Snap Action Switch A General-purpose Snap Action Switch • High-capacity switch capable of handling 20 A loads with large inrush currents • Directly switches such loads as motors, halogen lamps and solenoids • Same shape as OMRON snap action switch model Z except in pin plunger position, yet endures inrush currents as large as 75 A. Ordering Information Terminal Solder terminal Screw terminal (-B) Actuator Model Model Pin plunger A-20G A-20G-B Short spring plunger A-20GD A-20GD-B Panel mount plunger A-20GQ A-20GQ-B A-20GQ22 A-20GQ22-B --- A-20GQ21-B A-20GV21 A-20GV21-B A-20GV A-20GV-B Short hinge roller lever A-20GV22 A-20GV22-B Hinge roller lever A-20GV2 A-20GV2-B Panel mount roller plunger Panel mount cross roller plunger Short hinge lever Hinge lever Model Number Legend A - 20 G 1 2 3 4 1. Ratings 20: 20 A (250 VAC) 2. Contact Gap G: 0.5 mm 3. Actuator None: Pin plunger D: Short spring plunger Q: Panel mount plunger Q21: Panel mount cross roller plunger Q22: Panel mount roller plunger V: Hinge lever V2: Hinge roller lever V21: Short hinge lever V22: Short hinge roller lever 4. Terminals None: Solder terminal B: Screw terminal (with toothed washer) Snap Action Switch A 19 Specifications ■ Characteristics Operating speed 0.01 mm to 1m/s (see note 1) Operating frequency Mechanical 240 operations/min Electrical 20 operations/min Contact resistance 15 mΩ max. (initial value) Insulation resistance 100 MΩ min. (at 500 VDC) Dielectric strength 1,000 VAC, 50/60 Hz for 1 min between terminals of the same polarity 2,000 VAC, 50/60 Hz for 1 min between the current-carrying metal parts and the ground, and between each terminal and non-current-carrying metal parts Vibration resistance Malfunction Shock resistance Destruction 10 to 55 Hz, 1.5-mm double amplitude (See note 2) 1,000 m/s2 max. Malfunction 300 m/s2 max. (See notes 1 and 2) Degree of protection IP00 Degree of protection against electric shock Class I Proof tracking index (PTI) 175 Ambient operating temperature − 25°C to 80°C (with no icing) Ambient operating humidity 35% to 85%RH Service life Mechanical 1,000,000 operations min. Electrical 500,000 operations min. Weight Approx. 22 to 58 g Note: 1. The value is for the pin plunger. 2. Malfunction: 1 ms max. ■ Operating Characteristics Characteristics A-20G-B A-20GD-B OF RF min. A-20GV21-B A-20GV-B A-20GV22-B A-20GV2-B 400 to 625 g A-20GQ-B 630 g max. 160 g 70 g 160 g 90 g 285 g 280g 42 g 14 g 42 g 14 g 6.5 mm 15.9 mm 6.3 mm 12 mm 2.4 mm PT max. A-20GQ22-B A-20GQ21-B 1.3 mm OT min. 0.25 mm 3 mm MD max. 5.6 mm 3.58 mm 1.2 mm 4 mm 1.2 mm 0.35 mm 1.2 mm 2.4 mm 1.2 mm 2.2 mm 33.4±1.2 mm 19±0.8 mm 19±0.8 mm 29.8±0.8 mm 30.2±0.8 mm 0.2 mm OP 16.3±0.4 mm 26.2±0.5 mm 21.8±0.8 mm ■ Ratings Non-inductive load (A) Rated voltage (V) Resistive load NC NO 125 VAC 250 VAC 500 VAC 20 20 15 8 VDC 14 VDC 30 VDC 125 VDC 250 VDC 20 20 6 0.5 0.25 Inductive load (A) Lamp load NC Inductive load NO NC 7.5 7.5 4 3 3 3 0.5 0.25 Note: 1. The above values are for steady-state current. 2. Inductive load has a power factor of 0.4 min. (AC) and a time constant of 7 ms max. (DC). 3. Lamp load has an inrush current of 10 times the steady-state current. ■ Contact Specification 1.5 1.5 1.5 0.5 0.25 Motor load NO NC NO 20 20 10 12.5 8.3 2 20 15 5 0.05 0.03 12.5 12.5 5 0.05 0.03 4. Motor load has an inrush current of 6 times the steady-state current. 5. The ratings values apply under the following test conditions: (1) Ambient temperature: 20±2°C (2) Ambient humidity: 65±5%RH (3) Operating frequency: 20 operations/min ■ Safety Standards Ratings UL/CSA (General ratings only) Contacts Shape Rivet Material Silver alloy Gap (standard value) Inrush current 20 0.5 mm NC 75 A max. NO 75 A max. Snap Action Switch A Rated voltage A-20G 125 VAC 1 HP and 10 A "L" (Tungsten) 250 VAC 2 HP 480 VAC 20 A 125 VDC 0.5 A 250 VDC 0.25 A Engineering Data 1,000 700 Ambient temperature: 20 ±2 °C Ambient humidity: 65 ±5%RH Without load Operating frequency: 240 operations/min 500 300 100 ■ Electrical Durability (A-20G) Durability (x10 4 operations) Durability (x10 4 operations) ■ Mechanical Durability (A-20G) 1,000 700 300 70 50 50 30 30 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 125 VAC, cosφ = 1 125 VAC, cosφ = 0.4 250 VAC, cosφ = 1 100 70 10 Ambient temperature: 20 ±2 °C Ambient humidity: 65 ±5%RH Operating frequency: 20 operations/min 500 250 VAC, cosφ = 0.4 10 0 5 10 15 20 25 Switching current (A) Overtravel (mm) ■ Structure Contact