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General-purpose Basic Switch
A
CSM_A_DS_E_3_4
High-capacity Switch Capable of
Handling 20 A Loads with Large
Inrush Currents
• Same shape as OMRON Z Basic Switches except in pin
plunger position, yet endures inrush currents as large as 75 A.
Be sure to read Safety Precautions on page 6 and Safety
Precautions for All Basic Switches.
For the most recent information on models that have been certified for
safety standards, refer to your OMRON website.
Model Number Structure
Ordering Information
Model Number Legend
Terminal
A - 20 G @ - @
Solder terminal
Actuator
(1) (2) (3) (4)
Screw terminal (-B)
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
Panel mount roller plunger
A-20GQ22
A-20GQ22-B
---
A-20GQ21-B
Short hinge lever
A-20GV21
A-20GV21-B
Hinge lever
A-20GV
A-20GV-B
Short hinge roller lever
A-20GV22
A-20GV22-B
Hinge roller lever
A-20GV2
A-20GV2-B
(1) Ratings
20
: 20 A (250 VAC)
(2) Contact Gap
G
: 0.5 m
(3) Actuator
None
D
Q
Q21
Q22
V
V2
V21
V22
: Pin plunger
: Short spring plunger
: Panel mount plunger
: Panel mount cross roller plunger
: Panel mount roller plunger
: Hinge lever
: Hinge roller lever
: Short hinge lever
: Short hinge roller lever
Panel mount cross roller plunger
(4) Terminals
None : Solder terminal
B
: Screw terminal (with toothed washer)
Specifications
Ratings
Rated
voltage
(V)
125 VAC
250 VAC
500 VAC
8 VDC
14 VDC
30 VDC
125 VDC
250 VDC
Certified Standard Ratings
Non-inductive load (A)
Resistive
load
NC
NO
20
20
15
20
20
6
0.5
0.25
Lamp load
NC
NO
3
3
3
0.5
0.25
Inductive
load
NC
NO
20
20
10
7.5
7.5
4
1.5
1.5
1.5
0.5
0.25
Ask your OMRON representative for information on certified models.
Inductive load (A)
20
15
5
0.05
0.03
Motor load
NC
NO
12.5
8.3
2
12.5
12.5
5
0.05
0.03
UL/CSA (General ratings only)
Rated voltage
Model
A-20G
125 VAC
1 HP 10 A "L"
250 VAC
2 HP
480 VAC
20 A
125 VDC
0.5 A
250 VDC
0.25 A
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.
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
1
A
Engineering Data
Characteristics
240 operations/min
Electrical
20 operations/min
Insulation resistance
100 MΩ min. (at 500 VDC)
Contact resistance
15 mΩ max. (initial value)
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-currentcarrying metal parts
Vibration
resistance
Shock resistance
Durability
Malfunction
10 to 55 Hz, 1.5-mm double amplitude *2
Destruction
1,000 m/s2 max.
Malfunction
300 m/s2 max. *1 *2
Mechanical
1,000,000 operations min.
Electrical
500,000 operations min.
Durability (x10 4 operations)
Mechanical
1,000
700
Ambient temperature: 20 ±2 °C
Ambient humidity: 65 ±5%RH
Without load
Operating frequency:
240 operations/min
500
300
100
70
50
30
10
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7 0.8
Overtravel (mm)
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
Weight
Approx. 22 to 58 g
Electrical Durability (A-20G)
*1. The value is for the pin plunger. (Contact your OMRON representative for
other models.)
*2. Malfunction: 1 ms max.
Durability (x10 4 operations)
Operating
frequency
Mechanical Durability (A-20G)
0.01 mm to 1m/s *1
Operating speed
1,000
700
Ambient temperature: 20 ±2 °C
Ambient humidity: 65 ±5%RH
Operating frequency:
20 operations/min
500
300
125 VAC, cosφ = 1
125 VAC,
cosφ = 0.4
250 VAC,
cosφ = 1
100
70
Contact Specification
50
Shape
Contacts
Rivet
Material
30
Silver alloy
Gap (standard value)
Inrush current
250 VAC, cosφ = 0.4
0.5 mm
NC
75 A max.
NO
75 A max.
10
0
5
10
15
20
25
Switching current (A)
Structure
Contact Form (SPDT)
COM
NC
NO
Dimensions
(Unit: mm)
Terminals
Mounting Holes
Screw Terminals (-B)
Use 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
9.2
20
20
17.45±0.2
COM
1
NO
NC
3
2
49.2
25.4±0.1
Three, M4 × 5.5
Terminal screws
(with toothed washer)
Solder Terminal (-A) ("-A" is not included in the model numbers.)
