Control Float Switches are most commonnly used in multiswitch simplex and duplex sewage lift stations.  They carry signal voltage to activate highwater alrms, turn on auxiliary pumps, sense low and high water conditions.  Different from pump switches, Control Switches do not carry full pump voltage, but lower, on-off "signal" voltage to the panel.  SJE Rhombus makes cotrol switches for various applications.  Listed below are part number compontents that specify and help identify the configuration of proper switch needed. 

SJE Rhombus Control Switch Overview

All switches are identified by a 7-digit manufacturer part number and a model number that describes the build. 
Here's the key to model number build labeling:
PC = Pipe Clamp
WE = Weighted Externally 
NO = Normally Open 
NC = Normally Closed
NOTE: Descriptions are grouped by cable length measured in feet (10, 15, 20, 30)
FOR NO MOUNTING there is a price deduction from the mounting clamp list price
PACKAGING: Bagged - Standard Boxed - Each prices are given on this website.  For bulk pricing - orders in in master carton quantities, please contact customer service for quantity details and pricing
ADDITIONAL CABLE: Longer cable lengths are available. Please contact us for details

Trouble Shooting float switch operation....