Indicator M2C Indicator with Cylindrical 20-mm × 12-dia. Body Same basic design as the A3C Pushbutton Switch. Good illumination with even surface brightness. Cylindrical body means panel cutouts can be made easily. UL (E41515) and CSA (LR45258) approved. RC Ordering Information Model Number Legend: The model numbers used to order sets of Units are illustrated below. One set comprises the Display, Lamp, and Socket Unit. (1) (2) (3) (4) (5) M 2 C J - 9 0 A 1 - 24E R (1) Shape of Display Symbol J A T Shape Rectangular Square Round (2) Terminal Type (3) Lighting Type (4) Lighting Method (5) Color of Display LED lamp-lighted Models Symbol Terminal type Symbol Lighting type 0 Solder terminals 1 Illumination only Colored-illumination models are also available. For details, refer to page 49. “Colored-illumination” models operate in the way shown below: Unlit White Symbol 05E Operating voltage 5 VDC 12E 12 VDC 24E 24 VDC Incandescent Lamplighted Models Symbol Operating voltage For LED lamp Symbol Color R Red Y Yellow G Green W White For incandescent lamp Lit 06 5 VAC/VDC Color 14 12 VAC/VDC R Red 28 24 VAC/VDC Y Yellow G Green The built-in LED is colored. Symbol Color A Blue W White 47 M2C M2C List of Models Appearance Model Rectangular M2CJ Square M2CA Round M2CT Ordering as a Set The model numbers used to order sets of Units are given in the following tables. One set comprises the Display, Lamp, and Socket Unit. Rectangular Models Square Models Round Models Indicators (Solder Terminals) Appearance Rectangular g ((M2CJ)) Lighting LED lamp p Model number (for set) M2CJ-90A1-05Ej M2CJ-90A1-12Ej M2CJ-90A1-24Ej Incandescent lamp M2CJ-90A1-06j M2CJ-90A1-14j M2CJ-90A1-28j Square q ((M2CA)) LED lamp p M2CA-90A1-05Ej M2CA-90A1-12Ej M2CA-90A1-24Ej Incandescent lamp M2CA-90A1-06j M2CA-90A1-14j M2CA-90A1-28j Round (M2CT) ( ) LED lamp p M2CT-90A1-05Ej M2CT-90A1-12Ej M2CT-90A1-24Ej Incandescent lamp M2CT-90A1-06j M2CT-90A1-14j M2CT-90A1-28j Note: 48 Enter the desired color symbol for the Display in the j at the end of the model number. Display color symbol R: red Y yellow Y: ello G: green W: white R: red Y: yellow G: green W: white A: blue R: red Y yellow Y: ello G: green W: white R: red Y: yellow G: green W: white A: blue R: red Y yellow Y: ello G: green W: white R: red Y: yellow G: green W: white A: blue M2C M2C Illumination-only and Colored-illumination LED Models “Illumination only” describes LED models for which the screen color is the same whether the LED is lit or not. The screen simply becomes brighter when the LED lights. Example: Red LED Cap (red) Not lit Red Display Legend plate (milky white) Lit Reflective plunger Red LED lamp (red) Lamp “Colored illumination” describes LED models for which the screen color is white when the LED is not lit and changes to the color of the LED lamp when the LED is lit. Example: Red LED White cap (semi-transparent) Not lit White Legend plate (milky white) Display Lit Reflective plunger Red LED lamp (red) Lamp Ordering: With colored-illumination models, order the Display, Lamp, and Socket Unit as shown in the following table. Illuminated color Display Lamp (LED) Red IP40 A3Cj-500W A16-jDR Yellow Enter one of the following symbols in j. J: Rectangular A: Square T: Round A16-jDY Green Enter one of the following symbols in j. 5: 5 VDC 12: 12 VDC 24: 24 VDC Socket Unit Refer to the following information. Order the Socket Unit that is appropriate for the Display. A16-jDG 49 M2C M2C Ordering Individually Displays, Lamps, and Socket Units can be ordered separately. Combinations that are not available as sets can be created using individual Units. Also, store the parts as spares for maintenance and repairs. Display Rectangular Square Round Lamp LED Lamp Incandescent lamp Socket Unit Rectangular 50 Square Round M2C M2C Display (Lighted Models) Incandescent Lamp LED Lamp Button color Rectangular Square Round Button color Rectangular Square Round Red A3CJ-500R A3CA-500R A3CT-500R Red A3CJ-500R A3CA-500R A3CT-500R Yellow A3CJ-500Y A3CA-500Y A3CT-500Y Yellow A3CJ-500Y A3CA-500Y A3CT-500Y Green A3CJ-500GY A3CA-500GY A3CT-500GY Green A3CJ-500G A3CA-500G A3CT-500G White A3CJ-500W A3CA-500W A3CT-500W White A3CJ-500W A3CA-500W A3CT-500W Blue A3CJ-500A A3CA-500A A3CT-500A Note: The red, yellow, and white Displays listed above can be used with either LED lamp-lighted models or incandescent lamp-lighted models. Lamp LED Lamp Incandescent Lamp Rated voltage Color 5 VDC Rated voltage 12 VDC 24 VDC Model 6 VAC/VDC A16-5 Red A16-5DR A16-12DR A16-24DR 14 VAC/VDC A16-12 Yellow A16-5DY A16-12DY A16-24DY 28 VAC/VDC