An apparatus includes an enclosure, a power switch, a cable actuator, a power converter and a manual switch. The enclosure may be mechanically attachable to an external side of an industrial control panel. The power switch may be configured to switch electrical power. The cable actuator may be configured to control the power switch and may have an end connectable to a power disconnect handle of the industrial control panel. The power switch may be open while the power disconnect handle is in an off position and closed while the power disconnect handle is in an on position. The power converter may be configured to generate low-voltage power from the electrical power. The manual switch may be configured to switch the electrical power from a line side of the power switch to the power converter. A wire may transfer the low-voltage power through at least one aperture.