Back Lighted PushButton Switch A3C Cylindrical 12mm dia. Pushbutton Series with Superb Operability, High Visibility and Compact Housing Three models of pushbutton units (round, square and rectangular), two types of light-emitting elements (LED and lamp) and two types of switch units (switching general-purpose and microcurrent/ voltage loads) available. Models that can be used as an indicator also available. Requires only 20mm mounting depth. All LEDs, lamps, lenses and legends replaceable without tools. Degree of protection conforms to IP40. UL (E41515) and CSA (LR45258–31) approved. Ordering Information Illuminated types When placing your order, specify the individual component part model numbers of the screen, LED/lamp and switch unit as listed in the ordering tables below. Screen LED/Lamp Incandescent Lamp LED A3C-–500- Switch Unit A3B–0--- A3B–0--- A3C-–7--M2C-–7---* * Model number unique for indicator unit Screen LED Illuminated Shape Rectangular Incandescent Lamp Illuminated Square Round Button colour Red Yellow Green White Note: Shape Rectangular Square Round Button colour A3CJ–500R A3CJ–500Y A3CJ–500GY A3CJ–500W A3CA–500R A3CA–500Y A3CA–500GY A3CA–500W A3CT–500R A3CT–500Y A3CT–500GY A3CT–500W 1. With the exception of green, all screens can be used with either LED or incandescent lamps. Since the hue of green changes with an incandescent light source, use the green LED light source listed elsewhere. Red Yellow Green White Blue A3CJ–500R A3CJ–500Y A3CJ–500G A3CJ–500W A3CJ–500A A3CA–500R A3CA–500Y A3CA–500G A3CA–500W A3CA–500A A3CT–500R A3CT–500Y A3CT–500G A3CT–500W A3CT–500A Illumination Source LED 5VDC Rated voltage Colour Red Yellow Green White A3B–005R A3B–005Y A3B–005G A3B–005W 12VDC 24VDC A3B–012R A3B–012Y A3B–012G A3B–012W A3B–024R A3B–024Y A3B–024G A3B–024W Incandescent lamp 6VDC Rated voltage All Colours Model 18VDC 14VDC A3B–006 A3B–014 A3B–018 28VDC A3B–028 Switch Unit Degree of protection Appearance Configuration General p purpose p Micro-load Contact SPST–NO+ SPST–NC Switch action Momentary Alternate Momentary y Alternate Indicator Terminal Solder Solder PCB Solder PCB Solder PCB IP40 Rectangular A3CJ–7011 A3CJ–7021 A3CJ–7111 A3CJ–7112 A3CJ–7121 A3CJ–7122 M2CJ–7001 M2CJ–7002 Square A3CA–7011 A3CA–7021 A3CA–7111 A3CA–7112 A3CA–7121 A3CA–7122 M2CA–7001 M2CA–7002 Round A3CT–7011 A3CT–7021 A3CT–7111 A3CT–7112 A3CT–7121 A3CT–7122 M2CT–7001 M2CT–7002 Specifications Applicable load range Type General purpose load AC resistive load 0.5A, 250VAC 1A, 125VAC DC resistive load 1A, 30VDC Micro* current/voltage load 0.1A, 125VAC 0.1A, 30VDC Note: * The minimum permissible load is 1mA, 5VDC. LED Ratings Rated voltage 5 VDC 12 VDC 24 VDC Rated current 30mA 15mA 10mA Operating voltage 5VDC 5% 12VDC 5% 24VDC 5% Rated current 60mA 40mA 26mA 24mA Operating voltage 5V 12V 15V 24V Voltage (VDC) Contact Ratings Lamp Ratings Rated voltage 6V 14V 18V 28V Current (mA) Note: The load range shown above is applicable only during the standard conditions. Characteristics Operating frequency Mechanical Momentary-action type: 120 operations per minute max. Alternate-action type: 60 operations per minute max. Electrical 20 operations/minute max. Insulation resistance 100MΩ min. (at 500VDC) Dielectric strength 1,000VAC, 50/60Hz for 1 minute between terminals of same polarity 2,000VAC, 50/60Hz for 1 minute between terminals of different polarity and also between each terminal and ground Vibration Malfunction 10 to 55Hz, 1.5mm double amplitude Shock Durability Approx. 500m/s2 (50G) Malfunction Approx. 