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 We offer a range of magnets in different sizes and shapes, specially selected to...Continue reading ->

Actuation Distances for UM-0018-H Reed Switches

UM-0018-H actuation distances On/Off distances for the 7.0 mm UM-0018-H reed switch having cropped, SMD, Horizontal Mount...Continue reading ->


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...Continue reading ->

Product Handling

Dropping Reed switch Reed Switches, Reed Sensor and Magnet Sensors are sensitive devices that easily develop micro...Continue reading ->

Manual Soldering

Soldered Reed switch Manual Soldering of reed switch leads may be required when using custom plastic housing...Continue reading ->

Ferro-magnetic parts

Ferromagnetic parts Using Ferro-magnetic mounting parts or screws within a 100 mm vicinity of a reed switch will...Continue reading ->

Potting and Encapsulation

Dispensing unit As some potting compounds cure over 24 hours, the glass seals should be protected....Continue reading ->

Reed Contact Protection Circuits

Inductive Load Protection Circuit When a reed switch is to be connected to an inductive load or a...Continue reading ->


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

key ignition As long as the ignition key detecting reed sensor is not actuated means that...Continue reading ->

Reed switches in Lightsabers

Reed Switches are used in Lightsabers to for power up only when the owner...Continue reading ->

Magnet sensors in Musical Greeting Cards

Reed switches in musical greeting card Ultra miniature reed switches can be used in electronic greeting cards with magnets to...Continue reading ->

Reed sensors in Radio-controlled Gliders and model Airplanes

Reed switches in model airplanes Reed Sensors are very light devices and can be used in model airplanes, helicopters...Continue reading ->

Reed sensors in Accurate level sensing of fluids

Reed switches in fluid level sensing Special reed sensors with an integrated resistor can be mounted on PCBs to give...Continue reading ->

Reed switches in Washing machine vibration detection

Reed switches in washing machine Reed Switches are used for building bi-directional vibration sensors. These sensors can detect if...Continue reading ->

Reed sensors in Electric Toothbrushes

Reed switches in electric toothbrush Electric toothbrushes use Reed Sensors to sense change in direction when switching from the...Continue reading ->

Reed switches and Reed sensors in Spirometers

Spirometer Reed Switches help measure the volume of air intake and the time in a...Continue reading ->

Miniature Reed sensors in activating Dentist’s Drill

Dentist Drill A reed sensor finds the perfect application in such a drill, to work as...Continue reading ->
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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