ABB Main circuit breaker

ABB Stotz S&J Main Circuit Breaker S751/3-E25

Manufacturer: ABB Stotz S&J
Designation: Main circuit breaker with rail adapter
Type: S751/3-E25
Tripping characteristic: E
Number of poles: 3
Rated current: 25 A
Rated voltage: 400 V
Rated insulation voltage Ui: 690 V
Rated short-circuit breaking capacity: 25 kA
Switched neutral conductor: no
Frequency: 50 Hz
Overvoltage category: 4
Degree of pollution: 3
Rated impulse voltage withstand: 6 kV
Mounting type: DIN rail
Protection class (IP): IP40
Size (according to DIN 43880): 6

The selective main circuit breakers of the S750 series are certified as voltage-independent selective main circuit protection switches (SHU) according to DIN VDE 0641-21, user-friendly, and designed for the highest overvoltage category. Their application area is diverse: as a disconnecting device at the meter location according to the TAB of the network operators, as well as in all low-voltage main distributions for the protection of distribution circuits and as a disconnection device with isolation function.

Notable are the special selectivity features that ensure high system availability. The S750 series is designed for direct mounting on a 4- or 5-pole busbar system of 40 mm (12 mm x 5/10 mm). Regardless of the rated current of the S750, it can be directly connected to the busbar system via the lower terminal with up to 50 mm² and a maximum of 100 A. Devices of the S750 family include an integrated locking option that allows simultaneous blocking of the 3 poles of a three-phase supply. The integrated locking slider locks in the ON or OFF position and can additionally be secured with a padlock, wire seal, or cable tie.