Oder Information

      EC1102:     Model Type
S:                with Switch
E:                Bushing
5A:              Pulse and Detent Code
5A:   15 Pulse with 30 Detents
5B:   15 Pulse without Detent
4A:   20 Pulse with 20 Detents
4B:   20 Pulse without Detent
3A:    9 Pulse with 18 Detents
3B:    9 Pulse without Detents
XX:              Shaft type and Length  Code

Electrical Characteristics
Rated Power:                DC5V   5mA Max.
Output signal:               A \ B  2signals
Resolution:                  15 Pulses 360°
20 Pulses 360°
9 Pulses 360°
Phase difference:         0.08T  Min.
Sliding noise:                3mS   Max.
Contact Resistance:     1 Ω  Max.
Insulation resistance:  100MΩ Min. at DC 250V
Withstand voltage:      AC300V / 1 min

Mechanical
Total rotation angle:    360°
Rotational Torque:      20~200 gf.cm Max
Click Torque:               20~150 gf.cm
Push-pull Strength of Shaft:    8.0kgf Min.
Number of Detents:      30 detents Step angle:12°±2°
20 detents Step angle:18°±2°
18 detents Step angle:20°±2°
Without  detents
Rotational Life:            30000±200 cycles per 100gf.cm Min.
Temp. Range:               -30 ° C ~ + 80 ° C
Soldering:                   250 ° C   3Sec.  Max.