Omron H3Y Timer Relay Delay Code Chart: H3Y-2-C & H3Y-4-C Cross-Reference

The Omron H3Y is the workhorse solid-state timer relay of the automation cabinet: an octal-base plug-in unit that closes or opens its contacts after a set delay. When one fails, the fastest path to a replacement is reading the ordering code on the case — but that code (for example H3Y3833F) says nothing obvious about delay time or voltage unless you have the chart. This guide maps the H3Y38xx codes we stock to their time ranges and coil voltages, so you can order the right timer on the first try.

Anatomy of an H3Y part number

• H3Y-2 — 2 timed changeover contacts (2 CO), fits a standard 8-pin octal socket.
• H3Y-4 — 4 timed changeover contacts (4 CO), 11-pin socket.
• -C — suffix variant within the series; match your original exactly, as dial scales and terminal layout follow the suffix.
• Coil voltage — printed after the series, e.g. DC24V, AC220V. DC and AC coils are not interchangeable.
• Delay code — the H3Y38xx number (e.g. H3Y3818B) that locks in the time range. This is the code to quote when ordering.

H3Y38xx delay code chart

Every row below is a listing currently in our catalog — the code, series, coil and delay exactly as stocked. Codes not listed here exist in the H3Y family; if yours is missing, email the full case text and we will source it.

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
H3Y3836M	H3Y-2-C	DC 24 V	3 min
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
H3Y3845M	H3Y-4-C	AC 220 V	3 min
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

Other coil voltages exist in the family — for example we stock multi-voltage listings covering 12 VDC, 24 VDC, 110 VAC and 220 VAC coils on the H3Y-4, plus the H3YN-2 200–230 VDC variant. Search the catalog for any code: H3Y-2-C · H3Y-4 · H3Y38.

Reading the dial once the timer is in hand

The code fixes the range; the front dial sets the actual time within that range. A H3Y3818B (30 s range) set to "3" gives roughly 3 seconds; the same dial position on a 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

1. Need two timed contacts (star-delta, simple delay circuits) → H3Y-2/H3Y-2-C on an 8-pin socket.
2. Need four timed contacts (staggering two loads from one timer) → H3Y-4/H3Y-4-C on an 11-pin socket.
3. DC control cabinet at 200–230 VDC → the H3YN-2 variant exists specifically for that supply.
4. Replacing an existing unit → always copy the full case text (series, suffix, coil, H3Y38xx code). The suffix and code must both match.

Common failure modes worth knowing

• Timer never picks up — coil voltage mismatch (a DC24V code on an AC circuit reads fine with a meter but will not switch cleanly).
• Delay drifts over years — internal electrolytic aging; replace, don't recalibrate.
• Socket burn marks — replace the socket together with the timer; a charred octal socket eats 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 codes stocked at koeedmro.

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.

Do you stock coils other than DC 24 V and AC 220 V?

Yes — current listings include 12 VDC, 24 VDC, 110 VAC, 220 VAC and 200–230 VDC (H3YN-2) versions. Search H3Y in the catalog or email moritta@koeed.com with the full case text of your unit.

How to order

Find your code in the chart above and click through to the listing, or search the catalog. Every H3Y ships with a 1-year warranty and worldwide delivery; email moritta@koeed.com with your timer list and we confirm each code before you pay.