Omron A3A Series User manual

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A3A
Lighted Pushbutton Switch
Compact High-capacity
Push-button Switch
●Ideal for use as a high breaking capacity Power
Switch.
●Switches from micro load (minimum applicable load:
5 VDC 1mA) to high capacity load.
List of Models
Model Number Structure
■Model Number Legend (Ordering as a Set)......
RoHS Compliant
Refer to Safety Precautions for All Pushbutton Switches/Indicators
and Safety Precautions on page 8.
●Non-lighted Push-button Switches ●Lighted Push-button Switches
Appearance Model Illumination Appearance Model
Square A3AA-9@
@1-00@
LED
surface
illumination
Square A3AA-9@
@1-00E@
Round A3AT-9@
@1-00@Round A3AT-9@ @1-00E@
The model numbers used to order sets of Units are illustrated below.
One set comprises the Pushbutton (LED lamp built-in) and Switch.
For information on combinations, refer to Ordering Information.
A3AA-90K1-00E R
(1) Shape of Pushbutton
(2) Terminal
(3) Switch Specifications
Symbol Shape
A Square
T Round
Symbol Type
0 Solder
1PCB
Symbol Operation Contact type
A Momentary SPDT 3 A at 125 VAC,
2 A at 30 VDC
B Alternate
K Momentary
SPST-NO
6 A at 125 VAC,
2 A at 250 VAC,
4 A at 30 VDC
L Alternate
(
)
(
)
(4) Illumination
Symbol Operation
00 Non-lighted
00E Surface illumination
(5) Pushbutton Color
1. Non-lighted Models
2. LED Surface
Illumination Models
* The color is the same for both LED
surface illumination models and
non-lighted models (translucent).
Symbol Pushbutton Color
L Light gray
RRed*
Y Yellow*
G Green*
ABlue
BBlack
D Dark gray
HGray
Symbol Pushbutton Color
RRed
Y Yellow
GGreen
(1) (2) (3) (5)(4)
■Specifications: Refer to page 3. ■Dimensions: Refer to page 5.
■Accessories: Refer to page 2.

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List of Models
SPST-NO
Note: The above models each have a SPST-NO contact that can switch 6 A at 125 VAC, 2 A at 250 VAC, and 4 A at 30 VDC. When ordering any of the above models,
replace @of the model number with a code to indicate the pushbutton color of the model (i.e., replace @with R, Y, G, L, A, B, D, H, and L). The pushbutton of
an A3A does not illuminate if the color of the pushbutton is dark gray, gray, light gray, blue, or black.
SPDT
■Accessories
Flange (Select according to panel color.)
Note: An A3A with solder terminals is provided with a round or square black flange and leaf spring. A round black flange is provided with each A3A having solder
terminals and a round pushbutton. A square black flange is provided with each A3A having solder terminals and a square pushbutton.
Appearance Terminal Operation Illumination Model Color symbol for
pushbutton
Minimum
packing unit
Square/A3AA
Solder
Momentary Non-lighted A3AA-90K1-00@
(Non-lighted)
R (red)
Y (yellow)
G (green)
L (light gray)
A (blue)
B (black)
D (dark gray)
H (gray)
(Surface illumination)
R (red)
Y (yellow)
G (green)
100
LED surface illumination A3AA-90K1-00E@
Alternate Non-lighted A3AA-90L1-00@
LED surface illumination A3AA-90L1-00E@
PCB
Momentary Non-lighted A3AA-91K1-00@
LED surface illumination A3AA-91K1-00E@
Alternate Non-lighted A3AA-91L1-00@
LED surface illumination A3AA-91L1-00E@
Round/A3AT
Solder
Momentary Non-lighted A3AT-90K1-00@
LED surface illumination A3AT-90K1-00E@
Alternate Non-lighted A3AT-90L1-00@
LED surface illumination A3AT-90L1-00E@
PCB
Momentary Non-lighted A3AT-91K1-00@
LED surface illumination A3AT-91K1-00E@
Alternate Non-lighted A3AT-91L1-00@
LED surface illumination A3AT-91L1-00E@
Appearance Terminal Operation Illumination Model Color symbol for
pushbutton
Minimum
packing unit
Square/A3AA
Solder
Momentary Non-lighted A3AA-90A1-00@
(Non-lighted)
R (red)
Y (yellow)
G (green)
L (light gray)
A (blue)
B (black)
D (dark gray)
H (gray)
(Surface illumination)
R (red)
Y (yellow)
G (green)
100
LED surface illumination A3AA-90A1-00E@
Alternate Non-lighted A3AA-90B1-00@
LED surface illumination A3AA-90B1-00E@
PCB
Momentary Non-lighted A3AA-91A1-00@
LED surface illumination A3AA-91A1-00E@
Alternate Non-lighted A3AA-91B1-00@
LED surface illumination A3AA-91B1-00E@
Round/A3AT
Solder
Momentary Non-lighted A3AT-90A1-00@
LED surface illumination A3AT-90A1-00E@
Alternate Non-lighted A3AT-90B1-00@
LED surface illumination A3AT-90B1-00E@
PCB
Momentary Non-lighted A3AT-91A1-00@
LED surface illumination A3AT-91A1-00E@
Alternate Non-lighted A3AT-91B1-00@
LED surface illumination A3AT-91B1-00E@
Name Shape Classification Model Minimum
packing unit
Flange
Square
@12.7
Flange alone
Black A3A-241
100
Light gray A3A-242
Round
φ12.7
Black A3A-251
Light gray A3A-252
Leaf spring A3A-200
Square
@12.7 Flange and leaf
spring
(one each)
Black A3A-211
Light gray A3A-212
Round
φ12.7
Black A3A-221
Light gray A3A-222

