Selector Switch 3 Pos
Selector Switch 3 Pos
Blog Article
3-Position Selector Switch – Complete Guide
A 3-position selector switch is a rotary or toggle switch used to control machinery, automation systems, or electrical circuits by selecting between multiple operating modes (e.g., Manual/Auto/Off, Forward/Neutral/Reverse, or Speed Selection).
Key Features
1. Switch Types
Rotary Selector (Knob-operated, common in industrial panels).
Toggle Selector (Lever-style, compact designs).
Key-Lock Selector (Prevents unauthorized changes).
2. Contact Configurations
1NO/1NC (Single-circuit control).
2NO/2NC (Dual-circuit redundancy).
Maintained vs. Spring-Return (Stays in position or auto-resets).
3. Positions & Functions
On-Off-On (Two active modes + center off).
Auto/Manual/Off (Common in control panels).
Forward/Stop/Reverse (Motor control).
4. Electrical Ratings
Voltage: 24V DC, 120V AC, 240V AC, etc.
Current: Typically 5A–10A (check datasheet).
5. Enclosure & Protection
IP65/IP67 (Dust/water-resistant).
Metal or Plastic Housing (Industrial vs. light-duty use).
Common Applications
✔ Motor Control (Forward/Reverse/Stop).
✔ Machine Mode Selection (Auto/Manual/Off).
✔ Lighting Control (High/Medium/Low).
✔ Safety Circuits (Bypass/Test/Run).
Wiring Diagrams
1. On-Off-On (Single Circuit)
Terminals:
L1 (Common) → Input power.
T1 (Position 1) → Output 1 (e.g., Forward).
T2 (Position 2) → Output 2 (e.g., Reverse).
2. Auto/Manual/Off (Dual Circuit)
Terminals:
L1, L2 → Power inputs.
T1, T2 → Auto mode outputs.
T3, T4 → Manual mode outputs.
Top Brands & Models
| Brand | Model Example | Key Feature |
|---|---|---|
| Allen-Bradley | 800T-J2K | 3-Pos, maintained, 10A @ 600V |
| Siemens | 3SU1-1BA30-1AA0 | Rotary, IP65, 2NO/2NC |
| Omron | A22S-3M-01 | Metal knob, 5A @ 250V AC |
| Schneider Electric | XB4-BA33 | Toggle, 3-pos, 4A @ 24V DC |
Where to Buy?
Industrial Suppliers: RS Components, AutomationDirect, Grainger.
Online: Amazon, eBay (search for *"3-position selector switch"*).https://store.unigulfsupply.com/product/selector-switch-db2-bd33/