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Mitsubishi Electric Q38DB — PLCs (Programmable Logic Controllers)

Mitsubishi Q38DB MELSEC-Q 8-Slot Base Unit, 0.23 A

MPNQ38DB

Mitsubishi MELSEC-Q series, Q38DB 8-slot base unit, 328x98x44.1 mm, 0.23 A 5V DC backplane draw, M4 screw or DIN rail mount.

$206.88 – $280.00Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

Q38DB — Specifications
ParameterValue
Mass0.41 Kg
Depth44.1 mm
Width328 mm
Applicable unitMELSEC-Q series unit
Mounting hole sizeM4 screw hole or φ 4.5 hole (for M4 screw)
General specificationRefer to general specifications of CPU module.
Applicable power supply unitMELSEC-Q series power supply unit
External dimensions height98 mm
Number of input (output units)8
DC 5 v internal current consumption0.23 A
DIN rail mounting adapter type nameQ6 DIN 1 (sold separately)

Product details

The Mitsubishi Q38DB is the 8-slot base unit for a MELSEC-Q multi-CPU rack. It provides the backplane that carries your power supply, up to eight I/O or function modules, and the CPU. On the van, it's the frame you build the rest of the control system into. Draws 0.23 A from the backplane supply.

The unit measures 328 mm wide, 98 mm high, and 44.1 mm deep — slim enough to slip into a shallow cabinet. Mounting is via M4 screw holes or a DIN rail adapter (sold separately, part Q6 DIN 1). If you're swapping an older base, check the existing cutout against these dimensions.

Frequently asked questions

What is Q38DB's depth?

44.1 mm deep — shallow enough for most standard cabinets.

Will Q38DB drop into a panel that was specified around FX3S-20MR/ES without rewiring?

No. The FX3S-20MR/ES is a smaller, integrated PLC (75x90x75 mm) and is not a form-factor match for the 328x98x44.1 mm Q38DB base unit. Rewiring and panel rework would be required.

MPN
Q38DB