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Showing Results For: Reed Switches

Reed Switches

Reed switches, or magnetic reed switches, are versatile electromechanical electronic components designed to operate or actuate by applying a relatively low magnetic field. These switches comprise two or more ferromagnetic, nickel-iron alloy or other metallic, thin, and flexible reed contacts/blades enclosed in an inert-gas-filled sealed glass tube. These magnetically permeable contacts are hermetically sealed, kept apart by a small air gap, and activated by the presence/absence of a magnetic field. These specialised reed switches feature resistance against moisture, dust, and other environmental contaminants. Additionally, reed switches come in normally open or normally closed configurations and can be customised to custom sensitivity levels.

What are the Potential Benefits of Reed Switches?

Reed switches are simple yet versatile electronic components that offer several benefits in various applications. Here are some of the key advantages of using reed switches:

  • They are compact and consume less power.
  • Simple and sealed design.
  • Function as simple on/off switches and other sensing elements, including proximity and level sensors.
  • Suit hazardous environments and provide robust safety.
  • Reed switches have a fast response time with magnetic sensitivity.
  • They are highly durable with a long operational life.
  • Provide protection against environmental factors such as dust, moisture, and gases. 
  • Operate reliably over a broad range of temperatures.
  • Offer non-contact switching and are cost-effective.

Operating Principle of Reed Switches:

Upon applying a magnetic field near the reed switch, the integrated ferromagnetic material in the reed contacts becomes magnetised and attracts each other. This causes the switch’s closed state, a phenomenon when contacts come into contact and complete an electrical circuit. When the magnetic field is removed or reversed, the contacts spring back to their original position–breaking the circuit and returning to the open state.

Two Types of Reed Switches:

Reed switches mainly come in two types based on their construction and operation:

  • Form A/Normally Open – The Form A reed switch, also known as a normally open (NO) reed switch, is the most common switch type. In its normal state, the switch contacts are open where no current flows across the circuit. When a magnetic field is applied, the reeds are attracted and come into contact, closing the circuit and allowing current flow.
  • Form B/Normally Closed – The Form B reed switch, also known as a normally closed (NC) reed switch, operates opposite the Form A switch. In its normal state, the contacts are closed, flowing current across the circuit. When a magnetic field is applied, the reeds are attracted and separated, opening the circuit and interrupting the current flow.
  • Form C/Changeover Switches – There are also combination types combining the features of Form A and Form B switches, known as Form C switches or changeover switches. In their normal state, the contacts are closed (like Form B), but when a magnetic field is applied, they open (like Form A).

Typical Applications of Reed Switches:

Reed switches find applications in a wide range of industries, such as:

  • Door and Window Monitoring
  • Robotics
  • Consumer Electronics
  • Medical Equipment
  • Automotive
  • Security Systems
  • Proximity Sensing
  • Liquid Level Detection
  • Telecommunications
  • Industrial Control Systems.

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114754, WIKA
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14361511, WIKA
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New Items
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HSR-003DT-0515-SP-SL, HSI SENSING

HSR-003DT-0515-SP-SL, HSI SENSING

HSR Series Microminiature Reed Switches HSI Sensing HSR series microminiature reed switches feature contacts hermetically sealed in a protective atmosphere. Protected contacts offer reliable operation in wet, oily and dirty environments. Ideal for use in proximity switches, flow meters, counting devices, limit switches, reed relays and precision instrumentation. Actuate Time: 3 millisecond, or less Typical Life Expectancy: 50 million operations HSI Sensing Reed Relays
New items
RI-23B, Assemtech

RI-23B, Assemtech

Form A & C Reed Switches These dry-reed switches have been hermetically sealed in a gas-filled glass envelope. Actuation is done with an electro-magnet, a permanent magnet or a combination of both. If you prefer, they can be placed alongside a coil and actuated when a current is applied to the coil. They feature single pole, single throw, normally open contacts and have two magnetically actuated reeds. There is a wide selection to choose from. You can select different lengths and each length has various sensitivity options. Hermetically sealed Form A (SPNO) or form C (SPCO) ruthenium or rhodium plated contacts Mechanical Life 10 8 Operations For suitable magnets, see stk. no 362-2401 typically Approvals UL, CSA
New items
RI-46B, Assemtech

RI-46B, Assemtech

Form A & C Reed Switches These dry-reed switches have been hermetically sealed in a gas-filled glass envelope. Actuation is done with an electro-magnet, a permanent magnet or a combination of both. If you prefer, they can be placed alongside a coil and actuated when a current is applied to the coil. They feature single pole, single throw, normally open contacts and have two magnetically actuated reeds. There is a wide selection to choose from. You can select different lengths and each length has various sensitivity options. Hermetically sealed Form A (SPNO) or form C (SPCO) ruthenium or rhodium plated contacts Mechanical Life 10 8 Operations For suitable magnets, see stk. no 362-2401 typically Approvals UL, CSA
New items
GC2722 (40-50AT), Assemtech

GC2722 (40-50AT), Assemtech

Form A & C Reed Switches These dry-reed switches have been hermetically sealed in a gas-filled glass envelope. Actuation is done with an electro-magnet, a permanent magnet or a combination of both. If you prefer, they can be placed alongside a coil and actuated when a current is applied to the coil. They feature single pole, single throw, normally open contacts and have two magnetically actuated reeds. There is a wide selection to choose from. You can select different lengths and each length has various sensitivity options. Hermetically sealed Form A (SPNO) or form C (SPCO) ruthenium or rhodium plated contacts Mechanical Life 10 8 Operations For suitable magnets, see stk. no 362-2401 typically Approvals UL, CSA
New items
RI-23, Assemtech

