Hey electrical champs! ๐ท♂️
In today’s post, I’m sharing a complete step-by-step guide to designing a DOL (Direct On Line) Starter for a 1 HP Motor using AutoCAD Electrical.
Whether you're a student, working professional, or just someone exploring panel wiring, this is a must-know project that combines theory with practical design.
๐ง What is a DOL Starter?
A DOL Starter is the simplest way to start a 3-phase induction motor. It directly connects the motor to the full line voltage using a contactor, MCB, overload relay, and push buttons.
⚙️ Components Used:
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MCB – 6A, 3-Pole
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Contactor – 9A, 3-Pole with 230V coil
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Overload Relay (OLR) – 1.5–2.5A adjustable range
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Push Buttons – Green (Start, NO), Red (Stop, NC)
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Cable – 2.5 sq.mm for all phases
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Control Supply – 1 Phase + Neutral for the contactor coil
๐ฅ️ What I Did in AutoCAD Electrical:
✅ Created the power diagram using standard IEC symbols
✅ Added terminal numbers and pin data using the Edit Component tool
✅ Properly routed L1, L2, L3, and Neutral (not L4 ๐)
✅ Labeled wire connections and added cable size info
✅ Assigned correct ratings to every component for a 1 HP motor
๐ก Pro Tips:
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Always use 2.5 sq.mm cable for safety and durability.
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Use A1 and A2 for coil terminals (A1 to phase, A2 to neutral).
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Never label neutral as L4 — keep it as N for clarity and standards!
๐ฝ️ Watch the Full Tutorial
๐ EASY ELECTRA
Go watch the video and follow along with the AutoCAD drawing step by step.
๐ Learn More with Easy Electra
If you enjoy practical electrical projects like this, don’t forget to subscribe to my YouTube channel — Easy Electra! I regularly post tutorials on PLC, SCADA, AutoCAD, Factory IO, and industrial automation.
Let me know in the comments if you want the control circuit next! ๐
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