The TM-D trip provides L (thermal) overload protection and I (magnetic) short-circuit protection. The 125 A rating at 50 °C means the breaker carries full load current at typical panel ambient; no derating needed unless the enclosure runs hotter. The 3-pole 3D protected poles configuration covers three-phase loads — motors, HVAC, lighting distribution — in a 105 mm wide footprint. The IP40 front face and IK07 impact resistance suit indoor panel installation where occasional tool contact is expected.
The H rating gives 100 kA Icu at 240 V, 70 kA at 415 V, 65 kA at 440 V, 50 kA at 500 V, 35 kA at 525 V, and 10 kA at 690 V AC. At 415 V — the most common three-phase distribution voltage — 70 kA covers high-fault panels fed by large transformers. At 690 V the 10 kA limit means this breaker is not the right choice for 690 V high-fault industrial circuits; a higher-rated frame would be needed.
The toggle control provides visual on/off indication. Five accessory slots allow add-on modules (shunt trip, auxiliary contacts, alarm switch) without removing the breaker.