A state-indicating device linked to a circuit breaker indicating the status thereof with test function, said circuit breaker having an On/Off function and a Signal Default function, wherein said state-indicating device comprises: - a housing; - a microswitch assembly attached within said housing, said microswitch assembly comprising at least one microswitch button; - a mechanical linkage linked to said microswitch assembly, and configured to selectively operate said microswitch assembly, wherein said mechanical linkage comprises: - a mechanical plate; - a lever, - a test function actuator coupled with said lever - a tripping assembly mounted on said mechanical plate; and - an actuator coupled with said tripping assembly and configured to: - actuate said microswitch button based on signals corresponding to said On/Off function, said Signal Default function and a combination of said SD function and said OF function (SD+OF) that allow said microswitch assembly to change from Normally Open state to Normally Close state, and vice versa; and - indicate the trip status of the circuit breaker linked to said state-indicating device, characterized in that said test function actuator is configured to actuate said microswitch button without operating said actuator to perform a test of a make or break operation with said lever without switching ON said circuit breaker linked to said state-indicating device. - a housing; - a microswitch assembly attached within said housing, said microswitch assembly comprising at least one microswitch button; - a mechanical linkage linked to said microswitch assembly, and configured to selectively operate said microswitch assembly, wherein said mechanical linkage comprises: - a mechanical plate; - a lever, - a test function actuator coupled with said lever - a tripping assembly mounted on said mechanical plate; and - an actuator coupled with said tripping assembly and configured to: - actuate said microswitch button based on signals corresponding to said On/Off function, said Signal Default function and a combination of said SD function and said OF function (SD+OF) that allow said microswitch assembly to change from Normally Open state to Normally Close state, and vice versa; and - indicate the trip status of the circuit breaker linked to said state-indicating device, characterized in that - a mechanical plate; - a lever, - a test function actuator coupled with said lever - a tripping assembly mounted on said mechanical plate; and - an actuator coupled with said tripping assembly and configured to: - actuate said microswitch button based on signals corresponding to said On/Off function, said Signal Default function and a combination of said SD function and said OF function (SD+OF) that allow said microswitch assembly to change from Normally Open state to Normally Close state, and vice versa; and - indicate the trip status of the circuit breaker linked to said state-indicating device, characterized in that - actuate said microswitch button based on signals corresponding to said On/Off function, said Signal Default function and a combination of said SD function and said OF function (SD+OF) that allow said microswitch assembly to change from Normally Open state to Normally Close state, and vice versa; and - indicate the trip status of the circuit breaker linked to said state-indicating device, characterized in that said test function actuator is configured to actuate said microswitch button without operating said actuator to perform a test of a make or break operation with said lever without switching ON said circuit breaker linked to said state-indicating device.