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Specifications
■Approved Standards
UL (File No. E41515), CSA (File No. LR45258)
1a: 6 A at 125 VAC, 2 A at 250 VAC, 4 A at 30 VDC
1c: 3 A at 125 VAC, 2 A at 30 VDC
CCC (GB/T 14048.5)
1a: 6 A at 125 VAC, 2 A at 250 VAC, 4 A at 30 VDC
1c: 3 A at 125 VAC, 2 A at 30 VDC
■Ratings
Note: Minimum allowable load: 5 VDC 1 mA (Resistive)
The ratings given above are for testing under the following conditions:
(1) Ambient temperature: 20 ±2°C
(2) Ambient humidity: 65 ±5%RH
(3) Operating frequency: 20 times/minute
LED
Note: The above built-in LEDs do not have a resistor. Connect to each of the
above built-in LEDs a resistor that satisfies the above conditions.
* Refer to the VF– IFcharacteristic graphs on page 8.
■Operating Characteristics
* Alternate operation models only.
■Characteristics
*1. With alternate operation models, one operation cycle consists of set and
reset operations.
*2. Indicates malfunctions of less than 1 ms.
■Contact Form
Ty p e
Item AC resistive load DC resistive load
Contact form
General load 1a 6 A at 125 VAC
2 A at 250 VAC 4 A at 30 VDC
1c 3 A at 125 VAC 2 A at 30 VDC
Item
Illumination LED Surface Illumination
Red Ye l l o w Green
Forward voltage VF
Standard value (V) *
(IF= 10 mA) 2.0 2.1 2.1
Maximum value (V) 3.0
Forward current IFMaximum value (mA) 20 20 25
Permissible loss PD Maximum value (mW) 60 60 75
Reverse voltage VRMaximum value (V) 3
Operating force OF max. 2.45 N
Release force RF min. 0.15 N
To t a l t r av e l TT Approx. 2mm
Pretravel PT max. 1.5 mm
Locktravel alternate * LTA min. 0.5 mm
Operating
frequency
Mechanical Momentary action: 120 operations/minute max.
Alternate action: 60 operations/minute max. *1
Electrical 20 operations/minute max.
Insulation resistance 100 MΩmin.
(at 500 VDC with insulation tester)
Contact resistance
(initial value) 100 mΩmax.
Dielectric
strength
Between
terminals of
same polarity
600 VAC, 50/60 Hz for 1 min
Between
each terminal
and ground
2,000 VAC, 50/60 Hz for 1 min
Vibration
resistance Malfunction 10 to 55 Hz, 1.5-mm double amplitude *2
Shock
resistance
Destruction 500 m/s2max.
Malfunction 150 m/s2*2
Durability Mechanical
Momentary-operation model: 1,000,000 operations min.
Alternate-operation model: 50,000 operations min. *1
Electrical 50,000 operations min.
Weight Approx. 3.2 g
Ambient operating
temperature −10°C to +55°C (with no icing or condensation)
Ambient operating humidity 35% to 85%RH
Ambient storage
temperature −25°C to +65°C (with no icing or condensation)
Degree of protection IEC IP40
Electric shock protection
class Class II
PTI (proof tracking index) 175
Pollution degree 3 (IEC60947-5-1)
Contact name Contact form
SPST-NO
SPDT
COM NO
COM
NC
NO

