Automatic Air Brake Star Delta Starters

Construction Air Brake Star Delta Starters

• Totally enclosed, in a deep-drawn sheet metal casing, wall mounting type, suitably gasketted to make it dust proof
  
• The entire starter assembly (which is mounted on a steel plate) can be taken out of the casing by removing four screws only.
  
• Maintenance is facilitated by taking the interior out for repair while a spare interior can be inserted.
  

• The automatic star delta starters are ideal for controlling motors upto 40 HP at 400/440 volts or 500/550 volts
  
• Adjustable Timer is incorporated for automatic changeover from Star to Delta.
  

• Are provided with magnetic type overload releases with an adjustable oil dashpot time lag device on all the three phases
  
• The magnetic overload device, which works on the magnetic principle of current, is totally independent of the ambient temperature, provides a positive and direct protection to the motor
  
• Non-aging properties inherent to the magnetic overload device ensures the same protection to the motor even after years of service
  
• Can also be fitted with thermal type bi-metallic overload releases with temperature compensation devices
  
• The overload device is of the Hand-Resetting type which is an essential feature where remote control is required.
  
• The under voltage protection is inherent
  

• Start and Stop/Reset Push Buttons are provided on the front cover
  
• Remote control terminals are also provided for remote operation by means of limit switch, float switch, pressure switch or a separate push button unit.
  

• A rotary type triple pole air break isolating switch can be provided on starters, the operation of which is interlocked with the lid of the starter
  
• Ensures that the starter lid cannot be opened till the isolator is in the OFF position.
  

• Units are provided with entries for conduit connections
  
• Sealing boxes can be provided for underground paper-insulated cables.
  

• Double earthing terminals are provided.
  

• Special current activated change-over Timer ensures transition from Star to Delta at approximately the rated current of the motor only, irrespective of the transition time which depends on the drive
  
• This leads to no wear on the contacts due to transition kicks.