over heating imersion timer switch.
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mark c
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Joined: Sat Nov 07, 2009 11:15 am

over heating imersion timer switch.

by mark c » Sun Nov 08, 2009 11:36 am

have imersion tank on timer switch.
switch started to mailfunction.
on inspection i found that both live terminals connecting blocks (supply in and out) had melted.
could anyone supply a reason for this and how to avoid it happening again.

hamish72
Tradesman
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Posts: 27
Joined: Sun May 25, 2008 6:11 pm

Re: over heating imersion timer switch.

by hamish72 » Mon Nov 09, 2009 7:08 pm

[quote="mark c"]have imersion tank on timer switch.
switch started to mailfunction.
on inspection i found that both live terminals connecting blocks (supply in and out) had melted.
could anyone supply a reason for this and how to avoid it happening again.[/quote]

Probably simply screws not tight enough which creates resistance and thus heat at the terminal

Or the switch not rated high enough to match the heater load

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