MRK・MRKC Key Switches RoHS Compliant ■Features 1. For PCB Mounting 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 3. Smooth Operation 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 Series code 01 2 Circuit Function Standard type 1 R − Z Terminals Key Removable Positions Number of poles MRK − A Angle of Throw 01 Single Pole ★2 Double Pole ON 02 ON 03 ー ON ー （ON） 1 45° None P/C Straight 2 90° R Right Angle ON ーONー ON 04 ONーONーONーON MRKC 2 Series code 01 Circuit Function Number of poles MRKC Cylinder Lock 01 ★2 Double Pole 03 Key Removable Positions Terminals Registration number of key （※1） Grip material of key Angle of Throw ON 02 ON ★1 Single Pole A − R − 01 R − Z 3 ー ON ー （ON） 1 45° None 2 90° R 3 60° ON ーONー ON ーONー （ON） 04 （ON） P/C Straight Right Angle None Metal B Plastic （※１）For MRKC series, 6 types of keys are available. (01~03, 01B~03B) （ON） ：Momentary. ★：Made to order products. MRK・MRKC ■ Specications 0.4VA max. （20VDC max.） Rating （0.5mA 200μVAC） Initial contact resistance 200mΩ max. Dielectric strength 250VAC 1 minute Insulation resistance 100MΩ min. Electrical life 10,000 cycles MRK Operating force Operating temperature range Storage temperature range （100VDC） 2.94±0.98N・cm MRKC 2.94±1.47N・cm −20℃〜＋70℃ −40℃〜＋80℃ ■Angle of Throw 45°step Shown in PositionⅡ ■Key Removable Position 60°step Key position 90°step Shown in PositionⅡ Code Ⅰ Ⅱ Ⅲ Ⅳ A ○ ○ − − B ○ × − − C × ○ − − D ○ ○ ○ ○ E × ○ ○ − F × × ○ − G ○ ○ × − H ○ × ○ − K ○ × × − L × ○ × − Shown in PositionⅠ ○：Removable ×：Not removable ■ Standard Accessories 《Supplied with switch》 Part name Key Series MRK Part No. 140007050010 MRKC 140009002602 140009003061 Key type "01" Key type "01B" Metal Plastic Dimensions Grip material ● Each switch comes with two keys. Plastic MRK（45° step 3&4-position） ●PC type Straight Single Pole, Double Pole Circuit function Key removable position Part No. A portion 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 (4) and (8) are not provided. ▲MRK1031H−Z ▲MRK2031H−Z ▲MRK1031H−R−Z ▲MRK2031H−R−Z ●Right Angle Single Pole ★MRK1031K−Z ▲MRK2031K−Z ▲MRK1031K−R−Z ▲MRK2031K−R−Z ★MRK1031L−Z ▲MRK2031L−Z ★MRK1031L−R−Z ▲MRK2031L−R−Z ★MRK1041D−Z ▲MRK2041D−Z ▲MRK1041D−R−Z ▲MRK2041D−R−Z Ⅰposition Ⅱ position Ⅲ position Ⅳ position ○ ○ ○ − − ○ ○ − − ○ − − − ON ON ON − ○ ○ − − ○ − − − − ○ ○ ○ ○ ON ON ON ON ○ ○ ○ Single Pole C1−1 C1−2 C1−3 C1−4 Connecting terminals Double Pole C1−1 C1−2 C1−3 C1−4 C2−5 C2−6 C2−7 C2−8 ●Terminal numbers are not shown on the switch. （＊） ：C2 is not available in single pole versions. Double Pole ●Terminal numbers are not shown on the switch. ▲：Inquiry products. ★：Made to order products. ●Position IV is not available in MRK1031 and MRK2031series. MRK（90° step 2−position） ●PC type Straight Single Pole, Double Pole Circuit function Key removable position Part No. A portion Connecting position Circuit diagram Ⅰposition Ⅱ position ☆MRK1012A−Z ▲MRK2012A−Z ○ ☆MRK1012B−Z ▲MRK2012B−Z ○ ★MRK1012C−Z ▲MRK2012C−Z ●In single pole versions, terminals (C2), (5), and (6) are not provided. ●Terminal numbers are not shown on the switch. ★MRK1022B−Z ▲MRK2022B−Z Ⅰposition Ⅱ position ON ON ON （ON） C1−1 C1−2 C1−1 C2−5 C1−2 C2−6 ○ ○ ○ Single Pole Connecting terminals Double Pole （＊） ：C2 is not available in single pole versions. （ON） ：Momentary ●Right Angle Single Pole Circuit function Key removable position Part No. A portion Connecting position Circuit diagram Ⅰposition Ⅱ position ★MRK1012A−R−Z ★MRK2012A−R−Z ○ ☆MRK1012B−R−Z ★MRK2012B−R−Z ○ ▲MRK1012C−R−Z ▲MRK2012C−R−Z ▲MRK1022B−R−Z ▲MRK2022B−R−Z Ⅰposition Ⅱ position ON ON ON （ON） Single Pole C1−1 C1−2 Double Pole C1−1 C2−5 C1−2 C2−6 ○ ○ ○ Connecting terminals ●Terminal numbers are not shown on the switch. Double Pole （＊） ：C2 is not available in single pole versions. （ON） ：Momentary ●Terminal