Omron A User manual

General-purpose Basic Switch AF-131
Limit
Switches
General-purpose Basic Switch
A
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.
Model Number Structure
■Model Number Legend
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)
1 2 3 4
A-20G@-@

F-132 General-purpose Basic Switch A
Ordering Information
■List of Models
Note: Refer to Terminals in Model Z for solder and screw terminals.
Specifications
■Approved Standards
■Approved Standard Ratings
UL508 (File No. E41515)
CSA C22.2 No.55 (File No. LR21642)
Actuator Solder terminal Screw terminal (-B)
A-20G A-20G-B
A-20GD A-20GD-B
A-20GQ A-20GQ-B
A-20GQ22 A-20GQ22-B
--- A-20GQ21-B
A-20GV21 A-20GV21-B
A-20GV A-20GV-B
A-20GV22 A-20GV22-B
A-20GV2 A-20GV2-B
Agency Standard File No.
UL UL508 E41515
CSA CSA C22.2 No. 55 LR21642
Pin plunger
Short spring plunger
Panel mount plunger
Panel mount roller
plunger
Panel mount cross
roller plunger
Short hinge lever
Hinge lever
Short hinge roller
lever
Hinge roller lever
Rated voltage 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

General-purpose Basic Switch AF-133
Limit
Switches
■Ratings
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:
Ambient temperature: 20±2°C
Ambient humidity: 65±5%
Operating frequency: 20 operations/min
■Characteristics
Note: 1. The value is for the pin plunger. (Contact your OMRON representative for other models.)
2. Malfunction: 1 ms max.
■Contact Form (SPDT)
Rated voltage Non-inductive load Inductive load
Resistive load Lamp load Inductive load Motor load
NC NO NC NO NC NO NC NO
125 VAC
250 VAC
500 VAC
20 A
20 A
15 A
7.5 A
7.5 A
4 A
20 A
20 A
10 A
12.5 A
8.3 A
2 A
8 VDC
14 VDC
30 VDC
125 VDC
250 VDC
20 A
20 A
6 A
0.5 A
0.25 A
3 A
3 A
3 A
1.5 A
1.5 A
1.5 A
20 A
15 A
5 A
0.05 A
0.03 A
12.5 A
12.5 A
5 A
0.05 A
0.03 A
0.5 A
0.25 A
Operating speed 0.01 mm to 1 m/s (see note 1)
Operating frequency Mechanical: 240 operations/min
Electrical: 20 operations/min (under rated load)
Insulation resistance 100 MΩmin. (at 500 VDC)
Contact resistance 15 mΩmax. (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 ter-
minal and non-current-carrying metal parts
Vibration resistance Malfunction: 10 to 55 Hz, 1.5-mm double amplitude (see note 2)
Shock resistance Destruction: 1,000 m/s2{approx. 100G} max.
Malfunction: 300 m/s2{approx. 30G} max. (see note 1, 2)
Durability Mechanical: 1,000,000 operations min.
Electrical: 500,000 operations min.
Degree of protection IP00
Degree of protection against
electric shock Class I
Proof tracking index (PTI) 175
Switch category D (IEC335-1)
Ambient temperature Operating: −25°C to 80°C (with no icing)
Ambient humidity Operating: 35% to 85%
Weight Approx. 23 to 58 g

F-134 General-purpose Basic Switch A
■Contact Specification
Engineering Data
■Mechanical Durability ■Electrical Durability
Dimensions
Note: 1. All units are in millimeters unless otherwise indicated.
2. Unless otherwise specified, a tolerance of ±0.4 mm applies to all dimensions.
■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.)
NTLP: Anchored Frames in table above.
Item A-20
Contacts Shape Rivet
Material Silver alloy
Gap (standard value) 0.5 mm
Inrush current NC 75 A max.
NO 75 A max.
OF
RF min.
PT max.
OT min.
MD max.
3.92 to 6.13 N
{400 to 625 gf}
2.79 N {285 gf}
1.3 mm
0.25 mm
0.2 mm
OP 16.3±0.4 mm
OF
RF min.
PT max.
OT min.
MD max.
3.92 to 6.13 N
{400 to 625 gf}
2.79 N {285 gf}
1.3 mm
3 mm
0.2 mm
OP 26.2±0.5 mm
0.5
0.7
1
0.3
0.1
5
7
10
3
0.20.1 0.4 0.6 0.80.3 0.5 0.70
10
7
5
3
2
1
0.7
0.5
0.3
0.2
0.10 5 10 15 20 25
2
0.2
A-20G A-20G
Overtravel (mm) Switching current (A)
Durability (x106operations)
Durability (x106operations)
250 VAC, cosφ= 0.4
125 VAC, cosφ= 1
Ambient temperature: 20±2°C
Ambient humidity: 65±5%
Without load
Operating frequency: 240 operations/min
Ambient temperature: 20±2°C
Ambient humidity: 65±5%
Operating frequency: 20 operations/min
125 VAC,
cosφ= 0.4
250 VAC,
cosφ= 1
4.2+0.075
−0.025
OP
19.05±0.25
25.4±0.1
49.2
11.9
PT
17.45+0.2
9.2
24.2
Pin Plunger
A-20G-B
4.36+0.1 dia.
−0.05
2.3 dia. 2.3SR (stainless-steel plunger)
−0.025
4.2+0.075 dia. hole
OP
PT
19.05±0.25
7.5
24.2
15 dia.
Short Spring Plunger
A-20GD-B 11.2
dia.
7.15
dia.
11.9SR (stainless-
steel plunger)

