About Us

From a modest beginning as a one-product company in 1919, LEACH® products have become the standard for the design and manufacture of electrical switches, aircraft relays, electrical relays and control devices for the aerospace and rail industries. Designed for applications as diverse as civil and military aviation, satellites and railway systems, the extensive LEACH® line of products includes a full selection of hermetically sealed relays. LEACH® contactors are available with single or multi-pole contacts in latching or non-latching configurations. A variety of complementary devices provide time delay and power measurement functions. The majority of these products are available in different mounting styles and terminals. Comprehensive lines of push-button indicators, solid state power controllers, limit switches and equipment (power distribution assemblies) also play important roles in the company’s product mix.


Today’s broad range of products can trace its heritage back to 1919 with the development of a single product in a small laboratory in San Francisco. As a radio operator in the U.S. Navy during World War I, Val Leach conceived the idea for a break-in relay to eliminate many of the frustrations he experienced with the erratic nature of early two-way radio communications. His automatic antenna switch and power relay became the company’s first product. Operations were moved to Los Angeles, CA in 1929, and, during the next ten years, the product family was broadened to include other types of relays including time delay relays, aircraft switches, power monitor, power distribution, and aircraft relays for the communications and electrical industries. It was not long before Leach relays became known to aircraft manufacturers and products were developed specifically for aircraft power switching as well as for aircraft communications.