The dimension of adjustability was added so that trip points were precalculated and the user simply sets the adjustment at the FLA level of the motor. The limiting factor is that set points are still extreme. Settings are precalculated at the manufacturing level and attempts are made to generically protect yet still avoid nuisance tripping. The device is still not designed to protect against single phase or unbalance conditions. The question arises as to price vs. protection.
Electronic overloads are the newest form of overloads.
They replace thermal based protection with electrical measurements. Electronic overloads can be simple and inexpensive or quite sophisticated, premium priced devices. SymCom overloads combine the sophistication with affordability. The difference with SymCom overloads is the fact that they are programmable, have a digital readout, and allow the user to accurately set trip levels, trip classes, and time delays. In the case of Model 777, additional features include voltage protection, ground fault protection, and communication interface.