While the switch itself seems to be of good quality, I think that the Amazon listing could be a little misleading especially for non-EE customers (most of us).  The title lists that max current as is 20A and it is but it looks to me, and I am no expert so could be wrong, that this only applies to certain types of loads.  The information is actually in the product description in this cryptic string:
Ue : 660V;Ith : 20A
Le : AC-15 4A/5AAC-3 5.5AAC-2 7.5AAC-4 1.5A
The AC-15, AC-3 and AC-4 codes appear to tell you the maximum current for specific "utilization categories".  With literally hours of research, what I believe this means is that the highest load for the blower motor I want to use this on (AC-3 Squirrel cage motor), the maximum current rating is 5.5 amps, a far cry from the 20 amp maximum rating.  Again, I am a novice so I could be misunderstanding what I have read but my 1/2 HP motor uses 9 amps at maximum speed (12-13 amps to start) so this might not be the right switch to use for blower motor control.  If they are going to list an item on a retail site like Amazon, they should really decipher the codes designed for electrical engineers to help prevent the rest of us from using this in an application it is not designed for.  At a minimum, they should provide links to the data sheet which I cannot find anywhere on the internet.  The only application that I have been able to find this described for on other websites is switching between lines for an ammeter.  So unless you know how to interpret the technical specs, find a product that is designed for your specific application.
While the switch itself seems to be of good quality, I think that the Amazon listing could be a little misleading especially for non-EE customers (most of us). The title lists that max current as is 20A and it is but it looks to me, and I am no expert so could be wrong, that this only applies to certain types of loads. The information is actually in the product description in this cryptic string:
Ue : 660V;Ith : 20A
Le : AC-15 4A/5AAC-3 5. 5AAC-2 7. 5AAC-4 1. 5A
The AC-15, AC-3 and AC-4 codes appear to tell you the maximum current for specific "utilization categories". With literally hours of research, what I believe this means is that the highest load for the blower motor I want to use this on (AC-3 Squirrel cage motor), the maximum current rating is 5. 5 amps, a far cry from the 20 amp maximum rating. Again, I am a novice so I could be misunderstanding what I have read but my 1/2 HP motor uses 9 amps at maximum speed (12-13 amps to start) so this might not be the right switch to use for blower motor control. If they are going to list an item on a retail site like Amazon, they should really decipher the codes designed for electrical engineers to help prevent the rest of us from using this in an application it is not designed for. At a minimum, they should provide links to the data sheet which I cannot find anywhere on the internet. The only application that I have been able to find this described for on other websites is switching between lines for an ammeter. So unless you know how to interpret the technical specs, find a product that is designed for your specific application.