Is the Q312B a main base or extension base?
It is a main base unit for MELSEC-Q series
1 actual photo shown first. Reference images are model-matched and must be confirmed before purchase.
Mitsubishi
Q312B
CPU base rack, 12 slots, 1 PSU slot, 5 VDC
Mitsubishi
From $208.53In stock
Product Description
The Q312B is a main base/backplane unit for MELSEC-Q (QnU) series PLC systems, providing a 12-slot rack with one dedicated power supply position and integrated CPU base functionality. Designed for 5 VDC backplane operation, it supports modular Q Series I/O and specialty modules in high-reliability industrial automation applications. The chassis accommodates stable signal distribution across the rack and maintains compliance with CE, UL/cUL, and UKCA, with multiple marine approvals for demanding environments. Mechanical dimensions are approximately 98 x 439 x 44.1 mm, enabling compact panel layouts while offering ample expansion capacity. Typical use includes centralizing CPU, power supply, and up to 12 I/O module slots on a single base for scalable control architectures. This unit is suitable for Q Series installations requiring standardized backplane connectivity and a consistent mechanical footprint. Package content is the base unit; modules and power supply are sold separately.
Key Features
- •Main base/backplane for MELSEC Q series
- •12 total module slots
- •1 dedicated power supply slot
- •5 VDC backplane operation
- •Compact 98 x 439 x 44.1 mm footprint
- •CE UL cUL UKCA compliant
- •Marine approvals ABS BV DNV GL LR NK RINA
Buy Options
Condition, indicative price, stock, and lead time. Confirm current availability via RFQ.
ConditionPriceAvailabilityLead time
New
Price: $539
Availability: 4 in stock
Lead time: ~2 day lead
Never Used
Price: $468
Availability: 1 in stock
Lead time: ~9 day lead
Used
Price: $208.53
Availability: 75 in stock
Lead time: ~2 day lead
FNFP
Price: $708
Availability: 1 in stock
Lead time: ~2 day lead
Specifications
- Model number
- Q312B
- Series
- MELSEC-Q (QnU) series
- Main function
- Base rack / backplane unit
- Slots
- 12
- Power supply slots
- 1
- Backplane voltage
- 5 VDC
- Dimensions
- 98 x 439 x 44.1 mm
- Weight
- 0.45 kg
- Compliance
- CE, UL/cUL, UKCA
- Marine approvals
- ABS, BV, DNV GL, LR, NK, RINA
- Part #
- Q312B
- Category
- PLCs/Machine Control
- Subcategory
- PLC Module/Rack
- Weight
- 1.65 lbs
Before we quote this part
Actual photos when available
Nameplate, condition, and visible wear can be shared before quote when stock photos are not enough.
Test notes for used units
Power-on or function test status is stated when available, with clear condition grading.
Trackable global shipping
DHL, FedEx, UPS, or forwarder options can be quoted with packing photos and tracking details.
Clear DOA boundary
For tested units, quote terms can include 7-day DOA support unless otherwise stated.
Independent sourcing disclaimer
We are not an authorized distributor, reseller, or representative of Siemens, Mitsubishi, Omron, or other manufacturers listed on this site. All product names, trademarks, brands, and logos are the property of their respective owners. Products may be used, refurbished, surplus, or sourced from the secondary market unless otherwise stated.
Need Q312B availability?
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FAQ
How many module slots are available?
Twelve total slots with one dedicated for the power supply
What backplane voltage does it use?
5 VDC
What are the physical dimensions?
Approximately 98 x 439 x 44.1 mm
Which certifications does it meet?
CE, UL/cUL, UKCA; marine approvals ABS, BV, DNV GL, LR, NK, RINA