Reed Relay

Reed Relay, also known as magnetic reed relay, is a miniature, hermetically sealed, high-speed electromechanical switch that uses a reed switch as its core switching component and is driven by an electromagnetic coil. It is widely used in precision signal switching and isolation control.

  • Description
  • Specifications
  • Size

Core Features and Advantages

  • Extremely simple structure and ultra-small size: Suitable for high-density PCB mounting.
  • Extremely low operating power and high sensitivity: Low driving energy consumption.
  • Ultra-fast response speed: Operating/release time of 0.1–2 ms.
  • Ultra-long service life: Hermetically sealed with no wear, electrical life can reach 10⁷ to 10⁸ operations.
  • Excellent isolation performance and extremely low leakage current: High withstand voltage between contacts and coil, leakage current < pA level.
  • Strong vibration resistance and anti-interference capability: Suitable for harsh environments.
  • Various contact forms: Single Pole Single Throw (SPST), Single Pole Double Throw (SPDT), etc.

 

Working Principle

  • Coil de-energized: With no magnetic field, the reed remains open by its own elasticity (normally open type).
  • Coil energized: A magnetic field magnetizes the reed, forming opposite magnetic poles at the contact ends that attract each other to close, conducting the circuit.
  • Coil de-energized: The magnetic field disappears, and the reed returns to the open state by elasticity.

Coil Parameters: Rated voltage (5V/12V/24V), coil resistance, operate/release power.

Contact Parameters:

  • Type: Normally Open (NO), Normally Closed (NC), Changeover.
  • Load: Low-signal type (switching mA~1A/30V), power type (up to 2A/220V).

Electrical Performance: Insulation withstand voltage, contact resistance, operating time, service life.

Package Type: Through-hole (DIP), Surface Mount (SMD), leaded type.