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MR231 Heavy Duty Rotary Limit Switch with Encoder-based 4-20mA Position Output

MR231 heavy duty rotary limit switch with precision  encoder-based 4-20mA position output
Quick Guide for Electromechanical Rotary-Linear Limit Switches


Temperature/Humidity Operating = -15°C to +60°C, 0-100% RH
Storage = -30°C to +70°C, 0-100% RH
Extended temperature models (low and high) upon request
Enclosure Rating NEMA/UL 4/4X, IP66
Meterial: Proprietary alloy, copper free die cast aluminum housing with powder coat finish
Switch Rating Mechanical Life = 10 x 10^6 cycles (typical)
Resistive Load = 230 V AC/6A continuous/10A momentary, 24V DC/6A continuous/10A momentary
Inductive Load = 230V AC/Power factor 0.7/3A, 125V DC/0.5A, 80V DC/0.75A, 40V DC/1A, 24V DC/3A
Motor Load = 230V AC/Power factor 0.85/10A
Temperature = -40°C to +85°CNOTE: Special 115 VDC/10A rated switches now available! Contact Micronor Sensors sales for more information. 
Cam Programming Fully programmable double cams = type NK4201.180
1-2 (COM-NC) = Cam valley profile, 4°…180° (1…50%)
1-3 (COM-NO) = Cam valley profile, 4°…356° (1…99%)
Repeatability= 1.8°
Mechanical Rating Max RPM = 1500 rpm
Mechanical Life = 10 x 10^6 cycles (typical)
Max Radial (Side) Shaft Load = 80N (18 lbf)
Max Axial (Thrust) Shaft Load = 40N (9 lbf)
Encoder Rating

Single turn absolute encoder with 4-20mA output
Programmable Zero point (4mA) position
Supply Voltage = 8-32V DC, Typical 15mA @ 24V DC (no load)
Linearity/Accuracy = 0.15%, ±20µA @ 20mA, Internal Resolution = 13 bits

Wire Range 24-10 AWG, 0.25mm^2 to 185mm^2
Phoenix MKDS 5/3-6.35 COMBICON modular wiring blocks with screw connection
Other wiring block options on request

Ordering Information



(8 channels, 40:1, 4-20mA position output)

Lw where w equals the number of cam switch channels, usually 2 or 4 or 6 or 8 channels


Mx or Ux where x equals the gear ratio, standard range is 1:1 to 2500:1, special ratios on request
Standard Single Stage Step Down UY ratio options = U1, U1.25, U2, U2.6, U2.75, U3.5, U4, U5, U6.5
Standard Multistage Step Down MY ratio options = M12.5, M20, M25, M30, M37.5, M40, M50, M52.5, M75, M100, M200, M300, M420, M600, M750, M1600, M2250, M2500


IP66 Heavy Duty Geared Limit Switch with Encoder-based 4-20mA Position Output

MR231 series CE-approved Heavy Duty Geared Limit Switches are for use in the most demanding industrial applications where precision encoder-based 4-20mA position feedback is required – including dam gates, flood control gates, cranes, and drum hoists.

  • Stainless steel single-ended shaft
  • NEMA/UL Type 1/4/4X/IP66 rated enclosure
  • Shaft is standard 1/2″ OD with #404 Woodruff key (included)
  • Choose 2, 4, 6, or 8 cam switch channels
  • Gear ratios from 1:1 to 2500:1
  • Conduit hubs included for 1/2″ NPT
  • Special configurations on request


Call +1-805-389-6600 or email