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Nomenclature
■Model Structure
Note 1. The above is for the A3AA.
2.An A3A with solder terminals is provided with a black flange and leaf spring, however an A3A with PCB terminals is not provided with them. If a black flange
and leaf spring are required for an A3A with PCB terminals, order them from your OMRON representative. (Refer to page 2.)
<Pushbutton>
1. Shape
Square
(A3AA)
<Switch>
3. Ratings
Standard load (1a)
6 A at 125 VAC
2 A at 250 VAC
4 A at 30 VDC
Standard load (1c)
3 A at 125 VAC
2 A at 30 VDC
* Minimum applicable load:
1 mA at 5 VDC (resistive load)
2. Terminals
• Solder terminal
• PCB terminal
Round
(A3AT)
Diffusion sheet
(milky white)
4.Color cap
5. Color
• Non-lighted Model
Red , yellow, light gray ,
gray , dark gray ,
green , blue , black
• Surface Illumination Model
Red , yellow, green
Flange
Leaf spring

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Dimensions (Unit: mm)
Note: All units are in millimeters unless otherwise indicated.
The illustrations below show switches with solder terminals, without a flange or leaf spring.
Unless specified, there is a tolerance of ±0.4mm for dimensions.
12.7
15.2
8.9 dia.
Round push-button
Two, t0.4
terminals
@8.9
Square push-button
1.7
18
12.5 3.5
1
1.7
3.5
12.5
1
18
Three, t0.4
terminals
Non-lighted Model
Square Pushbutton
Round Pushbutton
SPST-NO SPDT
12.7
15.2
8.9 dia.
Round push-button
Two, t0.4 terminals
@8.9
Square push-button
1.7
18
12.5 3.5
1
Two, t0.3 LED terminals
1.7
3.5
12.5
1
18
Three, t0.4 terminals
Two, t0.3 LED terminals
LED Surface Illumination Models
Square Pushbutton
Round Pushbutton
SPST-NO SPDT

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■Terminals
Contact Solder terminal PCB terminal
SPST-NO
SPDT
0.5
0.8
2
0.5
0.8
23.5
1.7
1
0.8×2
3.5
1.7
1
10.16
4.48
NONO
10.16
LED
terminal
Terminal for models
with an illuminating
push-button
Non-lighted Models
Terminal Hole
Dimensions
Switch terminal: t0.4
LED Surface
Illumination Models
Switch terminal: t0.4
Lamp terminal: t0.3
3.5
0.6
1.7
1
3.5
0.6
1.7
1
Holes for models
with illuminating
push-button
10.16
10.16
4.48
(0.67)
(1.87)
Four,
1 dia.
holes
(2.52) (2.52)
＋−
10.16
4.48
NO NO
10.16
LED
terminal
Terminal for models
with an illuminating
push-button
Switch terminal: t0.4
Terminal Arrangement
(BOTTOM VIEW)
Switch terminal: t0.4
Lamp terminal: t0.3
Non-lighted Models
PCB Dimensions
(BOTTOM VIEW)
LED Surface
Illumination Models
0.5
0.8
2
0.5
0.8
2
0.8
1.7
1
3.5
0.8
1.7
1
3.5
1.95
5.7
10.16
LED
terminal
L+
NCNOC
L-
Non-lighted Models
Terminal Hole
Dimensions
Switch terminal: t0.4
LED Surface
Illumination Models Switch terminal: t0.4
Lamp terminal: t0.3
3.5
0.6
1.7
3.5
0.6
1.7
1.95
5.7
10.16
LED
terminal
L+
NC NO C
L-
(2.54) 10.16 NO
C
NC
1.95
5.7
Five,
1-dia.
holes
Holes for models
with illuminating
push-button
LED Surface
Illumination Models
Non-lighted Models
Switch terminal: t0.4
Terminal Arrangement
(BOTTOM VIEW)
Switch terminal: t0.4
LED terminal: t0.3
PCB Dimensions
(BOTTOM VIEW)