The Switch can be panel mounted, provided that the hexagonal nut of
the actuator is tightened to a torque of 2.94 to 4.9 N·m.
Panel Mount Plunger
+ 0.2
12.5 0 dia.
Panel Mount Roller Plunger
12.5
+ 0.2
0 dia.
5 + 0.2
0
6.4
25.4±0.1
11.9
17.45±0.2
13 + 0.2
0
3
1 NO
COM
NC
2
49.2
Note: 1. Appropriate terminal screw tightening torque: 0.78 to 1.18 N·m.
2. Unless otherwise specified, a tolerance of ±0.4 mm applies to all dimensions.
2
A
Dimensions and Operating Characteristics
The models, illustrations, and graphics are for screw-terminal models. (The dimensions for models that are omitted here are the same as for pin-plunger models.)
Pin Plunger
A-20G-B
19.05±0.25
PT
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
Short Spring Plunger
A-20GD-B
17.45±0.2
* Stainless-steel plunger
15 dia.
PT
19.05±0.25
11.2 dia.
7.15
11.9SR *
dia.
7.5
OP
24.2
9.2
* Stainless-steel plunger
17.45±0.2
Panel Mount Plunger
A-20GQ-B
PT
19.05±0.25
OP
8.35 dia.
11.9SR *1
M12 × 1 mounting screw
Note: Do not use both M12
mounting screw and
Two hexagon nuts
mounting holes at the
(2 t × 14 width across flats)
same time.
*2
13.1
Two lock nuts
(2 t × 15.6 width across flats)
16.3
16 dia.
9.2
*1 Stainless-steel plunger
*2 Incomplete screw part with a
maximum length of 1.5 mm.
17.45±0.2
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.
*1 Stainless-steel roller
16 dia.
9.2
*2 Incomplete screw part with a
maximum length of 1.5 mm.
17.45±0.2
Panel Mount Cross Roller Plunger PT
A-20GQ21-B
19.05±0.25
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
Note: Do not use both M12
mounting screw and
mounting holes at the
*1 Stainless-steel roller
same time.
16 dia.
9.2
*2 Incomplete screw part with
a maximum length of 1.5 mm.
17.45±0.2
Note: Unless otherwise specified, a tolerance of ±0.4 mm applies to all dimensions.
Operating Characteristics
A-20G-B
A-20GD-B
A-20GQ-B
A-20GQ22-B
A-20GQ21-B
Operating force
Release force
Pretravel
Over Travel
Movement differential
OF
RF min.
PT max.
OT min.
MD max.
Model
3.92 to 6.13 N
2.79 N
1.3 mm
0.25 mm
0.2 mm
3.92 to 6.13 N
2.79 N
1.3 mm
3 mm
0.2 mm
3.92 to 6.13 N
2.79 N
1.3 mm
5.6 mm
0.2 mm
6.18 N max.
2.75 N
1.3 mm
3.58 mm
0.35 mm
6.18 N max.
2.75 N
1.3 mm
3.58 mm
0.35 mm
Operating Position
OP
16.3±0.4 mm
26.2±0.5 mm
21.8±0.8 mm
33.4±1.2 mm
33.4±1.2 mm
3
A
Short Hinge Lever
A-20GV21-B
24.56±0.25
t=1*
.3R
28
4.9
PT
20.2 17.9
14.7 OP
9.2
* Stainless-steel lever
17.45±0.2
Hinge Lever
A-20GV-B
24.56±0.25
5R
63.
PT
t=1*
20.2 17.9
4.9
14.7 OP
9.2
* Stainless-steel lever
17.45±0.2
Short Hinge Roller Lever
A-20GV22-B
24.56±0.25
9.5 dia. × 4
(plastic roller)
t=1*
26
.2
R
PT
OP
20.2 17.9
14.7
9.2
* Stainless-steel lever
17.45±0.2
Hinge Roller Lever
A-20GV2-B
9.5 dia. × 4
(plastic roller)
24.56±0.25
PT
.4R
48
t=1*
OP
20.2 17.9
14.7
9.2
* Stainless-steel lever
17.45±0.2
Note: Unless otherwise specified, a tolerance of ±0.4 mm applies to all dimensions.
