Clamp-on current sensor

A clamp-on magnetic sensor, comprising:

• a U-bar first magnetic core section comprising a central segment connected to first and second end segments, the first end segment having a first end segment end and the second end segment having a second end segment end, the first end segment extending in a first direction, the second end segment extending in a second direction, the first and second directions forming an angle of less than 90 degrees, a first cavity having a first surface contour formed by a surface of the first end segment and having a deepest first cavity position which is a first distance from the first end segment end, a second cavity having a second surface contour formed by a surface of the second end segment and having a deepest second cavity position which is at a second distance from the second end segment end, the first and second cavities facing one another and their deepest positions being separated by an end segment spacing distance;
• a coil core comprising a second magnetic core section and a coil including a plurality of windings wound around the second magnetic core section, the second magnetic core section having a first coil core end with a curved or pointed surface contour that mirrors the first surface contour of the first cavity, the second magnetic core section having a second coil core end with a curved or pointed surface contour that mirrors the surface contour of the second cavity, the coil core having a coil core length between the first and second coil core ends;
• wherein when the first coil core end presses against the first cavity and the second coil core end presses against the second cavity, the coil core is gripped by the U-bar such that the surface contour of the first coil core end is flush with the first surface contour of the first cavity and the surface contour of the second coil core end is flush with the second surface contour of the second cavity.