Circuit breaker interlocking mechanism

A power transfer device for switching from one power supply to another,

• (a) four circuit breakers in side-by-side fixed alignment in a row, each of the circuit breakers having a top wall and a handle projecting therefrom and movable between "on" and "off" positions,
• (b) the first and second circuit breakers in the row having separate line terminals and common load terminals,
• (c) the third and fourth circuit breakers in the row having separate neutral terminals and common load terminals,
• (d) first tie means interconnecting the handles of the first and fourth circuit breakers into pairs for simultaneous movement,
• (e) second tie means interconnecting the handles of the second and third circuit into pairs for simultaneous movement,
• (f) the first and second tie means each comprising a rigid tie member to enable operation of corresponding pairs of tied handles, and
• (g) a locking plate pivotally mounted for movement between the paths of movement of the pairs of tied circuit breaker handles, whereby movement of either of the pairs of tied handles to the "on" position pivots the locking plate into the path of movement of the other pair to prevent movement to the "on" position.