Relay coil assembly

A relay coil assembly, comprising:

• a bobbin, provided with two flanges on two ends, a winding window of the bobbin being formed between the two flanges;
• an enameled wire, wound in the winding window;
• a coil pin comprising an insertion portion, an enameled wire fixing portion and a signal wire fixing portion, the coil pin is mounted to the flange on one of the ends of the bobbin through the insertion portion, the signal wire fixing portion is provided with a first engagement recess with an opening facing downward;
• and
• a signal wire, engaged in the first engagement recess;
• wherein an inverted hook is provided at one of two recess sidewalls of the first engagement recess and near an edge of the opening, and a slope section is provided at one of the two recess sidewalls of the first engagement recess at a location corresponding to the signal wire, the opening gradually enlarges from inside to outside along the slope section, so that when a force is applied to outside of one of the recess sidewalls provided with the inverted hook, the slope section is capable to squeeze the signal wire into the first engagement recess and the inverted hook is capable to prevent the signal wire from coming out.