Darktrax
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The device is a thyristor-based item used for soft-starting electric motors.
There are several good brands, but in this case, it is an older Schneider (Telemecanique LH4) type, which can be used for both 3-phase and single phase motors.
Not mentioned at all in the data sheets, but only at the end of an FAQ brochure, it says that a single phase motor can be started "provided it is an asynchronous squirrel cage motor, not a motor with a commutator".
If anyone knows, (or can offer a speculation), what is so special about a single-phase AC brushes+commutator motor as a load, compared to induction motors, that might be a problem for a thyrister based phase-angle switcher?
There are several good brands, but in this case, it is an older Schneider (Telemecanique LH4) type, which can be used for both 3-phase and single phase motors.
Not mentioned at all in the data sheets, but only at the end of an FAQ brochure, it says that a single phase motor can be started "provided it is an asynchronous squirrel cage motor, not a motor with a commutator".
If anyone knows, (or can offer a speculation), what is so special about a single-phase AC brushes+commutator motor as a load, compared to induction motors, that might be a problem for a thyrister based phase-angle switcher?