The C104TM080D is a TM-D thermal-magnetic trip unit for the ComPacT NSX100...250 DC range, rated 80 A at 40 °C. It protects a 4-pole DC distribution circuit with LI protection — thermal overload (L) and fixed magnetic short-circuit (I) set at 800 A. The 750 V DC rated operational voltage means it handles the bus voltage in industrial DC distribution, UPS outputs, or battery-string feeders where 750 V DC is the rail. IP40 front face keeps tools and fingers out but expects a clean enclosure behind.
Long-time pickup adjusts 0.7–1 x In. Instantaneous trip is fixed at 800 A. Four protected poles, all DC-rated (: 4D). That means the trip unit opens both the positive and negative legs in a 2-wire DC system, or all four poles in a 4-wire DC distribution. No earth-leakage module — this is bare overcurrent and short-circuit only; add a Vigi block externally if ground-fault detection is required.
Lifecycle status is active — Schneider continues manufacturing the C104TM080D as a current catalog item. No last-time-buy or end-of-life notice exists.
EN/IEC 60947-2 governs the breaking performance, coordination, and test sequences. Pollution degree 3 and IP40 are the environmental ratings. The unit is Class II for electrical shock protection — double-insulated, no earth connection required. Storage range -50 to 85 °C and operating range -25 to 70 °C cover most indoor panel environments.