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.
Omron Electronic Components, LLC
Terms and Conditions of Sales
I. GENERAL
1. Definitions: The words used herein are defined as follows.
(a) Terms:
These terms and conditions
(b) Seller:
Omron Electronic Components LLC and its subsidiaries
(c) Buyer:
The buyer of Products, including any end user in section III through VI
(d) Products: Products and/or services of Seller
(e) Including: Including without limitation
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invoices, purchase orders and other documents, whether electronic or in writing, relating
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purchase order or other documents which are inconsistent with, or in addition to, these
Terms.
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section III of these Terms.
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must be presented in detail in writing to Seller within 30 days of receipt of shipment.
III. PRECAUTIONS
1. Suitability: IT IS THE BUYER’S SOLE RESPOINSIBILITY TO ENSURE THAT ANY
OMRON PRODUCT IS FIT AND SUFFICIENT FOR USE IN A MOTORIZED VEHICLE
APPLICATION. BUYER SHALL BE SOLELY RESPONSIBLE FOR DETERMINING
APPROPRIATENESS OF THE PARTICULAR PRODUCT WITH RESPECT TO THE
BUYER’S APPLICATION INCLUDING (A) ELECTRICAL OR ELECTRONIC
COMPONENTS, (B) CIRCUITS, (C) SYSTEM ASSEMBLIES, (D) END PRODUCT, (E)
SYSTEM, (F) MATERIALS OR SUBSTANCES OR (G) OPERATING ENVIRONMENT.
Buyer acknowledges that it alone has determined that the Products will meet their
requirements of the intended use in all cases. Buyer must know and observe all
prohibitions of use applicable to the Product/s.
2. Use with Attention: The followings are some examples of applications for which
particular attention must be given. This is not intended to be an exhaustive list of all
possible use of any Product, nor to imply that any use listed may be suitable for any
Product:
(a) Outdoor use, use involving potential chemical contamination or electrical
interference.
(b) Use in consumer Products or any use in significant quantities.
(c) Energy control systems, combustion systems, railroad systems, aviation systems,
medical equipment, amusement machines, vehicles, safety equipment, and
installations subject to separate industry or government regulations.
(d) Systems, machines, and equipment that could present a risk to life or property.
3. Prohibited Use: NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING
SERIOUS RISK TO LIFE OR PROPERTY WITHOUT ENSURING THAT THE SYSTEM
AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE
PRODUCT IS PROPERLY RATED AND INSTALLED FOR THE INTENDED USE
WITHIN THE OVERALL EQUIPMENT OR SYSTEM.
4. Motorized Vehicle Application: USE OF ANY PRODUCT/S FOR A MOTORIZED
VEHICLE APPLICATION MUST BE EXPRESSLY STATED IN THE SPECIFICATION BY
SELLER.
5. Programmable Products: Seller shall not be responsible for the Buyer's programming of
a programmable Product.
IV. WARRANTY AND LIMITATION
1. Warranty: Seller's exclusive warranty is that the Products will be free from defects in
materials and workmanship for a period of twelve months from the date of sale by Seller
(or such other period expressed in writing by Seller). SELLER MAKES NO WARRANTY
OR REPRESENTATION, EXPRESS OR IMPLIED, ABOUT ALL OTHER WARRANTIES,
NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE OF THE PRODUCTS.
2. Buyer Remedy: Seller's sole obligation hereunder shall be to replace (in the form
originally shipped with Buyer responsible for labor charges for removal or replacement
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amount equal to the purchase price of the Product; provided that there shall be no
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SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES, LOSS OF
PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY WAY CONNECTED
WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED IN CONTRACT,
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THE PRODUCT ON WHICH LIABILITY IS ASSERTED.
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omissions under these Terms or in any way with respect to the Products.
V. INFORMATION; ETC.
1. Intellectual Property: The intellectual property embodied in the Products is the exclusive
property of Seller and its affiliates and Buyer shall not attempt to duplicate it in any way
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intellectual property rights of another party.
2. Property; Confidentiality: Notwithstanding any charges to Buyer for engineering or
tooling, all engineering and tooling shall remain the exclusive property of Seller. All
information and materials supplied by Seller to Buyer relating to the Products are
confidential and proprietary, and Buyer shall limit distribution thereof to its trusted
employees and strictly prevent disclosure to any third party.
