- Sullins Connector Solutions headquartered in San Marcos, CA, has been a world leader in the design, engineering, and manufacturing of high-quality edge cards and headers since 1971. Sullins Connector Solutions provides the industry’s widest selection of UL/CUL approved edge cards, and additionally offers product development services together with engineering support. Sullins Connector Solutions' edge cards, headers, bi-level, high density, and high temperature connectors are widely specified for use in mission-critical applications by a broad spectrum of leading industrial, commercial, military and consumer products manufacturers. Sullins Connector Solutions' connectors and interconnect systems are offered through a global network of sales representatives and distributors.