An electro-luminescent display includes a current mirror for supplying uniform drive currents to the electro-luminescent diodes of the electro-luminescent display. The insert has a chip breaker with a base that extends from the secondary cutting edge to the primary cutting edge. Spacers or blockouts may be mounted between the guardrail beams and the posts to offset the posts from the guardrail beams. Additionally, the turbine includes a body with vanes, each having tips, and the endplates are sized and shaped such that their peripheral edges extend beyond the tips. 0 mm, inclusive; the number of the projections 1P is in a range between 5 and 60, inclusive, per cm2 on the outer circumferential surface; the area ratio of regions each encircled by a contour line of a height of 0. Each voltage sensor detects a voltage variation supplied on its respective first sensing terminal and generates on the respective second sensing terminal an activation potential for the respective power switch.