Final answer:
The incorrect statement is number 4, which incorrectly suggests that a rupture member ruptures due to temperature instead of pressure.
Step-by-step explanation:
The incorrect statement among the options provided is statement number 4: "A rupture member automatically ruptures at a predetermined temperature." This statement is incorrect because a rupture member, also known as a rupture disk, is designed to burst at a predetermined pressure, not specifically temperature; though temperature can affect the pressure at which a rupture disk will burst. On the other hand, a fusible plug, as mentioned in statement 3, is designed to melt at a set temperature to relieve pressure, typically used in applications like steam boilers to provide a safety mechanism against excessive pressure build-up.
Statement 1 describes a service valve accurately as it is indeed used to shut off the flow of fluids in a system for maintenance or installation purposes. Statement 2 correctly explains brine as it is commonly used in refrigeration or heating systems for the transfer of heat, due to its capacity to carry substantial amounts of thermal energy.
As for the reference information, it details the operation of electrical safety devices like fuses and circuit breakers, which serve to protect electrical circuits from damage due to excess current, by breaking the connection in case of overheating.