An Essential Design Decision: Reed Switches Benefits

If there are particular areas you need help with, feel free to skip to any of the following sections:

• Introduction
• Key Electrical Parameters
• Benefits of Reed Switches
• Applications and Markets
• Reliable Source
• Summary

Introduction

Reed switches are electromechanical devices actuated by a magnetic field. Two ferromagnetic blades sealed in glass either close (NO) or open (NC) when a magnet approaches, providing galvanic isolation and hermetic protection against corrosion and arcing. They’re ideal for harsh, dusty, or wet environments across a wide temperature range.

Key Electrical Parameters

• Pull-In (PO): Field/current/voltage (or AT) where contacts close; typically specified as a maximum.
• Drop-Out (DO): Point where contacts open (release/reset).
• Hysteresis: Often expressed as DO/PI (%); useful to avoid chatter.
• Contact resistance: Typically, contact resistance for a reed switch is ~ 70 mW, (10 to 25 mW of which is the actual resistance across the contacts).
• Dynamic contact resistance: Measured during operation to assess true contact condition.

For a more in-depth explanation of these and other key parameters jump to the blog: Basic Electrical Parameters of Reed Switch Products.

Benefits of Reed Switches

Applications and Markets

Reliable Source

Standex Electronics Detect is the premier worldwide source for reed switch technology, offering one of the industry’s broadest portfolios of reed switches, sensors, and relays. With decades of engineering expertise and high‑volume global manufacturing, Standex delivers reliable, cost‑effective, and application‑ready solutions for projects of any size. From standard products to custom sensitivity ranges and packaging, Standex provides the performance, consistency, and partnership customers need to solve their toughest design challenges.

• Broad portfolio: magnetic reed switches, reed relays, and packaged reed sensors.
• Custom sensitivity bands and packaging to fit your mechanical and electrical constraints.
• High‑volume manufacturing and quality systems for consistent PI/DO and contact performance.

Summary

Hermetically sealed reed technology combines precision, reliability, and long life with minimal power. Whether you need a tiny switch, a packaged sensor, or a relay for ATE, partnering with an expert supplier speeds design‑in and ensures performance in the field.