The DOT/M Single-Relay Star-Delta Timer, developed by Borna Electronics, is an effective solution for starting three-phase induction motors using the star-delta starting method. The relay controls the transition from star connection to delta connection, reducing starting current and minimizing mechanical and electrical stress on the motor.
Its compact design allows easy installation inside oil-immersed motor starters and control switches. The adjustable star timing function enables users to optimize motor starting performance for different applications.
Features
- Adjustable star connection time from 1.5 to 30 seconds
- Suitable for installation inside oil-immersed motor starters
- Timing range: 1.5 to 30 seconds
- Available for 380 VAC applications
- One C/O (SPDT) output relay
- Compact miniature design
- Two LED indicators: PWR (Power Supply Status) and OUT (Output Relay Status)
Technical Specifications
| Parameter | Specification |
| Supply Voltage | 220 VAC ±15% |
| Network Frequency | 50 Hz ±5% |
| Internal Power Consumption | Approx. 2 W |
| Timing Range | 1.5 to 30 seconds |
| Protection Degree | IP20 according to IEC 60529 |
| Operating Temperature | -20°C to +60°C |
| Relative Humidity | 15% to 85% |
| Mounting Method | DIN Rail according to IEC 60715 |
| Output Relay | One C/O (SPDT) contact, 6 A |
Applications
- Three-phase induction motor starting
- Star-delta motor starters
- Industrial motor control panels
- Pump and compressor systems
- Fans and blower applications
- Motor starting current reduction systems
The DOT/M Single-Relay Star-Delta Timer provides a simple and reliable method for controlling star-delta motor starting sequences, helping reduce inrush current and improve motor startup performance.