A3A Lighted Pushbutton Switch

Specifications
Contact Ratings

Item Type Contact form		Resistive load
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

Note:	1.	Minimum allowable load: 5 VDC 1 mA (Resistive)
	2.	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 Ratings

Illumination Item		LED Surface Illumination
		Red	Yellow	Green
Forward voltage VF	Standard value	2.0 V	2.1 V	2.1 V
	Maximum value	3 V
Forward current IF	Maximum value	20 mA	20 mA	25 mA
Permissible loss PD	Absolute max. value	60 mW	60 mW	75 mW
Reverse voltage VR	Absolute max. value	3 V

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.

Characteristics

Operating frequency	Mechanical:   Momentary action: 120 operations/minute max.   Alternate action: 60 operations/minute max. (See note 1.) Electrical: 20 operations/minute max.
Insulation resistance	100 MΩ min. (at 500 VDC with insulation tester)
Contact resistance (initial value)	100 mΩ max.
Dielectric strength	600 VAC, 50/60 Hz for 1 min between terminals of same polarity 2,000 VAC, 50/60 Hz for 1 min between each terminal and ground 600 VAC, 50/60 Hz for 1 min between LED terminals (See note 2.)
Vibration resistance	Malfunction: 10 to 55 Hz, 1.5-mm double amplitude (See note 3.)
Shock resistance	Destruction: 500 m/s2 max. Malfunction: 150 m/s2 (See note 3.)
Durability	Mechanical:   Momentary-operation model: 1,000,000 operations min.   Alternate-operation model: 50,000 operations min. (See note 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)

Note:	1.	With alternate-action models, a setting and resetting is regarded as one operation.
	2.	The figure for the dielectric strength between LED terminals in the above table is for when the LED is not installed in the Switch.
	3.	The figures for malfunctions in the above table are for malfunctions of at least 1 ms.

Contact Form

Contact name	Contact form
SPST-NO
SPDT

Dimensions
(Unit: mm)

Note:	1.	All units are in millimeters unless otherwise indicated.
	2.	The illustrations below show switches with solder terminals, without a flange or leaf spring.
	3.	Unless specified, there is a tolerance of ±0.4mm for dimensions.

Non-lighted Model
Square Pushbutton


Round Pushbutton


LED Surface Illumination Models
Square Pushbutton


Round Pushbutton


Terminals

	Solder terminal	PCB terminal
SPST -NO
SPDT

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 insulationdistance 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.

●Example

Conditions: Red LED with an IF of -10 mA at 24 V and a Ta of 25°C. From the red LED characteristic below, VF will be 2 V when IF is 10 mA. Therefore, R = (24 V - 2 V)/0.01 A = 2,200 Ω. Thus the recommended resistance is 2.2 kΩ at 0.5 W (2* x IF2R).

●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.