A3A Lighted Pushbutton Switch Compact High-capacity Push-button Switch ●Ideal for use as a high breaking capacity Power Switch. ●Switches from micro load (minimum applicable load: 5 VDC 1mA) to high capacity load. RoHS Compliant A Refer to Safety Precautions for All Pushbutton Switches and 3 Safety Precautions on page 8. A List of Models ●Non-lighted Push-button Switches ●Lighted Push-button Switches Appearance Model Illumination Appearance Model A3AA-9@ A3AA-9@ Square Square @1-00@ @1-00E@ LED surface illumination A3AT-9@ A3AT-9@ Round Round @1-00@ @1-00E@ Model Number Structure The model numbers used to order sets of Units are illustrated below. ■Model Number Legend (Ordering as a Set)...... One set comprises the Pushbutton (LED lamp built-in) and Switch. For information on combinations, refer to Ordering Information. (1) (2) (3) (4) (5) A3A A -9 0K 1- 00E R (1) Shape of Pushbutton (5) Color Symbol Shape 1. Pushbutton A Square (Non-lighted Models) T Round Symbol Color L Light gray (2) Terminal RRed* Symbol Type Y Yellow* 0 Solder G Green* 1PCB ABlue BBlack DDark gray (3) Switch Specifications HGray Symbol Operation Contact type 2. LED (Surface A Momentary (4) Illumination 3 A at 125 VAC, SPDT Illumination Models) ( ) 2 A at 30 VDC B Alternate Symbol Operation Symbol Color 6 A at 125 VAC, K Momentary 00 Non-lighted RRed SPST-NO 2 A at 250 VAC, ( ) 00E Surface illumination L Alternate 4 A at 30 VDC Y Yellow GGreen * Common to both lighted and non-lighted models. ■Specifications: Refer to page 3. ■Dimensions: Refer to page 5. ■Accessories: Refer to page 2. 1 A3A Lighted Pushbutton Switch List of Models SPST-NO Color symbol for Minimum Appearance Terminal Operation Illumination Model pushbutton packing unit Square/A3AA Non-lighted A3AA-90K1-00@ Momentary LED surface illumination A3AA-90K1-00E@ Solder Non-lighted A3AA-90L1-00@ Alternate LED surface illumination A3AA-90L1-00E@ (Non-lighted) Non-lighted A3AA-91K1-00@ R (red) Momentary Y (yellow) LED surface illumination A3AA-91K1-00E@ PCB G (green) Non-lighted A3AA-91L1-00@ L (light gray) Alternate A (blue) LED surface illumination A3AA-91L1-00E@ B (black) 100 Round/A3AT Non-lighted A3AT-90K1-00@ D (dark gray) A Momentary H (gray) LED surface illumination A3AT-90K1-00E@ 3 (Surface illumination) Solder A Non-lighted A3AT-90L1-00@ R (red) Alternate Y (yellow) LED surface illumination A3AT-90L1-00E@ G (green) Non-lighted A3AT-91K1-00@ Momentary LED surface illumination A3AT-91K1-00E@ PCB Non-lighted A3AT-91L1-00@ Alternate LED surface illumination A3AT-91L1-00E@ Note: The above models each have a SPST-NO contact that can switch 6 A at 125 VAC, 2 A at 250 VAC, and 4 A at 30 VDC. When ordering any of the above models, replace @ of the model number with a code to indicate the pushbutton color of the model (i.e., replace @ with R, Y, G, L, A, B, D, H, and L). The pushbutton of an A3A does not illuminate if the color of the pushbutton is dark gray, gray, light gray, blue, or black. SPDT Color symbol for Minimum Appearance Terminal Operation Illumination Model pushbutton packing unit Square/A3AA Non-lighted A3AA-90A1-00@ Momentary LED surface illumination A3AA-90A1-00E@ Solder Non-lighted A3AA-90B1-00@ Alternate LED surface illumination A3AA-90B1-00E@ (Non-lighted) Non-lighted A3AA-91A1-00@ R (red) Momentary Y (yellow) LED surface illumination A3AA-91A1-00E@ PCB G (green) Non-lighted A3AA-91B1-00@ L (light gray) Alternate A (blue) LED surface illumination A3AA-91B1-00E@ B (black) 100 Round/A3AT Non-lighted A3AT-90A1-00@ D (dark