Littelfuse SPST PCB Surface Mount Reed Switch 0.5 A 200 V MDSR-4-22-38

Littelfuse MDSR-4-22-38 SPST PCB Surface Mount Reed Switch is engineered for precision switching applications requiring up to 200 V and 0.5 A current capacity. This device offers robust performance by utilizing a hermetically sealed glass envelope with magnetically operated contacts, which reduces contamination risks and enhances long-term reliability in demanding environments.

The reed switch features a single pole single throw (SPST) contact configuration with nickel iron alloy contact material, providing a stable and low resistance contact of approximately 100 mΩ. It switches with a maximum power rating of 10 W, making it suitable for low power signal switching tasks often encountered in industrial automation and control systems.

Designed for surface mounting on printed circuit boards (PCB), the compact dimensions of 10.16 mm length and 1.8 mm width enable integration into space-constrained applications. The operating temperature range spans from -40°C to +125°C, which supports reliability in harsh industrial or laboratory conditions. The switch also exhibits fast operating characteristics, including a maximum release time of 0.2 ms and overall operating time including contact bounce of 0.6 ms.

The device’s sensitivity falls within an AT value of 22 to 38, offering precise detection in magnetic control scenarios. The wire terminal type and normally open Form A contacts simplify connection and ensure safe operation in circuits requiring a reliable on/off switch.

UR approved for safety compliance, the MDSR-4-22-38 switch is ideal for integration in diverse applications such as industrial machinery controls, HVAC equipment, medical instrumentation, and electronic safety interlocks. It offers long service life even under conditions that cause failures in other switch technologies such as optical or mechanical switches.

This product is new and manufactured to high reliability standards. Its surface mount form factor suits modern automated assembly processes. Magnetically operated contacts ensure zero operating power to close the switch.

Durable hermetic sealing protects against environmental contamination. Typical uses include automation systems, safety devices, and measurement instruments. Lightweight and compact construction facilitates PCB space savings.

Discover more high-quality Reed Switches and related components in the Electronics & Electricals category at EnvMart, designed for precision, reliability, and optimized industrial performance.