What is the point of the circuit breaker in the GRACEPORT P-R62-K3RD3-M2

Even though P-R62-K3RD3-M2 is rated for 20amps some applications do not necessarily want to have the full 20amps available to its user. Therefore it can be limited by having an inline circuit breaker. example: this port is meant for plugging in service laptops and not shop vacs.