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Key-type Selector Switch (Detachable) (Cylindrical 16-dia.)


Separate Construction with Cylindrical 16-dia. Body

Approved Standard Ratings

UL, cUL (File No. E41515)

5 A at 125 VAC, 3 A at 250 VAC (general use)
3 A at 30 VDC (resistive)
Note: Certification has been obtained for the Switch Unit.
           For detailed information on individual products that have received certification, consult your supplier.

TÜV (EN60947-5-1) (Low Voltage Directive)

3 A at 250 VAC
3 A at 30 VDC

CCC (GB/T14048.5)

5 A at 125 VAC
3 A at 250 VAC
3 A at 30 VDC



Rated voltage Resistive load
125 VAC 5A
250 VAC 3A
30 VDC 3A

Minimum applicable load: 1 mA at 5 VDC
Rated values are obtained from tests conducted under the following conditions.
  1. Load: Resistive load
  2. Mounting conditions: No vibration and no shock
  3. Temperature: 20±2°C
  4. Operating frequency: 20 times/min

Contact Form

Name Contact form


Socket Units

Type Key-type Selector Switch
Mechanical 20 operations/minute max.
Electrical 10 operations/minute max.
Insulation resistance 100 MΩ min. (at 500 VDC)
Contact resistance 100 mΩ max. (intial value)
Between terminals of same
1,000 VAC, 50/60 Hz for 1 minute
Between terminals of different
2,000 VAC, 50/60 Hz for 1 minute
Between each terminal and
2,000 VAC, 50/60 Hz for 1 minute
Malfunction 10 to 55 Hz, 1.5-mm double amplitude (malfunction within 1 ms)
Destruction 500 m/s2 max.
Malfunction 150 m/s2 max. (malfunction within 1 ms)
Durability Mechanical 250,000 operations min. (durability of key: 10,000 operations min.)
Electrical 100,000 operations min.
Electric shock protection class Class II
PTI (tracking characteristic) 175
Degree of contamination 3 (IEC60947-5-1)
Weight Approx. 26.5 g (in the case of a DPDT switch key)
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)

Screw-less Clamp

Item Type Screw-less Clamp
Recommended wire size 0.5 mm2 twisted wire or 0.8 mm-dia. solid wire
Usable wires and tensile strength Twisted wire 0.3 mm2 0.5 mm2 0.75 mm2 1.25 mm2
Solid wire 0.5 mm dia. 0.8 mm dia. 1.0 mm dia. ---
Tensile strength 10 N 20 N 30 N 40 N
Length of exposed wire 10 ± 1 mm
Compliant standards JIS C 2811 Terminal Blocks for Industrial Use

Operating Characteristics

Type Key-type Selector Switch
Characteristics 2 notches 3 notches
Operating torque (OF) max. 0.1 Nm
Set position (SP) 90 ± 5 ° 45° +10, 0

Operation Angle

A165K Specifications 13

Note: The angle used for automatic reset is shown in parentheses.
          FP: Free position

Contact Configuration

A165K Specifications 14

No. of notches Contact configuration
Position SW Position SW2 SW1
2 notches 1103_sp_7_1 1103_sp_7_4 1103_sp_7_1 1103_sp_7_4 1103_sp_7_4
1103_sp_7_2 1103_sp_7_5 1103_sp_7_2 1103_sp_7_5 1103_sp_7_5
3 notches --- 1103_sp_7_1 1103_sp_7_5 1103_sp_7_4
1103_sp_7_3 1103_sp_7_4 1103_sp_7_4
1103_sp_7_2 1103_sp_7_4 1103_sp_7_5