Series MR

Half-Inch Diameter Process Sealed Rotaries

www.nkk.com

G16

G

Electrical Capacity (Resistive Load)

For MRA:

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:

10 milliohms maximum for MRA; 50 milliohms maximum for MRF & MRK

Insulation Resistance:

100 megohms minimum @ 500V DC

Dielectric Strength:

1,000V AC minimum for 1 minute minimum for MRA

500V AC minimum for 1 minute minimum for MRF & MRK

Mechanical Life:

30,000 operations minimum

Electrical Life:

10,000 operations minimum

Range of Operating Torque:

0.02 ~ 0.07Nm for MRA; 0.005 ~ 0.02Nm for MRF & MRK

Contact Timing:

Nonshorting (break-before-make)

MRA – self-cleaning, sliding contact; MRF & MRK – self-cleaning, rotary contactor disk

Indexing:

30°

Materials & Finishes

Shaft:

Brass with nickel plating

Stopper Plate:

Steel with zinc plating for MRA & MRK; polyamide cover with stopper for MRF

Bushing/Housing:

Zinc alloy with zinc plating

Movable Contacts:

Copper with silver plating for MRA; phosphor bronze with gold plating for MRF & MRK

End Contacts & Terminals:

Brass with silver plating for MRA; phosphor bronze with gold plating for MRF & MRK

Common Contacts & Terminals:

Brass with silver plating for MRA; phosphor bronze with gold plating for MRF & MRK

Base:

Diallyl phthalate for MRA; fiberglass reinforced polyamide for MRF & MRK

Environmental Data

Operating Temperature Range:

–10°C through +70°C (+14°F through +158°F)

Humidity:

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:

MRK model meets IP67 of IEC60529 standards

Installation

Mounting Torque:

Cap Installation Force:

19.6 ~ 29.4N (4.41 ~ 6.61 lbf) for MRA & MRK

Processing

Soldering Time & Temperature:

Wave Soldering for MRA: See Profile A in Supplement section.

Wave Soldering for MRF & MRK: See Profile B in Supplement section.

Manual Soldering for MRA: See Profile A in Supplement section.

Manual Soldering for MRF & MRK: See Profile B in Supplement section.

Cleaning:

Automated cleaning recommended. Stopper plate, as well as washers for MRA & MRK, must be in

place to maintain automated cleaning. See Cleaning specifications in Supplement section.

Standards & Certifications

MRA, 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.