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MR221 MR222 Series Heavy Duty Rotary Limit Switch

Programmable NK double cam operation shown with S840 V20 microswitch

Quick Guide for Electromechanical Rotary-Linear Limit Switches

Specifications

Temperature/Humidity	Limit Switches Only, -40°C to +85C, 0-100% RH Limit Switches With Transducer Output, +0°C to +70°C Limit Switches with Encoder Output, -40°C to +85°C, 0-100% RH
Enclosure Rating	Both Al and SS models rated NEMA/UL 1/4/4X, IP66 Al Housing = Proprietary copper-free alloy, die cast aluminum alloy housing with powder coat finish SS Housing = Stainless Steel
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)
-1 OPTION MR265 4-20mA Position Transducer Output	Type= MR265, Precision Potentiometer-Based, Loop Powered 4-20mA Output Loop Volage =24-30V DC External Burden Resistance = 500Ω Linearity/Accuracy = ± 0.5%, Operating Temperature Range = 0-70°C
-E OPTION Absolute Encoder-Based 4-20mA Position Output	Type= ESAV361 ST Absolute Encoder with 4-20mA Output, Magnetic Power = 10-30V DC Resolution = 12 bits Accuracy = ± 0.5° Operating Temperature Range = -40°C to +85°C
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

MR221-Lw-Mx-y-z
MR222-Lw-Mx-y-z

Example:
MR221-L8-M40-0
(8 channels, 40:1, Aluminum housing, Position Ouput option)

MR221 for one-ended shaft model
MR222 for two-ended shaft modelLw 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

y represents the Position Output option, where z=0=No Position Output, z=1=MR265 Transducer-based 4-20mA Output, and z=E=Encoder-based 4-20mA Output.

z housing option where y=(blank) for Standard Die Cast Aluminum Housing, y=X for Optional Stainless Steel Housing

MR221 MR222

IP66 Heavy Duty Geared Limit Switch

MR221/MR222 series CE-approved Heavy Duty Geared Limit Switches are for use in the most demanding industrial applications – including cranes, hoists, presses, packers, machine tools, handling devices and other similar operations where motion is expressed in shaft rotation.

MR221 for single-ended shaft applications
MR222 series where double-ended shaft is required
NEMA/UL Type 1/4/4X/IP66 rated enclosures – choice of Standard die cast aluminum or Special stainless steel
Standard shaft is 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
Position Output options – Transducer or Encoder based 4-20mA Output
Conduit hubs included for 1/2″ NPT
Special configurations on request