Ordering Information
■PUSHBUTTON UNITS
Lighted Switches
Round Rectangular Square
General Purpose and Micro-Voltage/Current
Load Switch
■Requires only 22 mm mounting depth
■All LEDs, lamps, legends and pushbutton units
replaceable without tools
■Oil-resistant version (satisfies IP65)
also available, making it ideal for
machine tools subject to oil splashes
Lighted Pushbutton Switch A3B
Part Number
Switch Type Degree of Sealing Color Round Rectangular Square
LED IP40 Red A3BT-500R A3BJ-500R A3BA-500R
Yellow A3BT-500Y A3BJ-500Y A3BA-500Y
Green* A3BT-500GY A3BJ-500GY A3BA-500GY
White A3BT-500W A3BJ-500W A3BA-500W
Oil-tight IP65 Red A3BT-510R A3BJ-510R A3BA-510R
Yellow A3BT-510Y A3BJ-510Y A3BA-510Y
Green* A3BT-510GY A3BJ-510GY A3BA-510GY
White A3BT-510W A3BJ-510W A3BA-510W
Incandescent IP40 Green* A3BT-500G A3BJ-500G A3BA-500G
Lamps Blue A3BT-500A A3BJ-500A A3BA-500A
Oil-tight IP65 Green* A3BT-510G A3BJ-510G A3BA-510G
Blue A3BT-510A A3BJ-510A A3BA-510A
* Note: With the exception of green, all pushbutton units can be used with either LED or incandescent lamps. To avoid an undesirable
hue change with green pushbutton units, use a green LED lamp with a green LED pushbutton and an incandescent lamp with
a green incandescent pushbutton.
2
A3B A3B
■PUSHBUTTON UNITS
Non-Lighted/Mushroom T ype Switches
Part Number
Switch Type Degree of Sealing Color Round Rectangular Square
Convex IP40 Red A3BT-502R A3BJ-502R A3BA-502R
Yellow A3BT-502Y A3BJ-502Y A3BA-502Y
Green A3BT-502G A3BJ-502G A3BA-502G
White A3BT-502W A3BJ-502W A3BA-502W
Blue A3BT-502A A3BJ-502A A3BA-502A
Black A3BT-502B A3BJ-502B A3BA-502B
Oil-tight IP65 Red A3BT-512R A3BJ-512R A3BA-512R
Yellow A3BT-512Y A3BJ-512Y A3BA-512Y
Green A3BT-512G A3BJ-512G A3BA-512G
White A3BT-512W A3BJ-512W A3BA-512W
Blue A3BT-512A A3BJ-512A A3BA-512A
Black A3BT-512B A3BJ-512B A3BA-512B
■LAMPS
Part Number
Type Color 5 VDC 12 VDC 24 VDC
LED Light Red A3B-005R A3B-012R A3B-024R
Yellow A3B-005Y A3B-012Y A3B-024Y
Green* A3B-005G A3B-012G A3B-024G
White A3B-005W A3B-012W A3B-024W
Incandescent Lamp 14 V 28 V
A3B-014 A3B-028
LED Incandescent
* Note: With the exception of green, all pushbutton units can be used with either LED or incandescent lamps. To avoid an undesirable
hue change with green pushbutton units, use a green LED lamp with a green LED pushbutton and an incandescent lamp with
a green incandescent pushbutton.
Note: 1. Can be used for both lighted and non-lighted units, except indicator.
2. Models A3BP and A3BK are available in micro-load and indication types.
3. These switch units usually are mounted with a nut. However, an optional leaf spring for snap-in mounting is also available.
4. The switch unit bears UL and CSA markings to indicate the standards by which the switch unit is recognized. The SEV marking
can also be marked on the switch unit if requested.
