Johnson Pump Ultima Switch Auto Control w/Mirus

The Ultima Switch is a cutting-edge fluid level detection solution designed specifically for marine and boating applications. Utilizing advanced Mirus field effect detector cells, it reliably monitors water and fluid levels without direct contact, ensuring longevity and minimal maintenance even in harsh marine environments.

Advanced Detection Technology

Equipped with Mirus field effect detector cells, the Ultima Switch generates micro-electrical fields to sense fluid level disruptions. This solid-state technology ensures that the detector cells remain completely sealed, preventing any contact with water or other fluids. As a result, the switch is immune to corrosion, oil interference, and contamination from foreign debris, making it ideal for the demanding conditions of boating and marine use.

Reliable Performance

The Ultima Switch is designed to activate when the fluid level reaches 50 mm (2") and deactivate at 20 mm (3/4"). A built-in 3-second delay helps prevent false activations, providing consistent and dependable operation. This switch is compatible with all Johnson Pump submersible pumps, supporting up to 20 amps at both 12 and 24 volts, ensuring versatility for various marine pump setups.

Key Features

• No moving parts for enhanced durability
• Fully sealed solid-state electronics and field detectors
• Mercury-free design for environmental safety
• Exposed sensors are eliminated to prevent corrosion
• Unique 3-way switch functionality allows disabling of piezo alarms while maintaining warning LED indicators
• Environmentally sensitive operation tailored for marine settings

Technical Specifications

Attribute	Details
Voltage	12V
Type	Switch
Dimensions	3" H x 6" W x 9" L
Weight	0.3 lbs
UPC	729321363037

Additional Resources

Download Owner's Manual (PDF)

Product Demonstration

Orders of physical products placed by 3 PM EST M-F typically ships the same day, if all requested items are in stock. Weekend orders will typically ship on Monday.

Shipping takes 2-7 days.

We currently ship to the Contiguous 48 States.

Life of Sailing merch is custom made for the customer after an order is placed. Total turnaround is typically 7-14 days from order to doorstep.