Reed Switch

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  1. Unidentified MFG - 159-157-RA1 - Relay, Reed. SPDT Mercury Hg-Wetted, Form C,
    Special Price $5.98 Regular Price $7.50 As low as $3.98

    159-157-RA1 Relay, Reed. Mercury Hg-Wetted, Form C.

    The mercury-wetted contact relay represents one of the more sophisticated types of relays made today. The early pioneer work in mercury-wetted contact switching dates back to the 1950’s, as telephone laboratory scientists sought out the “perfect contact”.

    Reed relays use an external electromagnet to control the reed switch. The contacts are of magnetic material and the electromagnet acts directly on them without requiring an armature to move them. Sealed in a glass tube, the contacts are protected from corrosion. Mercury-wetted relays are fast in operation and have relatively good load carrying capacity and long life. The mercury films are reestablished at each contact closure and contact erosion is eliminated. The mercury films are stretchable, there is no contact bounce and because it is a mercury contact, the contact resistance is very low and idea for low level switching applications.

    A mercury-wetted reed relay is a form of reed relay that employs a mercury switch, in which the contacts are wetted with mercury. Mercury reduces the contact resistance and mitigates the associated voltage drop. For high-speed applications, the mercury eliminates contact bounce, and provides virtually instantaneous circuit closure. Mercury wetted relays are position-sensitive and must be mounted according to the manufacturer's specifications. Because of the toxicity and expense of liquid mercury, these relays have increasingly fallen into disuse.

    The high speed of switching action of the mercury-wetted relay is a notable advantage. The mercury globules on each contact coalesce, and the current rise time through the contacts is generally considered to be a few picoseconds. However, in a practical circuit it may be limited by the inductance of the contacts and wiring. It was quite common, before restrictions on the use of mercury, to use a mercury-wetted relay in the laboratory as a convenient means of generating fast rise time pulses, however although the rise time may be picoseconds, the exact timing of the event is, like all other types of relay, subject to considerable jitter, possibly milliseconds, due to mechanical imperfections. The only major weakness of a mercury wetted contact relay is the necessity to mount the relay within 30° of a vertical position, due to its position sensitivity.

    Type: Form C

    Contacts: SPDT.

    Switched Load Rating: 2 Amp, 500 Volts Max, 100 VA Maximum

    Carry Load Rating: 5 Amp

    Contact Resistance: 14 Milliohms Typical, 20 Milliohms Max.

    Packaging: Under High Pressure in Glass Capsules.

    Approximate Dimensions 5.8mm D x 38mm Long. (0.225" X 1.5")

    Life Expectancy: 1 billion operations minimum at rated load.

    Note: Mercury Hg-Wetted.

    Danger - High Pressure Glass Capsule- Handle with Care - User assumes responsibility and competency to handle this item.

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  2. HAMLIN - MRR-2-185 - Normally Open, Magnetic Reed Switch
    Special Price $5.98 Regular Price $8.50 As low as $3.98

    HAMLIN - MRR-2-185 - Normally Open Magnetc Reed Switch

    SPST - NO

    Operating Temperature: -40°C ~ 125°C

    Current – Carry: 1.5A (DC)

    Voltage - Switching DC: 200 V

    Operate Time: 0.75 ms

    Release Time: 0.3 ms

    Capacitance: 0.2 pF

    Overall 2.25" Long

    Switch Body 3/4"

    10W 750mA (DC) Through Hole

    New Old Stock

    NSN 5930-01-249-7412

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  3. Unidentified MFG - 3-520 - Switch, reed. Normally open (NO).
    Special Price $1.98 Regular Price $3.00

    Switch, reed.

    Normally open (NO).

    Package: glass, axial leads.

    Dimensions: Overall 5.1mm round D x 36.2mm long.

    New Old Stock

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  4. Unidentified MFG - 3-069 - Keyboard Switch. Anti-Bounce with Cap. Package of 4.
    Special Price $2.49 Regular Price $3.50 As low as $1.98

    Keyboard Switch.

    Micro Reed & Magnet, Push Button Anti-Bounce Keyboard Switch.

    Normally Open.

    Snap-in Mounting.

    With straight slightly slanted X shaped top and partial cap with hole for LED but NO CLEAR COVERS FOR TOPS.

    Package of 4.

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  5. Unidentified MFG - 3-570 - Normally Closed REED Switch
    Special Price $0.98 Regular Price $1.50

    Normally Closed REED Switch

    Black Heat Sink Tubing Housing and White Wire Leads.

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  6. COTO - FR2335 - Switch, reed.
    Special Price $1.19 Regular Price $1.50 As low as $0.79

    COTO - FR2335 - Switch, Reed.

    SPST-NO, Closes in Proximity to Magnet.

    Glass Body 350mA, 140V


    Termination Style: Gull Wing

    Carry Current: 1A

    Overall Length Approximately 0.75-inch, 0.085" Diameter.

    Alternate: MDSM-10R-10-25 (Slightly Smaller)

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  7. Honeywell MICRO SWITCH - 20FR5-6B - N.C. Magnet Actuated Reed Proximity Switch
    Special Price $89.98 Regular Price $124.95

    MICRO SWITCH - 20FR5-6B - Factory New Magnet Actuated Reed Proximity Switch

    Normally Closed (NC) with No Nagnet Opens with magnet next to the Explosion Proof Housing

    Internal dry reed switch, hermetically sealed contacts
    Industrially packaged in aluminum housings
    Matching permanent magnet unit
    1/2 inch conduit outlet
    Meets portions of NEMA enclosure Type 1, general purpose; Type 2, driptight; Type 3, weather resistant; and, Type 12, industrial Use
    Slide-by, head-on or vane actuation
    Designed to be compatible with solid state logic level input requirements

    Voltage: 500VDC Max, 1.5Amp Max

    20 Watt Max.

    SPST Relay Contact

    Factory New Old Stock - In Manufacturer's Packaging with Instructions and Bracket.

