----MAKE SELECTION---- Features, Construction, Magnet Actuation Patterns Contact Form, Contact Material Visual Selection Guide Application Notes ----DRY REED SWITCHES---- HYR 1532 - General Application HYR 2001 - General Application HYR 2034 - General Application HYR 4001 - General Application HYR 5051 - General Application HYR 1002 - Ultraminiature HYR 1003 - Ultraminiature HYR 1531 - High Power HYR 2003-1 - High Power HYR 2003-2 - High Power HYR 2016 - High Power HYR 1559 - High Voltage Breakdown HYR 2016 - High Voltage Breakdown HYR 5006 - High Voltage Breakdown HYR 5007 - High Voltage Breakdown HYR 5008 - High Voltage Breakdown HYR 2011 - Low Thermal EMF & RF HYR 1506 - High Inrush Current HYR 2031-1 - Close Differential HYR 1554 - Form C Switch HYR 1555 - Form C Switch HYR 4003 - Form C Switch ----MERCURY WETTED REED SWITCHES---- HYR 9001 HYR 9001-1 HYR 9004-9 HYR 9004-1 HYR 9005-1 HYR 9005-9

Reed Switch

Features Compact and Light The reed switch can be mounted in a very limited space; it is ideal for use in miniatured equipment.   Hermetically Sealed The switching elements of the reed switch are hermetically sealed in an inert gas atmosphere, so that they are never exposed to the external environment.   Long Life The reed switch employs no sliding parts, so there is no fatigue related to degradation in the quality of the materials used, ensuring a virtually unlimited mechanical life.   High Speed Operation Every movable element has a very low mass resulting in a high speed of operation. This enables the reed switch to be used as an interface to a transistor or integrated circuit. Construction The reed switch consists of a pair of flexible reeds made of a magnetic material, and sealed in a glass tube filled with inert gas. The reeds are overlapped but separated by a small gap. The contact area of each reed is plated with a noble metal, such as Rhodium or Ruthenium, to provide the switch with stable characteristics and long life. Application of a magnetic field, generated by a permanent magnet or a coil, to the reed switch causes both reeds to be magnetized. This produces an N-pole at the contact area of one reed, and an S-pole at that of the other reed, in a manner shown on the drawing (left). If the magnetic attracting force overcomes the resistive force caused by elasticity of the reed, the reeds come in contact (Pull-In) i.e., the circuit is closed. Once the magnetic field is removed, the reeds are separated again by the effect of elasticity of the reed (Drop-Out) i.e., the circuit is opened. Magnet Actuation Patterns The most often used way of the actuating a reed switch is with a magnet; the typical patterns of actuation are as shown on the drawings below.   Horizontal Actuation Transverse Actuation Perpendicular Actuation Rotational Activation

Contents - Reed Switches   Features - Construction - Magnet Actuation Patterns   Contact Form - Contact Material   Visual Selection Guide   Dry Reed Switches - HYR1002, HYR1003, HYR1531, HYR1532   Dry Reed Switches - HYR1554, HYR1555, HYR1506, HYR1559   Dry Reed Switches - HYR2001, HYR2031, HYR2031-I, HYR2003-1       Dry Reed Switches - HYR2003-2, HYR2034, HYR2011, HYR2016   Dry Reed Switches - HYR4001, HYR4003, HYR5051, HYR5006   Dry Reed Switches - HYR5007, HYR5008   Mercury Wetted Reed Switches   Application Notes

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