Chint NQ3 DOL Starter

Where to Use NQ3 DOL Motor Starter?

The Chint NQ3 DOL Starter is a DOL (Direct On-Line) Motor Starter providing complete motor starting and protection in one integrated unit. Designed for three-phase squirrel cage motors up to 0.37kW - 15kW, this starter combines contactor, overload relay, and enclosure for quick installation in pump controls, compressor stations, fan systems, and small machinery.

What is DOL Starting?

DOL (Direct On-Line) is the simplest motor starting method where the motor receives full line voltage immediately upon start. This provides maximum starting torque but draws 6-8 times rated current for a brief period. DOL is suitable for:

• Small to medium motors (up to 10-15kW typically)
• Applications where high starting torque is needed
• Systems that can handle the brief current surge
• Machinery that doesn't require speed control

Integrated Protection Features

• Contactor - Heavy-duty switching for motor control
• Thermal Overload Relay - Built-in overload and phase-failure protection
• Enclosure - IP55 protection for indoor/outdoor installation
• Start/Stop Buttons - Local control with emergency stop option
• Indicator Lamps - Power/Run status indication

FAQs

Q: What's the difference between NQ2 and NQ3 starters?

A: NQ2 is the standard series for general applications. NQ3 offers enhanced features and higher power ratings, suitable for more demanding industrial environments.

Q: Can I use DOL starter for a 15kW motor?

A: DOL is generally suitable up to 10-15kW depending on your power supply capacity. Above this, consider Star-Delta or Soft Starter to reduce starting current. Check with your electrical engineer if unsure.