Abstract: A spring operated actuator for an electrical switching apparatus. It includes an opening spring, a closing spring and a damper for the closing. The damper is a rotary air damper with components that rotate relative to each other and has air as working medium for the dampening.

Abstract: A spring operated actuator for an electrical switching apparatus. The actuator has a main shaft transmitting the actuation movement to the switching apparatus and has opening spring means and closing spring means. The opening spring means includes an opening torsion spring and the closing means includes a closing torsion spring. The axes of the torsion springs extend in the same direction and at a distance from each other that is less than 20% of the external opening spring diameter.

Abstract: A spring operated actuator for an electrical switching apparatus. It has an opening spring and a closing spring, one of them including a torsion spring. The torsion spring is charged in the unwinding direction and discharged in the winding direction.

Abstract: A spring operated actuator for an electrical switching apparatus. It includes an opening spring, a closing spring and a damper for the closing. The damper is a rotary air damper with components that rotate relative to each other and has air as working medium for the dampening.

Abstract: A spring operated actuator for an electrical switching apparatus. The actuator has a main shaft transmitting the actuation movement to the switching apparatus and has opening spring means and closing spring means. The opening spring means includes an opening torsion spring and the closing means includes a closing torsion spring. The axes of the torsion springs extend in the same direction and at a distance from each other that is less than 20% of the external opening spring diameter.

Abstract: A spring operated actuator for an electrical switching apparatus. It has an opening spring and a closing spring, one of them including a torsion spring. The torsion spring is charged in the unwinding direction and discharged in the winding direction.

Abstract: The invention relates to spring protection device for a spring drive unit and adapted to surround a spring of the spring drive unit, the protection device comprising a frame plate, against which a first end of the spring rests, and the frame plate being provided with an opening passage for a pullrod connected to the spring. The spring protection device comprises bars with first end parts that are connected to the frame plate, externally of the first end of the spring, and which bars are arranged to extend externally of and along the sides of the spring and externally of a second end of the spring, thereby forming an open cage surrounding the spring. The invention also relates to a spring drive unit comprising a spring protection device.