Encoder
20mm Size Metal Shaft Type
EC20A/RK203
Series
Heavy torque and comfortable operation feel with compliance to encoder and
potentiometer applications.
Detector
Push
Rating
Slide
Operating life
Rotary
Encoders
30,000cycles
Typical Specifications
Items
Specifications
Encoder
Potentiometer
1mA 5V DC
0.05W
Product Line
Power
Dual-in-line
Package Type
TACT Switch
TM
Custom-
Products
Encoders
Detent
Length of
Number
Operating
operating section torque
of detent
section
・
（mm） （mN
m）
Flat
Potentiometer
30
40±20
18
Number
of pulse
18
Operating
direction
Vertical
Travel of
push-on switch
（mm）
1.5
Minimum
order unit
（pcs.）
400
Product No.
EC20A1824401
EC20A1820401
Drawing
No.
1
2
Detent
Length of
Number
Operating
operating section torque
of detent
section
・
（mm） （mN
m）
Flat
30
Shall be in accordance with individual specifications
Rotational
angle
240°max
Operating
direction
Vertical
Minimum order unit
（pcs.）
400
Product No.
RK203110
Drawing
No.
3
Notes
1. For with switch type, only the incremental type is available.
2. All the potentiometer types can be customized. Contact us with the detailed specifications if you have such requirements.
Dimensions
Incremental
Type
Absolute
Type
No.
Photo
EC20A
with push-on switch
（travel
1.5mm）
Incremental Type
1
Style
Unit:mm
PC board mounting hole dimensions
（Viewd
from mounting face）
4.5
¿6
3.5
Mounting
surface
2.5
10
10
30
12
Switch travel
1.5
¿20.2
5
D
1.5
1.25
3.75
6.25
18.4
8.3
19.2
2.6
1.5
3.5
M9
G
0.75
1.5
C1
E
7
A C B NC NC NC
¿3
15.5
ACB
(17.8)
ø20.2
ACB
5п1.2 holes
3Ð1
D
EC20A
without switch type
Incremental Type
3.5
Mounting
Surface
2.5
8
10
E
30
12
18.4
2.6
M9G0.75
A
1.5
1.25
3.75
1.5
2
3.5
1.5
A C B NC NC NC
ø3
15.5
B
C
3-1
(17.8)
6.25
4.5
¿6
2.5
3
3.5
M9
×
0.75
1.5
NC 2 NC 1 NC 3
1.5
15.5
¿3
1.5
2 1 3
10
3-¿1.2holes
C1
8.3
9
19.2
2.6
RK203
without switch type
Potentiometer Type
3.5
Mounting
Surface
8
10
30
12
¿20.2
18.4
3.75
3-1
(17.8)
190
9
1.25
6.25
10
3-¿1.2 holes
C1
8.3
9
19.2
4.5
ø6
9
10
9
9
ALPS [ ALPS ELECTRIC CO.,LTD. ]