Form (SPDT) COM NC NO Dimensions Note: Unless otherwise specified, all units are in millimeters and a tolerance of ± 0.4 mm applies to all dimensions. ■ Terminals Screw Terminals (-B) Solder Terminal (Blank) 6.4 9.2 20 25.4±0.1 20 11.9 17.45±0.2 17.45±0.2 3 COM 1 NO NC 3 2 49.2 1 NO COM NC 2 Three, M4 × 5.5 Terminal screws (with toothed washer) 49.2 Note: Appropriate terminal screw tightening torque: 0.78 to 1.18 N·m. ■ Mounting Holes All switches can be mounted using M4 mounting screws with plane washers or spring washers to securely mount the Switch. Tighten the screws to a torque of 1.18 to 1.47 N·m. Two, 4.2 dia. mounting holes or M4 Versions with panel mount plungers can be panel mounted via the plunger, provided that the hexagonal nut of the actuator is tightened to a torque of 2.94 to 4.9 N·m. Panel Mount Plunger 12.5 Panel Mount Roller Plunger + 0.2 0 dia. 12.5 + 0.2 0 dia. 25.4±0.1 5 + 0.2 0 13 + 0.2 0 Note: Mount using either the side mounting holes or the panel mount plunger, not both. If using the side mounting holes, then remove the hexagonal nut(s) from the panel mount plunger. Accessories (Terminal Covers, and Separators): Refer to ‘Z/A/X/DZ Common Accessories’ datasheet Snap Action Switch A 21 Note: 1. All drawings show the switches with screw terminals. For solder terminals, remove the “-B” from the end of the part number 2. Unless otherwise specified, all units are in millimeters and a tolerance of ± 0.4 mm applies to all dimensions. Pin Plunger 19.05±0.25 PT A-20G-B 2.3 dia. 4.2 +0.075 −0.025 dia. hole 2.3SR * OP 24.2 9.2 4.2 +0.075 −0.025 dia. 4.36 +0.1 −0.05dia. 11.9 25.4±0.1 49.2 17.45±0.2 * Stainless-steel plunger Short Spring Plunger 15 dia. A-20GD-B 11.2 dia. 7.15 11.9SR * dia. PT 19.05±0.25 7.5 OP 24.2 * Stainless-steel plunger Panel Mount Plunger PT 19.05±0.25 8.35 dia. 11.9SR *1 Note: Do not use both M12 mounting screw and mounting holes at the Two hexagon nuts same time. (2 t × 14 width across flats) M12 × 1 mounting screw A-20GQ-B OP 13.1 *2 16.3 16 dia. Two lock nuts (2 t × 15.6 width across flats) *1 Stainless-steel plunger *2 Incomplete screw part with a maximum length of 1.5 mm. Panel Mount Roller Plunger A-20GQ22-B 19.05±0.25 PT 12.7 dia. × 4.8 *1 Two hexagon nuts (3 t × 17 width across flats) OP M12 × 1 mounting screw 15.5 *2 16.3 Note: Do not use both M12 mounting screw and mounting holes at the same time. 16 dia. *1 Stainless-steel roller *2 Incomplete screw part with a maximum length of 1.5 mm. Panel Mount Cross Roller Plunger A-20GQ21-B 19.05±0.25 PT 12.7 dia. × 4.8 *1 Two hexagon nuts (3 t × 17 width across flats) OP 15.5 M12 × 1 mounting screw *2 16.3 16 dia. Note: Do not use both M12 mounting screw and mounting holes at the same time. *1 Stainless-steel roller *2 Incomplete screw part with a maximum length of 1.5 mm. 22 Snap Action Switch A Note: 1. All drawings show the switches with screw terminals. For solder terminals, remove the “-B” from the end of the part number 2. Unless otherwise specified, all units are in millimeters and a tolerance of ± 0.4 mm applies to all dimensions. Short Hinge Lever 24.56±0.25 A-20GV21-B t=1* .3R 28 4.9 PT 20.2 17.9 14.7 OP * Stainless-steel lever Hinge Lever 24.56±0.25 A-20GV-B 5R 63. PT t=1* 20.2 17.9 4.9 14.7 OP * Stainless-steel lever 24.56±0.25 Short Hinge Roller Lever 9.5 dia. × 4 (plastic roller) t=1* PT 26 .2 R A-20GV22-B OP 20.2 17.9 14.7 * Stainless-steel lever Hinge Roller Lever 9.5 dia. × 4 (plastic roller) 24.56±0.25 PT A-20GV2-B .4R 48 t=1* OP 20.2 17.9 14.7 * Stainless-steel lever Snap Action Switch A 23 Safety Precautions Be sure to read the precautions and information common to all Snap Action and Detection Switches, contained in the Technical User’s Guide, “Snap Action Switches, Technical Information” for correct use. Precautions for Safe Use Terminal Connection When soldering lead wires to the Switch, make sure that the capacity of the soldering iron is 60 W maximum. Do not take more than 5 s to solder any part of the Switch. The characteristics of the Switch will deteriorate if a soldering iron with a capacity of more than 60 W is applied to any part of the Switch for 5 s or more. Operation • Do not use the switch in locations subject to hot water (greater than 60°C) or in water vapor. • Do not use the switch outside the specified temperature and atmospheric conditions. The permissible ambient temperature depends on the model. (Refer to the specifications in this catalog.) Sudden thermal changes may cause thermal shock to distort the switch and result in faults. Incorrect Correct • Make sure that the switching frequency or speed is within the specified range. 