What is the main purpose of a bell alarm in electrical systems?

The main purpose of a bell alarm in electrical systems is to signal a fault in the circuit breaker. This type of alarm is designed to actively alert operators or technicians when there is an abnormal condition or failure within the electrical system, specifically indicating that the circuit breaker has opened due to an overload, short circuit, or another fault scenario. By providing an audible notification, the bell alarm allows for swift identification and response to issues that could potentially lead to equipment damage or safety hazards.

When understanding the context, it's clear that other options do not align with the primary function of a bell alarm. For instance, while indicating normal operation is essential for understanding the state of the system, this is typically reflected through visual indicators or normal operation signals, rather than an alarm. Additionally, confirming battery status is a function more associated with battery management systems, and monitoring voltage supply pertains to voltage measurement devices, not alarms. Therefore, the singular focus of the bell alarm as a fault notification mechanism solidifies its importance in maintaining safety and operational integrity within electrical systems.