numbers are not shown on the switch. ★：Made to order products. ☆：Semi-standard products. ▲：Inquiry products. （ON） ：Momentary. MRKC（45° step 3−position） ●PC type Straight Single Pole, Double Pole Circuit function Key removable position Part No. A portion Connecting position Circuit diagram （＊） Ⅰposition Ⅱ position Ⅲ position ●In single pole versions, terminals (C2), (5), (6), and (7) are not provided. ●Terminal numbers are not shown on the switch. ★MRKC1031L−01−Z ▲MRKC1031L− ※ −Z ▲MRKC2031L− ※ −Z ○ ★MRKC1041L−01−Z ★MRKC1041L−01B−Z ▲MRKC1041L− ※ −Z ▲MRKC2041L− ※ −Z ○ Ⅰposition Ⅱ position Ⅲ position ON ON ON （ON） ON （ON） Single Pole C1−1 C1−2 C1−3 Double Pole C1−1 C1−2 C1−3 C2−5 C2−6 C2−7 Connecting terminals （＊） ：C2 is not available in single pole versions. （ON） ：Momentary ●Right Angle Single Pole, Double Pole Circuit function Key removable position Part No. A portion Connecting position Circuit diagram Ⅰposition Ⅱ position Ⅲ position ▲MRKC1031L−R−01−Z ▲MRKC1031L−R− ※ −Z ▲MRKC2031L−R− ※ −Z ○ ▲MRKC1041L−R− ※ −Z ▲MRKC2041L−R− ※ −Z ○ Ⅰposition Ⅱ position Ⅲ position ON ON ON （ON） ON （ON） 1−pole C1−1 C1−2 C1−3 2−pole C1−1 C1−2 C1−3 C2−5 C2−6 C2−7 Connecting terminals （＊） ：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. ▲：Inquiry products. （ON） ：Momentary. ★：Made to order products. MRKC（60° step 3−position） ●PC type Straight Single Pole, Double Pole Circuit function Key removable position Part No. A portion Connecting position Circuit diagram （＊） Ⅰposition Ⅱ position Ⅲ position ▲MRKC1033D− ※ −Z ▲MRKC2033D− ※ −Z ○ ○ Ⅰposition Ⅱ position Ⅲ position ○ ON ▲MRKC1033L− ※ −Z ▲MRKC2033L− ※ −Z ON ON ○ Single Pole C1−1 C1−2 C1−3 Double Pole C1−1 C1−2 C1−3 C2−5 C2−6 C2−7 Connecting terminals ●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 ●Right Angle Single Pole, Double Pole Circuit function Key removable position Part No. A portion Connecting position Circuit diagram （＊） Ⅰposition Ⅱ position Ⅲ position ★MRKC1033D−R−01−Z ▲MRKC1033D−R− ※ −Z ▲MRKC2033D−R− ※ −Z ○ ▲MRKC1033L−R− ※ −Z ▲MRKC2033L−R− ※ −Z ○ Ⅰposition Ⅱ position Ⅲ position ○ ON ON ON ○ Single Pole C1−1 C1−2 C1−3 Double Pole C1−1 C1−2 C1−3 C2−5 C2−6 C2−7 Connecting terminals （＊） ：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. ★：Made to order products. ▲：Inquiry products. MRKC（90° step 2−position） ●PC type Straight Single Pole, Double Pole Circuit function Key removable position Part No. A portion Connecting position Circuit diagram （＊） Ⅰposition Ⅱ position ★MRKC1012A−01−Z ▲MRKC1012A− ※ −Z ▲MRKC2012A− ※ −Z ○ ▲MRKC1012B− ※ −Z ▲MRKC2012B− ※ −Z ○ ▲MRKC1022B− ※ −Z ▲MRKC2022B− ※ −Z ○ Ⅰposition Ⅱ position ON ON ON （ON） Single Pole C1−1 C1−2 Double Pole C1−1 C2−5 C1−2 C2−6 ○ Connecting terminals ●In single pole versions, terminals (C2), (5), (6), and (7) are not provided. ●Terminal numbers are not shown on the switch. ●Right Angle （＊） ：C2 is not available in single pole versions. （ON） ：Momentary Single Pole, Double Pole Circuit function Key removable position Part No. A portion Connecting position Circuit diagram （＊） Ⅰposition Ⅱ position ▲MRKC1012A−R−01−Z ▲MRKC1012A−R− ※ −Z ▲MRKC2012A−R− ※ −Z ○ ▲MRKC1012B−R− ※ −Z ▲MRKC2012B−R− ※ −Z ○ Ⅰposition Ⅱ position ON ON Single Pole C1−1 C1−2 Double Pole C1−1 C2−5 C1−2 C2−6 ○ Connecting terminals （＊） ：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. ★：Made to order products. MRK・MRKC ■PC Hole Layouts （Top View） Poles Single pole ・ Double poles Steps 2−step （90° ） Terminals 3−step （45° ・60° ） 4−step （45° ） PC type Straight Right angle PC type Straight Right angle For stand-off pins For terminal pins ■Key Mounting Dimensions Series MRK Grip Material Plastic MRKC Metal Plastic Dimensions ■Precautions 1. Soldering 2. Flux Cleaning 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 solution. Specications subject to change without notice.