CH 4-50 FL (50 Hz) - Centrifugal multistage automatic flow switch pump


The CH 4 Automatic Flow Switch range of centrifugal multistage pumps are built to provide a high quality and reliable solution for applications that require high flow rates and where a gravity flow of approx. 1 l/min already exists.


  • Ideal for the pressurisation of water to outlets in a positive head application, where an instant boosted supply is required from a simple to install package
  • The range is suitable for commercial or domestic use, pumping hot or cold water

Technical Specification

Product code 46605
Guarantee 2 years
WRAS approval 1601035
Pump type Centrifugal
Mechanical seal EPDM / Carbon / Ceramic
Dry run protection  
Pump body Brass / stainless steel
Impeller Stainless steel
Maximum head (closed valve) 50 metres
Performance @ 50 l/min 45 metres
Performance @ 100 l/min 31 metres
Maximum flow 145 l/min
Minimum static inlet pressure 0.05 bar (0.5 metres)
Maximum static inlet pressure 1.0 bar (10 metres)
Maximum working pressure* 900 kPa (9 bar)
Maximum ambient air temperature 40 °C
Min / Max water temperature** Min 4 °C / Max 65 °C
Flow switch sensitivity (approx) 1 l/min
Pump connections G 1¼ female (inlet), G 1 female (Outlet)
Type Induction, auto-reset thermal trip
Duty rating Continuous (S1)
Power supply/phase/frequency 230 V a.c./ 1 / 50 Hz
Current (full load) 7.3 Amps
Power consumption 1640 Watts
Fuse rating 13 Amps
Power cable (pre-wired) 0.75 metres
Enclosure protection IPX5
Length 431 mm
Width 187 mm
Height (excluding hoses) 247 mm
Weight (including fittings) 15.5 Kg

* The maximum pressure that can be applied to the pump under any installation conditions.

** A stored water temperature of 60 °C is considered sufficient to meet all normal requirements and will minimise deposition of scale in hard water areas.

Pump Variants
Part no Description
46578 CH 4-30 FL, 230/1/50 EPDM/CAR/CER
46596 CH 4-40 FL, 230/1/50 EPDM/CAR/CER
46605 CH 4-50 FL, 230/1/50 EPDM/CAR/CER
46606 CH 4-60 FL, 230/1/50 EPDM/CAR/CER