gray) Momentary H (gray) LED surface illumination A3AT-90A1-00E@ (Surface illumination) Solder Non-lighted A3AT-90B1-00@ R (red) Alternate Y (yellow) LED surface illumination A3AT-90B1-00E@ G (green) Non-lighted A3AT-91A1-00@ Momentary LED surface illumination A3AT-91A1-00E@ PCB Non-lighted A3AT-91B1-00@ Alternate LED surface illumination A3AT-91B1-00E@ ■Accessories Flange (Select according to panel color.) Minimum Name Shape Classification Model packing unit Black A3A-241 Square @12.7 Light gray A3A-242 Flange alone Black A3A-251 Round φ12.7 Light gray A3A-252 Flange Leaf spring A3A-200 100 Black A3A-211 Square @12.7 Flange and leaf Light gray A3A-212 spring Black A3A-221 Round (one each) φ12.7 Light gray A3A-222 Note: An A3A with solder terminals is provided with a round or square black flange and leaf spring. A round black flange is provided with each A3A having solder terminals and a round pushbutton. A square black flange is provided with each A3A having solder terminals and a square pushbutton. 2 A3A Lighted Pushbutton Switch Specifications ■Approved Standards ■Characteristics Momentary action: 120 operations/minute max. • SPST-NO SPDT Mechanical Operating Alternate action: 60 operations/minute max. *1 6 A at 125 VAC 3 A at 125 VAC frequency UL Electrical 20 operations/minute max. 2 A at 250 VAC 2 A at 30 VDC CSA Insulation resistance 100 MΩ min. (at 500 VDC) 4 A at 30 VDC Contact resistance 100 mΩ max. (initial value) Between ■Ratings terminals of 600 VAC, 50/60 Hz for 1 min same polarity Dielectric Item AC resistive load DC resistive load strength Between Type Contact form each terminal 2,000 VAC, 50/60 Hz for 1 min 6 A at 125 VAC and ground General load SPST-NO 4 A at 30 VDC 2 A at 250 VAC Vibration Malfunction 10 to 55 Hz, 1.5-mm double amplitude *2 Note: Minimum allowable load: 5 VDC 1 mA (Resistive) resistance A The ratings given above are for testing under the following conditions: 2 3 Destruction 500 m/s (1) Ambient temperature: 20 ±2°C Shock A (2) Ambient humidity: 65 ±5% resistance 2 Malfunction 150 m/s *2 (3) Operating frequency: 20 times/minute Momentary action: 1,000,000 operations min. Mechanical LED Alternate action: 50,000 operations min. *1 Durability Illumination Surface illumination Electrical 50,000 operations min. Item Red Yellow Green Weight Approx. 3.2 g Standard value (V) * Ambient operating 2.0 2.1 2.1 −10°C to +55°C (with no icing) (IF = 10 mA) temperature Forward voltage VF Maximum value (V) 3.0 Ambient operating humidity 35% to 85% Forward current IF Maximum value (mA) 20 20 25 Ambient storage −25°C to +65°C (with no icing) temperature Permissible loss PD Maximum value (mW) 60 60 75 Degree of protection IP00 Reverse voltage VR Maximum value (V) 3 Electric shock protection Note: The above built-in LEDs do not have a resistor. Connect to each of the Class II class above built-in LEDs a resistor that satisfies the above conditions. * Refer to the VF – IF characteristic graphs on page 8. PTI (proof tracking index) 175 Pollution degree 3 (IEC947-5-1) ■Operating Characteristics *1. With alternate operation models, one operation cycle consists of set and reset operations. Operating force OF max. 2.45 N *2. Indicates malfunctions of less than 1 ms. Release force RF min. 0.15 N ■Contact Form Total travel TT Approx. 