Abb Technology Ag

Hitachi Energy Switzerland Ag

Abb Schweiz Ag

Abb Technology Ltd

Staffan Jacobsson

Francesco Agostini

Daniel Staffas

Jakub Korbel

Sami Kotilainen

Johannes Tredoux

Richard Thomas

Mats Holman

Benny Wedin

Brian Christopher

Matt D Cuppett

Anders Hell

Provided is a spring drive cam for a spring drive of a circuit breaker including a disc-like shape configured for rotating around a rotation axis in the spring drive, whereby the disc-like shape comprises a radius (R) that changes depending on an angle (&#x3b1;) of the radius (R) relative to a base angle (&#x3b1;), and whereby a rate (dR/d&#x3b1;) defined by a change of the radius (R) per change of the angle (&#x3b1;) is &#x2264;0.3 mm/&#xb0;.

Spring drive cam for a spring drive of a circuit breaker

The invention describes a spring arrangement for spring drive unit, which spring arrangement comprises a spring, a pullrod connected at a first pullrod end to a first spring end of the spring and connected at an opposite second pullrod end to a rotary shaft of the spring drive unit, a frame plate against which a second spring end of the spring is mounted and the frame plate being provided with an opening through which the pullrod extends to be connected to the shaft. Further, the first spring end of the spring, to which the pullrod is connected, is unguided, and the parameters of the spring are chosen in response to the operating conditions of the spring drive unit such that the spring is stable during operation.

Spring arrangement for spring drive unit and spring drive unit comprising spring arrangement

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Grangärde, Sweden

Staffan Jacobsson