A16-24 Green A16-5DG A16-12DG A16-24DG White A16-5DW A16-12DW A16-24DW Socket Unit Sealing IP40 Appearance Terminal Solder terminals M2CJ-7001 M2CA-7001 M2CT-7001 Accessories The accessories for the A3C Lighted Pushbutton Switch can also be used with the M2C. Refer to page 38. Specifications Ratings LED Lamp Rated voltage Incandescent Lamp Rated current Operating voltage Internal limiting resistance 5 VDC 30 mA 5 VDC ±5% 33 Ω 12 VDC 15 mA 12 VDC ±5% 270 Ω 24 VDC 10 mA 24 VDC ±5% 1,600 Ω Rated voltage Rated current Operating voltage 6 VAC/VDC 60 mA 5 VAC/VDC 14 VAC/VDC 40 mA 12 VAC/VDC 28 VAC/VDC 24 mA 24 VAC/VDC Characteristics Ambient operating temperature –10_C to 55_C (with no icing or condensation) Ambient operating humidity 35% to 85% Ambient storage temperature –25_C to 65_C Approved Standards UL, CSA 51 M2C M2C Nomenclature Color cap Legend plate (milky white) Reflective plunger Display Color of Display Shape of Display • LED Lamp-lighted Models: Red, yellow, green, white • Incandescent Lamp-lighted Models: Red, yellow, green, white, blue Rectangular (M2CJ) Round (M2CT) Square (M2CA) Lamp LED Lamp Incandescent Lamp Socket Unit Note: 52 The M2CJ model is shown here as a representative example. M2C M2C Dimensions Note: All units are in millimeters unless otherwise indicated. Rectangular Models (M2CJ) Square Models (M2CA) Round Models (M2CT) 14 dia.11.8 dia. Note: Unless specified, there is a tolerance of ±0.4 mm for dimensions. Operation Panel Cutout (Top View) Accessories used Rectangular/M2CJ Indicator Unit only 12 dia.+0.2 0 19 min. Square/M2CA, Round/M2CT 2 dia. (Lock hole) 12 dia.+0.2 0 15 min. 15 min. Note: Note: With Dust Cover Recommended panel thickness: 1.0 to 3.2 mm. Recommended panel thickness: 1.0 to 3.2 mm. 12 dia.+0.2 0 23.5 min. 2 dia. --- 19.5 min. Note: If the panel is to be finished (e.g., coated), make sure that the panel meets the specified dimensions after the coating. Terminal Connections Type Terminal SPST-NO+SPST-NC Solder terminal Lighted and non-lighted models Terminal Hole Dimensions Terminal Arrangement (bottom view) Lamp terminal (t0.3) 53 M2C M2C Precautions Correct Use Refer to the Common Precautions for Pushbutton Switches on page 14. Refer to Correct Use for A3C on page 46. ALL DIMENSIONS SHOWN ARE IN MILLIMETERS. To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527. Cat. No. A123-E1-02 54 A3C A3C Accessories (Order Separately) Name Appearance Classification Socket Model Remarks Cannot be used with Insulation Cover. Wire-wrap terminal A3C-4101 PCB terminal A3C-4102 Solder terminal A3C-4103 Insulation Cover --- A3C-3002 Cannot be used with Socket. Switch Guard For rectangular models A3CJ-5050 Cannot be used with Dust Cover. For square, round models A3CA-5050 Dust Cover For rectangular models A3CJ-5060 Cannot be used with Switch Guard. Tightening Tool --- A3C-3004 The tightening torque is 0.20 to 0.39 N⋅m. Extractor --- A3PJ-5080 --- Legend Plate For rectangular models A3CJ-5201 One Legend Plate is supplied per standard Switch. For square models A3CA-5201 For round models A3CT-5201 Specifications Contact Ratings Item Model Standard load Microload (See note 1.) Note: 38 LED Lamp Ratings AC resistive load DC resistive load 0.5 A at 250 VAC 1 A at 125 VAC 1 A at 30 VDC 0.1 A at 125 VAC 0.1 A at 30 VDC 1. The minimum permissible load is 1 mA, 5 VDC. 2. The above ratings are for testing under the following conditions: 1) Load: Resistive load 2) Mounting conditions: No vibrations or shock 3) Temperature: 20°C ± 2°C 4) Operation frequency: 20 operations/minute Rated voltage Rated current Operating voltage Internal limiting resistance 5 VDC 30 mA 5 VDC±5% 33 Ω 12 VDC 15 mA 12 VDC±5% 270 Ω 24 VDC 10 mA 24 VDC±5% 1,600 Ω Incandescent Lamp Ratings Rated voltage Rated current Operating voltage 6 VAC/VDC 60 mA 5 VAC/VDC 14 VAC/VDC 40 mA 12 VAC/VDC 28 VAC/VDC 24 mA 24 VAC/VDC Technical Information Technical Information Common Precautions For the individual precautions for a Switch, refer to the precautions in the section for that Switch. Type of Load vs. Inrush Current Cautions Do not perform wiring or touch the charged parts of terminals while power is being supplied to the Switch. Doing so may result in electric shock. Solenoid (Approximately 10 to 20 times higher) Electrical Characteristics Incandescent lamp (Approximately 10 to 15 times higher) Electrical Conditions • The switching load capacity of the Switch greatly varies between AC and DC. Always be sure to apply the rated load. The control capacity will drastically drop if it is a DC load. This is because a DC load has