The C16BS4FM is a ComPacT NS1600b type NA basic frame — a 4-pole manually operated switch disconnector rated 1600 A in AC-23A duty, which covers motor loads with occasional overloads (switching of motors, transformers, and resistive loads). The 1600 A figure holds across the full voltage range from 220 V to 690 V AC, so derating is not required for higher line voltages. Short-time withstand current is 32 kA for 3 seconds, and short-circuit making capacity hits 135 kA at 690 V AC — meaning this frame can close onto a fault and ride through a bolted short without welding contacts or bursting the enclosure. Pollution degree 3 (industrial environment, conductive pollution) is designed in, so it lives reliably in panel environments without conformal coating.
Deployment context
Fixed-mounted, front-front connection, 70 mm pole pitch. The 350 mm width × 535 mm height × 160 mm depth frame fits into a standard distribution cubicle or MCC bucket. IK07 impact resistance handles accidental tool strikes during panel work.