Eaton NZMN2-A160 Circuit Breaker - 160A 3P 50kA

The breaking capacity (Icu) is 50 kA at 400/415 V 50 Hz, and the rated breaking capacity (Icn) is 85,000 A.

The rated uninterrupted current (In = Iu) is 160A, and the nominal voltage (Ue) is 690V.

The overload protection setting (`Ir`) can be adjusted from 125A to 160A, and the un-delayed short circuit setting (`Im`) ranges from 960A to 1600A. Specific adjustment procedures should be followed from the product manual, typically involving turning adjustment dials.

This circuit breaker features screw connections for fixed installation.

The NZMN2-A160 has an IP20 rating, which means it is protected against solid objects larger than 12.5mm but has no protection against water. It should be installed in a suitable enclosure to protect it from environmental factors.

It means the breaker uses two different mechanisms to detect overcurrents: a thermal element that detects sustained overloads (like a bimetallic strip) and a magnetic element that detects sudden, high-magnitude short circuits.

The dimensions are 105 mm in width and 149 mm in depth.

Check if the overload setting (`Ir`) is too low for the connected load or if there is a direct short circuit. Verify connections are secure and that the load is functioning correctly.

Ensure the overload and short-circuit settings (`Ir` and `Im`) are correctly configured. Verify the fault current is sufficient to trigger the trip mechanism. If the issue persists, the device may be faulty and require replacement.

Slight warmth can be normal due to current flow. However, if the breaker is excessively hot to the touch, check for loose terminal connections or if the continuous current exceeds the rated current (160A). Reduce the load or replace the breaker if necessary.

Ensure the adjustment dials are being turned correctly as per the manufacturer's instructions. Do not force the dials. If they seem stuck, there might be an internal issue.