True or False? A normally closed contact will open during an alarm event in a protective loop.

• A. True
• B. False
• C. Only if the loop is broken
• D. It depends on the configuration

Answer: (B)

A normally closed contact is designed to remain closed under normal operating conditions, allowing current to flow through the circuit. In the context of a protective loop, these contacts are typically used in alarm systems or safety circuits. When an alarm event occurs, the condition that triggers the alarm will make the contact open, thereby interrupting the current flow.

However, stating that the answer is false means that a normally closed contact does not open during an alarm event, which is misleading because its purpose is to respond to certain conditions, including alarms, by opening. The design of the circuit allows for this action to create a signal indicating that there is an issue, thus confirming the function of a normally closed contact in such scenarios. Hence, it can be concluded that the correct understanding involves recognizing that these contacts indeed open during alarm conditions to perform their safety function.