Overview
The C104MG025 is a Schneider ComPacT NSX TM25G trip unit rated 25 A at 40 °C with 4 poles and a 4D neutral configuration (fully protected). It provides thermal-magnetic LI protection — L for overload, I for short-circuit — and is designed for generator applications. The unit is fixed-mount, Class II insulated, and conforms to EN/IEC 60947-2. Schneider discontinued this part as of December 2024.
Alternatives & selection
Compared to the C10F3TM025, the C104MG025 carries 4 poles versus 3, making it the correct choice when the BOM specifies a fully protected neutral (4D). The C10F3TM025 is rated 85 kA ICu and 800 V AC insulation, while the C104MG025 does not list those ratings — it is a generator-application trip unit, not a distribution breaker. Pick the C104MG025 when the design requires 4-pole neutral protection and generator-specific thermal-magnetic curves; pick the C10F3TM025 for a 3-pole distribution circuit with higher interrupting capacity.