SM2 control discrepancy switch
The control discrepancy switch is used not only to control the circuit breakers and disconnectors, but also to monitor and display its switch status in mimic diagrams and illuminated circuit diagrams that depict the switch front as a switch symbol. Once illuminated, this shows that the position of the control discrepancy switch does not correspond to the assigned circuit breaker. The control discrepancy switch may be used in the preselection circuit – i.e. the new switch position is preselected by changing the switch symbol in the mimic diagram. Only then is the switching command issued for the circuit breaker. The control discrepancy switch can also be used when first activated and once the new switch status has been acknowledged.
The discrepancy control switch is made up of a parcel counter with 9 switch levels, the control button complete with lighting mechanism, and a switch lock that has 2 staggered position settings of 90°. A further 45° rotation from these positions can also be made in the same direction; however, the switch button must be pressed. The switch then springs back to the respective 90° position when releasing the switch button. The 90° rotary switch is for acknowledgement (message switch) and the +45° turn/press switch for controlling (control switch).
Two models are available, both of which feature a square, black front panel that can also be removed depending on requirements. As for the control button design, this has been selected to fit in with the overall aesthetic of the switchboard.