The Johnson 36303 Ultima Automatic Bilge Pump Switch uses the patented Mirus field effect detector cells, producing micro-electrical fields that detect disruptions caused by water and fluids. Detector cells are totally sealed and are never in contact with the water, will not corrode and are not affected by oil or foreign debris. No moving parts, totally sealed solid state electronics and field detectors, no mercury and no exposed sensors eliminate corrosion possibilities and makes the Ultima switch environmentally sensitive.

The Johnson Ultima activates at a 50 mm (2'') fluid level and deactivates at a 20 mm (3/4'') fluid level. A 3 second delay prevents false starts. The 36303 Ultima switch is rated to handle pumps up to 20 amps at 12 or 24 volts.

• Totally sealed electronics
  
• No moving parts
  
• Not effected by oils or debris
  
• Completely corrosion proof
  
• ''Mirus'' field effect technology
  
• Activates at 2'' fluid level
  
• De-activates at 3/4'' fluid level
  
• No mercury
  
• No false starts
  
• 20 Amp maximum
  
• 12/24 volt
  
• Ignition Protected
  
• Meets and exceeds NMMA, ABYC, USCG, ISO 8846 and EMC 55014 requirements