Part Number
Rectangular Square Round
Application
Contacts
Switch Action Terminal
Standard Large flange 3-dir. barrier Standard Standard
General- SPST -NO + Momentary Solder A3BJ-7011-1 A3BP-7011-1 A3BK-7011-1 A3BA-7011-1 A3BT-7011-1
purpose SPST-NC Alternate – A3BJ-7021-1 A3BP-7021-1 A3BK-7021-1 A3BA-7021-1 A3BT-7021-1
DPST -NO + Momentary – A3BJ-7031-1 A3BP-7031-1 A3BK-7031-1 A3BA-7031-1 A3BT-7031-1
DPST-NC Alternate – A3BJ-7041-1 A3BP-7041-1 A3BK-7041-1 A3BA-7041-1 A3BT-7041-1
Micro-load SPST -NO + Momentary Solder A3BJ-7111-1 A3BP-7111-1 A3BK-7111-1 A3BA-7111-1 A3BT-7111-1
SPST-NC PCB A3BJ-7112-1 A3BP-7112-1 A3BK-7112-1 A3BA-7112-1 A3BT-7112-1
Alternate Solder A3BJ-7121-1 A3BP-7121-1 A3BK-7121-1 A3BA-7121-1 A3BT-7121-1
PCB A3BJ-7122-1 A3BP-7122-1 A3BK-7122-1 A3BA-7122-1 A3BT-7122-1
DPST -NO + Momentary Solder A3BJ-7131-1 A3BP-7131-1 A3BK-7131-1 A3BA-7131-1 A3BT-7131-1
DPST-NC PCB A3BJ-7132-1 A3BP-7132-1 A3BK-7132-1 A3BA-7132-1 A3BT-7132-1
Alternate PCB A3BJ-7141-1 A3BP-7141-1 A3BK-7141-1 A3BA-7141-1 A3BT-7141-1
PCB A3BJ-7142-1 A3BP-7142-1 A3BK-7142-1 A3BA-7142-1 A3BT-7142-1
For indication (without switch unit) Solder M2BJ-7001-1 M2BP-7001-1 M2BK-7001-1 M2BA-7001-1 M2BT-7001-1
PCB M2BJ-7002-1 M2BP-7002-1 M2BK-7002-1 M2BA-7002-1 M2BT-7002-1
Rectangular Rectangular Rectangular Three- Square Round
Standard Large Flange Direction Barrier Standard Standard
■SWITCH UNITS
IP40 Cases
Round Rectangular Square
3
A3B A3B
IP65 Cases (Oil Tight)
Part Number
Rectangular Square Round
Application
Contacts
Switch Action Terminal
Standard Large flange 3-dir. barrier Standard Standard
General- SPST-NO + Momentary Solder A3BJ-7011-3 A3BP-7011-3 A3BK-7011-3 A3BA-7011-3 A3BT-7011-3
purpose SPST-NC Alternate Solder A3BJ-7021-3 A3BP-7021-3 A3BK-7021-3 A3BA-7021-3 A3BT-7021-3
DPST-NO + Momentary Solder A3BJ-7031-3 A3BP-7031-3 A3BK-7031-3 A3BA-7031-3 A3BT-7031-3
DPST-NC Alternate Solder A3BJ-7041-3 A3BP-7041-3 A3BK-7041-3 A3BA-7041-3 A3BT-7041-3
Micro-load SPST-NO + Momentary Solder A3BJ-7111-3 A3BP-7111-3 A3BK-7111-3 A3BA-7111-3 A3BT-7111-3
SPST-NC PCB A3BJ-7112-3 A3BP-7112-3 A3BK-7112-3 A3BA-7112-3 A3BT-7112-3
Alternate Solder A3BJ-7121-3 A3BP-7121-3 A3BK-7121-3 A3BA-7121-3 A3BT-7121-3
PCB A3BJ-7122-3 A3BP-7122-3 A3BK-7122-3 A3BA-7122-3 A3BT-7122-3
DPST-NO + Momentary Solder A3BJ-7131-3 A3BP-7131-3 A3BK-7131-3 A3BA-7131-3 A3BT-7131-3
DPST-NC PCB A3BJ-7132-3 A3BP-7132-3 A3BK-7132-3 A3BA-7132-3 A3BT-7132-3
Alternate Solder A3BJ-7141-3 A3BP-7141-3 A3BK-7141-3 A3BA-7141-3 A3BT-7141-3
PCB A3BJ-7142-3 A3BP-7142-3 A3BK-7142-3 A3BA-7142-3 A3BT-7142-3
For indication (without switch unit) Solder M2BJ-7001-3 M2BP-7001-3 M2BK-7001-3 M2BA-7001-3 M2BT-7001-3
PCB M2BJ-7002-3 M2BP-7002-3 M2BK-7002-3 M2BA-7002-3 M2BT-7002-3
Note: 1. Can be used for both lighted and non-lighted pushbutton units, except indicator.
2. Models A3BP and A3BK are available in micro-load and indication types.
3. These switch units usually are mounted with a nut. However, an optional leaf spring for snap-in mounting is also available.
