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Magnetic, Reed Switches

Image Part Number Description / PDF Quantity Rfq
RI-80SMD-1015-G1

RI-80SMD-1015-G1

Comus International

SWITCH REED SPST-NO 250MA 140V

1868
MK15-B-2-OE

MK15-B-2-OE

Standex Electronics

SWITCH REED SPST-NC 500MA 180V

0
MRPR-20-32-38

MRPR-20-32-38

Wickmann / Littelfuse

SWITCH REED SPST-NO 1.1A 265V

1086
MK17-C-2

MK17-C-2

Standex Electronics

SWITCH REED SPST-NO 500MA 170V

1554
MG-B2-10-L

MG-B2-10-L

Magnasphere Corp.

SWITCH MAGNETIC 250MA 30V

1311
MK06-8-H

MK06-8-H

Standex Electronics

SWITCH REED SPDT 500MA 175V

0
MK06-6-C

MK06-6-C

Standex Electronics

SWITCH REED SPST-NO 400MA 200V

824
MS-108-3-4

MS-108-3-4

PIC GmbH

REED SENSOR PITCH 20.32 MM

393
MDSM-4B-32-38

MDSM-4B-32-38

Wickmann / Littelfuse

SWITCH REED SPST-NO 350MA 140V

0
SW PR126/25-30 AT

SW PR126/25-30 AT

Standex Electronics

SWITCH REED SPST-NO 1.5A 300V

5493
FLEX-14-7-10

FLEX-14-7-10

Wickmann / Littelfuse

SWITCH REED SPST-NO 350MA 140V

0
MLRR-4-22-28

MLRR-4-22-28

Wickmann / Littelfuse

SWITCH REED SPST-NO 700MA 140V

9552000
MDSM-10B-10-15

MDSM-10B-10-15

Wickmann / Littelfuse

SWITCH REED SPST-NO 350MA 140V

0
PMC-1401T1015

PMC-1401T1015

PIC GmbH

STANDARD SMD REED SWITCH PITCH 1

58
MDSR-7-20-25

MDSR-7-20-25

Wickmann / Littelfuse

SWITCH REED SPST-NO 350MA 140V

848
PMC-1001S1015

PMC-1001S1015

PIC GmbH

STANDARD SMD REED SWITCH

0
MDCG-4-27-38

MDCG-4-27-38

Wickmann / Littelfuse

SWITCH REED SPST-NO 350MA 140V

0
MDRR-DT-10-15-U

MDRR-DT-10-15-U

Wickmann / Littelfuse

SWITCH REED SPDT 180MA 120V

0
MS-104-3-1

MS-104-3-1

PIC GmbH

MICRO REED SENSOR PITCH 10.16 MM

51
MS-110X

MS-110X

PIC GmbH

LATCHING REED SENSOR PITCH 25.4

279

Magnetic, Reed Switches

1. Overview

Magnetic reed switches are electromechanical switching devices operated by an applied magnetic field. Comprising ferromagnetic contacts sealed in a glass envelope, they enable contact closure (or opening) without physical actuation. Their hermetically sealed design ensures reliability in harsh environments, making them critical components in modern automation, security systems, and industrial equipment.

2. Main Types & Functional Classification

TypeFunctionApplication Example
Normally Open (NO)Contacts open without magnetic fieldDoor/window sensors in alarm systems
Normally Closed (NC)Contacts close without magnetic fieldEmergency shut-off systems
Change-over (CO)Three-contact configuration with common terminalIndustrial process control systems
High-Voltage Reed SwitchRated for >1kV applicationsMedical imaging equipment

3. Structure & Composition

Typical structure includes:

  • Hermetically sealed borosilicate glass capsule
  • Electroplated ferromagnetic nickel-iron contacts (0.1-0.2mm thickness)
  • Inert gas atmosphere (usually nitrogen or argon)
  • External magnetic actuation source (permanent magnet or electromagnet)

Advanced variants feature sputtered ruthenium/tungsten coatings for improved contact durability.

4. Key Technical Parameters

ParameterTypical RangeSignificance
Contact Rating10VA - 200VADetermines switching capacity
Operate Time0.2 - 2.0msResponse speed for fast-switching applications
Dielectric Strength100V - 10kVElectrical insulation capability
Operational Life106 - 109 operationsLong-term reliability indicator
Actuation Distance1 - 50mmDesign flexibility for mechanical systems

5. Application Fields

  • Consumer Electronics: Smart home sensors, wearable devices
  • Automotive: Transmission position sensors, anti-theft systems
  • Industrial: Flow meters, valve position monitoring
  • Medical: MRI machine interlocks, infusion pump controls
  • Security Systems: Window/door intrusion detection

6. Leading Manufacturers & Products

ManufacturerProduct SeriesKey Features
TE ConnectivityKB Series109 operations life, aerospace qualified
OmronReed Relays G6KSubminiature size (10.5mm), 24VDC rating
Honeywell919H SeriesHigh-voltage (3000VAC), medical-grade insulation
HamlinHermetic Reed SwitchesIP68 rating, -55 C to +125 C operating range

7. Selection Guidelines

Key considerations:

  • Contact configuration (NO/NC/CO) matching control circuit requirements
  • Environmental factors: Temperature (-40 C to +150 C typical), vibration resistance
  • Electrical parameters: Must exceed 20% of application requirements
  • Actuation method: Fixed magnet position vs. movable magnet systems
  • Mounting orientation: Axial vs. radial mounting constraints

Case Study: Smart meter applications require reed switches with >108 operations life and anti-tamper certification.

Industry Trends

Emerging developments include:

  • Micro-scale reed switches for IoT devices (under 3mm size)
  • Integrated Hall effect sensor combinations
  • Graphene-coated contacts for ultra-low resistance (0.01 typical)
  • Wireless reed switch modules with BLE connectivity
  • Increased adoption in renewable energy systems for contactor control
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