150m/s2 (15G) Ambient temperature Operating: –10_C to 55_C Humidity 35 to 85% RH Life expectancy Mechanical Momentary-action type: 1,000,000 operations min. Alternate-action type: 100,000 operations min. Life expectancy Electrical 100,000 operations min. Weight Approx. 5g Operating Characteristics OF max. 250g RF min. 30g TT 3.50.5mm LTA min. 0.5mm PT max. 2.5mm Approved by Standards UL (File No.E41515) CSA (File No. LR45258–31) Dimensions Rectangular A3CJ Panel cutout Note: Square A3CA Recommended panel thickness is 1.0 to 3.2mm. Panel cutout Note: Recommended panel thickness is 1.0 to 3.2mm. Round A3CT Panel cutout Note: Legend plate A3CJ Note: 1 A3CA Recommended panel thickness is 1.0 to 3.2mm. A3CT The thickness is 0.8mm 2. Since the legend plate is made of polycarbonate, use alcohol-based paints such as melanin, phthalic acid or acryl paint when marking the legend. Terminals/Connections Type Terminal SPST–NO+SPST–NC For Indication Lighted type Indicator Solder Terminal Lamp terminal 0.3t Lamp terminal 0.3t Terminal hole Terminal hole (Bottom view) (Bottom view) Lighted type Indicator Lamp terminal 0.3t PCB Terminal Lamp terminal 0.3t Mounting hole (Bottom view) Mounting hole (Bottom view) (Bottom view) (Bottom view) Accessories (Order Separately) Name Shape Classification Model Remarks Wire-wrap terminal A3C–4101 – PCB terminal A3C–4102 Solder terminal A3C–4103 Switch guard Rectangular A3CJ–5050 – Tightening tool – A3C–3004 Useful for mounting switch units one after another. Do not over-tighten. Socket Assembly/Disassembly Mounting and Replacing Pushbutton Unit Mounting directions for the LED/lamp and Screen The OMRON screen doubles the roles in which a pushbutton switch is normally used. The screen may be inserted one of two ways: 1. For operation as a lighted pushbutton switch, fit the LED/lamp so that its guide projection is inserted into the wider opening in the receptacle of the screen. Projection Removing the pushbutton unit While holding the recessed portions on both sides, firmly and steadily pull out the top of the screen with your thumb and forefinger. Pulling out the cap with pliers or a similar tool will damage the cap. Recess LED/lamp guide Mounting the switch unit on panel Nut mounting • Insert the switch unit from the front of the panel and tighten the mounting nut inserted from the rear of the panel. LED/lamp guide • • • Since a projection exists on the rear portion of the switch unit, if the mounting unit cannot be fitted into position, turn the nut slightly. The tightening torque of the mounting nut should be less than 5kg–cm. Solder the terminals after mounting the nut. Otherwise, the terminals, when thickened by solder, may prevent the nut from being screwed down onto the switch unit. 2. For operation as an indicator unit, insert the LED/lamp guide projection into the narrower opening in the indicator unit’s receptacle. Push the projection of the LED/lamp in the groove of the screen so that the LED/lamp is firmly inserted into the screen of the indicator unit. LED/lamp guide Wiring • Finish soldering within 5 seconds with a 30 watt soldering iron, or within 3 seconds at a solder temperature of 240_C. Do not apply any force to the switch unit for about a minute after soldering, to avoid deforming the softened plastic base of the switch unit. Groove of the indicator unit • Projection of the LED/lamp Note: The inserting direction of the LED/lamp for the screen is opposite to that for the indicator unit. Pay attention to the mounting direction of the legend plate. Use a non-corrosive, resin-based soldering flux. Construction Lens Legend plate Reflection plunger LED/lamp Switch unit Nut Screen