Omron E5 Temperature Controller Family Guide: E5C2, E5CZ, E5CC, E5CN, E5EC Compared

Omron's E5 series covers everything from a dial-set thermostat to a multi-loop programmable controller — and because several generations share the same 48×48 panel cutout, buyers often can't tell which unit they're holding or which one to order as a replacement. This guide breaks the family down by position and panel size, lists the part numbers we actually stock, and decodes the output-type letters in the model codes.

The family at a glance

Panel sizes above are the typical family values — verify the panel cutout against the manual before ordering a replacement, especially when swapping one series for another in the same cabinet.

Decoding the model codes

Take E5CN-R2MT-500, a unit we stock. Breaking it down:

• E5CN — the series (standard 48-square, multi-input).
• R — output type: R = relay output (voltage outputs are marked with a different letter). Relay outputs switch external contactors and SSRs directly; voltage outputs drive an external SSR and give tighter control.
• The remaining letter groups encode input type, option units and depth generation — copy the full code when ordering a like-for-like replacement.
• -500 — suffix variant of the unit as stocked; match it too.

The same logic applies across the family: E5CC-RX3DSM-000, E5CC-RX2ASM-802, E5CZ-C2ML, E5C2-R20K, E5CS-VQ1T-F, E5CSL-RP and E5CX-QTC are all current or recent listings in our catalog.

Which one do you actually need?

1. Replacing a failed unit: order the exact model code from the front label — the family spans generations that look alike but differ in depth, terminals and software.
2. Simple on/off heating (band heaters, small ovens): E5C2 dial thermostat or E5CZ — cheapest, no configuration needed.
3. PID control with auto-tuning: E5CC or E5CN. The E5CN's multi-input accepts thermocouple or RTD without hardware changes.
4. New panel build: choose the current-generation E5EC/E5AC/E5EN — parts availability for the next decade is better than for discontinued series.
5. Driving an SSR: pick a voltage-output model rather than relay output — relays wear out quickly at short cycle times.

Power supply note

The stocked E5CN-R2MT-500 and E5CZ-C2ML listings run on 100–240 V AC, which covers both 110 V and 230 V panels. DC-supply variants exist in the family — check the supply marking on the side of your existing unit before ordering, since connecting a 24 V DC model to mains destroys it instantly.

Frequently asked questions

What is the difference between E5CC and E5CN?

Both are standard 48×48 mm digital controllers with PID and auto-tuning. The E5CN is the multi-input series — one hardware accepts thermocouple or RTD — and carries more option variants; the E5CC is the cost-focused basic series. For a like-for-like replacement, match the full model code.

What does the R in E5CN-R2MT mean?

R denotes a relay output. Relay outputs switch contactors and small loads directly; for fast-cycling SSR control choose a voltage-output model instead.

Will an E5CC fit the hole where my old E5CZ was?

Usually yes — both are 48×48 mm family units — but always verify the panel cutout and terminal layout against the manuals before ordering, as depth and terminal positions differ between generations.

Do you stock E5 accessories like sockets and adapters?

Stock changes constantly — search Omron E5 in the catalog, or email moritta@koeed.com with the model codes on your unit and panel.

How to order

Click a stocked series in the table above, browse the temperature controller catalog, or email moritta@koeed.com with the full model code from your unit's label — we confirm the exact match before you pay. Every E5 controller ships with a 1-year warranty and worldwide delivery.