Description
The JS RST-4 AL 400v (code 011-502) is a high flow propeller pump for water features, low lift transfer and drainage of clean and dirty water. It delivers up to 620 litres per minute and a maximum head of 3 metres from a 0.4 kW motor on a 400v three-phase supply, through a 4″ top outlet, and weighs about 26 kg. It has the same hydraulics as the single-phase RS-400 AL on a three-phase motor, so it suits estates, parks and commercial sites that already have a 400v supply at the feature.
Instead of a conventional impeller, the AL series uses a propeller that moves a large volume of water at low head. Read from the JS curve, the RST-4 AL gives roughly 500 l/min at 1 metre of head, and its flow falls to nothing at 3 metres. In the same range, the JS RST-8 AL is the larger three-phase model, up to 1,055 l/min and 5 m, and the JS RS-400 AL is the single-phase 230v version.
The construction is the same across the AL range. A stainless steel outer case, shaft, motor case, lower motor seal and bearing housing and motor top cover surround the motor, and twin mechanical seals (carbon ceramic and silicon carbide) run in a lubricated chamber. Water leaves through the 4″ outlet on top, so the hose or pipe rises straight up from the pump. The pump comes with 10 metres of power cable. No hose tail is supplied, so allow for a 4″ hose or pipe connection when you order.
The pump is supplied without a float switch. JS states that every AL model can be made to work automatically with a control panel and float switches; see our pump controls and float switches, or call us to match the right control to the 400v motor.
Features
- 0.4 kW motor, 400v three-phase
- Up to 620 l/min, maximum head 3 m
- Propeller hydraulics for high volume at low head
- 4″ top outlet
- Stainless steel outer case, shaft, motor case, seal housing and top cover
- Twin mechanical seals (carbon ceramic and silicon carbide) in a lubricated chamber
- Handles solids up to 5 mm
- 10 metres of power cable
Applications
- Water features and displays on estates, parks and commercial sites with 400v
- Pond and lake circulation at low lift
- Clean and dirty water drainage
- Emergency pumping where the lift is small
This is a low head pump. It is not suitable for lifting water out of deep excavations, up to a high discharge point or along a long delivery run, because flow drops steeply as the head approaches the 3 metre maximum. For those jobs, the JS RS and JS RST top outlet pumps lift much higher at lower flow. It handles clean and dirty water with solids up to 5 mm, so it is not a sewage pump and should not be used for raw sewage, rag, sludge, oil or chemicals.
The JS RS/T AL propeller pump range
| Model | Supply | Motor (kW) | Outlet | Max Flow (l/min) | Max Head (m) | Code |
|---|---|---|---|---|---|---|
| RS-400 AL | 230v | 0.4 | 4″ | 620 | 3 | 011-500 |
| RS-750 AL | 230v | 0.75 | 4″ | 1,055 | 5 | 011-501 |
| RST-4 AL | 400v | 0.4 | 4″ | 620 | 3 | 011-502 |
| RST-8 AL | 400v | 0.75 | 4″ | 1,055 | 5 | 011-504 |
Flow and head are the maximums from the JS performance curves above. See the JS RS/T AL high flow propeller pump range page for help choosing between models and answers to common questions.
