Description

Robust Three-Phase Direct On-Line (DOL) Motor Starters

Experience unparalleled reliability and straightforward control with our range of Three-Phase Direct On-Line (DOL) Motor Starters. Designed for the efficient and safe operation of three-phase AC induction motors, our DOL starters provide a complete, pre-assembled solution for applications where full voltage starting is permissible and desirable. Ideal for industrial and commercial environments, these starters ensure your motors operate smoothly while being protected from damaging electrical conditions.

What is a DOL Motor Starter?

A Direct On-Line (DOL) motor starter is the simplest form of motor starter. It connects the motor directly to the full line voltage when started. This provides maximum starting torque but also results in high inrush current. Our DOL starters typically consist of a heavy-duty contactor for switching, a thermal overload relay for protection, and control circuitry, all housed within a protective enclosure.

Key Features

• Integrated Design: Combines a high-performance magnetic contactor, a precision-adjustable thermal overload relay, and robust control circuitry in a single, compact, and ready-to-install unit.
• Superior Motor Protection: The advanced thermal overload relay provides crucial, adjustable protection against overcurrents, phase loss, phase unbalance, and prolonged starting, safeguarding your valuable motors from costly damage.
• Intuitive Manual Control: Equipped with clearly marked Start and Stop pushbuttons for immediate, local operation.
• Visual Status Indicators: Features bright LED indicator lamps (e.g., Run, Stop, Trip) for quick and unambiguous operational status assessment.
• Durable Enclosure: Housed in a high-grade, IP-rated enclosure (e.g., IP55 or IP65) offering excellent protection against dust, dirt, moisture, and light jets of water, ensuring reliable performance in demanding industrial environments.
• High Switching Capacity: Built with robust contactors engineered for frequent switching operations and high current handling, ensuring a long operational life.
• Easy Installation & Wiring: Pre-wired internal components and clearly marked, generous terminals simplify installation, reducing setup time and labor costs.
• Thermal Trip Test Function: Allows for easy periodic testing of the overload relay's tripping mechanism to ensure continued protective functionality.
• Auxiliary Contacts: Often includes integrated auxiliary contacts for feedback to PLC systems or interlocking with other control circuits.

Benefits

• Enhanced Motor Lifespan: Proactive and precise protection against overload and phase imbalances significantly extends the operational life of your valuable motors, reducing replacement frequency.
• Reduced Downtime & Maintenance: Reliable operation and robust protection minimize unexpected breakdowns and costly emergency repairs, ensuring continuous production.
• Simplified Operation: User-friendly pushbuttons and clear indicators allow for effortless control and monitoring by operators, regardless of technical expertise.
• Cost-Effective Solution: DOL starting is the most economical method for applications where reduced starting current is not a primary concern, offering excellent value without compromising protection.
• Safety & Compliance: Adherence to international safety standards (e.g., IEC 60947-4-1) ensures a secure operating environment and regulatory compliance.
• Robust & Reliable: Engineered for longevity, these starters provide consistent performance even under harsh industrial conditions.

Ideal Applications

Our Three-Phase DOL Motor Starters are perfectly suited for a wide array of applications where full voltage starting is acceptable:

• Water and Wastewater Management: Pumps (centrifugal, submersible, booster)
• HVAC Systems: Fans, blowers, air handling units
• Material Handling: Conveyor systems, hoists, small cranes
• General Industrial Machinery: Grinding machines, saws, drilling machines, mixers, agitators
• Compressors: Smaller, non-critical air compressors
• Agricultural Equipment: Farm pumps, feed systems

Technical Specifications (Vary by Model)

• Motor Rating: Available for motors ranging from 0.37 kW (0.5 HP) up to 30 kW (40 HP) (please specify desired motor power for selection).
• Rated Operational Current (Ie): Configurable options typically from 0.6 A up to 63 A (ensure to specify the required FLA range for your motor).
• Rated Operational Voltage (Ue): 3-Phase, 200V / 230V / 400V / 415V / 440V / 480V / 525V / 690V AC (selectable).
• Control Circuit Voltage: 24V AC/DC, 110V AC, 230V AC, 400V AC (selectable for local control).
• Overload Setting Range: Adjustable within a specific range (e.g., 0.63-1A, 1-1.6A, 10-14A, etc.) to match precise motor full load amperage.
• Enclosure Protection: IP55 (Standard) or IP65 (Upon request) – suitable for various indoor and outdoor industrial uses.
• Operating Temperature: Typically -25°C to +55°C.
• Standards & Compliance: Fully compliant with IEC 60947-4-1, CE.
• Mounting: Designed for secure wall-mounting.
• Terminals: Screw-type terminals for main power and control wiring.

Why Choose Our DOL Starters?

When you choose our Three-Phase DOL Motor Starters, you're investing in proven technology, uncompromising quality, and the peace of mind that comes with superior motor protection and control. Our commitment to robust design, adherence to international standards, and rigorous testing ensures a product that performs reliably, efficiently, and safely, even in the most demanding industrial settings.

Ready to safeguard your motors and streamline your operations? Contact us today for a quote or to discuss your specific application requirements. Our experts are here to help you select the perfect DOL starter solution.