123A 2p 600Vdc circuit breaker is a two-pole (2p) direct current (dc) miniature circuit breaker (MCB) with a 123 Ampere (123A) rating and a maximum voltage of 600 Volts (600Vdc). It's designed to protect electrical circuits from overcurrents and short circuits, commonly used in solar power systems and other DC applications. The "2p" designation indicates that it can interrupt the current flow in two conductors, making it suitable for single-phase circuits or two-wire DC systems. Here's a breakdown of the key features: 123A Rated Current: This is the maximum current the breaker can carry continuously under normal operating conditions. 2-Pole (2p): The breaker has two poles, meaning it can interrupt the current flow in two separate conductors. 600Vdc Rated Voltage: The breaker is designed to operate at a maximum voltage of 600 volts DC. DC Application: It is specifically designed for use in direct current (DC) circuits, such as those found in solar power systems. Overload and Short Circuit Protection: Like all circuit breakers, it protects the circuit from damage caused by excessive current flow due to overloads or short circuits. Miniature Circuit Breaker (MCB): This indicates that it is a smaller, more compact type of circuit breaker, typically used for lower current applications. Common Use Cases: These breakers are commonly found in solar power combiner boxes, battery systems, and other DC applications where overcurrent protection is needed.