no current zero-cross point, unlike an AC load. Therefore, if an arc is generated, it may continue for a comparatively long time. Furthermore, the current direction is always the same, which results in a contact relocation phenomena whereby the contacts easily stick to each other and do not separate when the surfaces of the contacts are uneven. • Some types of load have a great difference between normal current and inrush current. Make sure that the inrush current is within the permissible value. The greater the inrush current in the closed circuit is, the greater the contact abrasion or shift will be. Consequently, contact weld, contact separation failures, or insulation failures may result. Furthermore, the Switch may be broken or damaged. • If the load is inductive, counter-electromotive voltage will be generated. The higher the voltage is, the higher the generated energy will be, which will increase the abrasion of the contacts and contact relocation phenomena. Be sure to use the Switch within the rated conditions. Motor (Approximately 5 to 10 times Relay higher) (Approximately 4 to 5 times higher) • All the performance ratings given are for operation under the following conditions unless otherwise specified. Inductive load: A minimum power factor of 0.4 (AC) and a maximum time constant of 7 ms (DC) Lamp load: An inrush current 10 times higher than the steady-state current Motor load: An inrush current 6 times higher than the steady-state current Note: Inductive loads can cause problems especially in DC circuitry. Therefore, it is essential to know the time constants (L/R) of the load. Load Connections Inrush Current Do not contact a single Switch to two power supplies that are different in polarity or type. Connection of Different Polarities The power supply may short-circuit if the loads are connected in the way shown in the “incorrect” example below. i (Inrush current) Incorrect Load Load o (Steadystate current) Correct Load • Approximate control capacities are given in ratings tables, but these alone are insufficient to guarantee correct operation. For special types of load, with unusual switching voltage or current waveforms, test whether correct operation is possible with the actual load before application. • When switching for microloads (voltage or current), use a Switch with microload specifications. The reliability of silver-plated contacts, which are used in Switches for standard loads, will be insufficient for microloads. • When switching microloads or very high loads that are beyond the switching capacity of the Switch, connect a relay suitable for the load. 14 Load Even in the “correct” example, note that the insulation performance of the switch may deteriorate and the switch life may be shortened because loads are connected to both contacts. Technical Information Technical Information Connection of Different Power Supplies The DC and AC power may be mixed for the circuit shown below. Do not design a circuit where voltage is imposed between contacts, otherwise contact weld may result. Incorrect Incorrect Load Load Load Contact Protective Circuit Apply a contact protective circuit to extend the contact life, prevent noise, and suppress the generation of carbide or nitric acid. Be sure to apply the contact protective circuit correctly, otherwise an adverse effect may occur. The following provides typical examples of contact protective circuits. If the Limit Switch is used in an excessively humid location for switching a load that easily generates arcs, such as an inductive load, the arcs may generate NOx, which will change into HNO3 if it reacts with moisture. Consequently, the internal metal parts may corrode and the Limit Switch may fail. Be sure to select the ideal contact preventive circuit from the following. Typical Examples of Contact Protective Circuits Applicable current Circuit example AC CR circuit Power supply DC *When AC is switched, the load impedance must be lower than the CR impedance. Yes Yes The operating time will be greater if the load is a relay or solenoid. Connecting the CR circuit in parallel to the load is effective when the power supply voltage is 24 or 48 V and in parallel to the contacts when the power supply voltage is 100 to 200 V. No Yes Energy stored in the coil is changed into current by the diode connected in parallel to the load. Then the current flowing to the coil is consumed and Joule heat is generated by the resistance of the inductive load. The reset time delay with this method is longer than that in the CR method. The diode must withstand a peak inverse