4. The switch unit bears UL and CSA markings to indicate the standards by which the switch unit is recognized. The SEV marking
can also be marked on the switch unit if requested.
■ACCESSORIES
Part Remarks Classification Part Number
Socket Cannot be used with insulation cover. Wire-wrap terminal A3B-4101
PCB terminal A3B-4102
Solder terminal A3B-4103
■ACCESSORIES
Socket Switch Guard Dust Cover Snap-in Mounting Insulation Panel Plug Tightening Tool Extractor Legend Plate
Leaf Spring Cover
Part Number
Part Remarks Round Rectangular Square
Switch Guard Cannot be used with protective dust cover. A3BT-5050 A3BJ-5050 A3BA-5050
Cannot be used for A3BP switch unit.
Protective Dust Cover Cannot be used with switch guard. A3BT-5060 A3BJ-5060 A3BA-5060
Cannot be used for A3BP switch unit.
Snap-in Mounting Cannot be used with mounting nut. A3B-3001
Leaf Spring
Insulation Cover Cannot be used with socket. A3B-3002
Panel Plug To reserve a hole cutout on a panel for future mounting. A3BT-3003 A3BJ-3003 A3BA-3003
Tightening Tool Convenient for ganged installation. Do not overtighten. A3B-3004
Extractor Aids in getting a non-slip grip when removing keytops. A3PJ-5080
Part Number
Part Remarks Type Opacity Round Rectangular Square
Legend Panel A single legend plate Dust Proof White A3BT-5201 A3BJ-5201 A3BA-5201
is included with the IP40 Transparent A3BT-5202 A3BJ-5202 A3BA-5202
standard unit. Oil-resistant Transparent A3BT-5203 A3BJ-5203 A3BA-5203
IP65
4
A3B A3B
Specifications
■CONT ACT RA TINGS
Type AC Resistant Load DC Resistant Load
General purpose load 0.5 A, 250 VAC 1A, 30 VDC
1 A, 125 VAC
Micro-voltage/current load 0.1 A, 125 VAC 0.1 A, 30 VDC
Note: The minimum applicable load is 1 mA at 5 VDC.
■LED RATINGS
Rated Voltage Rated Current Operating Voltage
5 VDC 30 mA 5 VDC ± 5%
12 VDC 15 mA 12 VDC ± 5%
24 VDC 10 mA 24 VDC ± 5%
■LAMP RATINGS
Rated Voltage Rated Current Operating Voltage
14 V 40 mA 12 V
28 V 24 mA 24 V
■APPROVALS
Note: All switch models listed have a built-in current limiting resistor (for use with LED).
UL (File No. E41515) / CSA (File No. LR45258)
Type Rating
General purpose load 3 A, 250 VAC
5 A, 125 VAC
1 A, 30 VAC
Micro-voltage/current load 0.1 A, 125 VAC
0.1 A, 30 VDC
SEV (File No. D2.21/407)
Type Rating
— 5 A, 250 VAC
Note: The rated values approved by each of the safety standards (e.g. UL, CSA) may be different from the performance
characteristics individually defined in this catalog.
5
A3B A3B
Characteristics
Operating frequency Mechanical Momentary action type: 120 operations per minute max.
Alternate action type: 60 operations per minute max.
Electrical 20 operations per minute max.
Insulation resistance 100 MΩ min. (at 500 VDC)
Contact resistance General type 50 MΩ max. 6-8 VDC at rated current or 1A
Micro-load type 100 MΩ max. 6-8 VDC/0.1A
Dielectric strength 1,000 VAC, 50/60 Hz for 1 minute between terminals of same polarity
2,000 VAC, 50/60 Hz for 1 minute between terminals of different polarity and also
between each terminal and ground
Vibration Mechanical/ 10 to 55 Hz, 1.5 mm double amplitude
malfunction durability
Shock Mechanical durability 500 m/s2 approx. (50 G)
Malfunction durability 50 m/s2 approx. (15 G)
Ambient temperature Operating -10° to 55° C
Humidity 35% to 85% RH
Service life Mechanical Momentary action type: 1,000,000 operations per min.
Alternate action type: 100,000 operations per min.
Electrical See “Characteristic Data”
Weight (see note) Approx. 7 g
Note: The weight indicated is for the lighted type (DPST-NO + DPST-NC).
