MK21 Series MEDER electronic Reed Sensors with Mounting Holes for Screw Fastening DESCRIPTION MK21 sensors are magnetically operated Reed proximity switches designed for screw mounting. The sensor should be mounted on a fixed surface with the actuating magnet on the moving surface. Introduction or removal of the magnetic field determines the closing and opening of the Reed Switch. Leads are Teflon coated. Designed for extreme environment. Resistant to water, fuels, oils, inks and most acids. APPLICATIONS FEATURES • Position and limit switch Pneumatic or hydraulic actuator position • End motion detection for linear drive Indication and end travel limit switch • Machine industry End motion detection and door/flap control • High power switches available • Designed for high temperature up to 160o C (molded version) • Four operate sensitivities available • A choice of cable terminations and lengths are available • Molded and potted versions available DIMENSIONS All dimensions in mm [inch] www.meder.com 270 MEDER electronic MK21 Series Reed Sensors with Mounting Holes for Screw Fastening ORDER INFORMATION Part Number Example MK21M - 1A66 C - 500 MK21P - 1A66 C - 500 W W Series Contactform Switch Model Magnetic Sensitivity Cable Length (mm) Termination MK21x- xx xx x- xxx W M = molded P = potted 1 Form A 66 is the switch model C is the magnetic sensitivity 500 is the cable length (mm) Options 66 B, C, D, E 52, 85 C, D, E 90 C, D, E 1 Form B“* 1 Form C** 500* * Other cable lengths available ** Potted version MAGNETIC SENSITIVITY Sensitivity Class Pull In AT Range B 10 - 15 C 15 - 20 D 20 - 25 E 25 - 30 TERMINATION For wire and termination details, as well as other magnetic sensitivity classes please contact factory. W The cable cut length includes: 5 mm of wire stripped and tinned. www.meder.com 271 MEDER electronic MK21 Series Reed Sensors with Mounting Holes for Screw Fastening CONTACT DATA Switch Model → Contact Form → All Data at 20° C Contact Ratings Conditions Switching Power Any DC combination of V & A not to exceed their individual max.‘s Switching Voltage Switch 52 Form A Min. Typ. Max. Switch 66 Form A Min. Typ. Max. Unit 50 70 (VA) 10 W DC or peak AC 250 200 V Switching Current DC or peak AC 0.5 0.5 A Carry Current DC or peak AC 2.5 1.25 A Static Contact Resistance w/ 0.5 V & 10 mA 200 150 mΩ 200 mΩ Measured w/ 0.5 V & 50 mA , Dynamic Contact Resistance 1.5 ms after closure Insulation Resistance across 100 volts applied Contact 1010 1010* Ω Breakdown Voltage across Contact Voltage applied for 60 sec. min. 600 225* VDC Operate Time incl. Bounce Measured w/ 100 % overdrive 1.0 0.5 ms Release Time Measured w/ no coil suppression 0.1 0.1 ms Capacitance at 10 kHz cross contact 0.2 0.2 pF Contact Operation ** Must Operate Condition Steady state field 10 30 10 60 AT Must Release Condition Steady state field 4 27 4 54 AT g Environmental Data Shock Resistance 1/2 sinus wave duration 11 ms 50 50 Vibration Resistance From 10 - 2000 Hz 20 20 g Ambient Temperature M 10°C/ minute max. allowable -20 85 -30 150 o Ambient Temperature P 10°C/ minute max. allowable -35 85 -20 85 o C -40 160 o C 260 o Stock Temperature 10°C/ minute max. allowable 260 Soldering Temperature 5 sec. 260 C C Please note: The indicated electrical data are maximum values and can vary downwards when using a more sensitive switch. * Insulation resistance of 1012 and breakdown voltage of 480 VDC is available. ** These ranges refer to the uncut / unmodified Reed Switches described in our Reed Switch section. Consult factory if more detail is required. www.meder.com 272 MEDER electronic MK21 Series Reed Sensors with Mounting Holes for Screw Fastening CONTACT DATA All Data at 20° C Switch Model → Contact Form → Contact Ratings Conditions Switch 85 Form A Switch 90 Form B/C, potted Min. Typ. Max. Min. Typ. Max. Unit Switching Power Any DC combination of V & A not to exceed their individual max.‘s 100 20 W Switching Voltage DC or peak AC 400 175 V Switching Current DC or peak AC 1.0 0.5 A Carry Current DC or peak AC 2.5 1.0 A Static Contact Resistance w/ 0.5 V & 10 mA 150 150 mΩ Dynamic Contact Resistance Measured w/ 0.5 V & 50 mA , 1.5 ms after closure 200 250 mΩ Insulation Resistance across 100 volts applied Contact 1010 109 Ω Breakdown Voltage across Contact Voltage applied for 60 sec. min. 4000 200 VDC Operate Time incl. Bounce Measured w/ 100 % overdrive 1.0 0.7 ms Release Time Measured w/ no coil suppression 0.1 1.5 ms Capacitance at 10 kHz cross contact 0.2 1.0 pF Contact Operation ** Must Operate Condition Steady state field 20 60 Must Release Condition Steady state field 12 54 15 40 AT AT Environmental Data Shock Resistance 1/2 sinus wave duration 11 ms 50 50 g Vibration Resistance From 10 - 2000 Hz 20 20 g Ambient Temperature M 10°C/ minute max. allowable -20 85 -20 85 o C Ambient Temperature P 10°C/ minute max. allowable -35 85 -35 85 o C C C Stock Temperature 10°C/ minute max. allowable 260 260 o Soldering Temperature 5 sec. 260 260 o Please note: The indicated electrical data are maximum values and can vary downwards when using a more sensitive switch. * Insulation resistance of 1012 and breakdown voltage of 480 VDC is available. ** These ranges refer to the uncut / unmodified Reed Switches described in our Reed Switch section. Consult factory if more detail is required. www.meder.com 273 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Standex Electronics: MK21M-1A66B-500W MK21-1A66B-500W MK21-1A66C-500W