24mm Square Panel Seal Pushbuttons
BALLAST RESISTOR CALCULATION FOR LEDS
Series YB2
If the source voltage is greater than the rated voltage of
a lamp or LED, a ballast resistor must be connected in
series with the lamp. This circuit diagram and formula
will assist in calculating the value of the required ballast
resistor.
E
R
+
I F
V F
Anode
Cathode
R =
Where: R =
E =
V F =
I F =
E – V F
I F
Resistor Value (Ohms)
Source Voltage (V)
Forward Voltage (V)
Forward Current (A)
CAPS & CAP COLORS
AT3025 Cap for
Illuminated
Lens/Diffuser Colors Available:
AT3027 Cap for
Nonilluminated
Cap Color Available:
JB
Clear/White
For Bright & Superbright LEDs
S
Metallic Silver
CB
Red/White
For Bright LED only
(18.0) Sq
.709
Note: AT3025 Cap can also be
used without illumination.
(18.0) Sq
.709
EB
* Yellow/White
For Bright LED only
(4.9)
.193
(13.1)
.516
(4.9)
.193
(13.1)
.516
FB
Green/White
For Bright LED only
* Yellow cap
pairs with amber LED
to achieve amber illumination.
Material for Lens & Diffuser: Polycarbonate
TYPICAL SWITCH DIMENSIONS
Single Pole
Double Pole
M16 P1
(1.2) x (2.0) Typ
.047 x .079
(0.5) Typ
.020
(3.7)
.146
(2.8)
.110
(9.7)
.382
(3.7)
.146
(2.8)
.110
(9.7)
.382
(2.8) Typ
.110
(18.0) Sq
.709
(24.0) Sq
.945
(1.8)
.071
(24.5)
.965
(33.6)
1.323
(7.3)
.288
(3.0)
.118
(5.55)
.219
(6.0)
.236
(11.1)
.437
YB216CWSKW01-6F-JB
PANEL THICKNESS & CUTOUT
.965 Typ
(24.5)
Panel Thickness
.020” ~ .197”
(0.5mm ~ 5.0mm)
.827 Typ + 0 .012 (0.3)
(21.0)
Side-by-side Mounting
www.nkk.com
7
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