Canon imageRUNNER C3125i

Specifications in detail

Main Unit

Machine type

A3 Colour Laser Multifunctional

Core functions

Print, Copy, Scan, Send and Optional Fax


Canon Dual Custom Processor (Shared)

Control Panel

12.7 cm (5 inch) TFT LCD WVGA Colour Touch panel


Standard: 2.0GB RAM

Interface Connection

Standard: 1000BaseT/100Base-TX/10Base-T, Wireless LAN (IEEE802.11b/g/n)
Optional: NFC
Standard: USB 2.0 (Host) x 2,USB 2.0 (Device) x 1
Optional: Copy Control Interface

Paper Supply Capacity (A4, 80 gsm)

Standard: 1,200 Sheets 
100-sheets Multi-purpose tray x 1, 550-sheets Paper cassette x 2
Maximum: 2,300 Sheets (with Cassette Feeding Unit-AP1)

Paper Output Capacity (A4, 80 gsm)

Standard: 250 Sheets
Maximum: 700 Sheets (with Inner Finisher-K1 and Copy Tray-J2)

Finishing capabilities

Standard model: Collate, Group
Finisher model (Inner Finisher-K1): Collate, Group, Offset, Staple, Eco Staple, Staple On Demand

Supported media types

Multi-purpose Tray:
Thin, Plain, Heavy*, Recycled, Coated*, Colour, Tracing, Bond, Transparency, Label, Pre-punched, Envelope
* SRA3 is unsupported for Coated (257-300gsm) and Heavy (257-300gsm) paper.
Paper Cassette (Upper/Lower Cassette):
Thin, Plain, Heavy, Recycled, Colour, Bond, Transparency, Pre-punched, Envelope*
*Lower Cassette: Envelope Feeder Attachment A is required.

Supported media sizes

Multi-purpose tray: 
Standard size: SRA3, A3, A4, A4R, A5, A5R, A6R, B4, B5, B5R, Envelope [COM10 No.10, Monarch, ISO-C5, DL] 
Custom size: 98.4 x 139.7 mm to 320.0 x 457.2 mm
Paper Cassette (Upper Cassette):
Standard size: A4, A5, A5R, A6R, B5
Custom size: 105.0 x 148.0 mm up to 297.0 x 215.9 mm
Envelope: ISO-C5
Paper Cassette (Lower Cassette):
Standard size: A3, A4, A4R, A5, A5R, A6R, B4, B5, B5R
Custom size: 105.0 x 148.0 mm up to 304.8 x 457.2 mm
Envelope: [COM10 No.10, Monarch, DL]*
*Envelope Feeder Attachment A is required.

Supported media weights

Multi-purpose tray: 52 to 300 gsm*
* SRA3 is unsupported for Coated (257-300gsm) and Heavy (257-300gsm) paper.
Paper Cassette (Upper/Lower Cassette): 52 to 220 gsm
Duplex: 52 to 220 gsm

Warm-up Time

From Power On: 19 Seconds or Less*

*Time from device power-on, until copy ready (not print reservation)

From Sleep Mode: 10 Seconds or Less

Dimensions (W x D x H)

565 x 664 x 880 mm

Installation Space (W x D)

1241 x 1217 mm 
*with Cassette open + 100 mm gap around the main body


Approx. 67.3 kg without toner

Copy Specifications

Copy speed (BW/CL)

Up to 25/25 ppm (A4, A5, A5R, A6R), Up to 15/15 ppm (A3), Up to 20/20 ppm (A4R)

First-Copy-Out Time (A4) (BW/CL)

Approx. 5.9 / 8.2 seconds or less

Copy resolution (dpi)

600 x 600

Multiple Copies

Up to 999 copies

Copy Density

Automatic or Manual (9 Levels)


Variable zoom: 25% - 400% (1% Increments)
Preset reduction/enlargement: 25%, 50%, 70%, 100% (1:1) / 141%, 200%, 400%

Copy Features

Preset R/E Ratios by Area, Two-Sided, Density Adjustment, Original Type Selection, Book to Two Pages, Two-sided Original, Sort, N on 1, Different Size Originals, Sharpness, Erase Frame, Copy ID Card, Copy Passport, Colour Mode

Scan Specifications


Standard: Duplexing Automatic Document Feeder [2-sided to 2-sided (Automatic with DADF)]
Optional: Colour Platen (Platen Cover-Y2)

Document Feeder Paper Capacity (80 gsm)

100 Sheets

Acceptable Originals and weights

Platen: Sheet, Book, and 3-Dimensional objects 

Document Feeder media weight: 
1-sided scanning: 38 to 128 gsm (BW), 64 to 128 gsm (CL)
2-sided scanning: 50 to 128 gsm (BW), 64 to 128 gsm (CL)

