The Citizen CL-S621 Series is a desktop label printer family with a built-in power supply for warehouses, production, retail and logistics. It runs from the direct thermal CL-S521 (203 dpi) and CL-S531II (300 dpi) to the thermal transfer CL-S621 (203 dpi) and CL-S631 (300 dpi) with 360 m ribbons, plus the 6-inch CL-S6621 with 168 mm print width. Every model has USB and RS-232, with an optional LAN or Wi-Fi card.
Which version?
| Model |
Print method |
Resolution |
Print width |
Speed |
| CL-S521 |
Direct thermal |
203 dpi |
104 mm |
up to 150 mm/s |
| CL-S531II |
Direct thermal |
300 dpi |
105 mm |
up to 100 mm/s |
| CL-S621 |
Thermal transfer + direct thermal |
203 dpi |
104 mm |
up to 150 mm/s |
| CL-S631 |
Thermal transfer + direct thermal |
300 dpi |
105 mm |
up to 100 mm/s |
| CL-S6621 |
Thermal transfer + direct thermal |
203 dpi |
168 mm |
up to 150 mm/s |
| CL-S6621 XL |
Thermal transfer + direct thermal |
203 dpi |
168 mm |
up to 150 mm/s |
The CL-S6621 holds 5-inch label rolls inside, with an optional 8-inch roll holder; the CL-S6621 XL comes with the 8-inch external roll holder. One CL-S631 version carries a CL-S621II front badge — it prints at 300 dpi like the standard CL-S631.
CL-S621 or CL-E300?
Choose the CL-S621 Series for a built-in power supply, 360 m ribbons on the CL-S621 and CL-S631, an optional LAN or Wi-Fi card and a 6-inch model. Choose the CL-E300 Series for Ethernet built into the standard versions, a Bluetooth option, cutter versions and a white housing.
All CL-S621 Series printers below are CE certified and covered by manufacturer warranty. The thermal transfer models need a ribbon matched to the label material — see our ribbons and labels.
Printing continuously? See the Citizen CL-S700III → Direct thermal only? See the Citizen CL-S400DT → Labelling chemicals? See the GHS / CLP printers →
