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OnBuy.com£14.75Visit shop Deta S1391wh Double Pole Immersion Heater Switch With Neon 20 Amp 'Water Heater' 5029163113919
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B&Q£15.65Visit shop B&Q - S1391Wh Slimline Double Pole Switch With Neon 20 Amp Marked Water Heater
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The Deta S1391WH is a slimline, 20-amp double pole isolator switch designed specifically for the safe control of immersion heater circuits in residential and commercial settings. It is ideal for electricians and homeowners looking for a clearly labeled, reliable isolation point that includes a built-in neon indicator for visual confirmation of power status, though it requires professional installation by a qualified individual due to the nature of electrical wiring.
| Model Part Number | S1391WH |
|---|---|
| Brand | Deta |
No, the S1391WH is not waterproof. It is intended for indoor use in dry environments.
No, electric showers typically require a higher amperage rating (usually 45A or higher) and should not be used with a 20A switch.
The switch is a faceplate unit; a standard electrical back box must be purchased separately if one is not already installed.
Electrical installations should be carried out by a competent person. If you are not confident with wiring, please consult a qualified electrician.
A double pole switch disconnects both the live and neutral wires, which is safer and considered best practice for immersion heaters.
Verify that the circuit breaker is on and use a multimeter to ensure power is reaching the switch terminals.
Check the mounting screws for tightness and ensure no debris is obstructing the rocker mechanism.
Turn off power immediately and have a qualified electrician inspect for loose connections or high-resistance heating.
This switch is designed for standard flush or surface mounting depending on the back box depth. Ensure that the circuit is fully de-energized before beginning installation. Use appropriately rated cabling for a 20A circuit to prevent overheating. Maintenance is minimal; however, you should periodically inspect the faceplate for any signs of heat discoloration or damage. Clean the switch using a dry, lint-free cloth; avoid using harsh chemicals or abrasive cleaners which may damage the finish or the indicator lens. If the neon light fails, the unit should be inspected by a professional to ensure the internal connections remain secure.