    Made in USA

    Note: This product was oroginally branded labeled Honeywell, Microswitch, later Yamatake, Pepperl+Fuchs, Visolux, or Azbil.

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  8. Hasco - P1291-12 - Switch, reed. Normally open.
    Special Price $0.98 Regular Price $1.50 As low as $0.79

    Hasco - P1291-12 Switch, Reed.

    The reed switch is an electrical switch operated by an applied magnetic field. The contacts are normally open, closing when a magnetic field is present. A reed switch can be said to require zero power to operate it.

    Normally Open.

    Package: Glass Envelope.

    Dimensions: 0.7" (1.7mm) D x 0.377" (9.5mm) long.

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  9. TYCO/ALCOSWITCH - MSPM-101CDX - Switch, pushbutton. SPST NO magnetic reed.
    Switch, pushbutton. Contacts: SPST NO. Contact Ratings: 100VDC 100mA 10 watt (max) resistive only. Actuator: momentary. Connection: Two (2) turret post connections. Mech: Panel mount. Body: Approximately 0.530" D x 0.566" deep, behind panel. Hermetically sealed. Note: Small red actuator. No actual knob as seen in Alco MSPM-101CSDX. Magnetic reed switch. Learn More
  10. Hasco - D-1348-05 - Switch, reed. Glass envelope. N.O.
    Switch, reed. Normally open. Package: Glass envelope, 2.6mm D x 15.8mm long. Note: Hexagram D-1348-05. Hasco ALT P/N: 032-0003. Learn More
  11. HAMLIN - MDRR-4-1722 - Glass Reed Switch, SPST, NO
    Special Price $3.98 Regular Price $4.00 As low as $2.49

    HAMLIN - MDRR-4-1722 - Reed Switch Glass Capsule, Two Ferromagnetic Nickel-Iron Wires.

    The two wires are formed into "reeds" by flattening one end. The reed ends are carefully aligned with a small overlap and then permanently sealed inside the glass capsule. The overlap or contact area of the reeds is coated with special metals such as ruthenium. The nickel-iron leads are tin plated so that they can be soldered.


    • Hermetically sealed switch contacts are not affected by and have no effect on their external environment
    • Can be used as changeover or normally closed contact
    • Zero operating power required for contact closure
    • Excellent for switching micro-controller logic level loads

    A miniature changeover switch with a 14.73mm long x 2.54mm diameter (0.580" x 0.100") glass envelope. 

    The Reed Body Measures 0.580" Long. 0.100" Diameter Length with leads is Approximately 1.60" Long

    Note: Hamlin Products are now Littelfuse products.

    Note: Price is for 1 Glass Reed Switch


    • Position sensing
    • Industrial controls
    • Office equipment
    • Home appliances
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  12. MICRO SWITCH - 20FR1-6 SPNO, 400V, 1.0A, 15W.
    Special Price $169.98 Regular Price $250.00


    Magnetic Reed Sensor Magnetic Field Sensing

    N.C. 500V 1.5A 20W


    Hermetically Enclosed

    Wire Leads

    New Old Stock - With Box and Mounting Brackets  

    Proudly Made in USA

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  13. MICRO SWITCH - 20FR5-6 SPNC, 500V, 1.5A, 20W.
    Special Price $169.98 Regular Price $250.00


    Magnetic Reed Sensor Magnetic Field Sensing

    N.C. 500V 1.5A 20W


    Hermetically Enclosed

    Wire Leads

    New Old Stock - No Box or Mounting Brackets  

    Proudly Made in USA

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  14. Hasco - W0207 / W0407 - Switch, reed. Magnetic. New.
    Switch, reed. Magnetic. Head: 0.352' x 0.273" oval. Overall head length: 1.076" long. New. Complete with attached 17" - 3 conductor solid wire leads (Red/Black/White). Note: Marked W0207, and W0407. Learn More
  15. Meder Electronics - KSK-1A71/4-BV50822 - Switch, reed. 1Amp NO. New.

    Switch, reed. 1Amp NO. Case: glass envelope. Dimensions: 0.1" D x 0.625" long. New. More info:

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  16. MICRO SWITCH - 20FR1-6B - SPNO, 400V, 1.0A, 15W.
    Special Price $169.98 Regular Price $250.00


    Magnetic Reed Sensor Magnetic Field Sensing

    N.O.400V 1A 15W


    Hermetically Enclosed

    Wire Leads

    Proudly Made in USA

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  17. MEDER ELECTRONICS - KSK-1A71/7- BV143 - Switch, reed. NO Magnetic.
    Special Price $1.49 Regular Price $1.95 As low as $0.98

    MEDER ELECTRONICS - KSK-1A71/7- BV143 - Switch, Reed.

    Status: Discontinued

    Glass length of 16.5 mm and diameter of 2.8 mm
    Normally open 1 Form A contact
    Carry current up to 1 A
    300 VAC breakdown voltage

    NO Magnetic. Glass.

    Dimensions: 1.7mm D x 12.7mm long.

    Overall with full leads 1.809" (45.9mm) long.

    Alternate/Equivalent: ORD2210V-2025

    Note: In 2012, Meder underwent global expansion through its merger with market-listed Standex Electronics. Today, the two companies operate together as Standex-Meder Electronics, and the Meder group is established in Europe, the USA and Asia.


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