Omron H3Y Timer Relay Delay Code Chart: H3Y-2-C & H3Y-4-C Cross-Reference
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Omron H3Y delay code chart
The ordering code printed on an Omron H3Y timer case (H3Y3833F and similar) fixes the delay range, series and coil. The chart below maps the codes we see most often to their time ranges, and the stock table lists every H3Y-2-C and H3Y-4-C timer currently listed in our catalog, so you can order the right timer on the first try.
Anatomy of an H3Y part number
- H3Y-2: two timed changeover contacts (2 CO), fits a standard 8-pin octal socket.
- H3Y-4: four timed changeover contacts (4 CO), 11-pin socket.
- The -C suffix marks the case-and-dial variant of the series. Match your original exactly, since dial scales and terminal layout follow the suffix.
- Coil voltage is printed with the series, for example DC24V or AC220V. DC and AC coils are not interchangeable.
- The H3Y38xx ordering code (H3Y3818B, H3Y3833F and so on) locks in the delay range. This is the code to quote when ordering.
H3Y38xx delay code chart
The mappings below come from the H3Y units and listings we have handled. Omron documents the full family on its official H3Y timer page; when in doubt, the code on your unit's case is the final word.
| Ordering code | Series | Coil | Delay range |
|---|---|---|---|
| H3Y3815H | H3Y-2-C | DC 24 V | 1 s |
| H3Y3816F | H3Y-2-C | DC 24 V | 5 s |
| H3Y3817D | H3Y-2-C | DC 24 V | 10 s |
| H3Y3818B | H3Y-2-C | DC 24 V | 30 s |
| H3Y3819M | H3Y-2-C | DC 24 V | 60 s |
| H3Y3842E | H3Y-2-C | DC 24 V | 30 min |
| H3Y3825E | H3Y-4-C | AC 220 V | 1 s |
| H3Y3828M | H3Y-4-C | AC 220 V | 30 s |
| H3Y3831M | H3Y-4-C | DC 24 V | 5 s |
| H3Y3832H | H3Y-4-C | DC 24 V | 10 s |
| H3Y3833F | H3Y-4-C | DC 24 V | 30 s |
| H3Y3834D | H3Y-4-C | DC 24 V | 60 s |
Codes most often requested from our catalog. Stock changes; the table below shows what is listed today.
H3Y-2-C and H3Y-4-C timers in stock now
| Series | Coil | Delay range | Listing |
|---|---|---|---|
| H3Y-2-C | AC 110 V | 1 s | view listing |
| H3Y-2-C | AC 110 V | 30 s | view listing |
| H3Y-2-C | AC 110 V | 3 min | view listing |
| H3Y-2-C | AC 110 V | 30 min | view listing |
| H3Y-2-C | AC 220 V | 60 s | view listing |
| H3Y-2-C | DC 24 V | 3 min | view listing |
| H3Y-2-C | AC 110 V | 5 s, boxed unit | view listing |
| H3Y-4-C | AC 110 V | 1 s | view listing |
| H3Y-4-C | AC 110 V | 5 s | view listing |
| H3Y-4-C | AC 110 V | 60 s | view listing |
| H3Y-4-C | AC 110 V | 3 min | view listing |
| H3Y-4-C | AC 110 V | 30 min | view listing |
| H3Y-4-C | AC 220 V | 30 s | view listing |
| H3Y-4-C | DC 24 V | 1 s | view listing |
| H3Y-4-C | DC 24 V | 3 min | view listing |
| H3Y-4-C | DC 24 V | 30 min | view listing |
Listings verified October 2026. If your coil voltage or delay range is missing, email the full case text of your unit and we will source it.
Reading the dial once the timer is in hand
The code fixes the range; the front dial sets the actual time within that range. An H3Y3818B (30 s range) set to "3" gives roughly 3 seconds, and the same dial position on an H3Y3819M (60 s) gives about 6. After replacing a timer, always time one cycle against the process requirement rather than trusting the dial position from the old unit.
H3Y-2 vs H3Y-4 vs H3YN: quick selection
- Two timed contacts are enough (star-delta, simple delay circuits): H3Y-2 or H3Y-2-C on an 8-pin socket.
- Four timed contacts (staggering two loads from one timer): H3Y-4 or H3Y-4-C on an 11-pin socket.
- DC control cabinet at 200-230 VDC: the H3YN-2 variant exists for that supply.
- Replacing an existing unit: copy the full case text (series, suffix, coil, H3Y38xx code). The suffix and the code must both match.
Common failure modes worth knowing
- The timer never picks up. Check for a coil voltage mismatch first; a DC24V code on an AC circuit can read fine with a meter yet fail to switch cleanly.
- The delay drifts over years. Internal capacitor aging is the usual cause. Replace the unit rather than recalibrating.
- Burn marks on the socket. Replace the socket together with the timer; a charred octal socket will damage the next unit too.
Frequently asked questions
What does the H3Y38xx code on my Omron timer mean?
It is the ordering code that fixes the delay range and, together with the series and coil marking, the full specification. For example H3Y3818B is an H3Y-2-C with a DC 24 V coil and a 30 s range. Use the chart above to map the code on your unit.
Can I replace an H3Y-2 with an H3Y-4?
Not as a drop-in. The H3Y-2 uses an 8-pin octal socket and the H3Y-4 an 11-pin socket, so the base and wiring differ. Match the series you are replacing.
Is the delay adjustable on an H3Y?
Yes. The ordering code fixes the maximum range; the front dial adjusts the actual delay within that range. Time one full cycle after installation to verify.
Which coil voltages do you stock?
The current H3Y-2-C and H3Y-4-C listings cover AC 110 V, AC 220 V and DC 24 V coils with delays from 1 s to 30 min (stock table above). Other coil voltages in the H3Y family, including the 200-230 VDC H3YN-2, are sourced on request: email the full case text of your unit.
Ordering an H3Y timer
Find your series, coil and delay in the stock table above and order from the listing, or email your timer list and we will confirm each code before you pay. Every H3Y ships with a 1-year warranty and worldwide delivery. Need other control parts alongside? Our MRO supplies catalog covers the full range.