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■Accessories Dimensions
Note: Unless otherwise specified, a tolerance of ±0.4 mm applies to all dimensions.
■Panel Cutouts
7.8
12.7 dia.
9.1 dia.
11.6
(10.1) 5.4
1
1
12.7
9.1
7.8
11.6
(10.1) 5.4
1
1
12.2
15
13
2.5
t = 0.3
Leaf Spring A3A-200 Flange (Square) A3A-24@Flange (Round) A3A-25@
Square Pushbutton For Side-by-side Mounting Panel Mounting Dimensions
Round Pushbutton
11.5 dia.
11.5 dia.
11.5 dia.
+0.2
0
Square pushbutton Round pushbutton
Horizontal
multiple
mounting
Vertical
multiple
mounting
11.5
+0.2
−0
15.3 min.
3.8 min.
11.5
+0.2
−0
11.5
+0.2
−0
+0.3
−0
12.7(n−1)+11.5
15.3 min.
+0.2
−0
12.7 min.
+0.2
−0
14.5 max.
1
Flange
Panel *
Leaf spring
* Recommended panel
thickness: 1 to 1.6 mm
(The diagram shows the lighted
SPST-NO model.)
+0.2
0
11.5
+0.2
0
11.5

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Precautions
●Refer to the “Push-button Switches/Indicators Common Precautions” for correct use.
• Please do not perform wiring or touch
the charged parts of terminals while
power is supplied to the Switch.Doing
so may result in electric shock.
• Make sure to keep a secure insulation
distance after wiring to the Switch.
●Mounting
• When opening a hole on a panel to
mount an A3A to the panel, make sure
that the hole has no burr.
• When mounting a flange to the
switching mechanism of an A3A,
make sure that the flange and the
casing of the switching mechanism
are engaged securely.
●Wiring
• When soldering the terminals of an
A3A, refer to the following.
1. For manual soldering:
Use a soldering iron with the
terminals at a temperature of 350°C
maximum within three seconds.
2. Do not impose any external force on
the terminals for one minute after
the terminals are soldered.
• Do not pull the terminals of any A3A
with a force exceeding 5.34 N,
otherwise the joint part of the A3A may
be damaged.
• When soldering the terminals of an
A3A, apply non-corrosive rosin flux to
the terminals.
• After soldering the terminals of an
A3A, do not wash the A3A with any
solvent.
• When mounting an A3A to a PCB and
soldering the terminals of the A3A to
the PCB, make sure that the flux will
not rise above the surface of the PCB.
●Operating Environment
• When using an A3A, make sure that
dust, metal powder, or oil will not
penetrate into the interior of the A3A.
●LED
• The polarity of the LED is indicated on
the back of the Switch. Wire the LED
correctly according to the polarity.
• An A3A with a built-in LED does not
have a limiting resistor. Connect a
limiting resistor.
• The resistance can be calculated by
using the following expression.
Note: Make sure that the limiting resistor
connected to the built-in LED of an A3A
satisfies the characteristics of the built-in
LED. The mean forward current of the
built-in LED must be 8 mA minimum.
●Example
Conditions: Red LED with an IFof
–10 mA at 24 V and a Ta of 25°C.
From the red LED characteristic below,
VFwill be 2 V when IFis 10 mA.
Therefore, R = (24 V – 2 V)/0.01 A =
2,200 Ω.
Thus the recommended resistance is
2.2 kΩat 0.5 W (2* x IF2R).
Note: A factor of 2 (marked with an asterisk) is
applied because the permissible wattage of
the resistor must be twice as large as the
required wattage.
LED Characteristics
(VF – IF Characteristics)
Ta: Ambient Temperature
(Red)
(Yellow)
(Green)
●Pushbutton
• When exchanging the Pushbutton
(except the ones for the mechanical
indicator models) with a new one, pull
out the Pushbutton from the Switch,
holding the Pushbutton in the
longitudinal direction.
Do not remove the Pushbutton of the
mechanical indicator model.
●Engraving of Pushbutton
• Depth of engraving: 0.3 mm max. for
illuminating pushbutton
• Since the Pushbutton is made of
polycarbonate, use an alcohol-based
paint when marking legend.
●Pressing of Pushbutton
• Apply firm pressure to the Pushbutton
when operating it. In doing so,
however, do not apply a pressure
greater than 11.8 N.
Precautions for Correct Use
R = (Ω)
E : Applied
voltage (V)
VF: LED forward
voltage (V)
IF: LED forward
current (A)
E−VF
IF
50
20
10
5.0
2.0
0.1
0.2
0.5
1.0
1.0 1.5 2.0 2.5 3.0
VF (V)
IF
(mA) Ta = 25°C
50
20
10
5.0
2.0
0.1
0.2
0.5
1.0
1.0 1.5 2.0 2.5 3.0
VF (V)
IF
(mA) Ta = 25°C
Ta = 25°C
50
20
10
5.0
2.0
0.1
0.2
0.5
1.0
1.0 1.5 2.0 2.5 3.0
VF (V)
IF
(mA)