voltage 10 times higher than the circuit voltage and a forward current as high or higher than the load current. No Yes This method will be effective if the reset time delay caused by the diode method is too long. Use a Zener diode with a Zener voltage that is approximately 1.2 × power supply voltage as, depending on the environment, the load may not operate. Yes Yes This method makes use of constant-voltage characteristic of the varistor so that no high-voltage is imposed on the contacts. This method causes a reset time delay. Connecting a varistor in parallel to the load is effective when the supply voltage is 24 to 48 V and in parallel to the contacts when the supply voltage is 100 to 200 V. --- Inductive load Diode and Zener diode method Power supply Inductive load Inductive load Varistor method Inductive load Power supply C: 1 to 0.5 µF x switching current (A) R: 0.5 to 1 Ω x switching voltage (V) The values may change according to the characteristics of the load. The capacitor suppresses the spark discharge of current when the contacts are open. The resistor limits the inrush current when the contacts are closed again. Consider the roles of the capacitor and resistor and determine ideal capacitance and resistance values through testing. Basically, use a capacitor with a dielectric strength between 200 and 300 V. When AC is switched, make sure that the capacitor has no polarity. Yes Power supply Power supply Element selection * Inductive load Diode method Feature 15 Technical Information Technical Information Do not apply contact protective circuits as shown below. Incorrect Power supply Load Incorrect This circuit effectively suppresses arcs when the contacts are OFF. The capacitor will be charged, however, when the contacts are OFF. Consequently, when the contacts are ON again, short-circuited current from the capacitance may cause contact weld. Hammer Do not apply excessive or sudden force. Incorrect Power supply Load This circuit effectively suppresses arcs when the contacts are OFF. When the contacts are ON again, however, charge current will flow to the capacitor, which may result in contact weld. • The pushbutton surface is composed of resin. Therefore, do not attempt to operate the pushbutton using a sharp object, such as a screwdriver or a pair of tweezers. Doing so may damage or deform the pushbutton surface and result in faulty operation. Switching a DC inductive load is usually more difficult than switching a resistive load. By using an appropriate contact protective circuit, however, switching a DC inductive load will be as easy as switching a resistive load. Incorrect Do not use sharp objects. Switching • Do not use the Switch for loads that exceed the rated switching Screwdriver capacity or other contact ratings. Doing so may result in contact weld, contact separation failures, or insulation failures. Furthermore, the Switch may be broken or damaged. • Do not touch the charged switch terminals while power is supplied, otherwise an electric shock may be received. • The life of the Switch varies greatly with switching conditions. Before using the Switch, be sure to test the Switch under actual conditions. Make sure that the number of switching operations is within the permissible range. If a deteriorated Switch is used continuously, insulation failures, contact weld, contact failures, switch damage, or switch burnout may result. • Do not apply excessive or incorrect voltages to the Switch or incorrectly wire the terminals. Otherwise, the Switch may not function properly and have an adverse effect on external circuitry. Furthermore, the Switch itself may become damaged or burnt. • Do not use the Switch in locations where flammable or explosive gases are present. Otherwise switching arcs or heat radiation may cause a fire or explosion. • Do not drop or disassemble the Switch, otherwise it may not be capable of full performance. Furthermore, it may be broken or burnt. Tweezers Mounting • Switches can be broadly divided into two categories according to mounting method: panel-mounting models and PCB-mounting models. Use the appropriate model for the mounting method required. Basically, panel-mounting Switches can withstand a greater operating force than PCB-mounting Switches. If, however, the panel thickness or the panel-cutout dimensions are not suitable for the Switch, it may not be able to withstand the normal operating force. With continuous mounting in particular, select a panel of a thickness that is easily sufficient to withstand the total operating force. • Panel-mounting Switches can