The TM-D provides fixed thermal (L) overload protection and fixed magnetic (I) short-circuit protection — no adjustment dials, which simplifies specification when the load current is known and stable. At 240 V the same breaker handles 90 kA, so it also works on 208/240 V step-down transformers or subpanels.
Mounts flat on a backplate — the standard for panel-mounted MCCBs in distribution boards or motor control centers. IP40 front face keeps dust out; the IK07 impact rating handles accidental tool drops during commissioning.
Thermal management and derating
Rated 100 A at 50 °C ambient — no derating needed at typical 40 °C panel ambient. Power dissipation is 7.7 W per pole (23.1 W total at full load), which is moderate for a 100 A MCCB; adjacent breakers in a multi-pole lineup should have at least 10 mm air gap per standard practice. For installations above 2000 m altitude, derating applies — the breaker is certified for use up to 5000 m with reduced ratings.