3. Performance Data: Performance data is provided as a guide in determining suitability
and does not constitute a warranty. It may represent the result of Seller's test conditions,
and the users must correlate it to actual application requirements.
4. Change In Specifications: Product specifications and descriptions may be changed at
any time based on improvements or other reasons. It is Seller’s practice to change part
numbers when published ratings or features are changed, or when significant
engineering changes are made. However, some specifications of the Product may be
changed without any notice.
5. Errors And Omissions: The information on Seller’s website or in other documentation
has been carefully checked and is believed to be accurate; however, no responsibility is
assumed for clerical, typographical or proofreading errors or omissions.
6. Export Controls: Buyer shall comply with all applicable laws, regulations and licenses
regarding (a) export of the Products or information provided by Seller; (b) sale of
Products to forbidden or other proscribed persons or organizations; (c) disclosure to noncitizens of regulated technology or information.
VI. MISCELLANEOUS
1. Waiver: No failure or delay by Seller in exercising any right and no course of dealing
between Buyer and Seller shall operate as a waiver of rights by Seller.
2. Assignment: Buyer may not assign its rights hereunder without Seller's written consent.
3. Law: These Terms are governed by Illinois law (without regard to conflict of laws).
Federal and state courts in Cook County, Illinois have exclusive jurisdiction for any
dispute hereunder.
4. Amendment: These Terms constitute the entire agreement between Buyer and Seller
relating to the Products, and no provision may be changed or waived unless in writing
signed by the parties.
5. Severability: If any provision hereof is rendered ineffective or invalid, such provision shall
not invalidate any other provision.
Snap Action Switch
A
Certain Precautions on Specifications and Use
1. Suitability for Use. Seller shall not be responsible for conformity with any standards, codes or regulations which apply to the combination of the Product in
Buyer's application or use of the Product. At Buyer's request, Seller will provide applicable third party certification documents identifying ratings and limitations of use which apply to the Product. This information by itself is not
sufficient for a complete determination of the suitability of the Product in combination with the end product, machine, system, or other application or use.
Buyer shall be solely responsible for determining appropriateness of the particular Product with respect to Buyer's application, product or system. Buyer
shall take application responsibility in all cases but the following is a nonexhaustive list of applications for which particular attention must be given:
(i) Outdoor use, uses involving potential chemical contamination or electrical
interference, or conditions or uses not described in this document.
(ii) Energy control systems, combustion systems, railroad systems, aviation
systems, medical equipment, amusement machines, vehicles, safety
equipment, and installations subject to separate industry or government
regulations.
(iii) Use in consumer products or any use in significant quantities.
(iv) Systems, machines and equipment that could present a risk to life or
property. Please know and observe all prohibitions of use applicable to this
product.
NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS
RISK TO LIFE OR PROPERTY WITHOUT ENSURING THAT THE SYSTEM
AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT
THE OMRON PRODUCT IS PROPERLY RATED AND INSTALLED FOR THE
INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.
2. Programmable Products. Seller shall not be responsible for the user's programming of a programmable product, or any consequence thereof.
3. Performance Data. Performance data given in this publication is provided as
a guide for the user in determining suitability and does not constitute a warranty. It may represent the result of Seller's test conditions, and the users must
correlate it to actual application requirements. Actual performance is subject to
Seller's Warranty and Limitations of Liability.
4. Change in Specifications. Product specifications and accessories may be
changed at any time based on improvements and other reasons. It is our practice to change part numbers when published ratings or features are changed,
or when significant construction changes are made. However, some specifications of the Product may be changed without any notice. When in doubt, special part numbers may be assigned to fix or establish key specifications for
your application. Please consult with your Seller representative at any time to
confirm actual specifications of purchased Product.
5. Errors and Omissions. The information in this publication has been carefully
checked and is believed to be accurate; however, no responsibility is assumed
for clerical, typographical or proofreading errors, or omissions.
6. RoHS Compliance. Where indicated, our products currently comply, to the
best of our knowledge as of the date of this publication, with the requirements
of the European Union's Directive on the Restriction of certain Hazardous
Substances ("RoHS"), although the requirements of RoHS do not take effect
until July 2006. These requirements may be subject to change. Please consult
our website for current information.
Complete “Terms and Conditions of Sale” for product purchase and use are on Omron’s website
at http://www.components.omron.com – under the “About Us” tab, in the Legal Matters section.
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
11/09
Snap Action Switch
A
Specifications subject to change without notice
Printed in USA