This circuit trips by shorting the load to quickly blow the fuse when the voltage exceeds a certain value. The triggering voltage is set to R2. The fuse must be in accordance with the load to be protected.
This source gently applies the voltage to the load, causing it to rise slowly, thus avoiding...
This circuit was found in a 1977 Signetics manual. The 556 consists of a 555 double and the...
This circuit, found in a 1994 documentation, uses 20 A 2N5448 triacs or equivalent and should be...