06/05/2025
🚦 Traffic Light Control Circuit with 3-Second Timer ⏱️💡
This diagram represents a sequential traffic light control system using contactors (K1, K2, K3) and timers (T1, T2, T3). It automates the switching between green, yellow, and red lights with a 3-second interval for each light.
🔌 Main Components:
S1 & S2: Start and stop push buttons for the system.
Q1: Circuit breaker for power protection.
K1, K2, K3: Contactors used to control each lamp (green, yellow, red).
KT1, KT2, KT3: Time delay relays set to 3 seconds.
X1, X2, X3: Indicator lamps (green, yellow, red respectively).
⏱️ How the Circuit Works:
Start (S1): Energizes contactor K1 and timer KT1, turning on the green light (X1).
After 3 seconds, KT1 activates, switching to K2, starting timer KT2 and lighting up the yellow light (X2).
Another 3 seconds later, KT2 switches to K3, starting KT3 and turning on the red light (X3).
KT3, after 3 seconds, restarts the cycle by triggering K1 again via KT3’s NO contact.
✅ Why This is Useful:
This type of logic is used in:
Traffic signals 🚦
Industrial visual indicators 🏭
Teaching sequential control circuits 🧑🏫.
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