The Siemens 5SU1674-7CK81 is a 4-pole RCBO (residual current operated circuit breaker with integral overcurrent protection) from the SENTRON 5SU1 series, Super Resistant K design. It combines overcurrent protection (C characteristic) with Type B residual current detection in a single 11-module-wide unit for 277/480 V AC networks at 50/60 Hz.
The headline 100 A rating holds only at 30 °C ambient. At 40 °C it derates to 92.5 A, at 45 °C to 89 A, at 50 °C to 85 A, at 55 °C to 81 A, and at 60 °C to 77 A.
Breaking capacity and standards
Physical fit and mounting
Width is 198 mm (11 width units at 18 mm per unit), depth 77 mm, installation depth 70 mm, height 90 mm. Supply can enter from top or bottom.