250 A MCCB with TM240 release — selectivity and SCCR planning
Breaking capacity runs 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, 17 kA at 500 V, and 11.9 kA at 690 V — enough headroom for most industrial service-entrance and sub-distribution applications where fault current is high. No field-adjustable electronic trip unit here — it's a straightforward overcurrent protector for fixed-load feeders or main breakers where you don't need LSIG or ground-fault options.
Thermal derating and power dissipation
Rated 250 A continuous up to 50 °C ambient. Above that, derate linearly: 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. Maximum power loss is 57 W at rated current.
Dimensions: 70 mm deep, 140 mm wide, 158 mm tall. The 70 mm depth is relatively shallow for a 250 A frame — useful when gland-plate clearance or enclosure depth is tight. Insulation voltage rated 800 V.