installed position within the circuit breaker base 12 in a 3 pole system i e corresponding with three phases of current three rotary cassettes outboard cassettes 28 and center cassette 22 are concurrently operated by an operating mechanism as described hereinafter a toggle handle 11 allows for the manual operation of cassettes 22 28 auxiliary switch 18 includes a pair of electrical contacts not shown for external connection to a control monitoring circuit not shown and a depressible plunger 66 which opens and closes the auxiliary switch contacts sockets 16 include an aperture 15 through which plunger 66 extends and a ledge 17 upon which the bottom of auxiliary switch 18 rests referring now to fig2 and 3 a circuit breaker operating mechanism 20 is shown positioned over center cassette 22 by rods 24 and 26 rods 24 and 26 also position outboard cassettes 28 adjacent to center cassette 22 fig2 also illustrates an auxiliary switch actuation mechanism 50 the auxiliary switch actuation mechanisms 50 feature a pair of pivotally mounted levers 52 which fit over the outboard cassettes 28 and pivot about rod 24 each actuation mechanism 50 includes an activation spring 54 which is secured about post 55 and positioned on the outside surfaces of center cassette 22 each lever 52 is generally l shaped and further includes a lip 60 located along a horizontal section 62 thereon the function of the lip 60 will be described in greater detail later lever 52 also has a foot 64 located at the end of its vertical section 58 and adjacent the lobe 56 referring now to fig4 and 5 center cassette 22 includes a rotary contact assembly 27 including a rotary contact arm 30 rotatably mounted therewithin it should be noted that each cassette including outboard.