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White industrial label printer with front panel and ports visible

Citizen

Citizen Cl-S521 203 dpi direct thermal label printer USB Ethernet Serial

SKU CH-1ZGB-MDJ57 MPN Cl-S521

Industrial direct thermal label printer at 203 dpi with USB, Ethernet and serial interfaces

  • Interface typeEthernet / Serial / USB
  • Printing methodDirect Thermal
  • Printer categoryIndustrial
  • Max monochrome resolution203 × 203 dpi
  • Sharp 203 dpi output for clear barcodes
  • Direct thermal printing needs no ribbons or ink
  • USB, Ethernet and Serial ports for flexible integration
  • Industrial build handles high-volume label runs
  • Ready to operate on 100-120 VAC 60 Hz power

Industrial direct thermal printing

The Citizen CL-S521 is an industrial barcode and label printer that uses direct thermal technology at 203 dpi. It connects via Ethernet, USB, or Serial interfaces for integration into existing systems. The unit ships with a power cord and operates on 100-120 VAC at 60Hz. All components are tested and confirmed in working condition.

Suited for ribbon-free label workflows

This printer fits operations that need durable industrial hardware for direct thermal media without ribbons. Buyers who require thermal transfer capability or higher print resolutions should look at alternative models. It is also not intended for colour printing or mobile battery-powered use. The fixed 203 dpi resolution limits fine-detail graphics.

203 dpi direct thermal resolution

The single specification that determines fit is the 203 dpi direct thermal print engine. It dictates label clarity, media compatibility, and the absence of ribbon supplies. Verify that your label formats and durability needs match this resolution and print method before purchasing.

How it compares

Measured against everything we stock in Thermal Label & Receipt Printers, at today’s prices. Recalculated every night.

Price $129.99
Pricier than about 58% of the 858 comparable items (median $84.99).

Specifications

Product
Printer categoryIndustrial
Performance
Max monochrome resolution203 × 203 dpi
Ports & slots
Interface typeEthernet / Serial / USB
More details
Printing methodDirect Thermal

Questions about this item

What power supply does the CL-S521 require?

The printer runs on 100-120 VAC at 60 Hz and includes a power cord.

Which interfaces must be connected for the CL-S521 to communicate?

Connect Ethernet (RJ-45), USB or Serial; install the driver and select the matching port in the printer settings.

When should the printhead on the CL-S521 be replaced?

Replace the printhead when labels show missing lines or dead pixels; the platen roller should also be checked for cracks or pits.

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