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SPD Protection.

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I recently bought a 1 metre long two way 13 Amp trailing socket extension lead. It contains a varistor with a thermal fuse attached to its side, and two neon indicators. It is well made and clearly has been designed well. The varistor is connected to L. and N. The thermal fuse is held tightly on one side of the varistor disc. Neon light 1 indicates mains present. Neon light 2 indicates that the varistor is still in circuit and that the thermal fuse is still intact.

Total cost delivered= less than £9.00. Compare that cost with the units designed for permanent installations.

Varistor - Wikipedia

Z.

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    The varistor is connected to L. and N. 

    Compare that … with the units designed for permanent installations.

    Is missing ⅔rds of the protection - nothing L-PE or N-PE  (perhaps OK if you only use Class II equipment, but a waste of £9 as far as any Class I equipment is concerned)

    The other big difference is likely to be the size of surge it's capable of withstanding, and the level of protection it provides downstream …. not known of course, but experience suggests that the highest quality is rarely found in the bargin basement.

       - Andy.

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  • 0

    The varistor is connected to L. and N. 

    Compare that … with the units designed for permanent installations.

    Is missing ⅔rds of the protection - nothing L-PE or N-PE  (perhaps OK if you only use Class II equipment, but a waste of £9 as far as any Class I equipment is concerned)

    The other big difference is likely to be the size of surge it's capable of withstanding, and the level of protection it provides downstream …. not known of course, but experience suggests that the highest quality is rarely found in the bargin basement.

       - Andy.

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