2mm Contact name Contact form Contact type Pretravel PT max. 1.5 mm Double-break SPST-NO Locktravel alternate * LTA min. 0.5 mm NO NO * Alternate operation models only. NC Double-throw SPDT COM NO 3 A3A Lighted Pushbutton Switch Nomenclature ■Model Structure 1. Shape Square 4.Color cap Round (A3AA) (A3AT) Diffusion sheet (milky white) 5. Color Non-lighted Model A Red , yellow , light gray , 3 gray , dark gray , A Flange green , blue , black Surface Illumination Model Red , yellow , green 3. Ratings Leaf spring Standard load 6 A at 125 VAC 2 A at 250 VAC 4 A at 30 VDC * Minimum applicable load: 1 mA at 5 VDC (resistive load) 2. Terminals Solder terminal PCB termin al Note 1. The above is for the A3AA. 2.An A3A with solder terminals is provided with a black flange and leaf spring, however an A3A with PCB terminals is not provided with them. If a black flange and leaf spring are required for an A3A with PCB terminals, order them from your OMRON representative. (Refer to page 2.) 4 A3A Lighted Pushbutton Switch Dimensions (Unit: mm) Non-lighted Model Square Pushbutton SPST-NO SPDT Square push-button @8.9 1.7 1.7 1 3.5 1 12.5 3.5 12.5 18 Round Pushbutton 18 Round push-button 15.2 Three, t0.4 terminals Two, t0.4 12.7 A terminals 3 A 8.9 dia. Surface Illumination Model Square Pushbutton SPST-NO SPDT Square push-button @8.9 1.7 1.7 1 3.5 1 12.5 3.5 12.5 18 Round Pushbutton 18 Round push-button Three, t0.4 terminals 15.2 Two, t0.4 terminals 12.7 8.9 dia. Two, t0.3 LED terminals Two, t0.3 LED terminals Note: All units are in millimeters unless otherwise indicated. The illustrations below show switches with solder terminals, without a flange or leaf spring. Unless specified, there is a tolerance of ±0.4mm for dimensions. 5 A3A Lighted Pushbutton Switch ■Terminals Contact Solder terminal PCB terminal Non-lighted Models Non-lighted Models Lighted Models Terminal Hole Switch terminal: t0.4 1 Dimensions 1 1 2 3.5 3.5 3.5 1.7 0.8 0.5 0.6 0.6 Lighted Models 1.7 1.7 Switch terminal: t0.4 1 Lamp terminal: t0.3 Switch terminal: t0.4 Switch terminal: t0.4 Lamp terminal: t0.3 2 3.5 Terminal Arrangement PCB Dimensions SPST-NO (BOTTOM VIEW) (BOTTOM VIEW) 0.8 0.5 1.7 0.8 × 2 Holes for models Terminal for models with illuminating with an illuminating Four, LED push-button Terminal for models push-button 1 dia. terminal A with an illuminating holes LED 3 push-button terminal 㧗㧙 A (0.67) 10.16 10.16 4.48 4.48 10.16 4.48 NO NO (1.87) 10.16 10.16 NO NO (2.52) (2.52) 10.16 Terminal Hole Non-lighted Models Lighted Models Non-lighted Models Dimensions Switch terminal: t0.4 2 3.5 3.5 1 0.8 0.5 0.6 0.6 0.8 3.5 1.7 1.7 1.7 Switch terminal: t0.4 Switch terminal: t0.4 Lighted Models LED terminal: t0.3 Switch terminal: t0.4 Lamp terminal: t0.3 Terminal Arrangement PCB Dimensions (BOTTOM VIEW) (BOTTOM VIEW) Five, LED 1 Holes for models 1-dia. terminal with illuminating holes SPDT 2 push-button L+ L- 0.8 0.5 5.7 0.8 3.5 5.7 1.7 NC NO C LED 1.95 1.95 terminal NC C 10.16 L+ L- (2.54) 10.16 5.7 NO NC NO C 1.95 10.16 6 A3A Lighted Pushbutton Switch ■Accessories Dimensions Leaf Spring A3A-200 Flange (Square) A3A-24@ Flange (Round) A3A-25@ 15 12.7 12.7 dia. 13 9.1 9.1 dia. 12.2 1 1 t = 0.3 2.5 7.8 7.8 1.0 1.0 (10.1) (10.1) 5.4 5.4 11.6 11.6 Note: Unless otherwise specified, a tolerance of ±0.4 mm applies to all dimensions. A 3 A ■Panel Cutouts Square Pushbutton For Side-by-side Mounting Panel Mounting Dimensions Square pushbutton Round pushbutton +0.2 11.5 0 +0.2 Flange 15.3 min. 11.5 dia. −0 Panel * Horizontal +0.2 1 +0.2 11.5 11.5 −0 multiple 0 mounting +0.2 11.5 15.3 min. −0 Leaf spring Round Pushbutton 3.8 min. 14.5 max. +0.2 11.5 dia. 0 +0.2 11.5 dia. −0 +0.2 * Recommended panel 11.5 −0 Vertical thickness: 1 to 1.6 mm multiple mounting 12.7 min. +0.3 12.7(n−1)+11.5 −0 (The diagram shows the lighted SPST-NO model.) 