be divided into two categories according to the mounting method: snap-in mounting models and screw-mounting models. Snap-in mounting Switches are held in place with the elasticity of resin or a metal leaf spring. Do not attempt to modify the spring after mounting. Doing so may result in faulty operation or damage the mounting structure. Mount screw-mounting models using the screws and nuts provided (or individually specified). Tighten the screws to the specified torque. Mounting with different screws or nuts, or tightening beyond the specified torque may result in distortion of the inside of the case or damage to the screw section. Mechanical Conditions Operating Force and Operating Method • Fingertip operation is an important feature of Pushbutton Switches. In terms of Switch operation, Pushbutton Switches differ greatly from detection switches such as Microswitches. Operating the Switch using a hard object (e.g., metal), or with a large or sudden force, may deform or damage the Switch, resulting in faulty or rough operation, or shortening of the Switch life. The strength varies with the size and construction of the Switch. Use the appropriate Switch for the application after confirming the operating method and operating force with this catalog. Snap-in Mounting Do not attempt to modify the spring after mounting. • 16 Screw Mounting Use the screws and nuts provided (or specified). Subjecting the Switch to severe vibrations or shock may result in faulty operation or damage. Also, many of the Switches are Technical Information Technical Information composed of resin so contact with sharp objects may result in damage to the surface. This kind of damage may spoil the appearance of the Switch or result in faulty operation. Do not throw or drop the Switch. Correct Incorrect Do not drop or knock the Switch. Incorrect Incorrect Do not drop objects or place heavy objects on the Switch. • Incorrect With miniature Switches, the gap between the terminals is very narrow. Use protective or heat-absorbing tubes to prevent burning of the wire sheath or shorting. Correct Do not operate the Switch with heavy or sharp objects. Hammer Incorrect Screwdriver Mounting Precautions Wiring • Perform wiring so that the lead wires will not be caught on other objects as this will cause stress on the Switch terminals. Wire the Switch so that there is slack in the lead wires and fix lead wires at intermediate points. If the panel to which the Switch is mounted needs to be opened and closed for maintenance purposes, perform wiring so that the opening and closing of the panel will not interfere with the wiring. Protective tube Soldering • There are two methods for soldering the Switch: hand soldering and automatic soldering. In addition, automatic soldering itself can be divided into two types : dip soldering and reflow soldering. Use the soldering method appropriate for the mounting method. The following table gives some examples of applications using the types of soldering given above. 17 Technical Information Technical Information Method Soldering device Hand soldering Automatic soldering Application Case Soldering iron Dip soldering Small quantities Jet soldering bath Reflow soldering Solder Lead wire terminals Lead wire Large quantities of discrete terminals Dip soldering bath Infrared reflow (IR) soldering bath Terminal Different materials • Large quantities of miniature SMD terminals When applying flux using a brush, use a sponge soaked in flux as shown below. Do not apply more than is necessary. Also, apply the flux with the PCB inclined at an angle of less than 80° so that flux does not flow onto the mounting surface of the Switch. Correct Vapor-phase (VPS) reflow soldering bath Brush • Do not use soldering flux that contains chlorine. Doing so may result in metal corrosion. • Perform hand soldering using the appropriate soldering iron. Incorrect 1 mm min. 80°C max. Incorrect Sponge soaked in flux Incorrect Brush Terminal Correct Largecapacity Lead wire soldering iron Small-capacity soldering iron used for a long time Flux • Perform soldering for between 3 to 5 s with a suitable soldering iron. • Do not place PCBs that have had flux applied or have been soldered on top of each other. Otherwise, the flux on the PCB’s solder surface may stain the upper part of the Switch or even permeate the inside of the Switch and cause contact failure. Incorrect With the exception of PCB-mounting Switches, when performing hand soldering, hold the Switch so that the terminals point downwards so that flux does not get inside the Switch. Incorrect