Selector Switch Pakistan: Rotary 2-3-4 Position
Selector Switch Pakistan 2026 — Rotary 2, 3, 4 Position Wiring & Use Cases
Updated: May 2026 · CNC Electric Pakistan
Selector Switch — Pakistan Quick Answer (2026)
A selector switch is a 22 mm panel-mount rotary switch with 2, 3, or 4 fixed positions used for HAND/OFF/AUTO mode selection, motor direction (FWD/REV), source selection, or ammeter range. Pakistan 2026 prices: CNC LAY5 2-position from Rs.380, 3-position maintained or spring-return Rs.480, key-operated lockable selector Rs.650, illuminated selector with LED indicator Rs.780. Mounts in the same 22.5 mm panel hole as any push button.
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Selector Switch vs Push Button
Push buttons are momentary — contacts change state only while pressed. Selector switches are maintained — the rotary handle stays in whichever position it was last left, until manually turned. That single difference defines when each is used:
- Push button → actions: START, STOP, PRIMING, RESET, LAMP TEST
- Selector switch → modes: HAND/OFF/AUTO, FORWARD/OFF/REVERSE, GENSET/MAINS, A-PHASE/B-PHASE/C-PHASE for ammeter
A control panel uses both — selector switches choose what the machine should DO, push buttons trigger the actual action.
Position Counts — 2, 3, 4 Position Variants
2-Position (ON/OFF · I/O)
The simplest selector. Handle rotates through 90° between two positions. One pair of contacts opens or closes per rotation. Used as a maintained on/off switch for circuits where you want a positive "is it on or off" indication that doesn't reset on power loss.
- CNC LAY5 2-position — Rs.380
- Common contact configurations: 1NO, 2NO, 1NO + 1NC
3-Position Maintained (I-0-II · HAND/OFF/AUTO)
The HAND/OFF/AUTO workhorse. Three positions, handle stays where you put it. Standard for motor starters, pump panels, lighting controls — anywhere you want a "manual mode / off / automatic mode" choice.
- CNC LAY5 3-position maintained — Rs.480
- Each position can have independent NO contacts that close only in that position
3-Position Spring-Return (Centre OFF)
Same 3 positions but with a spring that returns the handle to the centre when released. Used for momentary commands like JOG FORWARD / OFF / JOG REVERSE, RAISE / OFF / LOWER for actuators.
- CNC LAY5 3-position spring-return — Rs.520
4-Position (I-II-III-IV)
Less common but used for source selection (mains / gen 1 / gen 2 / solar), ammeter phase selection (R / Y / B / OFF), or PLC mode (PROG / RUN / TEST / OFF).
- CNC LAY5 4-position — Rs.620
Key-Operated Selectors
Same form factor but requires a removable key to rotate. Used for security applications — operator key for HAND mode, supervisor key for AUTO mode. Common on industrial machinery for safety lockout.
- CNC LAY5 key-operated 2-position — Rs.650
- CNC LAY5 key-operated 3-position — Rs.780
HAND/OFF/AUTO Pattern — The Standard Pakistani Motor Starter
Probably the single most common use of a selector switch in Pakistani factories and pump installations. The wiring:
- HAND position closes contacts that wire the motor START signal directly to operator push buttons. Operator manually controls start/stop with the green/red buttons.
- OFF position opens all motor control circuits — motor cannot start, period.
- AUTO position closes contacts that route the motor START signal from a PLC, level switch, thermostat, or other external automation. Operator buttons are bypassed.
Why this pattern matters: during commissioning, the operator uses HAND to bump the motor and confirm rotation direction. During normal operation, the selector goes to AUTO and the PLC takes over. During maintenance, OFF positively isolates the motor from any inadvertent start signal.
Wiring a 3-Position Selector — Schematic Logic
The selector's contact block has multiple stations. Each station has terminals that close ONLY when the handle is in a specific position. A typical 3-position contact block has:
- Position I (HAND) — NO terminal: closes in I, opens in 0 and II
- Position II (AUTO) — NO terminal: closes in II, opens in 0 and I
- Centre 0 (OFF) — by convention has no contact assigned (both NOs open)
In a motor starter, the HAND NO contact feeds the operator's START push button into the contactor coil circuit. The AUTO NO contact feeds the PLC's START signal into the same coil. Both terminate at the same contactor coil; they just have different upstream sources.
Selector Switch + Contactor + Push Button — Complete Schematic Pattern
A complete HAND/OFF/AUTO motor starter with all three control elements:
- Supply: 220 V control supply (often tapped from one phase of the motor circuit through a small control transformer or fuse).
- STOP button (NC): in series with the contactor coil — always-closed safety break.
- From selector switch HAND position NO contact: feeds the START push button (NO), which energises the coil.
- From selector switch AUTO position NO contact: feeds the PLC's "motor on" output, which energises the coil.
- Contactor seal-in (auxiliary NO): wired across the START button, keeps the coil energised after the START is released.
- Coil: drives the main contactor that switches the motor.
Add a red emergency stop mushroom NC in series with the STOP button for safety-compliant installations.
