A switching device (100) for opening and closing a circuit is provided. The switching device comprises a bus-bar tank (110) having a first end (110a) and a first bushing (122) coupled to the first end of the bus-bar tank. The switching device also comprises a circuit-breaker tank (112) having a first end (112a). The switching device further comprises a stationary contact (126) supported by the first bushing. The switching device also comprises a circuit-breaker arrangement (130) arranged inside the circuit-breaker tank. Herein, a fastening arrangement (124) is adapted to establish physical connection between the first end of the circuit-breaker tank and the first bushing, to removably assemble the bus-bar tank and the circuit-breaker tank. Further, the circuit-breaker arrangement is adapted to extend into the first bushing, and to be disposed in contact with the stationary contact therein, when the bus-bar tank is assembled to the circuit-breaker tank.