1. If the switching speed is extremely slow, the contact may not be switched smoothly, which may result in a contact failure or contact welding. 2. If the switching speed is extremely fast, switching shock may damage the Switch soon. If the switching frequency is too high, the contact may not catch up with the speed. The rated permissible switching speed and frequency indicate the switching reliability of the Switch. The life of a Switch is determined at the specified switching speed. The life varies with the switching speed and frequency even when they are within the permissible ranges. In order to determine the life of a Switch model to be applied to a particular use, it is best to conduct an appropriate durability test on some samples of the model under actual conditions. • Make sure that the actuator travel does not exceed the permissible OT position. The operating stroke must be set to 70% to 100% of the rated OT. Precautions for Correct Use Mounting Location • Do not use the switch alone in atmospheres such as flammable or explosive gases. Arcing and heat generation associated with switching may cause fires or explosions. • Switches are generally not constructed with resistance against water. Use a protective cover to prevent direct spraying if the switch is used in locations subject to splashing or spurting oil or water, dust adhering. Incorrect Terminal box Correct Terminal box • Install the switch in a location that is not directly subject to debris and dust from cutting. The actuator and the switch body must be protected from accumulated cutting debris and dirt. Incorrect 24 Snap Action Switch Correct A Separate the installation location from heat sources. • Mount a cover if the switch is to be installed in a location where worker inattention could result in incorrect operation or accidents. Correct Incorrect (preventing malfunctions) • Subjecting the switch to continuous vibration or shock may result in contact failure or faulty operation due to abrasion powder and in reduced durability. Excessive vibration or shock will cause the contacts to operate malfunction or become damaged. Mount the switch in a location that is not subject to vibration or shock and in a direction that does not subject the switch to resonance. • If silver contacts are used with relatively low frequency for a long time or are used with microloads, the sulfide coating produced on the contact surface will not be broken down and contact faults will result. Use a microload switch that uses gold contacts. • Do not use the switch in atmospheres with high humidity or heat or in harmful gases, such as sulfide gas (H2S, SO2), ammonia gas (NH3), nitric acid gas (HNO3), or chlorine gas (Cl2). Doing so may impair functionality, such as with damage due to contacting faults or corrosion. • The switch includes contacts. If the switch is used in an atmosphere with silicon gas, arc energy may cause silicon oxide (SiO2) to accumulate on the contacts and result in contact failure. If there is silicon oil, silicon filling, silicon wiring, or other silicon products in the vicinity of the switch, use a contact protection circuit to limit arcing and remove the source of the silicon gas. Panel-mounting model (A-20GQ@) • If a Switch is side-mounted with screws, remove the hexagonal nut of the actuator. • If a Switch is side-mounted and secured with screws, make sure that the angle or speed of the actuating object is not excessively large or too high, otherwise the Switch may be damaged. • If a Switch is panel-mounted, pay utmost attention to make sure that the actuating speed or OT distance is not excessively high or large. Not doing so may damage the Switch. MEMO Snap Action Switch A All sales are subject to Omron Electronic Components LLC standard terms and conditions of sale, which can be found at http://www.components.omron.com/components/web/webfiles.nsf/sales_terms.html ALL DIMENSIONS SHOWN ARE IN MILLIMETERS. To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527. OMRON ON-LINE OMRON ELECTRONIC COMPONENTS LLC Global - http://www.omron.com USA - http://www.components.omron.com 55 E. Commerce Drive, Suite B Schaumburg, IL 60173 847-882-2288 Cat. No. X303-E-1 11/10 Snap Action Switch A Specifications subject to change without notice Printed in USA