Supported media sizes

Platen: max. scanning size: 297.0 x 431.8 mm

Document Feeder media size: 
A3, A4, A4R, A5, A5R, B4, B5, B5R, B6
Custom size: 128.0 x 139.7 mm to 297.0 x 431.8 mm

Scan Speed (ipm: BW/CL, A4)

1-sided Scanning: 
55/55 (300 x 300 dpi, send), 30/30 (600 x 600 dpi, copy), 
2-sided Scanning: 
27.5/27.5 (300 x 300 dpi, send), 15/15 (600 x 600 dpi, copy)

Scan Resolution (dpi)

Scan for Copy: up to 600 x 600
Scan for Send: (Push) up to 600 x 600, (Pull) up to 600 x 600
Scan for Fax: up to 600 x 600

Pull Scan Specifications

ScanGear MF. For both TWAIN and WIA
Supported OS: Windows® 7/8.1/10

Scan Method

Push Scan, Pull Scan, Scan to Network, Scan to memory media (USB Memory Key), Scan to cloud-based services (uniFLOW)

Send Specifications


Standard: E-mail/Internet FAX (SMTP), SMB, FTP
Optional: Super G3 FAX

Address book

LDAP (50)/Local (300)/Speed dial (281)

Send resolution (dpi)

Push: 300 x 300 (Email/SMB/FTP), 192 x 204 (IFAX)
Pull: 50 x 50, 75 x 75, 150 x 150, 200 x 200, 300 x 300, 400 x 400, 600 x 600

Communication protocol


File Format

Standard: TIFF, JPEG*, PDF (Compact, Searchable, Encrypted, Digital Signature)
*Single Page Only

Universal Send Features

Original Type Selection, Two-sided Original, Different-size Originals, Density Adjustment, Sharpness, File Name, Subject/Message, Reply-to, E-mail Priority, TX Report, Original Content Orientation

Fax Specifications

Maximum Number of Connection Lines


Modem Speed

Super G3: 33.6 kbps
G3: 14.4 kbps

Compression Method


Resolution (dpi)

400 x 400 (Ultra Fine), 200 x 400 (Super Fine), 200 x 200 (Fine/Photo), 200 x 100 (Normal)

Sending / Receiving Size

Sending: A3, A4, A4R, A5*2, A5R*2, B4, B5*1, B5R*2
Receiving: A3, A4, A4R, A5R, B4,  B5, B5R
*1 Sent as B4
*2 Sent as A4

FAX memory

Up to 512 pages

Speed dials

Max. 281

Group dials/destinations

Max. 299 dials

Sequential broadcast

Max. 310 addresses

Memory backup


Fax Features

Direct Send, TX Report, Sequential Broadcasting

Security Specifications

Authentication and Access Control

Department ID Authentication (Department ID and PIN Login, Function Level Login), uniFLOW Online Express (PIN Login, Card Login, Card and PIN Login)

Document Security

Print Security (Secure Print, uniFLOW Secure Print*), Scan Security (Encrypted PDF, Device Signature PDF), Send Data Security (Restricted E-mail/File send functions, Confirming FAX number, Allow/Restrict Fax Driver Transmissions, Allow/Restrict Sending from History)
*Requires uniFLOW Online / uniFLOW

Network Security

IPSec, IEEE802.1X authentication, SNMPv3, Firewall Functionality (IP/MAC Address Filtering), Enabling/Disabling Remote UI, G3 FAX separation from LAN, USB Port separation from LAN

Device Security

Standard: Storage Initialize, Job Log Conceal Function, Protecting MFD Software Integrity

Device Management and Auditing

Standard: Administrator Password, Digital Certificate and Key Management, Security Policy Setting

Environmental Specifications

Operating Environment

Temperature: 10 to 30 ºC
Humidity: 20 to 80% RH (Relative Humidity)

Power Source

220-240V 50/60Hz 10A

Power Consumption

Maximum: Approx. 1,5 kW or Less
Average: Approx. 431.0 W (while printing/copying)
Standby:  Approx. 34.3 W*1 
Sleep mode: Approx. 2 W*2 , Approx. 1 W*3
*1 Reference value: measured one unit
*2 Wireless LAN power serve mode OFF
*3 Wireless LAN power serve mode ON, 
*2,*3 Sleep mode is not available in all circumstances due to certain settings. 
Typical Electricity Consumption (TEC) : 0.29 kW
* As per US ENERGY STAR Version 3.0

Noise levels (BW/CL)

Sound Power Level (LWA,m) 
 Active (BW): 6.1/6.4 B*1, Kv 0.3/0.3 B*1
 Active (CL): 6.2/6.4 B*1, Kv 0.3/0.3 B*1 
Sound Pressure (LpAm)
Bystander's position: (2-sided/1-sided)
  Active (BW): 47/50 dB*1 , Active (CL): 47/50 dB*1, Standby: No Noise*2
*1 Reference value: measured only one unit with ISO7779, described with ISO9296:2017
*2 No noise means that the emission sound pressure level of each bystander 
position is lower than the absolute standard with the background noise of ISO 7779.


