Which control unit suits your installation?
A control unit does what a separate float cannot: alternate two pumps, make the level adjustable, report a fault and protect the motor. As soon as a pump does work you do not check daily, that is the difference between a pump that reports trouble and a pump that quietly gives up.
What to look for
- Number of pumps. A single-pump control switches one pump. A twin-pump control runs two pumps in turn, so they wear evenly, and lets one take over if the other fails.
- Voltage and current. 230 V or 400 V, and within which current range. Take the rated current from the rating plate; you set the protection to that, not to the fuse rating of the circuit.
- Level detection. Floats, electrodes or a level sensor. Floats are robust and need space; electrodes and sensors switch more precisely but need maintenance.
- Motor protection. An adjustable thermal overload is part of the job. On a three-phase pump, phase-sequence monitoring is useful: running the wrong way round delivers hardly any flow and damages the pump.
- Signalling and siting. Check whether a volt-free contact or an audible alarm is included. The control unit itself always belongs in a dry, ventilated space — never in the sump.
If you only need on and off, a separate float switch will do. If it is purely motor protection for a 400 V pump, look at the control panels and motor protection. In doubt? Call 085 - 210 08 97.
