What type of switches are in D yard?

• A. Automatic Safety Switches
• B. Manual Safety Switches
• C. Automatic Circuit Breaker Switches
• D. Relay Switching

Answer: (A)

In a yard, the priority is rapid, automatic protection that can isolate a circuit when something goes wrong, even if no one is present to act. An automatic safety switch does exactly that: it detects abnormal conditions through protection relays and opens the circuit to stop fault current, keeping people and equipment safe and preventing damage.

This automatic action is what makes it the best fit for a yard environment. Manual safety switches require a person to flip them to disconnect, which introduces delay and potential risk during faults. Relay-controlled control devices (relay switching) are about triggering other parts of the system, not providing the immediate, guaranteed safety isolation by themselves. And while automatic circuit breakers interrupt current automatically, the term here points to a safety switch designed for quick, reliable isolation as part of a safety and protection scheme.