Home > NHP and Sprecher + Schuh introduce CT7N – the next generation of thermal overloads

NHP and Sprecher + Schuh introduce CT7N – the next generation of thermal overloads

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article image CT7N bi-metal thermal overload

NHP  and Sprecher + Schuh are soon to release the new CT7N bi-metal thermal overload, which provides advanced protection features and a new look that fits the Sprecher + Schuh family of contactors and motor protection devices.                                    

Sprecher + Schuh have always paid particular attention to the subject of motor protection and this is reflected in their new CT7N line of  bi-metal thermal overload relays which include many features not available in most competitor products.  

Consistent and reliable protection is ensured through a complex factory calibration procedure performed on each unit at full operating temperature.  

Superior Class 10 characteristics – with today’s T-frame (MEPS) motors having less iron and copper than the older motors, a faster class 10 was needed to be developed to assure optimum protection, with the CT7N bi-metal thermal overload providing this necessary feature.

Protection from single phasing is a feature not always found in traditional relays, with the CT7N bi-metal thermal overload providing accelerated tripping under this condition through a special ‘differential tripping’ mechanism built into the CT7N bi-metal thermal overload.  

Other features include: 

  • Selectable manual/automatic reset 
  • Separate normal open signal contact isolated from the trip contact (can be used on different voltage rails) 
  • Increased thermal capabilities for butting devices closer 
  • Can be used on single phase applications with all protection functions available – single phasing and class 10 protection 
  • A new adaptor external rest CT7N-RA3 provides a larger target surface for actuation.

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