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■Installation
●Mounting and Replacing the Pushbutton
●Mounting Switch on a Panel
1. Mounting Direction for the
Pushbutton and Switch 2. Removing the Pushbutton (Non-lighted Models Only)
• Insert the catches of the Pushbutton into the
grooves of the Switch and push down on the
Pushbutton until it is fixed securely to the
Switch.
• With lighted models, the LED is built into the
Switch and cannot be replaced.
• To remove the Pushbutton, hold both the
Pushbutton and the Switch on the longer
sides and pull the Pushbutton away from the
Switch.
(If the catches on the Pushbutton are bent
outwards, it may result in malfunction.)
• When replacing the Pushbutton, if the cap is held
on the sides with catches, internal components
(e.g., plate) may come loose. Be sure to hold the
Pushbutton by the sides without catches (i.e., the
longer sides of the Switch) when removing.
Catches on the
Pushbutton
Grooves in
the Switch
LED terminals
Catch
1. Mount Leaf Spring 2. Mount Flange on Panel 3. Fit Flange with Switch 4. Removing Switch
• Press the leaf spring into the fitted
groove on the upper surface of the
Switch. For an easier fitting, first fit
one side of the leaf spring, then
press the other side into the fitting
groove.
(It will be easier mounting the leaf
spring of one side first, then mount
the other side.)
• Insert the flange from the front
surface of the panel.
• The flange has two opposing
guides to facilitate its insertion into
the panel cutout hole. Be sure the
flange does not remain tilted with
respect to the panel surface after
being installed.
• While holding the flange, insert the
opposing supports into the gaps
between the leaf spring and
Switch on the longer sides of the
housing, and fit the rectangular
hole of the flange with the
projections of the switch housing.
• Insert a small flat-bladed screwdriver
or tweezers into the flange support
exposed on the rear of the panel.
Pry up on each side to pull out the
Switch.
Note: Be sure to fit the leaf spring
exactly into the groove, and do
not allow it to slip out of the
groove.
Note: The mounting direction of the
flange determines the orientation
of the Switch.
Note: Completely remove any burrs on
the panel cutout surface;
otherwise, the flange and Switch
will not attach solidly.
Note: Do not pry up the flange support
more than necessary or the
switch holding portions may be
damaged.
Leaf spring
Leaf spring
fitting groove
Switch
Flange
Guide
Panel
Flange
Panel
(t = 1 to 1.6 mm)
Cross Section
Support
Panel
Projection
Panel Flat-bladed
screwdriver
or tweezers

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Please check each region's Terms & Conditions by region website.
OMRON Corporation
Electronic and Mechanical Components Company
Regional Contact
Cat. No. A025-E1-07
0322 (0207)
Americas Europe
https://components.omron.com/us-en/ https://components.omron.com/eu-en/
Asia-Pacific China
https://components.omron.com/sg-en/ https://components.omron.com.cn/
Korea Japan
https://components.omron.com/kr-en/ https://components.omron.com/jp-ja/
In the interest of product improvement, specifications are subject to change without notice.
© OMRON Corporation 2007-2022 All Rights Reserved.