What type of switch is often used in circuits that must be operated only in emergencies?

The type of switch that is often used in circuits that must be operated only in emergencies is a guarded switch. These switches are designed to prevent accidental operation, ensuring that they are only activated intentionally during emergencies. Their construction typically includes features such as covers or barriers that protect the switch from unintended activation, thereby making them suitable for critical applications where safety is paramount.

In contrast, standard switches lack these protective features, which can lead to hazards if they are inadvertently activated. Guarded switches are specifically engineered to mitigate these risks, making them the preferred choice for emergency situations where a quick response is needed, but risk of accidental triggering must be minimized.