Final answer:
The operation of circuit switchers can indeed be initiated in various ways, including manual, remote control, or automatically through relays, which is a true statement, with circuit breakers being notable for their resettable nature and safety features.
Step-by-step explanation:
The statement that circuit switchers can be operated manually, by remote control, or by relays that automatically sense system conditions or faults is true. This is supported by the information which indicates that circuit breakers and fuses act to interrupt excessive currents that can cause thermal hazards by automatically opening when the current exceeds safe limits. Moreover, circuit breakers can be reset, which separates them from fuses that need to be replaced once they have operated due to an excessive current. Additionally, safety devices like the Ground Fault Interrupters (GFIs) and isolation transformers provide protection against electrical hazards by recognizing and interrupting unintended current paths or by insulating the device from the power source, respectively. These protective devices are crucial for preventing both thermal and electrical shock hazards, using principles such as induction to function effectively.