RI-23, Assemtech

Reed capsules - switches From Coto, this RI-23 Series micro dry-reed switch contains two magnetically actuated reeds. Hermetically sealed in a glass envelope, the RI-23 Series reed switch boasts an excellent life expectancy and is suitable for general purposes. Available in standard (RI-23B) and miniature (RI-27A) versions. Applications: • Telephone • Alarm systems • Test and Measurements • Automobile
New items
RI-90 Kit, Assemtech

RI-90 Kit, Assemtech

Form A & C Reed Switch Kits These kits have been specially brought together for the design stage. Each kit has a selection of sensitivity levels from the required series allowing you to test which is best for your application. This eliminates the need to purchase packs of each sensitivity helping to reduce waste and cost. They are hermetically sealed in a gas-filled glass envelope. Actuation is done with an electro-magnet, a permanent magnet or a combination of both. If you prefer, they can be placed alongside a coil and actuated when a current is applied to the coil. They feature single pole, single throw, normally open contacts and have two magnetically actuated reeds. Features Hermetically sealed Form A (SPNO) or form C (SPCO) ruthenium or rhodium plated contacts Mechanical Life 10⁸ Operations For suitable magnets, see stk. no 362-2401 typically
New items
2202-1917-060, Assemtech

2202-1917-060, Assemtech

Form A & C Reed Switches These dry-reed switches have been hermetically sealed in a gas-filled glass envelope. Actuation is done with an electro-magnet, a permanent magnet or a combination of both. If you prefer, they can be placed alongside a coil and actuated when a current is applied to the coil. They feature single pole, single throw, normally open contacts and have two magnetically actuated reeds. There is a wide selection to choose from. You can select different lengths and each length has various sensitivity options. Hermetically sealed Form A (SPNO) or form C (SPCO) ruthenium or rhodium plated contacts Mechanical Life 10 8 Operations For suitable magnets, see stk. no 362-2401 typically Approvals UL, CSA Approvals UL; CSA
New items
MDCG-4-17-23, Littelfuse

MDCG-4-17-23, Littelfuse

MDCG-4 Sub-miniature Axial Lead Reed Switch, Low Power These subminiature, axial lead reed switches can switch 200 V dc at 10 W. These switches have a low electrical footprint and require zero operating power to close the contacts. These units are hermetically sealed and with magnetically operated contacts they are highly resilient to contamination. Even operating in conditions long after optical and other technology reed switches would have failed. The glass envelope measures 15.24 x 2.28 mm and house normally open contacts. Item 905-8887 has an AT 12-18 sensitivity rating. Item 905-8881 has an AT 17-23 sensitivity rating. Potential Applications Reed Relays Security Limit Switching Level Sensing Office Equipment Industrial Control Features Subminiature normally open switch Capable of switching 200 V dc or 0.5 A at up to 10 W Operating temperature range: -40°C to +125°C
New items
HA15-2-17-23, Littelfuse

HA15-2-17-23, Littelfuse

HA15-2 High-Voltage Reed Switches, Low Power These subminiature, axial lead reed switches an of switch 265 V ac at 10 VA. They are hermetically sealed and with magnetically operated contacts they are highly resilient to contamination. They are not effected by and do not affect their external environment. They also do not require any operating power for contact closure. The glass envelope on these reed switches measures 15.24 x 2.28 mm and it houses normally open contacts. It has a high insulation resistance and low contact resistance and they are also ATEX approved between 17-33 AT range. Potential Applications Reed relays Security Limit switching Office equipment Light inductive loads European mains voltage Features Subminiature, normally open switch Longer leads are flexible for easy forming Capable of switching 100 to 265 V ac or 0.3A up to 20 VA (10 W for V dc) Operating temperature range: -20°C to +125°C
New items
MRA200/20-40, Sensata / Cynergy3

MRA200/20-40, Sensata / Cynergy3

Form A & C Reed Switches Suitable for use with location sensors, proximity switches and level switches at low to medium voltages and current Electrical Life 10 5 - 10 6 Switching Cycles Mechanical Life 10 9 Operations For suitable magnets, see stk. no 118-7108 typically
New items
DRA283/60-80, Sensata/Cynergy 3

DRA283/60-80, Sensata/Cynergy 3

Form A & C Reed Switches Suitable for use with location sensors, proximity switches and level switches at low to medium voltages and current Electrical Life 10 5 - 10 6 Switching Cycles Mechanical Life 10 9 Operations For suitable magnets, see stk. no 118-7108 typically
New items
HSR-023RT-0515-SP-SL, HSI SENSING

HSR-023RT-0515-SP-SL, HSI SENSING

HSR Series Microminiature Reed Switches HSI Sensing HSR series microminiature reed switches feature contacts hermetically sealed in a protective atmosphere. Protected contacts offer reliable operation in wet, oily and dirty environments. Ideal for use in proximity switches, flow meters, counting devices, limit switches, reed relays and precision instrumentation. Actuate Time: 3 millisecond, or less Typical Life Expectancy: 50 million operations HSI Sensing Reed Relays
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We offer free shipping for orders over £200 if delivery is in the UK. All other orders in the UK, shipping from £7.99 depending on the weight and measurement. Mainland Europe shipping charges start from £25. For all other countries shipping charges start from £50 for products like Reed Switches and all others.
You can email us directly at sales@enrgtech.co.uk or via our website for any queries regarding Reed Switches or any other product.
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