ST agitator-pumps series is designed for medium and big refrigerators where high reliability and long life are required. These pumps are very popular in both international and domestic markets and are appreciated for their performances and low energy consumption.
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Technical specification
Type | AGITATOR-PUMP with immersed vertical axis. |
Windings | Single-phase motor with Class F. |
Motor body | Casing in extruded aluminium. |
Protection | IP 54 degree of protection from liquid seepage. |
Safety | Built-in thermal motor protection system. |
Ball bearings | Ø 8mm NSK, SKF or equivalent, in semi-rigid and noise-insulated silicone casing. |
Motor shaft | AISI 303 INOX steel Ø 8mm. |
Fastening parts | INOX steel or anti-oxidant materials. |
Motor parts | Thermoplatic motor parts resistant to high temperature. |
Cooling system | Air cooled pump with a suction speed of 2,2 m/second. |
Water connection | Compatible with John Guest fitting. |
Operation | Power supply 220 & 230 Volts – 24 hours a day non stop. |
Regulations | Complying with EN60335-2-41 and WEEE/RoHs directives. |
Note | PATENDED component installed inside. Read manual for correct set up and use. |

TYPE | Volt | Hz | Amp | Watt | Rpm | A | B | C | Propeller Ø (mm) | Weight |
STR-6 | 230 | 50 | 0,18 | 46 | 2800 | 90 | 185 | 78 | 50 2 Blades 15° | 1,48 |
STR-7 | 230 | 50 | 0,19 | 50 | 2800 | 90 | 220 | 90 | 50 2 Blades 15° | 1,55 |
STA-8 | 230 | 50 | 0,25 | 54 | 2800 | 105 | 220 | 90 | 50 2 Blades 15° | 1,85 |
STB-12 | 230 | 50 | 0,36 | 80 | 2800 | 105 | 220 | 90 | 50 2 Blades 15° | 2,48 |
STC-18 | 230 | 50 | 0,46 | 99 | 2800 | 120 | 240 | 90 | 50 2 Blades 15° | 2,57 |
STD-23 | 230 | 50 | 0,51 | 112 | 2800 | 120 | 240 | 90 | 50 2 Blades 15° | 2,66 |
Performance and electrical data has been tested at 0°C with clean water only.