Correct Flux Do not place PCBs with solder or flux on top of each other. • 18 Leave a gap of at least 1 mm between the soldered parts and the surface of the case so that flux does not get inside the Switch. Technical Information Technical Information • When performing soldering with a dip soldering bath, ensure that the flux does not reach a higher level than the PCB. Incorrect Correct • Flux is especially likely to rise up at the edges of the PCB. If the Switch is mounted near the edge of the PCB, create a gap between the edge by using a split PCB, and insert the PCB in the soldering bath so that the edge that is farthest from the Switch enters the bath first. Create distance Create gap Split PCB Flux is more likely to rise at the edges. Insert in soldering bath from this edge. Storage • When the Switch is left unused or stored for long periods, the ambient conditions can have a great effect on the condition of the Switch. In certain environments, leaving the Switch exposed may result in deterioration (i.e., oxidation, or the creation of an oxide film) of the contacts and terminals, causing the contact resistance to increase, and making it difficult to solder the lead wires. Therefore, store in a well-ventilated room, inside, for example, a non-hygroscopic case, in a location where no corrosive gases are present. • If the Switch is stored in a location where it will be exposed to direct light, colored resin in the colored plate may fade. Therefore, do not store the Switch in locations where it will be exposed to direct light. 19 A3C A3C Precautions ! Caution Do not apply a voltage higher than the maximum rated operating voltage between the lamp terminals, as there is a risk that the incandescent lamp or LED lamp will be damaged, and the Pushbutton will be ejected. When replacing the incandescent lamp, first turn OFF the power supply, and then wait 10 minutes before performing replacement, as the lamp is still hot immediately after the power is turned OFF, so there is a risk of burns. Refer to the Common Precautions for Pushbutton Switches on page 14. Using Microloads Using a standard load switch for opening and closing a microload circuit may cause wear on the contacts. Use the switch within the operating range. (Refer to the diagram below.) Even when using microload models within the operating range shown below, if inrush current occurs when the contact is opened or closed, it may cause the contact surface to become rough, and so decrease life expectancy. Therefore, insert a contact protection circuit where necessary. The minimum applicable load is the N-level reference value. This value indicates the malfunction reference level for the reliability level of 60% (λ 60) (conforming to JIS C5003). The equation, λ 60 = 0.5 x 10–4/times indicates that the estimated malfunction rate is less than 1/2,000,000 with a reliability level of 60%. Voltage (V) Correct Use Mounting To prevent electric shock or a fire, always make sure that the power is turned OFF before mounting, removing, or wiring the Switch, or performing maintenance. Do not tighten the mounting ring excessively using pliers or a similar tool. Excessive tightening may damage the mounting ring. (Tightening torque: 0.20 to 0.39 N⋅m) Wiring When wiring, use wires of a size appropriate for the applied voltage and carry current. Perform soldering correctly under the conditions given below. Using the Switch with the wires soldered incorrectly may cause the terminals to become abnormally hot and cause a fire. 1. Hand soldering: At 30 W within 5 seconds. 2. Dip soldering: At 240°C within 3 seconds. Wait for one minute after soldering before exerting any external force on the solder. Use a non-corrosive rosin liquid for the flux. Perform wiring so that the wire sheaths do not come into contact with the Switch. If this is unavoidable, use wires that can withstand temperatures of 100°C min. After wiring to the Switch has been completed, ensure an appropriate insulation distance. Operating Environment Do not use in locations that are subject to dust, oil, or metal filings as these may penetrate the interior of the Switch and cause malfunction. 30 0.15 mA 26 mA 100 mA 24 Microload area Standard load area 12 Invalid area 5 1 mA 100 mA 150 mA 0 Current (mA) LED Resistance to limit the LED current is provided internally and so an external resistance is not required. Rated voltage Internal limiting resistance 5 VDC 33 Ω 12 VDC 270 Ω 24 VDC 1600 Ω ALL DIMENSIONS SHOWN ARE IN MILLIMETERS. To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527. Cat. No. A030-E1-05 46