Distinctive Characteristics
Actual Size
Low profile body of MRF model accommodates space limitations  required for PCB mounting.  For the MRA and MRK bushing  mount models, the range of behind panel body depths is .323”  to .669” (8.2mm to 17.0mm).
Positive detent mechanism for distinct feel and audible feedback.  Metal bushing and housing construction increases durability.  Adjustable stopper plate allows 2–12 position settings. High contact reliability achieved by the self-cleaning contact mechanism.
Break-before-make contact timing with sliding contacts in MRA and rotary contactor disk in MRF and MRK models. Interior housing seal and molded-in PC terminals, plus shaft  rubber o-ring on MRF and MRK and polyamide cover on MRF model, allow cleaning after automated soldering.
Exterior rubber washer and double flatted bushing on MRA and MRK
give protection in splashproof applications.
General Specifications
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: 50G (490m/s2) acceleration (tested in 3 right angled directions, with 3 shocks in each direction)
Installation
Mounting Torque: .686Nm (6.08 lb•in)
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
UL Recognition MRA, MRF, & MRK models have not been tested for UL recognition or CSA certification.
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.
TYPICAL SWITCH ORDERING EXAMPLE
DESCRIPTION FOR TYPICAL ORDERING EXAMPLE
MRA206-A
No Code Black
For Color Tipped
A Black
B White C
Red E Yellow F Green G Blue H
Gray
A
Shaft Actuated with PC Terminals
ACTUATORS & TERMINALS
Shaft          T erminal
Shaft Actuated with Plain Black Knob DP with 2-6
Adjustable Positions
PC Terminals
F
Low Profile
Screwdriver Actuated with PC Terminals
K
Low Profile Shaft Actuated with PC Terminals
Slotted for Terminal Screwdriver
Shaft Terminal
.124
Thk = (0.25)          .010
Thk = (0.25)          .010
Thk = (0.25)          .010
POSITION SETTING FOR MRA, MRF, & MRK MODELS
Each switch is supplied with the stopper set for the maximum number of positions allowed for that model.  Prior to installation,  the desired position setting should be made.  Contact factory for continuous rotation.
MRF Models
1.  Remove the protective cover from the switch body.
2.  Turn the shaft counterclockwise to the extreme left by using a screwdriver.
3.  Inside the cover is a magnifying lens which would be positioned over the  number which is to be the maximum position used; when the cover is then  snapped into the switch, the projection beside the lens fits into the correct  hole for setting the stop.
MRK & MRA Models
1.  Using the actuator knob, turn the shaft  counterclockwise to the extreme left.  If  the shaft is not turned counterclockwise  to the extreme left, proper setting can-  not be achieved.  At this extreme posi-  tion, the white line on the knob points  to the number 1 position shown on the  side of the switch.
2.  Remove the knob from the shaft and  loosen the nut far enough to allow rais-  ing the stopper plate, plus washer(s),  for resetting to the desired position.
3.  Note the position numbers on the side  of the switch; these correspond to the  terminal numbers and stopper holes.  Insert the stopper in the hole numbered  for the maximum desired number of  stop settings.  Satisfactory switch func-  tioning cannot be assured if the stopper  plate is not properly positioned.
4.  Tighten the nut (beveled side up) firmly  against the stopper plate.
Standard Mounting Hardware Packaged Loose with Each Switch:
TYPICAL SWITCH DIMENSIONS
profile中文
Single Pole MRA112
MRA • PC Terminals
1 Pole
2 Pole
4 Pole
MRF • PC Terminals
1 Pole
2 Pole    4 Pole
MRA112
MRK112
MRK devices are designed to be panel mounted.  Installation without panel mounting will affect reliability.
MRK • PC Terminals
1 Pole
2 Pole    4 Pole
MRF403
FOOTPRINTS
Double Pole MRA206
Four Pole MRA403
Single Pole MRF112MRK112
Double Pole MRF206MRK206
Four Pole MRF403MRK403
.124
KNOBS
A
AT433
Plain Black
Color Codes:
Black
White
Red
Yellow
Green
Blue
A
B
C
E
F
G
Gray
H
Base Material:  Polyester Base Color:Black
Polyamide Tip Colors:
A, B, C, E, F , G, H
Material:Polyacetal Color: Black only
Base Material:Polyester Base Color:  Black
Polyamide Tip Colors:
A, B, C, E, F , G, H
B
AT4103 Small Color Tipped
C
AT4104 Large Color Tipped
PANEL CUTOUTS & MAXIMUM EFFECTIVE PANEL THICKNESS
Without
Keyway
STANDARD MOUNTING HARDWARE
AT513M
Metric Hexagon Nut Material:
Brass, nickel plating 1 for MRA; 1 for MRK
AT507M
Metric Locking Ring
Material:
Steel, chromate over zinc plating 1 for MRA; 1 for MRK
AT509  Lockwasher
Material:
Steel, chromate over zinc plating 1 for MRA; 1 for MRK
AT535
Rubber Ring
Material:
Nitrile butadiene rubber
1 for MRK
Nonsealed Panel
Sealed Panel
With Standard Hardware on Nonsealed Panel:MRA .067” (1.7mm)  MRK .087” (2.2mm)Without Locking Ring on Nonsealed Panel:MRA .098” (2.5mm)  MRK .118” (3.0mm)
With Standard Hardware on Sealed Panel:MRK .106” (2.7mm)
With Keyway
.250
.250.087
OPTIONAL SUPPORT BRACKET
AT543
Support Bracket for MRK Material:
Steel with tin plating
A support bracket  is needed when  the MRK is mounted  only to a PC board
and does not have  the bushing through  a panel.
.150

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