Struthers-Dunn LLC，正式名称为Struthers-Dunn或Dunco，自1923年以来一直是工业控制的制造商。

Struthers-Dunn由John Struthers-Dunn于1923年在宾夕法尼亚州费城外建立。Struthers-Dunn是美国最早的继电器制造商之一，并成为第二次世界大战期间美国政府的第一个军用继电器制造商。Struthers-Dunn的第一个军用产品101系列接触器是1938年用于海军舰艇的100A额定SPST开关。随后的开发导致美国军方产品QPL（合格产品清单）的开始，通常称为MIL-SPEC今天的产品。

在商业产品方面，Struthers-Dunn的另一个值得注意的设计是219系列工业继电器。最初设计为用于核能设施的插座兼容，高可靠性继电器，至今仍用于关键控制。 219套封装系列产品和219NE（核能）系列除了标准的机电版本外还包括236/237/238系列工业延时继电器，后来的246/247/248系列产品先进的延时继电器，255系列自锁继电器，311系列顺序/步进继电器，349系列电压传感器和RSX系列定制包控制。
Struthers-Dunn致力于提供最高质量的产品和服务，满足或超越继电器和控制市场中的客户要求，并遵守所有适用的行业法规和要求。 通过管理强大的质量管理体系并不断改进内部流程，实现客户满意度。

Struthers-Dunn LLC, formally known as Struthers-Dunn or Dunco, is a manufacturer of industrial controls since 1923.

Struthers-Dunn was founded by John Struthers-Dunn in 1923 outside Philadelphia, Pennsylvania. They were one of the earliest relay manufacturers in the United States and became the first manufacturer of Military Relays for US Government during World War II. Their first military product, the 101 Series contactor was a 100A rated SPST switch for use on Naval Ships in 1938. Subsequent development led to the beginning of the QPL (Qualified Product List) of products for the US Military, commonly known as MIL-SPEC Products today.

On the Commercial Products side, their other notable design was the 219 Series of Industrial Relays. Originally designed as a socket-compatible, high-reliability relay for use in Nuclear Energy Facilities, it is still used today for critical controls. The 219 packaged family of products, and the 219NE (Nuclear Energy) family, encompassed in addition to the standard electro-mechanical versions - the 236/237/238 family of industrial time-delay relays, the later 246/247/248 family of advanced time-delay relays, the 255 Series of latching relays, the 311 Series of Sequence/stepper relays, the 349 Series Voltage Sensors and the RSX Series of custom packages controls.

Struthers-Dunn is committed to providing the highest quality products and services that meet or exceed Customer equirements in the Relays and Controls market, as well as complying with all applicable Industry Regulations and requirements. Customer satisfaction is achieved by managing a strong Quality Management System and continually improving our internal processes.