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

SM-1322 Sub Miniature Reed Switch

SM-1322 Sub Miniature Reed Switch Drawing

All dimensions in mm

SM-1322 Cropped reed switch SM-1322 SMD reed switch SM-1322 Vertical Mount reed switch SM-1322 Horizontal Mount reed switch

Click thumbnails to view actuation distances


Release AT configurable Robust 13.5 mm glass size Omni-polar 10W Contact rating Does not require power for operation Normally Open, Form A contact  Sputtered Ruthenium contact Inert gas filled glass capsule Four formations Tin plated leads  RoHS Compliant and Lead-free  Not Sensitive to ESD


This Form A reed switch is built with a 2.25 mm diameter glass with a higher wall thickness for better glass to metal seals, and is a good solution for general purpose, high volume applications with a little shock and vibration, such as toys. The centre contact also makes it suitable for coil applications. The three Release AT ranges available cover a wide range of Release AT specific applications. A specially Sputtered contact for 230 VAC line voltage switching is also available. This reed switch is completely Lead-free and conforms to the RoHS directive. The cropped version 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. Information on tolerances for these formations can be found here.


Differential Code L M H
Operate Range AT 10 – 40 10 – 40 10 – 40
Release Range AT 4 – 20 6 – 25 7.5 – 30
Contact Rating (max) W/VA 10.0 10.0 10.0
Switching Current (max) A 0.5 0.5 0.5
Carry Current (max) A 1.5 1.5 1.5
DC Switching Voltage (max) VDC 180 180 180
AC Switching Voltage (max) VAC 130 130 130
Breakdown Voltage (min) VDC 200 200 200
Contact Resistance (max) 100 120 150
Insulation Resistance (min) Ω 1011 1011 1011
Capacitance (min) pF 0.2 0.2 0.2


Operate Time (max) ms 0.5
Bounce Time (max) ms 0.15
Release Time (max) ms 0.15
Resonance Frequency Hz >2000
Operating Frequency Hz 500
Operating Temperature °C -40 to +200
Shock Resistance (½Sin wave for 11ms) G 50
Vibration Resistance (10-2000Hz) G 20
Test Coil Code 717 102 002

Ordering Code

SM-1322-(Release AT Code)-(Operate AT Band)-(Lead Formation Code)

Release AT Code L M H
Low Medium High
Formation Code C S V H
Cropped SMD Vertical Mount Horizontal Mount

Ordering Code Examples

SM-1322-L-10-15 denotes standard low Release in 10-15 Operate AT with unmodified leads
SM-1322-H-10-15-S denotes high Release AT in 10-15 Operate AT band with SMD formed leads

Handling of Reed Switches

Dropping Reed switch Reed Switches are sensitive devices that easily develop micro cracks in the glass to metal seals when subjected to external...Continue reading ->


Reed Switch cropping Reed switch leads may need to be cropped for use in custom plastic housings, after soldering with external cables. Cropping...Continue reading ->

Soldering Guide

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

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...Continue reading ->

Potting and Encapsulation

Dispensing unit When potting or encapsulating reed switch assemblies in custom housings, selection of materials are important. The specification of epoxy or...Continue reading ->

Other Special Configurations Available

Lower Static Contact Resistance
Dynamic Contact Resistance Limit
Higher Insulation Resistance
Special Release Limits
Gold plated leads


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 SM-1322 reed switch is known to perform well.

Reed switches in Barcode Scanners

Barcode Scanner Barcode scanners in supermarkets can be clicked on to a docking system that is integrated with the check-out conveyor belt...Continue reading ->

Reed Sensors for Early Brake Sensing

Brake pedal Automobile Brake Pedal The Brake pedal of an automobile is a very important aspect of the vehicle which is used...Continue reading ->

Reed Sensors in Automobile Power windows

Car power window Automobile Power Window These days, most automobile windows can be raised or lowered using buttons near the seats or on...Continue reading ->

Reed switches in Petrol and Diesel Pumps

Reed switches in petrol and disel pumps Fuel Nozzle Petrol and diesel pumping stations are explosive environments where a minor mistake could cause a great big fire....Continue reading ->

Reed switches in Gear speed and direction sensing

Reed switches in gear speed and direction sensing Gears Mechanical machinery always have a set of manual controls that not only direct the machinery between a forward and...Continue reading ->

