H3DK Solid-state Multi-function Timers
- Voltage: 24 TO 240 VAC
Best-Fit Applications
- Pump pre-lube timer — H3DK-M2 in mode A starts the lube pump 30 s before the main pump motor starts.
- Cooling fan run-on timer — H3DK-M2 in mode D keeps the cooling fan running for 5 minutes after the main.
- Cyclic lubrication pump controller — H3DK-M2 in mode B2 cycles the lubrication pump ON for 5 s every 30 min.
- One-shot solenoid pulse generator — H3DK-M2 in mode J generates a 100 ms solenoid pulse from a sustained start-button press.
Buying Checklist
- Pick H3DK-M2 AC-DC24-240V for 8-mode multi-function timer with universal 24-240 VAC/DC supply
- Pick H3DK-S2 AC-DC24-240V for 4-mode economy version — pick if you only need ON-delay, Flicker ON Start, Interval, One-shot
- Pick H3DK-M1 AC100-240V for 8-mode timer with VAC-only supply — pick if your plant is fixed at 100-240 VAC
- Pick H3DS-ML for 17.5 mm 8-mode timer with 24-230 VAC/DC supply — pick if H3DK-M2 is out of stock or you prefer a different form factor
- Pick H3YN-4-B DC24V for 4-mode 8-pin socket-mount timer — pick for legacy panel retrofits where 8-pin socket is already wired
- Pick H3CR-H8L AC100-240 for legacy 11-pin socket 8-mode timer — pick only for direct replacement of existing H3CR-H8L installations
Technical Specifications
| Model | H3DK-M2 AC-DC24-240V |
|---|---|
| Series | H3DK Solid-state Multi-function Timers |
| Type | DIN-rail 8-mode multi-function solid-state timer |
| Operating Modes | 8 modes: A (ON Delay), B (Flicker OFF Start), B2 (Flicker ON Start), C (Signal ON/OFF Delay), D (Signal OFF Delay), E (Interval), G (Signal ON/OFF Delay), J (One-shot Output) |
| Power Supply Voltage | 24 to 240 VAC/DC, 50/60 Hz |
| Allowable Voltage Fluctuation | 85 % to 110 % of rated voltage |
| Power Consumption | 6 VA at 240 VAC / 4 W at 240 VDC |
| Power Reset | Minimum power-OFF time: 0.1 s |
| Reset Voltage | 10 % max of rated voltage |
| Control Output | DPDT (time-limit DPDT, or time-limit SPDT + instantaneous SPDT — slide-switch selectable) |
| Timing Ranges | 0.05-1.2 s, 0.1-3 s, 1-30 s, 0.1-3 min, 1-30 min, 10-300 h (6 ranges) |
| Temperature Influence | ±2 % max of full scale (at -20 to +65 °C) |
| Voltage Influence | ±0.5 % max of full scale (at 85-110 % of rated voltage) |
| Operating Temperature | -20 to +65 °C (no icing) |
| Storage Temperature | -40 to +70 °C |
Resources & Downloads
FAQ for H3DK-M2 AC-DC24-240V
What's the difference between H3DK-M2 and H3DK-S2?
The H3DK-M2 (this SKU) is the full 8-mode multi-function timer supporting A, B, B2, C, D, E, G, J modes; the H3DK-S2 is the 4-mode economy version supporting only A, B2, E, J modes. Both have the same 24-240 VAC/DC universal supply, same 17.5 mm DIN-rail form factor, same 5 A DPDT output. Pick H3DK-M2 when you need flexibility for multiple timing functions in the same panel (mode selection on the front-face rotary switch).
How do I select the timing mode on the H3DK-M2?
Rotate the mode-selector rotary switch on the front face of the H3DK-M2 to one of 8 positions labeled A, B, B2, C, D, E, G, J. The current mode is indicated by the white marker line on the rotary switch.
Can the H3DK-M2 switch DC loads?
Yes — the H3DK-M2's output contacts are rated 5 A at 30 VDC (resistive load) and 2 A at 30 VDC (inductive L/R = 7 ms). For higher DC voltages (> 30 VDC) the contact life drops significantly due to DC arcing, similar to mechanical relay behavior. For DC load switching above 30 VDC consider using the H3DK-M2's contact to drive an interposing solid-state relay (G3PE-225B DC12-24V) which handles the high-voltage DC switching.
What does the slide-switch on the side of the H3DK-M2 do?
The slide-switch on the side of the H3DK-M2 selects between two output configurations: (1) DPDT (time-limit DPDT) — both contact sets are time-delayed, providing two independent SPDT outputs that change at the same time according to the selected timing mode. Use this configuration for redundant outputs (one to PLC, one to hardwired safety circuit) or for two independent loads with the same timing.
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