The DOL (Direct On-line) and the SD (Star-Delta) panels are included in motor control panels that are used to switch on and run electric motors. The DOL starter connects the motor straight away to the full supply voltage making it suitable for small motors. The Star-Delta Starter first starts the motor in a star connection to reduce the starting current, then switches to a delta connection for normal running, making it ideal for larger motors.

Key Features

• DOL Starters utilize contactors and overload relays for simple, direct full-voltage motor starting

• Star-Delta Starters use timer relays and multiple contactors to switch between star and delta connections

• Protection devices including overload relays, fuses, and short circuit protection

• Control wiring for start, stop, and transition sequences

• Suitable for motors typically under 5 HP (DOL) and 5-20 HP (Star-Delta)

• Compact panel design suitable for industrial and commercial applications

• Easy integration with automation systems and PLC controls

Key Advantages

• DOL Starter provides simple, inexpensive, and reliable starting for small motors

• Star-Delta Starter significantly reduces inrush current and voltage drops during motor start

• Minimizes mechanical stress on motors by smooth voltage transition

• Enhances motor lifespan and reduces maintenance costs

• Provides essential motor protection with built-in overload and fault detection

• Adaptable for a variety of industrial motor control applications