RoHS Compliant 2. High Contact Reliability Gold-plated contact with self-cleaning, twin contact mechanism provides high contact reliability. Direct mounting to PC board. The terminal pin layout is in inch pitch. 4. Improved Resistance to Soldering Heat The resistance to soldering heat of contacts is improved by blocking heat from terminals by using the printed circuit board. Steel ball adopted to click mechanism for smooth operation. 5. Cylinder Lock Type (MRKC) Cylinder lock mechanism is adopted, enabling choice of various types of key. ■Part Numbering MRK  1  01  2 A  −  R − Z Series code Circuit Function Number of poles Standard type Single Pole Right Angle Circuit Function Number of poles Cylinder Lock Registration number of key （※1） Grip material of key P/C Straight Right Angle

Initial contact resistance 200mΩ max. Dielectric strength Insulation resistance Electrical life Operating force Operating temperature range Storage temperature range ■Key Removable Position 60°step ○：Removable ×：Not removable 《Supplied with switch》 Part name

MRK （45° step 3&4-position） ●PC type  Straight Single Pole, Double Pole Circuit function Key removable position Part No. Connecting position Circuit diagram Ⅰposition Ⅱ position Ⅲ position Ⅳ position ★MRK1031D−Z ★MRK2031D−Z ★MRK1031D−R−Z ▲MRK2031D−R−Z ▲MRK1031E−Z ▲MRK2031E−Z ▲MRK1031E−R−Z ▲MRK2031E−R−Z ▲MRK1031F−Z ▲MRK2031F−Z ★MRK1031F−R−Z ▲MRK2031F−R−Z ●In single pole versions, terminals (C2), (5), ★MRK1031G−Z (6), and (7) are not provided. ▲MRK2031G−Z ●Terminal numbers are not shown on the switch. ▲MRK1031G−R−Z ●In switches with switching function D, E, F, G, H, K, ▲MRK2031G−R−Z and L, terminals...

Part No. marldnfl X (*) :C2 is not available in single pole versions. (ON) Momentary •Right Angle Single Pole Double Pole Part No. (*) :C2 is not available in single pole versions. (ON) Momentary ★ : Made to order products. ☆: Semi-standard products. ▲ : Inquiry products.

Single Pole, Double Pole •In single pole versions, terminals (C2), (5), (6), and (7) are not provided. •Terminal numbers are not shown on the switch. (*):C2 is not available in single pole versions. (ON):Momentary •In single pole versions, terminals (C2), (5), (6), and (7) are not provided. •Terminal numbers are not shown on the switch. The box 1 should show Key Registration No. and Key Grip Material Code.

•In single pole versions, terminals (C2), (5), (6), and (7) are not provided. •Terminal numbers are not shown on the switch. (1):C2 is not available in single pole versions. (ON) Momentary •Right Angle Single Pole, Double Pole Part No. (1):C2 is not available in single pole versions. (ON): Momentary •In single pole versions, terminals (C2), (5), (6), and (7) are not provided. •Terminal numbers are not shown on the switch. The box 1 should show Key Registration No. and Key Grip Material Code. : Made to order products. ▲ : Inquiry pro

•In single pole versions, terminals (C2), (5), (6), and (7) are not provided. •Terminal numbers are not shown on the switch. •PC type Single Pole, Double PoleStraight (*) :C2 is not available in single pole versions. (ON) Momentary Single Pole, Double Pole Part No. (*) :C2 is not available in single pole versions. (ON) Momentary •In single pole versions, terminals (C2), (5), (6), and (7) are not provided. •Terminal numbers are not shown on the switch. The box § should show Key Registration No. and Key Grip Material Code. (ON) : Momentary. ▲ : Inquiry products.

MRK MRKC ・ ■PC Hole Layouts （Top View） Poles Single pole ・ Double poles Right angle Right angle For stand-off pins For terminal pins ■Key Mounting Dimensions Series Grip Material MRKC Metal ⑴Manual Soldering Device ： Solder iron. 360℃ Max. 3 sec. Max. ⑵Auto Soldering Method：Jet wave or dip type 275℃ Max. 6 sec. Max ●Preheat should be within 80-120℃, 120sec. ⑴Solvent : Alcohol type. ⑵ MRK and MRKC series are not washable. To wash the PC board, clean the soldering surface of the PC board with a brush so that the switch is not exposed to the cleaning sol