7 A3A Lighted Pushbutton Switch Precautions ●Refer to the “Push-button Switches Common Precautions” for correct use. Precautions for Correct Use Note: Make sure that the limiting resistor Please do not perform wiring or touch ● Pushbutton connected to the built-in LED of an A3A the charged parts of terminals while When exchanging the Pushbutton satisfies the characteristics of the built-in power is supplied to the Switch.Doing (except the ones for the mechanical LED. The mean forward current of the so may result in electric shock. built-in LED must be 8 mA minimum. indicator models) with a new one, pull Make sure to keep a secure insulation out the Pushbutton from the Switch, ● Example distance after wiring to the Switch. holding the Pushbutton in the Conditions: Red LED with an IF of longitudinal direction. ● Mounting –10 mA at 24 V and a Ta of 25°C. Do not remove the Pushbutton of the From the red LED characteristic below, When opening a hole on a panel to mechanical indicator model. VF will be 2 V when IF is 10 mA. mount an A3A to the panel, make sure Therefore, R = (24 V – 2 V)/0.01 A = A that the hole has no burr. ● Engraving of Pushbutton 3 2,200 Ω.When mounting a flange to the Depth of engraving: 0.3 mm max. for A Thus the recommended resistance is switching mechanism of an A3A, illuminating pushbutton 2 2.2 kΩ at 0.5 W (2* x IF R). make sure that the flange and the Since the Pushbutton is made of Note: A factor of 2 (marked with an asterisk) is casing of the switching mechanism polycarbonate, use an alcohol-based applied because the permissible wattage of are engaged securely. paint when marking legend. the resistor must be twice as large as the required wattage. ● Wiring ● Pressing of Pushbutton LED Characteristics When soldering the terminals of an Apply firm pressure to the Pushbutton A3A, refer to the following. (VF – IF Characteristics) when operating it. In doing so, 1. For manual soldering: Ta: Ambient Temperature however, do not apply a pressure Use a soldering iron with the greater than 11.8 N. (Red) terminals at a temperature of 350°C IF 50 Ta = 25°C (mA) maximum within three seconds. 20 2. Do not impose any external force on 10 the terminals for one minute after 5.0 the terminals are soldered. 2.0 Do not pull the terminals of any A3A 1.0 with a force exceeding 5.34 N, 0.5 otherwise the joint part of the A3A may 0.2 be damaged. 0.1 When soldering the terminals of an 1.0 1.5 2.0 2.5 3.0 VF (V) A3A, apply non-corrosive rosin flux to the terminals. (Yellow) IF 50After soldering the terminals of an Ta = 25°C (mA) A3A, do not wash the A3A with any 20 10 solvent. 5.0When mounting an A3A to a PCB and soldering the terminals of the A3A to 2.0 the PCB, make sure that the flux will 1.0 not rise above the surface of the PCB. 0.5 0.2 ● Operating Environment 0.1 When using an A3A, make sure that 1.0 1.5 2.0 2.5 3.0 dust, metal powder, or oil will not VF (V) penetrate into the interior of the A3A. (Green) IF 50 Ta = 25°C ● LED (mA) 20 The polarity of the LED is indicated on 10 the back of the Switch. Wire the LED 5.0 correctly according to the polarity. 2.0 An A3A with a built-in LED does not 1.0 have a limiting resistor. Connect a 0.5 limiting resistor. 0.2The resistance can be calculated by 0.1 using the following expression. 