The C164TM160D is a thermal-magnetic trip unit for the ComPacT NSX100...250 DC range, rated 160 A at 40 °C with 4 protected poles (4D) on a 4-pole frame. It protects DC distribution circuits per EN/IEC 60947-2, with a fixed instantaneous pickup at 1250 A and an adjustable long-time pickup from 0.7 to 1.0 x In. The 750 V DC rated operational voltage means it handles the full DC bus voltage in common industrial battery banks, UPS outputs, or DC distribution panels — not just the lower 125 V or 250 V tiers. The LI protection profile — thermal overload (L) and magnetic short-circuit (I) — is the standard for DC branch circuits where earth-leakage detection is handled separately or not required. The fixed instantaneous trip at 1250 A (7.8 x In) provides a defined short-circuit threshold; no field adjustment means fewer commissioning variables but also no tuning around nuisance trips on capacitor inrush or motor starting in DC drives.
The trip unit mounts into a fixed ComPacT NSX DC circuit breaker frame. IP40 enclosure protection suits general-purpose indoor panels; no additional sealing is needed for standard control rooms or electrical rooms. Class II double-insulation construction simplifies grounding — no separate protective earth conductor required on the trip unit itself.