Star–Delta Start Timers

Star–Delta Start Timers are motor control timers designed to manage the transition delay between the star and delta contactors in three-phase motor starting circuits. They ensure smooth acceleration and reduce mechanical and electrical stress during startup in industrial motor applications.

🔧 Technical Highlights:

• Function: Provides adjustable time delay between star and delta contactor switching for motor soft starting.
• Supply Range: Universal 12–240 V AC/DC versions available for flexible integration.
• Timing Range: Adjustable transition period typically from 0.1 to 30 seconds.
• Outputs: SPCO or DPCO relay contacts rated for motor control duty (AC-15).
• Control Logic: Start input energises the star contactor; after the preset delay, delta output activates automatically.
• Indicators: LED indication for power, timing, and relay status.
• Mounting: DIN rail or panel mount options for compact control panel integration.
• Compliance: CE and RoHS compliant; UL and CSA versions available for export panels.

✅ Benefits:

• Ensures smooth motor start-up with reduced current inrush.
• Minimises mechanical shock and prolongs motor and contactor life.
• Adjustable delay allows fine tuning for different motor sizes.
• Universal voltage input simplifies stock management.
• Compact design optimises space within control panels.

🚀 Applications:

• Three-phase induction motor control panels.
• HVAC and compressor systems requiring reduced start current.
• Pumps, conveyors, and fans with high inertia loads.
• Process machinery using classic star–delta start sequences.
• General automation panels where motor protection is essential.

Star–Delta timers provide precise transition delay control for reliable motor starting, reducing electrical stress and improving operational efficiency in industrial installations.

Related Timing Categories

• On-Delay Timers
• Off-Delay Timers
• Multi-Function Timers
• Run-Back Timers
• Staircase Timers

FAQs

• Q: What is the purpose of a star–delta timer?
  A: It introduces a delay between the star and delta contactor operations, allowing motor current and torque to stabilise before switching to full load.
• Q: How do I select the correct delay time?
  A: Typically set between 3 and 12 seconds, depending on motor size and application. Too short a delay may cause overlap; too long can interrupt motor acceleration.