1.0 1.5 2.0 2.5 3.0 VF (V) E : Applied E−VF voltage (V) R = (Ω) IF VF : LED forward voltage (V) IF : LED forward current (A) 8 A3A Lighted Pushbutton Switch ■Installation ● Mounting and Replacing the Pushbutton 1. Mounting Direction for the 2. Removing the Pushbutton (Non-lighted Models Only) Pushbutton and Switch Insert the catches of the Pushbutton into the To remove the Pushbutton, hold both the When replacing the Pushbutton, if the cap is held grooves of the Switch and push down on the Pushbutton and the Switch on the longer on the sides with catches, internal components Pushbutton until it is fixed securely to the sides and pull the Pushbutton away from the (e.g., plate) may come loose. Be sure to hold the Switch. Switch. Pushbutton by the sides without catches (i.e., the With lighted models, the LED is built into the (If the catches on the Pushbutton are bent longer sides of the Switch) when removing. Switch and cannot be replaced. outwards, it may result in malfunction.) A 3 A Catches on the Pushbutton Grooves in the Switch Catch LED terminals ● Mounting Switch on a Panel 1. Mount Leaf Spring 2. Mount Flange on Panel 3. Fit Flange with Switch 4. Removing Switch Press the leaf spring into the fitted Insert the flange from the front While holding the flange, insert the Insert a small flat-bladed screwdriver groove on the upper surface of the surface of the panel. opposing supports into the gaps or tweezers into the flange support Switch. For an easier fitting, first fit between the leaf spring and exposed on the rear of the panel. Flange one side of the leaf spring, then Switch on the longer sides of the Pry up on each side to pull out the press the other side into the fitting Panel housing, and fit the rectangular Switch. Guide groove. hole of the flange with the (It will be easier mounting the leaf projections of the switch housing. Flat-bladed Panel spring of one side first, then mount screwdriver the other side.) or tweezers The flange has two opposing guides to facilitate its insertion into the panel cutout hole. Be sure the flange does not remain tilted with Support respect to the panel surface after Leaf spring being installed. Leaf spring Cross Section fitting groove Flange Panel Switch Panel Projection (t = 1 to 1.6 mm) Note: Be sure to fit the leaf spring Note: Completely remove any burrs on Note: Do not pry up the flange support exactly into the groove, and do Note: The mounting direction of the the panel cutout surface; more than necessary or the flange determines the orientation not allow it to slip out of the otherwise, the flange and Switch switch holding portions may be groove. of the Switch. will not attach solidly. damaged. 9 A3A Lighted Pushbutton Switch A 3 A • Application examples provided in this document are for reference only. In actual applications, confirm equipment functions and safety before using the product. • Consult your OMRON representative before using the product under conditions which are not described in the manual or applying the product to nuclear control systems, railroad systems, aviation systems, vehicles, combustion systems, medical equipment, amusement machines, safety equipment, and other systems or equipment that may have a serious influence on lives and property if used improperly. Make sure that the ratings and performance characteristics of the product provide a margin of safety for the system or equipment, and be sure to provide the system or equipment with double safety mechanisms. Note: Do not use this document to operate the Unit. OMRON Corporation Electronic and Mechanical Components Company Contact: www.omron.com/ecb Cat. No. A025-E1-05 0812(0207)(O) 10