What the 160 A rating means for your panel
For distribution panels feeding mixed loads (lighting, small motors, control transformers), this is the main feeder or heavy branch breaker. The 4-pole (4P) configuration with left-side neutral and 4D protected poles means all four poles are monitored for overcurrent; the neutral is not just switched but protected. Fixed-mount, backplate style — this bolts into a switchboard or enclosure, not a DIN rail. Screw terminals accept up to 300 mm² aluminium or copper, so the lugs match large feeder cable.
Breaking capacity and voltage — selectivity headroom
The breaking capacity code 'S' on the NSX platform typically indicates a standard interrupting rating (around 25 kA at 480 V, but confirm the exact kA from the breaker label for your fault current study). The 50/60 Hz rating matches standard mains frequencies. Electrical durability runs 20,000 cycles at 440 V at rated current, halving to 10,000 cycles at full 690 V — fine for infrequent switching in a distribution role, not for daily load-break duty.
Mounting and integration — fixed, backplate, front connections
Fixed mount on a backplate — no DIN-rail adapter. Both line and load connections are front-facing, so busbar or cable routing stays in one plane. The toggle rotary handle or extended rotary handle options (control type) mean the breaker can be operated from the enclosure door via a rotary mechanism. IK07 impact resistance handles incidental tool contact.