Schneider Electric MS03S0300 Roller Plunger Limit Switch

Schneider Electric's 9007MS03S0300 (commonly listed as Square D MS03S0300) is a miniature, potted roller plunger limit switch designed for rugged industrial control. It uses a spring-return cross roller plunger actuator to actuate the 1NO/1NC (SPDT) contacts, rated for 240 VAC up to 10 A and 28 VDC up to 5 A, enabling reliable switching in mixed circuits. The device features a cast zinc housing with epoxy powder coating and is built for harsh environments, offering IP67 ingress protection and NEMA 1/2/4/6/6P enclosure compatibility. Its compact dimensions are 1.75 in high, 1.56 in wide, and 0.62 in deep, with an actuator length of 0.88 in, making it suitable for tight installations. Bottom pre-wired cable connections are available on selected variants, and the switch is rated for a wide operating temperature range from -40 °F to 220 °F (-40 °C to 105 °C). Common applications include limit sensing on conveyors and machinery, automation equipment safety interlocks, and other control circuits that demand precise actuation and rugged sealing. The unit carries UL Listing and CSA certification and is CE-marked in many catalogs, underscoring compliance with major global safety standards.