■CHARACTERISTIC DA T A
Applicable load range Electrical service life
Note: The load range shown above is applicable only during the standard conditions.
■OPERATING CHARACTERISTICS
A3B■■-7■■■■■■-1 A3B■■-7■■■■■■-3
SPST-NO DPST-NO SPST-NO DPST-NO
++++
Contacts SPST-NC DPST-NC SPST-NC DPST-NC
Operating force (OF) max. 250 g 350 g 400 g 500 g
Releasing force (RF) min. 30 g 30 g 30 g 30 g
Total Travel (TT) Approx. 3.5 mm Approx. 3.5 mm Approx. 3.5 mm Approx. 3.5 mm
Pretravel (PT) max. 2.5 mm 2.5 mm 2.5 mm 2.5 mm
Lock stroke (LTA) min. (see note) 0.5 mm 0.5 mm 0.5 mm 0.5 mm
Note: LTA denotes the distance from the free position (FP) to where the actuator locks after it reaches the operating position (OP).
Current (mA) Switching Current (A)
Operations (x 104)
Voltage (VDC)
Zone 0 Zone 1 Zone 2 Zone 3 Zone 4
5 mW 0.1W 0.2W 0.3W
012345
0.1 0.16 0.5 1 5 10 50 100 500
125 VAC resistive load p.f. = 1
250 VAC resistive load p.f. = 1
10
1
0.1
10
10
5
General purpose and
high capacity load
Micro voltage/current load
6
A3B A3B
Dimensions
■SWITCH UNITS
The following dimensions are applicable to the switch units with solder terminals and SPST-NO+SPST-NC contact configuration:
Unit: mm (inch)
A3BA (M2BA), with standard pushbutton unit* Panel cutout (top view)
A3BJ (M2BJ), with standard pushbutton unit* Panel cutout (top view)
(for mounting switch unit only)
Note: 1. Unless otherwise specified, a tolerance of ± 0.4 mm applies to all dimensions.
2. Recommended panel thickness is 1.0 to 3.2 mm.
3. Use sockets when mounting many switch units in a matrix.
* Use an optional leaf spring to snap-in mount
the switch unit. At this time, the panel cutout
changes to 16.2 dia + 0.3, -0 mm.
* Use an optional leaf spring to snap-in mount
the switch unit. At this time, the panel cutout
changes to 16.2 dia + 0.3, -0 mm.
7
A3B A3B
A3BT (M2BT), with standard pushbutton unit* Panel cutout (top view)
* Use an optional leaf spring to snap-in mount
the switch unit. At this time, the panel cutout
changes to 16.2 dia + 0.3, -0 mm.
A3BP, with large flange pushbutton unit* Panel cutout (top view)
* A switch guard and dust-protective cover
cannot be attached.
Note: 1. Unless otherwise specified, a tolerance of ± 0.4 mm applies to all dimensions.
2. Recommended panel thickness is 1.0 to 3.2 mm.
3. Use sockets when mounting many switch units in a matrix.
8
A3B A3B
A3BK, with 3-direction pushbutton unit Panel cutout (top view)
A3BJ, with mushroom pushbutton unit Panel cutout (top view)
Note: 1. Unless otherwise specified, a tolerance of ± 0.4 mm applies to all dimensions.
2. Recommended panel thickness is 1.0 to 3.2 mm.
3. Use sockets when mounting many switch units in a matrix.
Unit: mm (inch)
9
A3B A3B
A3BA, with mushroom pushbutton unit Panel cutout (top view)
A3BT, with mushroom pushbutton unit Panel cutout (top view)
Note: 1. Unless otherwise specified, a tolerance of ± 0.4 mm applies to all dimensions.
2. Recommended panel thickness is 1.0 to 3.2 mm.
3. Use sockets when mounting many switch units in a matrix.
10
A3B A3B
■SOLDER TERMINALS
SPST-NO+SPST-NC DPST-NO+DPST-NC Indicator
Lighted type Lighted type
Dimensions of terminal holes Dimensions of terminal holes Dimensions of terminal holes
Terminal arrangement Terminal arrangement Terminal arrangement
(bottom view) (bottom view) (bottom view)
Unit: mm (inch)
11
A3B A3B
■PCB TERMINALS
SPST-NO+SPST-NC DPST-NO+DPST-NC Indicator
Lighted/Non-lighted type Lighted/Non-lighted type
Terminal arrangement Terminal arrangement Terminal arrangement
(bottom view) (bottom view) (bottom view)
Mounting hole Mounting hole Mounting hole
(bottom view) (bottom view) (bottom view)
Note: 1. Unless otherwise specified, a tolerance of ± 0.4 mm applies to all dimensions.
