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MR387 Fiber Optic Emergency Stop

MR387 E-Stop
Quick Guide for Micronor Fiber Optic E-Stop and Microswitch Products


Emergency Stop Sensor

The MR387 Series Emergency Stop Sensor Systems is a new, innovative emergency signaling system that can be deployed in hazardous environments or over long distances – beyond the capabilities of conventional electromechanical solutions. The MR387 E-STOP system employs a photo interrupt scheme operating over a duplex fiber link – multimode 50/125 or 62.5/125 fiber, 9/125 singlemode fiber or 1mm POF.

The MR387 E-STOP is designed for applications where a system needs to be deactivated when the E-STOP switch sensor is depressed or any system malfunction occurs.

Our FO E-Stop Components can be arranged in different ways, click on the following diagrams for more information:

Multiple FO E-Stops
How To Use Multiple Controllers to Extend FO E-Stop Contacts To Multiple Areas


ISO 13850 ISO 13850 defines the characteristics and requirements for a traditional electromechanical E-STOP switch. The MR387 Sensor/Controller integrates the definition of purpose and functionality only.
ISO 13849 Category 2 for MR380/MR387 E-STOP Sensor/Controller System
Functional Safety Consult Declaration of Conformity for additional F.S. information
Classification MR387 Sensor/Controller System = Category 2 per ISO 13849-1
MTTFd 4.14 E+06 hours (473.1 years)
Performance Level PL=c
Safety Integrity Level SIL=1
Functional States MR380 Controller Output States
Normal RESET (Up Position)

Red LED is OFF

Digital 5V and 24V Outputs=HI

Relay NC contacts=Closed, Relay NO contacts=Open

ACTIVATED (Down Position)

Broken Fiber, Loss of Optical Signal, or Controller Failure

Red LED is ON

Digital 5V and 24V Outputs=LOW

Relay NC contacts=Open, Relay NO contacts=Closed

Optical Interface  >
Interface Duplex LC for pigtailed sensors, MR387-X-YY where YY is pigtail length in meters
ODVA IP-LC connector receptacle, MR387-X-D00 sensors in housing
Insertion Loss

MR387-2-XX, 2.5 dB (2 dB Typical), LC-Duplex Pigtail, 62.5/125μm OM-1 MM Fiber

MR387-3-XX, 5.0 dB (3 dB Typical), LC-Duplex Pigtail, 9/125μm OS-1 SM Fiber

MR387-5-XX, 3.5 dB (3 dB Typical), LC-Duplex Pigtail, 50/125μm OM-2 MM Fiber

Consult Application Note AN118 for guidance on determining system loss budget and maximum distance of single and multiple E-Stop networks.

Explosive Atmospheres Inherently Safe, Simple Mechanical Device
EX Classification

Inherently safe, simple mechanical device when used with MR380 Controller

IECEx Test Report GB/CML/ExTR 16.0105.00/00

IEC Ex EPL Mb/Gb/Gc/Db/Dc
North America Exempt, non-electrical
Temperature/Humidity -40°C to +65°C (-40°F to +150°F), 0-95% RH, Non-Condensing
Ingress Protection Pigtailed Version=IP61, Panel Mount Housing=IP65
Housing Aluminum body, anodized finish
Durability 100,000 operations min.
Housing Dimension Consult Mechanical Reference Drawing
Mounting Consult Mechanical Reference Drawing
Unit Weight Sensor with 5 meter pigtail, 240 g (8.5 oz)

Specifications subject to change without notice


  • Sensor is EX classified “Inherently safe, simple mechanical device”
  • Sensor can be operated in any hazardous or explosive environment – gas, dust or mines
  • Immune to EMI, RFI, lightning, and ground loops
  • Immune to high voltage lines
  • Panel mountable sensor
  • DIN rail mountable controller
  • Controller provides DPDT relay and digital signal outputs
  • Operates over long distances – up to 10km (6 miles) with single mode fiber
  • Multiple E-STOP switches can be connected in series
  • Contact Micronor sales regarding our POF E-Stop


Call +1-805-389-6600 or email

Ordering Information

MR387-XY-CZZ Fiber Optic E-Stop with Duplex LC Pigtail:
where X=Fiber type: 2=OM1 62.5/125 MMF, 3=OS1 9/125 SMF, 5=OM2 50/125 MMF
where Y=Mushroom Button Size: S=Small=30mm OD, M=Medium=40mm OD
where Z=Pigtail Length: C1R5=1.5m, C03=3m
Contact Micronor sales for OEM custom pigtail lengths
MR387-XY-D00 Fiber Optic E-Stop in IP Housing:
where X=Fiber type: 2=62.5/125 MMF, 3=9/125 SMF, 5=50/125 MMF
where Y=Mushroom Button Size: S=Small=30mm OD, M=Medium=40mm OD
where D00=Housing with IP-LC Interface

MMF=Multimode Fiber, SMF=Single Mode Fiber

Quick Ship Configurations

MR380-0-UNI Universal SM/MM OEM E-Stop and Switch Controller
MR380-1-3 Universal SM/MM DIN Rail Mount E-Stop and Switch Controller Module
MR387-2S-1R5 E-Stop Sensor with OM1 62.5/125 MMF Pigtail Length=1.5m
MR387-2S-03 E-Stop Sensor with OM1 62.5/125 MMF Pigtail Length=3m
MR387-2S-D00 E-Stop Sensor in Housing with OM1 62.5/125 MMF IP-LC Interface
MR387-3S-1R5 E-Stop Sensor with OS1 9/125 SMF Pigtail Length=1.5m
MR387-3S-03 E-Stop Sensor with OS1 9/125 SMF Pigtail Length=3m
MR387-3S-D00 E-Stop Sensor in Housing with OS1 9/125 SMF IP-LC Interface
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