Operating Characteristics
OF max.
RF min.
PT max.
OT min.
MD max.
OP
Model
A-20GV21-B
A-20GV-B
A-20GV22-B
A-20GV2-B
1.57 N
0.41 N
6.5 mm
1.2 mm
1.2 mm
0.69 N
0.14 N
15.9 mm
4 mm
2.4 mm
1.57 N
0.41 N
6.3 mm
1.2 mm
1.2 mm
0.88 N
0.14 N
12 mm
2.4 mm
2.2 mm
19±0.8 mm
19±0.8 mm
29.8±0.8 mm
30.2±0.8 mm
4
A
Accessories (Order Separately)
A Terminal Protective Cover and a Separator are available.
Terminal Covers (Sold Separately)
Separator (Sold Separately)
The Terminal Covers can be attached to Z, A, X, and DZ Switches.
The Terminal Cover is secured with mounting screws and protects the casing and terminal wires
from dust, vibration, or fingers, thus preventing terminal short-circuiting, ground faults, wire
disconnection or improper connection, and electric shock accidents.
Terminal Covers made of phenol resin have five or six thin wall sections. These sections can be
torn open for providing holes for lead cables at desired points.
A terminal cover can’t be used in the case of using an actuator sold separately.
Use a Separator when it is difficult to
provide a sufficient insulation distance or
when using the Switch near metal parts or
copper wires.
Operation Information
Model
SEPARATOR FOR Z
Operation Information
Application Soldering terminal use
Material
Mounting direction
Phenol resin
Side mounting
Metal press mold Side mounting
Vinyl chloride
Screw terminal use
Remarks
Model
AP-A
AP-B
---
AP1-A
AP1-B
Used for AP-A and AP-B
Side mounting
AP-Z
---
Note: Use a Terminal Cover for screw terminals fir DZ-series Switches with soldering terminals.
Dimensions (Unit: mm)
Terminal Covers
Soldering Terminal Use
(Phenol Resin)
25.4
4.3＋0.2
0
53.8
AP-B
52.8
AP-A
25.4
4.3＋0.2
0
Screw Terminal Use
(Phenol Resin)
4.3＋0.2
0
4.3＋0.2
0
8
8
16.3
6.5
R2.15
8
Soldering Terminal Use
(Metal Press Mold)
8
21
Note: The Cover has six thin, easy-to-separate
portions for easy lead wire connections.
55.4
AP1-B
54.4
25.4
4.3＋0.2
0
6.5
21
Note: The Cover has five thin, easy-to-separate
portions for easy lead wire connections.
AP1-A
20.2
R2.15
25.4
4.3＋0.2
0
Screw Terminal Use
(Metal Press Mold)
4.3＋0.2
0
4.3＋0.2
0
8
8
17.1
R2.15
21
R2.15
7.2
7
8.5 22.6
Note: The Cover has five holes for easy lead wire connections.
AP-Z
8.5 22.6
Note: The Cover has six holes for easy lead wire connections.
2-φ4.2
52.8
25.4
押え板
（t1鋼板）
Soldering or Screw Terminal Use
(Vinyl Chloride)
21
Cable Pull-out Dimension
7
14
A−A′
断面
21
15
39
A
A′
B
13
15
座金ナット
M3×20プラス小ねじ
（平座金、座金ナット付）
B′
φ8
B−B′
断面
13
φ6
46
Note: A 6-dia. or 8-dia. cable can be
used by cutting the cable pull-out
hole to the size of the cable to be
used.
12
Note: Each dimension has a tolerance of ±0.4 mm unless otherwise specified. (±0.8 mm for the AP-Z)
Separator
2-φ4.5
13.5
27±0.5
25.4±0.2
49.2±0.5
Note: 1. Each dimension has a tolerance of ±0.4 mm unless otherwise specified.
2. The material is EAVTC (Epoxide Alkyd Varnished Tetron Cloth) and its heat-resisting
temperature is 130°C.
11.9
t＝0.51
5
A
Safety Precautions
Refer to Safety Precautions for All Basic Switches.
