Abstract: An apparatus includes a surge protection device, a current sensor configured to sense a current through the surge protection device, and a surge discriminator circuit coupled to the current sensor and configured to discriminate among a plurality of surge levels for the surge protective device responsive to the sensed current. The current sensor may include a current transformer configured to generate a secondary current responsive to the sensed current and the surge discriminator circuit may be configured to discriminate among a plurality of surge levels responsive to the generated secondary current.

Abstract: An apparatus includes a surge protection device, a current sensor configured to sense a current through the surge protection device, and a surge discriminator circuit coupled to the current sensor and configured to discriminate among a plurality of surge levels for the surge protective device responsive to the sensed current. The current sensor may include a current transformer configured to generate a secondary current responsive to the sensed current and the surge discriminator circuit may be configured to discriminate among a plurality of surge levels responsive to the generated secondary current.

Abstract: An apparatus includes a surge protection device, a current sensor configured to sense a current through the surge protection device, and a surge discriminator circuit coupled to the current sensor and configured to discriminate among a plurality of surge levels for the surge protective device responsive to the sensed current. The current sensor may include a current transformer configured to generate a secondary current responsive to the sensed current and the surge discriminator circuit may be configured to discriminate among a plurality of surge levels responsive to the generated secondary current.

Abstract: A composite selector fork arrangement adapted to cooperate with a selector shaft to resist rotational and translational movement relative to the selector shaft. The arrangement also being adapted to cooperate with a selector sleeve to effect translational movement of the selector sleeve. The arrangement including a first and second metallic portion. The first metallic portion being arranged to impart stiffness to the fork arrangement in a direction generally in line with the axial extent of a selector shaft and the second metallic portion being arranged to impart stiffness to the fork arrangement in a direction generally transverse to the axial extent of a selector shaft. The arrangement including a non-metallic portion being arranged to at least partially surround the first and second portions, and in which, in use, the non-metallic portion cooperates with a selector shaft to assist in resisting rotational movement of the selector fork arrangement relative to the selector shaft.