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Capacitor / Overload Box for Grundfos Borehole Pumps

Capacitor / Overload Box for Grundfos Borehole Pumps

Pump control box for Grundfos single-phase 4” PSC motors.

0.37, 0.55 & 0.75kW units contain Klixon relay, starting relay and capacitor in a replaceable cartridge, which is plugged into an aluminium IP54 Enclosure.

1.1, 1.5 & 2.2kW units contain two Klixon relays, starting relay, starting capacitor in an aluminium IP42 Enclosure.


The control boxes have recently been renamed from SA-SPM7 & SA SPM8 to SA-CSIR & SA-CSCR.  

Please note: A Grundfos control box must be used with SP single phase submersible motors, otherwise the pumps 2 year guarantee will be invalid. 

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Delivery Costs


Please note: Popular models held in stock. Some models are subject to a lead time of 5-7 working days.

Please contact us on 01777 871100 if you need this controller urgently. 

Delivery Map


Zone 1 England, Wales & Southern Scotland Under £100 Over £100
Standard 2/3 working days


Express Next working day


Premium Next working day (before 13.00)


Zone 2 Scottish Highlands & Islands, Northern Ireland, Isle of Man, Scilly & Channel Isles Under £100 Over £100
Standard 2/3 working days


Zone 3 Republic of Ireland Under £100 Over £100
Standard 3/5 working days




Exporting Internationally

We offer a first class worldwide export service. Please contact us here for a price.
Model Power SKU Price ex-VAT Qty
SA-CSIR Motor Control Box 0.37 kW 3925-022 £97.60
SA-CSIR Motor Control Box 0.55 kW 3925-023 £112.80
SA-CSIR Motor Control Box 0.75 kW 3925-024 £129.60
SA-CSCR Motor Control Box 1.1 kW 3925-025 £172.80
SA-CSCR Motor Control Box 1.5 kW 3925-026 £216.80
SA-CSCR Motor Control Box 2.2 kW 3925-027 £248.80
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Whisper Pumps Ltd, Leen Court, Boughton, Newark, Nottinghamshire, NG22 9ZD