Operating mechanism for a four-pole circuit breaker

An operating mechanism for a four-pole circuit breaker for simultaneously operating the four poles, the four poles being arranged side-by-side along a transverse direction such that a main pole is adjacent to a symmetry plane and an auxiliary pole is furthest away from the main pole, the auxiliary pole including a rotary elementary switching bar rotatable around a first transverse axis, at least one stationary contact, and a rotary contact cooperable with said at least one stationary contact, the rotary contact being rotatably coupled to the rotary elementary switching bar via at least one contact pressure spring, said operating mechanism comprising:

• a main opening and closing mechanism connected to said main pole;
• an auxiliary opening and closing mechanism connected to said auxiliary pole, said auxiliary opening and closing mechanism comprising spring means for exerting a torque on the rotary elementary switching bar in a closed position of the circuit breaker, said torque opposing a force exerted by the contact pressure spring on the rotary elementary switching bar, said spring means being arranged so as to exert substantially no torque on the rotary elementary switching bar when the circuit breaker is in an open position;
• and
• coupling means for coupling said main opening and closing mechanism and said auxiliary opening and closing mechanism to each other.