Reed switches in Ferrous part detection

Reed switches in pick and place unit Pick and Place Robot For a cost effective solution to be used in heave machine automation where magnets cannot be...Continue reading ->

Reed switches in Electronics and Science Kits

Reed switches in science kits Science Kit Reed Switches are used in many electronics and science kits for experimenting on various circuits and scientific phenomena....Continue reading ->

Reed switches and Float switches in Water tank control

Reed switches in water tank control Water tank control Water is a scarcity in most of the major cities of the world, and in residences and...Continue reading ->

Reed switches in Blowers

Reed switches in blowers Blower Blowers or centrifugal fans are used in various fields to move air or other gases from one area to...Continue reading ->

Reed sensors in Power switches for explosive areas

Reed switches in explosive area Explosive Areas Explosion proof enclosures come in different grades and house components like switches, plug, controls, knobs, and other sensors,...Continue reading ->

Proximity Sensors for Door and window Security

Reed switches in window security Door/Window Security Home and Workspace security is paramount and most newly constructed spaces integrate security products during construction. Security consists...Continue reading ->

Reed sensors in Wind Vanes

Reed switches in wind vanes Wind Vane A weather vane is an instrument used to show the direction of the wind. A regular weather vane...Continue reading ->

Reed switches and Reed sensors in Pressure Gauges

Reed switches in bourdon tube pressure gauge Pressure Gauge A pressure gauge is an instrument used to display the pressure of a fluid. The most widely used...Continue reading ->

Proximity Sensors in Anemometers

Reed switches in anemometer Anemometer An Anemometer is an instrument used to measure wind speed. Spinning cup anemometers are measure wind speeds and are part...Continue reading ->

Flow Meters for checking Lake currents

Reed switches in flow_meter Lake Current Meter Underwater currents in lakes and other water bodies are caused by various factors such as pressure gradients...Continue reading ->

Magnet sensors in Anti-lock braking system (ABS)

Reed switches in ABS control system Anti-lock Braking Anti-lock braking system or ABS for short, is a safety system used on aircraft and on vehicles, such...Continue reading ->

Reed switches in Coolant flow sensing

Reed switches in coolant flow sensing Radiator Coolant A coolant is a fluid, that is used to reduce or regulate the temperature of a system, like...Continue reading ->

Magnet sensors in Low fluid level monitoring

Reed switches in low fluid level monitoring Fluid Low Level Automobiles these days need to provide a wide range of information on the various liquid levels ranging...Continue reading ->

Magnet sensors in Dish washer spray arm jam detection

Reed switches in dish washer spray arm jam detection Dishwasher Dishwashers are appliances used to automatically wash dishes and cutlery, by spraying high pressure hot water and detergent. This...Continue reading ->

Level Sensing in Washing Machines and Dish Washers

Reed switches in level sensing application Washing Machine Water Level Washing machines and dishwashers have smaller reservoirs to hold various fluids that help the user in...Continue reading ->

Reed sensors in Telephone Handsets

Reed switches in telephone hook switches Telephone Handset Even though the telephone was ubiquitous in the 80s and 90s even every home or office, it has...Continue reading ->

Magnet sensors for Tension Monitoring in Coil Winders

Magnet sensors in Winding count and tension sensing and in Coil Winders Coil Winder Coil Winders help wind bobbins with Copper wire and these bobbins are used in various applications such as...Continue reading ->

Reed switches in Relays for Fax Machines

Fax machine Fax Machine Facsimile or Fax for short, is the transmission of documents over telephone lines. Although these machines gained maximum...Continue reading ->

Magnet Sensors in Fluid Metering

Water meter Fluid Meter In most large cities, utility companies or closed communities run piped Water and Liquefied Petroleum Gas, LPG, to...Continue reading ->
SM-1322 10W Sub Miniature Reed Switches
13.0 mm x ø2.25 mm, Flattened leads, complete data sheet and technical specifications. This Reed Switch supersedes TRA 2028 and THA 2028 and can be considered a direct equivalent. Customers can safely use SM-1322 in place of MDCG 4, ORD 228 VL, KSK-1A66, RI 23, RD-7B orMKA-14103.
Brand: RRE
Manufacturer: Reed Relays and Electronics
Model: SM-1322
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