Relay Spool Flange Structure for Core-Terminal Insulation

The spool flange utilizes a stepped configuration with multiple surfaces (first front surface, second front surface, third front surface) arranged in different spatial dimensions. The second front surface is spaced rearward from the first front surface by a distance greater than the thickness of the contact support portion, creating a multi-dimensional insulation barrier that increases the insulation distance between the iron core and fixed terminal without simply extending the relay in one direction.

The insulation structure is localized to specific regions of the spool flange rather than uniformly distributing the insulation distance throughout the entire relay. The stepped flange design concentrates the insulation function at critical locations where the first, second, and third front surfaces create localized insulation barriers, allowing the relay to maintain a compact overall size while achieving sufficient insulation at key points.

The spool flange is segmented into multiple functional surfaces (first front surface, second front surface, third front surface) that perform distinct insulation functions. Each surface is positioned at a different rearward distance from the head portion, creating a segmented insulation strategy where each segment contributes to the overall insulation distance requirement without requiring a single complex extended structure.

The stepped flange structure serves multiple functions simultaneously: it provides mechanical support for the contact support portion, creates insulation barriers at multiple distances, and maintains the structural integrity of the spool assembly. This multi-functional design achieves enhanced insulation without adding separate dedicated insulation components, thereby limiting the increase in shape complexity.