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MR386 Fiber Optic Microswitch

MR386 Fiber Optic Microswitch
MR386 Fiber Optic Microswitch GIF

The MR386 ZapFREE® Fiber Optic Microswitch paired with a MR380 series Controller provides a innovative signaling solution that can be deployed in challenging and hazardous environments over long distances. The switch sensor employs a photo interrupt scheme operating over a duplex multimode optical link that allows for reliable signal detection. This product provides the same mechanical attributes and form factor as ubiquitous electrical micro switches.




MR386 Shares V Series Form Factor Compatibility – Omron VAL2 Roller Leaf Spring Arm accessory kit mounted on MR386 Microswitch:


FO Microswitch and E-Stop can be wired in series to provide a tamperproof fiber optic interlock system:

E-Stop and Microswitch can be wired in series for a tamperproof fiber optic interlock system
Quick Guide for Micronor Fiber Optic E-Stop and Microswitch Products


Switching Characteristics
Durability > 1,000,000 Operations minimum
Actuation Force (typ.) MRI: 1.49 N (150 gF)
Industrial: 0.49 N (50 gF)
Release Force (typ.) MRI: 0.49 N (50 gF)
Industrial: 0.13 N (13gF)
Switching Hysteresis (typ.) MRI: 0.25mm
Industrial: 0.26mm
Operating Frequency 150 operations per minute max
Optical Interface
Pigtail Configuration LC Duplex Plug, Fiber type and pigtail per ordering coder
Insertion Loss For MR386-2x-YY; IL=3.5dB max (3.0dB typical), 62.5/125μm OM1 MM Fiber
Maximum Distance Distance depends on the user’s system loss budget which is the total round-trip loss of all optical link components. Consult Application Note AN118 for more information about determining optical loss margin for single and multiple Microswitch networks.
Temperature/Humidity Non-Metallic: -5°C to +60°C (-23°F to +140°F)
Industrial Model: -40°C to +80°C (-40°F to +150°F)
15-90% RH, Non-Condensing
MR Attributes ACR Guidance Document for Safe MR Practices
MRI Useage Zones MRI Safe sensor is designed for safe use in all MR Zones I-V
Both immune and invisible to the MRI electromagnetic field
Materials Non-metallic except for fiber optic connector end
Explosive Atmospheres Inherently Safe, Simple Mechanical Device
EX Classification Inherently safe, simple mechanical device when used with MR380 series Multimode Controller
IECEx Test Report GB/CML/ExTR 16.0105.00/00
IECEx EPL Mb/Gb/Gc/Db/Dc
North America Exempt, non-electrical
Physical Attributes  
Housing Dimension V15 compatible, Consult Mechanical Reference Drawing
Unit Weight Sensor with 1.5 meter pigtail, 15 g (0.53 oz)

Specifications subject to change without notice


  • Two models offered: Industrial and Non-Metallic MRI Safe
  • Two switching options offered: Normally Open and Normally Closed
  • Multimode 62.5/125
  • Interchangeable with V15 series electrical micro switch
  • Immune to EMI, RFI, lightning and ground loops
  • Immune to high voltage lines
  • Operates over long distances-up to 1.5km
  • Ex classified inherently safe, simple mechanical device is approved for EPL Mb/Gb/Gc/Db/Dc applications


Call +1-805-389-6600 or email

Ordering Information

(MR Safe Version)
MR Safe, Non Metallic FO Microswitch:
where X=Fiber type: 2=OM1 62.5/125 MMF
where Y=Optical Option: 0=NO, 4=NC
where Z=Pigtail Length: 1R5=1.5m, 03=3m
Contact Micronor sales for OEM custom pigtail lengths
(Industrial Version)
Industrial Grade FO Microswitch:
where X=Fiber type: 2=62.5/125 MMF
where Y=Optical Option: 1=NO, 5=NC
where Z=Pigtail Length: 1R5=1.5m, 03=3m
Contact Micronor sales for OEM custom pigtail lengths

MMF=Multimode Fiber

Quick Ship Configurations

MR380-0-UNI Universal SM/MM OEM E-Stop and Microswitch Controller Board
MR380-1-3 Universal SM/MM DIN Rail Mount E-Stop and Microswitch Controller Module
MR386-20-1R5 MR Safe Microswitch, NO, Pigtail=1.5m
MR386-24-1R5 MR Safe Microswitch, NC, Pigtail=1.5m
MR386-21-1R5 Industrial Microswitch, NO, Pigtail=1.5m
MR386-25-1R5 Industrial Microswitch, NC, Pigtail=1.5m