A circuit breaker assembly (2;16) comprising: a plurality of controllable circuit breakers (4; 102), each of said controllable circuit breakers comprising: separable contacts, an operating mechanism structured to open and close said separable contacts, a trip mechanism cooperating with said operating mechanism to trip open said separable contacts, a first line terminal, a second load terminal, and at least a third terminal, wherein said trip mechanism is structured to trip open said separable contacts responsive to a signal from said third terminal; and a toggle electrical switching apparatus (96;100) comprising: separable contacts electrically connected between the third terminal and ground, and a toggle operating member structured to open and close the separable contacts of said toggle electrical switching apparatus, wherein said at least a third terminal is said third terminal (73, #3) and a fourth terminal (73, #6); wherein said fourth terminal is normally electrically connected to said ground and otherwise is open when said trip mechanism cooperates with said operating mechanism to trip open said separable contacts; wherein a first one of said controllable circuit breakers comprises the third terminal electrically connected to the separable contacts of said toggle electrical switching apparatus and the fourth terminal electrically connected to the third terminal of a second one of said controllable circuit breakers; and wherein a third one of said controllable circuit breakers comprises the third terminal electrically connected to fourth terminal of said second one of said controllable circuit breakers, in order to electrically slave together said first one, said second one and said third one of said controllable circuit breakers as a three-pole controllable circuit breaker. a plurality of controllable circuit breakers (4; 102), each of said controllable circuit breakers comprising: separable contacts, an operating mechanism structured to open and close said separable contacts, a trip mechanism cooperating with said operating mechanism to trip open said separable contacts, a first line terminal, a second load terminal, and at least a third terminal, wherein said trip mechanism is structured to trip open said separable contacts responsive to a signal from said third terminal; and separable contacts, an operating mechanism structured to open and close said separable contacts, a trip mechanism cooperating with said operating mechanism to trip open said separable contacts, a first line terminal, a second load terminal, and at least a third terminal, wherein said trip mechanism is structured to trip open said separable contacts responsive to a signal from said third terminal; and a toggle electrical switching apparatus (96;100) comprising: separable contacts electrically connected between the third terminal and ground, and a toggle operating member structured to open and close the separable contacts of said toggle electrical switching apparatus, separable contacts electrically connected between the third terminal and ground, and a toggle operating member structured to open and close the separable contacts of said toggle electrical switching apparatus, wherein said at least a third terminal is said third terminal (73, #3) and a fourth terminal (73, #6); wherein said fourth terminal is normally electrically connected to said ground and otherwise is open when said trip mechanism cooperates with said operating mechanism to trip open said separable contacts; wherein a first one of said controllable circuit breakers comprises the third terminal electrically connected to the separable contacts of said toggle electrical switching apparatus and the fourth terminal electrically connected to the third terminal of a second one of said controllable circuit breakers; and wherein a third one of said controllable circuit breakers comprises the third terminal electrically connected to fourth terminal of said second one of said controllable circuit breakers, in order to electrically slave together said first one, said second one and said third one of said controllable circuit breakers as a three-pole controllable circuit breaker.