Power Selector Switch – Maintained ON-OFF-ON, Waterproof DPDT 12V

• Durvela Solar Aeration Fan Kit

• 12 VDC solar-panel input

• 12 VDC center-positive backup-power adapter input

• Durvela WAGO 221 and RUEF110 adapter fuse assembly

• Durvela capillary thermostat

• Durvela 12 VDC, 6 W aeration fan

• Enclosures prepared for a 12 mm panel-mount switch

• Intended for positive-source selection with a shared common-negative return

• Not compatible with momentary (ON)-OFF-(ON) switches

• Maintained ON-OFF-ON operation

• Three clearly defined positions: SOLAR, OFF and ADAPTER

• Remains in the selected position without being held

• Center OFF position for storage, servicing and shutdown

• SPDT three-terminal configuration

• Electrically separates the solar and adapter positive inputs

• Heavy-duty 30 A at 12 VDC rating

• Waterproof protective boot for exterior panel installation

• Screw terminals simplify field installation and servicing

• Compact 12 mm panel-mount design

Product type: Waterproof source-selector toggle switch

Switch function: Maintained ON-OFF-ON

Switch action: Maintained / non-momentary

Circuit configuration: SPDT

Number of positions: 3

Position labels: SOLAR / OFF / ADAPTER

Number of terminals: 3

Terminal type: Screw terminals

Rated current: 30 A at 12 VDC

AC rating: 15 A at 250 VAC

System application: 12 VDC low-voltage wiring

Mounting type: Panel mount

Required mounting hole: Approximately 12 mm / 0.47 in

Weather protection: IP65 with the supplied protective boot correctly installed

Switched conductor: Positive

Negative connection: Shared common-negative return; not switched

Solar connection: One outside switch terminal

Adapter connection: Opposite outside switch terminal

System output: Center common terminal

Output destination: Capillary thermostat COM terminal

Operating behavior: The toggle remains in SOLAR or ADAPTER until manually moved to OFF or the opposite source

1. Set the existing system to OFF and disconnect both the solar panel and DC adapter.
2. Confirm the replacement switch is marked ON-OFF-ON without parentheses. Do not install a momentary (ON)-OFF-(ON) switch.
3. Insert the threaded switch body through the prepared 12 mm enclosure hole.
4. Install the supplied mounting hardware and waterproof boot according to the switch instructions.
5. Tighten the mounting nut only until the switch is secure and the boot seal is evenly compressed.
6. Identify the switch common terminal and both outside terminals using the supplied diagram and a continuity test. Do not rely solely on terminal position.
7. Connect the solar-panel positive wire to the terminal corresponding to the SOLAR position.
8. Connect the fused adapter-positive wire from the WAGO 221 and RUEF110 assembly to the terminal corresponding to the ADAPTER position.
9. Connect the switch common terminal to the capillary thermostat COM terminal.
10. Leave the solar, adapter and fan negative wires connected to the common-negative return. Do not route negative through the selector.
11. Tighten each screw terminal securely and gently tug-test every connected wire.
12. Route the wires so they cannot pull on the switch, contact sharp edges or interfere with the thermostat capillary tube.
13. Reinstall all enclosure covers and seals before reconnecting power.
14. Label the three switch positions SOLAR, OFF and ADAPTER.
15. Test each position separately. Confirm the fan operates from solar in SOLAR, remains off in OFF and operates from the adapter in ADAPTER when the thermostat calls for fan operation.

• Selector Switch Installation Guide
• Durvela Solar Aeration Wiring Summary

• Use only a maintained ON-OFF-ON switch. A momentary (ON)-OFF-(ON) model will return to OFF when released and will not provide continuous fan operation.

• Always disconnect both the solar panel and DC adapter before opening the enclosure or changing switch wiring.

• Verify the common and throw terminals by continuity test before installation. Terminal arrangements can differ between switch models.

• Switch only the positive supply conductors in this Durvela configuration. The negative conductors remain connected to the common-negative return.

• The adapter-positive wire must pass through the RUEF110 resettable fuse assembly before reaching the selector switch.

• Never connect the solar and adapter positive wires directly together.

• Do not bypass the center OFF position, RUEF110 fuse, thermostat or WAGO connections.

• The waterproof boot protects the switch from the front of the panel only when installed and tightened correctly.

• The final enclosure protection rating depends on the switch seal, mounting hole, cable entries and all other enclosure seals.

• This selector provides manual source selection. It does not automatically transfer between solar and adapter power.

• Use only a regulated 12 VDC, center-positive adapter for backup power.

• This product is intended for low-voltage Durvela equipment. It is not intended for household AC wiring.