Rule Rule-A-Matic 35A Float Switch connections

Rule-A-Matic 35A is a removable-base float switch. The manual rates it for 14 A at 12 V or 7 A at 24 V. This record models the 12 V installation with a 14 A switched-path limit; it does not support changing the circuit to 24 V while retaining 14 A. Select a pump whose operating and starting demands are compatible with the switch. The number 35A identifies the product, not its current capacity.

Connect the protected positive supply to one switch lead and the other lead to pump positive, following the pump and control-panel diagrams. Pump negative returns directly to the negative bus. There is no negative lead on this two-wire float. Use the pump manufacturer’s specified fuse; the switch contact rating is not a recommendation to fit a 14 A fuse. Its factory leads are 16 AWG and approximately 28 inches long; extension cable must satisfy the whole pump circuit’s current and voltage drop.

Install the base at or above the pump base on a suitable mounting pad. Do not drive mounting screws through the hull. Keep the float free of debris and obstructions through its full travel, and respect the illustrated tilt limits: 30 degrees in the long direction and 5 degrees across it. The nominal on level is 2 inches and off level 3/4 inch. Put splices above the highest expected bilge water and seal them against corrosion.

With the circuit isolated, check free float travel and secure wiring. Restore power and lift the float to confirm that the pump starts, then lower it and confirm stopping. Repeat with water so the installation proves drainage and the intended levels, not only switch movement. Inspect periodically for fouling and sticky travel. The drawing’s high-water and low-water states only open or close the positive path; they do not simulate actual water level or certify automatic bilge protection.

Rule installation manual, 950-0520A Rev C, November 2021; printed pp. 7–11 model identity and ratings, pp. 12–15 installation and wiring. The original PDF is retained in the marine source ledger. The drawing represents the identified electrical interfaces; it does not simulate the equipment’s mechanical performance, radio signals or fluid system. Unpublished connector ampacity and startup current remain unspecified.