Pakistani Application Examples
Borewell Tube Well Controller
Selector: HAND / OFF / AUTO. HAND for operator manual prime + run. OFF for maintenance. AUTO routes the start signal from a tank float switch — pump runs when tank is low, stops when full. Standard Punjab agricultural installation.
Lift / Elevator Panel
Selector: NORMAL / FIREMAN / MAINTENANCE. NORMAL is everyday public use. FIREMAN locks the lift to ground floor and disables public buttons (key-operated for safety). MAINTENANCE puts the lift in inspection mode for technicians.
Generator Control Panel
Selector: MANUAL / OFF / AUTO. MANUAL allows operator to start/stop the genset locally. OFF locks out. AUTO accepts the start signal from your ATS (auto transfer switch) — genset starts when WAPDA fails. Same pattern as the pump but routed differently.
Ammeter Phase Selection
Selector: R / Y / B / OFF. Routes the single panel ammeter through current transformers on each of the three phases in turn. Cheaper than three separate ammeters. Standard on Pakistani 3-phase commercial panels.
Lighting Mode Selection
Selector: NIGHT / DAY / AUTO. NIGHT forces lights on (security mode). DAY forces them off. AUTO lets a photo cell decide. Common on factory outdoor lighting panels.
Common Wiring Mistakes
- Using selector NO contacts in HAND and AUTO positions without verifying they're truly independent. Some cheap selector contact blocks have BOTH terminals closed when the handle is between positions — creating a brief moment where HAND and AUTO are both connected. The motor can briefly start from PLC even when operator thought they were in HAND. Use only quality contact blocks with positive position-only closure.
- Forgetting that 0 (OFF) is truly off. Don't wire anything to the centre position unless you specifically want a third mode. The OFF should be a hard isolation.
- Mounting a selector switch in a panel cutout sized for an indicator lamp. They're 22 mm but the bezel diameter is larger — check the rear clearance behind the panel before drilling.
- Using a maintained selector when a spring-return is needed. For JOG FWD / OFF / JOG REV, the operator wants to hold the handle in JOG direction for as long as they need; releasing returns to centre. A maintained selector leaves the motor jogging if operator walks away.
- Skipping the key-operated version where security is needed. A regular knob can be turned by anyone passing by — disastrous on industrial machinery in unattended areas.
Selector Switch + Contact Block Combinations
| Application | Head | Contact Block |
|---|---|---|
| Simple ON/OFF | 2-position maintained | 1NO |
| HAND/OFF/AUTO motor mode | 3-position maintained | 1NO (pos I) + 1NO (pos II) |
| JOG FWD / OFF / JOG REV | 3-position spring-return | 1NO (pos I) + 1NO (pos II) |
| Security lockout (operator key) | Key-operated 2-position | 1NO (key-removable only in OFF) |
| Source selection (mains/gen/solar) | 4-position maintained | 1NO per position (4×) |
| 3-phase ammeter selection | 4-position maintained | 1NO per phase + 1NC in OFF |
Frequently Asked Questions
What is a selector switch?
A selector switch is a rotary panel-mount device that lets the operator choose between two or more fixed modes (typically HAND / OFF / AUTO). The handle stays in the position you set it to until manually turned. It mounts in the same 22 mm hole as push buttons and indicator lamps, in industrial control panels.
What is the price of a selector switch in Pakistan?
CNC selector switches in Pakistan 2026: 2-position from Rs.380, 3-position maintained from Rs.480, 3-position spring-return from Rs.520, 4-position from Rs.620, key-operated lockable from Rs.650, illuminated with LED indicator from Rs.780.
What is the difference between a selector switch and a push button?
A push button is momentary — its contacts change state only while you press it. A selector switch is maintained — the rotary handle stays in whichever position you left it until manually turned. Push buttons trigger actions (start, stop, reset). Selector switches choose modes (HAND/OFF/AUTO).
What does HAND/OFF/AUTO mean?
It's a standard 3-position selector setting for motor and pump controllers. HAND: operator uses local START/STOP push buttons. OFF: motor cannot run, safe for maintenance. AUTO: external automation (PLC, float switch, thermostat) controls the motor. Standard pattern on every Pakistani factory motor starter.
Do I need a key-operated selector?
Use a key-operated selector when a regular knob would be a safety or security risk — anywhere unattended public access is possible (lift FIREMAN mode, factory machinery in shared spaces, electrical room override switches). The key can be removed in the OFF position to lock the function out.
Can I use a selector switch for motor direction (FWD/REV)?
Yes — but use a spring-return 3-position selector so the handle naturally returns to centre when released. Never use maintained for FWD/REV — operator could walk away leaving the motor running in jog mode. Pair with mechanically and electrically interlocked contactors for safety.
What size hole do I drill for a selector switch?
The IEC standard hole size is 22.5 mm — same as push buttons and indicator lamps. Use a 22.5 mm chassis punch for clean panels. The bezel diameter is larger (~30 mm) so check rear panel clearance.
Pick the right selector switch for your panel
Tell us the application (HAND/OFF/AUTO, FWD/REV, source selection) and we’ll spec the right head + contact block combo.
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