Blue Angel


Toner Cartridges


Toner yield (Estimated @ 5% coverage)

C-EXV 54 TONER BK: 15,500 pages
C-EXV 54 TONER C/M/Y: 8,500 pages

Software and Printer management

Tracking and reporting

Universal Login Manager (ULM):
Manage your costs easily by using the embedded reporting capability to identify and control costs on a user-based level by device.
uniFLOW Online Express*: Combining with ULM you can gain further control and highlight expenditures per users/department and pinpoint where costs can be scaled down from a central cloud based location.
*Installation, activation and registration required

Remote management tools

iW Management Console:
Server-based software for centralised management of a fleet of devices (includes monitoring or consumables, status monitoring and alerts, distribution of address books, configuration settings, firmware and MEAP applications, meter capture and reporting, driver and resource management)
Compatible with eMaintenance services via embedded RDS (Enables meter capture, automatic consumables management, remote diagnostics and reporting for service providers to offer efficient, fast and proactive maintenance)
Content Delivery System:
Allows the Remote distribution of firmware, iR options and MEAP applications; Remote User Interface (RUI) Web based interface to each device that helps to provide remote device management and control

Customisation Options

Application Library

Scanning software

ScanGear MF Scanner Driver

Optimisation tools

Canon Driver Configuration Tool

Paper Supply options


Paper Capacity: 550 sheets x 2 (80 gsm)
Paper Type: Thin, Plain, Recycled, Color, Heavy, Bond, Transparency, Pre-punched
Paper Size: A3, A4, A4R, A5, A5R, A6R, B4, B5 ,B5R,  
Custom Size: 105.0 x 148 mm to 304.8 x 457.2 mm
Paper Weight: 52 to 220 gsm
Power Supply: From the Main Unit
Dimensions (W x D x H): 565 x 615 x 248 mm
Weight: Approx. 16 kg

Output Options

Inner Finisher-K1

Tray Capacity (with 80gsm paper):
Number of Trays: 2
Lower Tray1: A4, A5, A5R, B5: up to 500 sheets 
                   SRA3, A3, A4R, B4, B5R: up to 250 sheets
                   A6R: up to 30 sheets
Upper Tray2: A4, A5, A5R, B5: up to 100 sheets
                   SRA3, A3, A4R, A6R, B4, B5R: up to 50 sheets 
Paper Weight:
Lower Tray1: 52 to 256 gsm
Upper Tray2: 52 to 300 gsm
Staple Position: Corner, Double
Staple Capacity: 
 A4/B5: 50 sheets (52 to 90 gsm) 
 A3/B4/A4R: 30 sheets (52 to 90 gsm)
Eco Staple:
                      5 sheets (52 to 64 gsm) 
                      4 sheets (65 to 81.4 gsm) 
                      3 sheets (82 to 105 gsm)
Staple On Demand: approx 40 sheets (80 gsm)
Power Supply: From the main unit
Dimensions (W x D x H): 634 mm × 525 mm × 188 mm (when the extension tray and rotary tray are extended)
Weight: Approx. 8 kg


Paper Capacity (with 80 gsm paper)
-Upper tray: 
 SRA3, A3, A4, A4R, A5, A5R, A6R, B4, B5, B5R, Custom size (98.4 x 139.7 mm to 320.0 x 457.2 mm): 100 sheets
-Lower tray: 
 A4, A5, A5R, A6R, B5, B5R: up to 250 sheets
 SRA3, A3, A4R, B4, Custom Size (98.4×139.7 to 320.0×457.2 mm ): up    
 to 100 sheets
Paper Weight: 52 to 300 gsm
Dimensions (W x D x H): 426 x 407 x 76 mm
Weight: 0.7 kg
*Requires 3 Way Unit-D1


Capacity: 100 sheets (80 gsm) *A4, B5, B5R, A5R
Dimensions (W x D x H): 444 × 373 × 176 mm (attached to the main unit,when the extension tray is extended)
Weight: Approx. 0.5 kg
*Requires 3 Way Unit-D1

Hardware Accessories

Card Readers

IC Card Reader Attachment-B2


3 Way Unit-D1

System and Controller options

Print Accessories

PS Printer Kit-BK1

Barcode Printing


System Accessories


Fax Accessories


Other Options

Accessibility Accessories

Platen Cover-Y2

Staple Cartridge