Heatmiser UH1 F1 fuse size
- Thread starter dt1
- Start date
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https://www.heatmiser.com/contact/ There's nothing found via the interweb showing the fuse ratings.
It's normal to print the fuse rating on the PCB if using skeleton fuse holders. But 20mm fuses pretty much invariably have the ratings stamped around the metal end caps.
Any pics of what is there? (/was in there?).
It's normal to print the fuse rating on the PCB if using skeleton fuse holders. But 20mm fuses pretty much invariably have the ratings stamped around the metal end caps.
Any pics of what is there? (/was in there?).
Thanks for the reply
The customer has had issues previously and fuse has been replaced. There was a faulty actuator that I’ve replaced and the fuse that was installed was a fast blow 2A. However, the fuse installed for the thermostats is a 2A slow blow so I don’t see why the actuators would be fast blow as they would be more power heavy than the thermostats.
I plan to contact Heatmiser on Monday was just curious if anyone was aware of the correct sizing.
The customer has had issues previously and fuse has been replaced. There was a faulty actuator that I’ve replaced and the fuse that was installed was a fast blow 2A. However, the fuse installed for the thermostats is a 2A slow blow so I don’t see why the actuators would be fast blow as they would be more power heavy than the thermostats.
I plan to contact Heatmiser on Monday was just curious if anyone was aware of the correct sizing.
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https://www.ebay.co.uk/itm/266878545929 is the PCB I think. No fuse rating markings! Doh!!! {I'd be adding a label with the correct fuse ratings if I were you! once you get that info from the makers.}
F1 Actuators: Looks to be a ceramic (sand filled, high rupture current) fuse to my eyes - same as the mains input fuse, F2.
F3 & F4 are glass time delay / anti-surge fuses.
Ceramic fuses should always be used in replacements as the glass style can shatter when ruptured under fault conditions. They are available in fast and time delay, too.
Heatmiser Thermal Actuators are 2 Watts at 230 Volts each. Let's be a devil and allow a 10x inrush current (same as an old fashioned tungsten lamp) so 0.1 amp initially... 8 of 'em makes 0.8 Amps inrush and 0.08 A running. So a 2 A fast blow would be more than adequate operationally. (IMHO). In ceramic of course.
F1 Actuators: Looks to be a ceramic (sand filled, high rupture current) fuse to my eyes - same as the mains input fuse, F2.
F3 & F4 are glass time delay / anti-surge fuses.
Ceramic fuses should always be used in replacements as the glass style can shatter when ruptured under fault conditions. They are available in fast and time delay, too.
Heatmiser Thermal Actuators are 2 Watts at 230 Volts each. Let's be a devil and allow a 10x inrush current (same as an old fashioned tungsten lamp) so 0.1 amp initially... 8 of 'em makes 0.8 Amps inrush and 0.08 A running. So a 2 A fast blow would be more than adequate operationally. (IMHO). In ceramic of course.
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