General-purpose Basic Switch AF-135
Limit
Switches
Note: 1. Do not use both M12 mounting screw and mounting holes at the same time.
2. Imperfect screw part with a maximum length of 1.5 mm.
Note: 1. Do not use both M12 mounting screw and mounting holes at the same time.
2. Imperfect screw part with a maximum length of 1.5 mm.
Note: 1. Do not use both M12 mounting screw and mounting holes at the same time.
2. Imperfect screw part with a maximum length of 1.5 mm.
OF
RF min.
PT max.
OT min.
MD max.
3.92 to 6.13 N
{400 to 625 gf}
2.79 N (285 gf)
1.3 mm
5.6 mm
0.2 mm
OP 21.8±0.8 mm
OF
RF min.
PT max.
OT min.
MD max.
6.18 N {630 gf}
max.
2.75 N {280 gf}
1.3 mm
3.58 mm
0.35 mm
OP 33.4±1.2 mm
OF
RF min.
PT max.
OT min.
MD max.
6.18 N {630 gf}
max.
2.75 N {280 gf}
1.3 mm
3.58 mm
0.35 mm
OP 33.4±1.2 mm
OF
RF min.
PT max.
OT min.
MD max.
1.57 N {160 gf}
max.
0.41 N {42 gf}
6.5 mm
1.2 mm
1.2 mm
OP 19±0.8 mm
16.3
13.1
OP
PT
19.05±0.25
Panel Mount Plunger
A-20GQ-B 8.35 dia.
11.9SR (stainless-steel plunger)
16 dia.
(See note 2)
M12 ×1 mounting screw (see note 1)
Two hexagon nuts
(2 t ×14 width across flats)
Two lock nuts
(2 t ×15.6 width across flats)
16.3
15.5
OP
PT 19.05±0.25
Panel Mount Roller Plunger
A-20GQ22-B
16 dia.
(See
note 2)
12.7 dia. ×4.8
(stainless-steel roller)
Two hexagon nuts
(3 t ×17 width across flats)
M12 ×1 mounting screw
(see note 1)
16.3
15.5
OP
PT 19.05±0.25
Panel Mount Cross Roller Plunger
A-20GQ21-B
16 dia.
(See
note 2)
12.7 dia. ×4.8
(stainless-
steel roller)
Two hexagon nuts
(3 t ×17 width across flats)
M12 ×1 mounting
screw (see note 1)
17.9
20.2
28.3R
14.7
PT
4.9
24.56±0.25
OP
Short Hinge Lever
A-20GV21-B
t = 1
(stainless-
steel lever)

F-136 General-purpose Basic Switch A
.
■Terminals
OF
RF min.
PT max.
OT min.
MD max.
0.69 N {70 gf}
max.
0.14 N {14 gf}
15.9 mm
4 mm
2.4 mm
OP 19±0.8 mm
OF
RF min.
PT max.
OT min.
MD max.
1.57 N {160 gf}
0.41 N {42 gf}
6.3 mm
1.2 mm
1.22 mm
OP 29.8±0.8 mm
OF
RF min.
PT max.
OT min.
MD max.
0.88 N {90 gf}
0.14 N {14 gf}
12 mm
2.4 mm
2.2 mm
OP 30.2±0.8 mm
17.9
20.2
24.56±0.25 63.5R
14.7
4.9
Hinge Lever
A-20GV-B t = 1 (stainless-steel lever)
17.9
24.56±0.25
26.2R
20.2 14.7
PT
OP
Short Hinge Roller Lever
A-20GV22-B
9.5 dia. ×4 (plastic roller)
t = 1
(stainless-
steel lever)
17.9
20.2
24.56±0.25
48.4R
14.7
OP
PT
Hinge Roller Lever
A-20GV2-B 9.5 dia. ×4 (plastic roller)
t = 1
(stainless-
steel lever)
17.45±0.2
2020
9.2
49.2
17.45±0.2
25.4±0.1 11.9
6.4
49.2
Screw Terminals (-B) Solder Terminal
Three, M4 ×5.5
Terminal screws
(with toothed
washer)
Appropriate terminal screw tightening torque:
0.78 to 1.18 N⋅m {8 to 12 kgf⋅cm}.

General-purpose Basic Switch AF-137
Limit
Switches
Precautions
Refer to the Technical Information for Basic Switches (Cat. No. C122) for common precautions.
■Correct Use
Mounting
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 {12 to 15 kgf·cm}.
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 {30 to
50 kgf·cm}.
Mounting Holes
Panel-mounting (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.
■Accessories (Order Separately)
Refer to Z/A/X/DZ Common Accessories for details about Terminal
Covers, Separators, and Actuators.
25.4+0.1
Panel Mount Plunger Panel Mount Roller Plunger
12.5+0.2 dia.
0
Two, 4.2 dia. mount-
ing holes or M4 12.5+0.2 dia.
0

F-138 General-purpose Basic Switch A
In the interest of product improvement, specifications are subject to change without notice.
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. B002-E1-07