Reed Relays and
Electronics India Limited
Manufacturer of Reed Switches, Reed Sensors and Reed-based products
Reed Relays and Electronics India Limited Incorporated in 1971

UM-0018-H Ultra Miniature Reed Switch

These highly sensitive, Ultra Miniature Form A reed switches are designed for low power, high speed switching applications and have an Operate Time of less than 0.3 milliseconds. The 7.0 mm glass version is built for lower Contact Resistance and can switch higher loads of 10W at 100V. The flattened leads are useful for orienting all reed switches in a batch, in one way, while soldering, welding etc., for maximum in-group sensitivity. The cropped version of this UM-0018-H reed switch is suitable for smaller plastic housings and can be soldered to cables, the SMD version is suitable for reflow on PCBs, and the vertical and horizontal mount versions are suitable for mounting on through hole PCBs.

  • Drawing of UM-0018-H Ultra Miniature Reed Switch with Full Length Leads
  • Drawing of UM-0018-H Reed Switch with Cropped Leads
  • Drawing of UM-0018-H with Formed Leads for Horizontal Mounting
  • Drawing of UM-0018-H with Formed Leads for Vertical Mounting
  • Drawing of UM-0018-H Reed Switch for Vertical mounting


7.0 mm Glass length. Ruthenium contact. Normally Open. Inert gas filled. 4 types of Lead Formations.



Omni-polar. Does not require power for operation. Sputtered Contact. RoHS Compliant. Not ESD Sensitive.

Cylindrical and Rectangular Magnets

Standard magnets-RRE Drawing of Cylindrical MagnetsDrawing of Rectangular Bar Magnets starFeaturesNdFeB High Energy. Nickel coated. Energized Continue reading ->

Nov 18, 2020

Actuation Distances for UM-0018-H Reed Switches

UM-0018-H actuation distances For easy selection of AT band and Magnet for an application, we offer Actuation distances for the UM-0018-H Reed Switch in cropped, SMD Continue reading ->

Nov 25, 2020


Contact FormA
Contact Rating (max)W/VA10.0
Switching Current (max)A0.5
Carry Current (max)A0.5
DC Switching Voltage (max)VDC100
AC Switching Voltage (max)VAC70
Breakdown Voltage (min)VDC150
Contact Resistance (max)200
Insulation Resistance (min)Ω109
Capacitance (typ)pF0.2


Operate Time (max)ms0.35
Bounce Time (max)ms0.3
Release Time (max)ms0.1
Resonance Frequency (typ)Hz<2000
Operating Frequency (max)Hz500
Operating Temperature°C-40 to +120
Shock Resistance (½Sin wave for 11ms)G30
Vibration Resistance (10-2000Hz)G20
Test Coil Number717 102 003

Ordering Code

UM-0018-H-(Operate Band)-(Formation Code)

Operate BandAT7-20
Corresponding Release BandAT3-18
Formation CodeLead Type
Full Length Leads
HHorizontal Mount
VVertical Mount

Examples: UM-0018-H-7-12 denotes 7-12 Operate Band (AT) with Full Length leads. UM-0018-H-15-18-H denotes 15-18 Operate Band (AT) with Goal-post SMD formed leads for horizontal mounting.

Other Special Configurations: Lower Static Contact Resistance, Dynamic Contact Resistance Limit, Higher Insulation Resistance, Special Release Limits, Gold plated leads.

Usage Notes

Here are some of the recommended usage notes to ensure maximum durability of this reed switch. The complete usage notes are available here.

Ampere Turn Selection

Reed Sensor Manufacturer Cross Reference For any application, it is important to select the correct Ampere Turn (AT) or magnetic sensitivity of a Reed Switch, Reed Sensor or Continue reading ->

Aug 27, 2020

Product Handling

Dropping Reed switch Reed Switch Handling Reed Switches, Reed Sensor and Magnet Sensors are sensitive devices that easily develop micro cracks in the glass Continue reading ->

Aug 31, 2020

Manual Soldering

Soldered Reed switch Soldering of Reed Switches and Reed Sensors requires some care to ensure that these delicate devices are not inadvertently damaged. Damage Continue reading ->

Nov 10, 2020

Ferro-magnetic parts

Ferromagnetic parts Reed Switches use an alloy of Nickel and Iron with a few other elements that make the alloy Ferro-magnetic and having a low Remanence. Continue reading ->

Sep 4, 2019

Potting and Encapsulation

Dispensing unit Epoxy dispensing Nozzle When potting or encapsulating reed switch assemblies in custom housings, selection of materials are important. Continue reading ->

Sep 4, 2019

Reed Contact Protection Circuits

Inductive Load Protection Circuit It is assumed that the ideal reed switch load is a Resistive Load, but it is almost impossible to reduce any load to purely resistive. Continue reading ->

Aug 31, 2020


Although we can never restrict the use of a reed switch to a particular field, the following is a list of some of the applications that the UM-0018-H Miniature Reed Switch is known to perform well.

Reed sensors for detecting Ignition Key

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Nov 7, 2020

Reed switches in Lightsabers

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Nov 7, 2020

Magnet sensors in Musical Greeting Cards

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Nov 7, 2020

Reed sensors in Radio-controlled Gliders and model Airplanes

Reed switches in model airplanes Model Airplane Radio controlled aircrafts, gliders and helicopters come in various sizes from simple ones with few controls to more Continue reading ->

Nov 7, 2020

Reed sensors in Accurate level sensing of fluids

Reed switches in fluid level sensing Fuel Gauge In ships and yachts, it is not only necessary to monitor the exact volume of fuel, but also the volume of the sewage and the Continue reading ->

Nov 7, 2020

Reed switches in Washing machine vibration detection

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Nov 6, 2020

Reed sensors in Electric Toothbrushes

Reed switches in electric toothbrush Electric Toothbrush Electric toothbrushes are designed to make the brush head and bristles move in rapid motions, either in a Continue reading ->

Nov 6, 2020

Reed switches and Reed sensors in Spirometers

Spirometer Spirometer for Lung Function Testing A Lung function test or Pulmonary Function test, PFT for short, is a system to evaluate the Continue reading ->

Nov 6, 2020

Miniature Reed sensors in activating Dentist’s Drill

Dentist Drill Denstist's Drill A dental drill or hand-piece is a hand-held, mechanical instrument used to perform a variety of common dental Continue reading ->

Nov 6, 2020

UM-0018-H 10W Ultra Miniature Reed Switches
7.0mm x ø1.80mm, complete data sheet and technical specifications. This Reed Switch supersedes TRA 2212 and TRA 2213 and can be considered a direct equivalent. Customers can safely use UM-0018-H in place of MITI-3V1, ORD 213, KSK-1A80, RI 70, RD-18B, HSR-023R or MKA-07101.
Brand: RRE
Manufacturer: Reed Relays and Electronics
Model: UM-0018-H
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