ABB Main load switch

ABB Stotz S&J Main Switch S754DR-K80

Manufacturer: ABB Stotz S&J
Designation: Main switch 25kA, 80A, 4P
Type: S754DR-K80
Tripping characteristic: Other
Number of poles: 4
Rated current: 80 A
Rated insulation voltage Ui: 690 V
Rated short-circuit breaking capacity: 25 kA
Overvoltage category: 4
Degree of pollution: 3
Mounting type: DIN rail
Protection class (IP): IP20
Size (according to DIN 43880): 3

The S750DR in 80 and 100A are selective main circuit breakers (SH switches), VDE certified according to IEC / EN 60947-2, and are used as group or backup circuit breakers instead of NH fuses or other overcurrent protection devices in main distributions or switchgear. They provide complete selectivity for upstream and downstream protective devices due to the unique energy limitation in case of a fault. The S750DR does not require a neutral conductor connection and is voltage-independent. No auxiliary power is needed for switching on or off or for the protection function. The design ensures reliable fulfillment of the protection function, regardless of network disturbances or network form. The S750DR is designed for mounting on DIN rails. The 3-pole devices can be connected to a 40mm busbar system using the busbar adapter S750DR-QA.

Application: Purpose-built structures, industry, safety-critical areas, and to ensure high system availability. For example, in buildings for large gatherings of people and in medically used areas.