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Black thermal receipt printer with drop-in paper loading, auto-cutter, and USB serial ports

Citizen

Citizen CT-S4000RSU-BK Two-Color Receipt Printer 150 mm/s 203 dpi USB Serial 112 mm

SKU CH-7YF9-6EQ7J MPN CT-S4000RSU-BK

Prints two-colour thermal receipts at 150 mm/s with 203 dpi resolution and supports three paper widths up to 112 mm

  • Memory size384K bytes
  • Interface typeSerial / USB
  • Printing methodThermal
  • Printing speed150 mm / sec
  • Max monochrome resolution203 dpi
  • Built-in fontsCharacter Size Font A: 1.25 × 3.0 mm (12 × 24 dots), Font B:
  • Two-color thermal printing highlights receipts and prescriptions
  • 150 mm/s print speed processes high-volume queues quickly
  • Drop-in 102 mm roll capacity reduces paper changes
  • Three paper widths (112, 82.5, 80 mm) fit diverse formats
  • USB and Serial interfaces with cable included connect instantly

Two-Color Thermal Receipt Printer

The Citizen CT-S4000RSU-BK is a two-colour thermal receipt printer designed for point-of-sale environments that need fast output and flexible paper widths. It prints at 150 mm/s with a resolution of 203 dpi and supports media widths of 112 mm, 82.5 mm and 80 mm. The unit includes an auto-cutter, internal power supply and dual USB and serial interfaces. A serial cable is supplied in the box.

Suited for High-Volume Counter Use

This model suits retailers, hospitality venues and healthcare sites that print high volumes of receipts, reports or prescription slips and benefit from two-colour highlighting and a large 102 mm roll capacity to reduce paper changes. It is not for operators who require wireless or network connectivity, mobile Bluetooth pairing or a compact mobile form factor for portable use.

Dual USB and Serial Interface

The single specification that decides fit is the dual USB and serial interface combined with three selectable paper widths up to 112 mm. Buyers needing Ethernet, Wi-Fi or a single fixed paper width should evaluate other models.

How it compares

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

Price $345.99
Pricier than about 71% of the 201 comparable items (median $254.99).

Specifications

Product
Brand nameCITIZEN
Model nameCT-S4000
Product colorBlack
Performance
Printing speed150 mm / sec
Max monochrome resolution203 dpi
Memory
Memory size384K bytes
Ports & slots
Interface typeSerial / USB
Power
Power supplyDC 24 V ±7%
Size & build
Product dimensions5.79 in × 6.97 in × 8.39 in
Product weight4.63 lb (2.1 kg)
Shipping weight0.91 kg
Package size244 × 178 × 147 mm
Compatibility
Accepted media sizesPrinting Width: 112 / 82.5 / 80 mm
In the box
Cable includedSerial Cable
More details
Printing methodThermal
Supported barcodesUPC-A/E, JAN/EAN-8, JAN/EAN-13, ITF, Code 39, Code 93, Code 128, CODABAR, PDF417 (Label type only)
Cutter typeAuto-Cutter
Media formatThermal Paper

Questions about this item

How often will the auto-cutter need replacement on the CT-S4000RSU-BK?

The built-in auto-cutter handles continuous cutting of thermal paper rolls up to 102 mm diameter. No user-serviceable cutter module is specified, so replacement would require professional service if wear occurs after extended high-volume use.

What limits continuous printing speed on the CT-S4000RSU-BK during a full shift?

The printer sustains 150 mm/s (354.3 inch/min) with 384 KB buffer memory and DMA support. Thermal head cooling and paper roll capacity (102 mm) are the practical limits before a pause for roll change or cool-down.

How much heat and noise does the CT-S4000RSU-BK produce when running all day?

The internal 24 V DC power supply and thermal print engine generate moderate heat during sustained 150 mm/s output. An internal buzzer signals alerts; no fan is fitted, so acoustic output is limited to paper feed and auto-cutter actuation sounds.

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