CDL(F) Pump Protector: Dry Running, Phase Loss and Overload
October 26, 2026 2 min read Haquan
A CDL(F) can be supplied with a protector that watches the pump and motor and stops them on three faults.
| Fault | What happens without protection | What the protector does |
|---|---|---|
| Dry running | The seal and the bearings lose their water film and are damaged quickly | Stops the pump |
| Phase loss | The motor hums, draws high current and overheats | Stops the motor |
| Overload | The motor runs hot and its insulation ages fast | Stops the motor |
When it is worth having
- Pumps that run unattended, such as booster sets and water treatment units
- Supplies that are weak or unreliable
- Pumps drawing from tanks that can run empty
Ask for it with the pump; it is configured at the factory.
Products in This Series
Pipeline Centrifugal Pumps & CDL Multistage PumpsLarge CDL(F) Pumps: 65 to 150 m³/h at Up to 161 m
The CDL(F) 65, 85, 120 and 150 move 65 to 150 m³/h at heads up to 161 m with motors up to 75 kW. Sizes, ports and the -1/-2 builds.
65 to 150 m³/h
Flow Rate (m³/h)
12 to 161 m
Head (m)
4 to 75 kW
Power (kW)
Pipeline Centrifugal Pumps & CDL Multistage PumpsSmall Flow, High Head: CDL(F) 2 and CDL(F) 4 Up to About 200 m
The CDL(F) 2 and 4 deliver 2 and 4 m³/h at heads up to 198 m and 178 m. Where these small multistage pumps fit and how to pick the stage count.
2 and 4 m³/h
Flow Rate (m³/h)
15 to 198 m
Head (m)
0.55 to 4 kW
Power (kW)
Pipeline Centrifugal Pumps & CDL Multistage PumpsBoiler Feed and Condensate Return with the Hot Water CDL(F)
The hot water CDL(F) handles liquids from -15 to 140 °C for boiler feed and condensate. Pressure, NPSH and what to check on hot duties.
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