Precautions for Safe Use
Terminal Connection
When you wire a Switch, use a wire size that is suitable for the applied
voltage and current flow. When soldering wires to the Switch, make
sure that the capacity of the soldering iron is 60 W maximum and
complete soldering within 5 s. If soldering is not performed correctly,
heat may be abnormally generated when the Switch is used, which
may cause burning. The characteristics of the Switch will deteriorate
if a soldering iron with a capacity of more than 60 W is used or if heat
is applied to the Switch for more than 5 s.
• 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
Separate the
installation location from
heat sources.
Operation
• 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
Correct
• Do not use the switch in locations subject to hot water (greater than
60°C) or in water vapor.
• 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.
Wiring
• Use wire sizes that are suitable to the applied voltage and carried
current.
• If you use a soldering iron to solder the wires, do not allow the tip of
the soldering iron to exceed 380°C. If a Switch is used with
insufficient soldering, abnormal heat and burning may occur.
• Solder for no more than 5 s at 350°C and for no more than 3 s at
380°C. If heat is applied for too long, the case may melt, the lead
wire coverings may be scorched, and other characteristics of the
Switch may deteriorate.
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.
6
Terms and Conditions Agreement
Read and understand this catalog.
Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you
have any questions or comments.
Warranties.
(a) Exclusive Warranty. Omron’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 Omron (or such other period expressed in writing by Omron). Omron
disclaims all other warranties, express or implied.
(b) Limitations. OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, ABOUT
NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE PRODUCTS. BUYER
ACKNOWLEDGES THAT IT ALONE HAS DETERMINED THAT THE
PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE.
Omron further disclaims all warranties and responsibility of any type for claims or expenses based on infringement by the
Products or otherwise of any intellectual property right. (c) Buyer Remedy. Omron’s sole obligation hereunder shall be, at
Omron’s election, to (i) replace (in the form originally shipped with Buyer responsible for labor charges for removal or
replacement thereof) the non-complying Product, (ii) repair the non-complying Product, or (iii) repay or credit Buyer an amount
equal to the purchase price of the non-complying Product; provided that in no event shall Omron be responsible for warranty,
repair, indemnity or any other claims or expenses regarding the Products unless Omron’s analysis confirms that the Products
were properly handled, stored, installed and maintained and not subject to contamination, abuse, misuse or inappropriate
modification. Return of any Products by Buyer must be approved in writing by Omron before shipment. Omron Companies shall
not be liable for the suitability or unsuitability or the results from the use of Products in combination with any electrical or
electronic components, circuits, system assemblies or any other materials or substances or environments. Any advice,
recommendations or information given orally or in writing, are not to be construed as an amendment or addition to the above
warranty.
See http://www.omron.com/global/ or contact your Omron representative for published information.
Limitation on Liability; Etc.
OMRON COMPANIES SHALL NOT BE LIABLE FOR 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, WARRANTY, NEGLIGENCE OR STRICT LIABILITY.
Further, in no event shall liability of Omron Companies exceed the individual price of the Product on which liability is asserted.
Suitability of Use.
Omron Companies shall not be responsible for conformity with any standards, codes or regulations which apply to the
combination of the Product in the Buyer’s application or use of the Product. At Buyer’s request, Omron 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.
NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY OR IN LARGE
QUANTITIES WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS,
AND THAT THE OMRON PRODUCT(S) IS PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE
OVERALL EQUIPMENT OR SYSTEM.
Programmable Products.
Omron Companies shall not be responsible for the user’s programming of a programmable Product, or any consequence
thereof.
Performance Data.
Data presented in Omron Company websites, catalogs and other materials is provided as a guide for the user in determining
suitability and does not constitute a warranty. It may represent the result of Omron’s test conditions, and the user must correlate
it to actual application requirements. Actual performance is subject to the Omron’s Warranty and Limitations of Liability.
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 Omron’s representative at
any time to confirm actual specifications of purchased Product.
Errors and Omissions.
Information presented by Omron Companies has been checked and is believed to be accurate; however, no responsibility is
assumed for clerical, typographical or proofreading errors or omissions.
2016.3
In the interest of product improvement, specifications are subject to change without notice.
OMRON Corporation
Industrial Automation Company
http://www.ia.omron.com/
(c)Copyright OMRON Corporation 2016 All Right Reserved.