A state-indicating device linked to a circuit breaker indicating the status thereof with test function, said circuit breaker having an On/Off (OF) function and a Signal Default (SD) 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 (OF) function , said Signal Default (SD) function and a combination of said SD function and said OF function (SD+OF) that allow said microswitch assembly to change from Normally Open (NO) state to Normally Close (NC) 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 (OF) function , said Signal Default (SD) function and a combination of said SD function and said OF function (SD+OF) that allow said microswitch assembly to change from Normally Open (NO) state to Normally Close (NC) 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 (OF) function , said Signal Default (SD) function and a combination of said SD function and said OF function (SD+OF) that allow said microswitch assembly to change from Normally Open (NO) state to Normally Close (NC) 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 (OF) function , said Signal Default (SD) function and a combination of said SD function and said OF function (SD+OF) that allow said microswitch assembly to change from Normally Open (NO) state to Normally Close (NC) 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 . <EOS>