Switching functions in a solid state timer are provided by ______.

In a solid-state timer, the switching functions are primarily provided by silicon-controlled rectifiers (SCRs). SCRs are semiconductor devices that can conduct current in one direction when triggered, allowing them to control power flow based on timing sequences. This makes them ideal for timing applications because they can switch on and off very quickly, providing precise control over timing operations.

Transistors can also be used in timing circuits, but they typically function as amplifiers or switches in different configurations. Relays, which are electromechanical devices, provide switching functions, but they are not considered "solid state" as they rely on mechanical movement. Fuses serve a different purpose, functioning as protective devices to prevent overcurrent conditions rather than providing any switching capability in a timing context.

Thus, SCRs stand out as the appropriate choice for implementing switching functions within a solid-state timer due to their solidity, reliability, and efficient switching capabilities while ensuring precise time control.