Series MR
Half-Inch Diameter Process Sealed Rotaries
General Specifications
Electrical Capacity (Resistive Load)
For MRAN:
250mA @ 125V AC
For MRF or MRK:
0.4VA maximum @ 28V AC/DC maximum
(Applicable Range 0.1mA ~ 0.1A @ 20mV ~ 28V)
Note: Find additional explanation of operating range in Supplement section.
Other Ratings
Contact Resistance:
Insulation Resistance:
Dielectric Strength:
10 milliohms maximum for MRAN; 50 milliohms maximum for MRF & MRK
100 megohms minimum @ 500V DC
1,000V AC minimum for 1 minute minimum for MRAN
500V AC minimum for 1 minute minimum for MRF & MRK
30,000 operations minimum
Mechanical Life:
Electrical Life:
10,000 operations minimum
Range of Operating Torque:
Contact Timing:
0.02 ~ 0.07Nm for MRAN; 0.005 ~ 0.02Nm for MRF & MRK
Nonshorting (break-before-make)
MRAN – self-cleaning, sliding contact; MRF & MRK – self-cleaning, rotary contactor disk
30°
Indexing:
Materials & Finishes
Shaft:
Brass with nickel plating
Stopper Plate:
Steel with zinc plating for MRAN & MRK; polyamide cover with stopper for MRF
Zinc alloy with zinc plating
Copper with silver plating for MRAN; phosphor bronze with gold plating for MRF & MRK
Brass with silver plating for MRAN; phosphor bronze with gold plating for MRF & MRK
Brass with silver plating for MRAN; phosphor bronze with gold plating for MRF & MRK
Diallyl phthalate for MRAN; fiberglass reinforced polyamide for MRF & MRK
Bushing/Housing:
Movable Contacts:
End Contacts & Terminals:
Common Contacts & Terminals:
Base:
G
Environmental Data
Operating Temperature Range:
Humidity:
–10°C through +70°C (+14°F through +158°F)
90 ~ 95% humidity for 96 hours @ 40°C (104°F)
Vibration:
10 ~ 55Hz with peak-to-peak amplitude of 1.5mm traversing the frequency range & returning
in 1 minute; 3 right angled directions for 2 hours
Shock:
Sealing:
50G (490m/s2) acceleration (tested in 3 right angled directions, with 3 shocks in each direction)
MRK model meets IP67 of IEC 60529 standards
Installation
Mounting Torque:
.686Nm (6.08 lb•in)
Processing
Soldering Time & Temperature:
Wave Soldering for MRAN: See Profile A in Supplement section.
Wave Soldering for MRF & MRK: See Profile B in Supplement section.
Manual Soldering for MRAN: See Profile A in Supplement section.
Manual Soldering for MRF & MRK: See Profile B in Supplement section.
Automated cleaning recommended. Stopper plate, as well as washers for MRAN & MRK, must be in
place to maintain automated cleaning. See Cleaning specifications in Supplement section.
Cleaning:
Standards & Certifications
MRAN, MRF, & MRK models have not been tested for UL recognition or CSA certification.
These switches are designed for use in a low-voltage, low-current, logic-level circuit.
When used as intended in a logic-level circuit, the results do not produce hazardous energy.
G16
www.nkkswitches.com
10/10/23
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