2. Recommended panel thickness is 0.6 mm.
3. The materials used in the switches are polycarbonate resin in products satisfying P40, and polyarirate resin in products satisfying
P65.
A3BJ A3BA A3BT
■LEGEND PLATE
12
A3B A3B
Wire-wrap terminal PCB terminal Solder terminal
Mounting hole Terminal hole
(bottom view)
Note: When mounting the socket, the side of the socket groove is the L+ terminal side.
■WITH INSTALLED SWITCH GUARD
Rectangular Panel cutout Square, Round Panel cutout
■WITH SOCKET MOUNTED
(The following dimensions are applicable to the rectangular type.)
Unit: mm (inch)
13
A3B A3B
■WITH MOUNTED DUST COVER
Round Panel cutout Tightening tool
A3B-3004
14
A3B A3B
After mounting the switch unit on a panel, and after tightening the
mounting nut, insert the lead wires into the hole on the insulation
cover before wiring. Align the insulation cover so that the
cylindrical portion of the insulation cover will face the switch unit.
This means that the lead wires will be inserted from the barrier side
of the insulation cover. After wiring has been completed, slide the
insulation cover over the switch unit.
■WITH ATTACHED INSULATION COVER
(The following dimensions are applicable to the rectangular
pushbutton unit.)
Rectangular Square Round
Assembly/Disassembly
■MOUNTING AND REPLACING THE
PUSHBUTTON UNIT
■PANEL PLUG
Select the panel plug which best
compliments the design of the
mounting panel. The dimensions of
the hole cutout for the panel plugs are
the same as those of the switch unit.
Mounting directions of the LED/lamp and pushbutton unit
The Omron pushbutton unit doubles the roles in which a
pushbutton switch is normally used. The pushbutton unit may be
inserted one of two ways:
(2) For operation as an indicator unit:
Insert the LED/lamp guide into the narrower opening
in the indicator's receptacle.
(1) For operation as a lighted pushbutton switch:
Fit the LED/lamp so that its guide projection is inserted into
the wider opening in the receptacle of the pushbutton unit.
15
A3B A3B
■REMOVING THE PUSHBUTTON UNIT
With your thumb and forefinger, while holding the recessed
portions on both sides, firmly and steadily pull out the top of the
pushbutton unit.
Pulling out the cap with pliers or a similar tool will damage the cap.
■SNAP-IN MOUNTING
• Fit the spring mounting clip for snap-in mounting
to the switch unit.
• Insert the tab of the spring mounting clip into the
two grooves on the threaded part of the switch
unit.
• Be sure to use the two spring mounting clips.
Ensure that each tab is firmly inserted onto the
grooves.
• Do not use the spring mounting clips for the
switch unit conforming to IP65. The rubber seal
may not be held in close enough contact to
prevent the inflow of liquid. Use a nut to secure
the switch.
• Insert the switch unit from the front of the panel,
and push until you hear the clips snap into place.
■SOCKET MOUNTING
• After mounting the switch unit on the panel, secured by the
mounting nut, attach the socket to the switch unit.
• In doing so, make sure that the projection on the switch unit fits
in the positioning hole (at the wider side) of the socket.
■NUT MOUNTING
• Insert the switch unit from the front of the panel (a rubber seal is
provided for the IP65 type only) and tighten the mounting nut
inserted from the rear of the panel.
• Since a projection exists on the rear portion of the switch unit, if
the mounting nut cannot be fitted into position, turn the nut
slightly.
• The tightening torque of the mounting nut should be less than
5kg-cm.
• Solder the terminals after mounting the nut. Otherwise, the
terminals when thickened by solder, may prevent the nut from
being screwed down onto the switch unit.
Hints on Correct Use
Refer to HINTS ON CORRECT USE under the General Information section.
Mounting
16
A3B A3B
OMRON ELECTRONICS, INC. OMRON CANADA, INC.
One East Commerce Drive 885 Milner Avenue
Schaumburg, IL 60173 Scarborough, Ontario M1B 5V8
1-800-55-OMRON 416-286-6465
Cat. No. GC SW5 4/98 Specifications subject to change without notice. Printed in the U.S.A.
