What the 630 A rating means for your panel
The EZC630N3400N is a 3-pole molded case circuit breaker from the Schneider Electric EasyPact EZC630N series, rated 630 A at 40 °C. The thermal-magnetic TM-D trip unit handles two protection curves: overload (thermal, slow response) and short-circuit (magnetic, instantaneous). Magnetic tripping is fixed at 4000 A, so any fault current above that level triggers an immediate open. This is a Category A breaker (no intentional short-time delay), meaning it's designed for distribution duty where you don't need selective coordination with downstream breakers on a short-circuit — it opens fast, every time. At 220/230 V AC that figure rises to 40 kA Icu.
It carries multiple international standards: IEC 60947-2, EN/IEC 60947-1, GB/T 14048.2, and JIS C8201-2-2. That gives you compliance across European, Chinese, and Japanese regulatory frameworks — useful for OEMs shipping panels into multiple regions. The IP20 finger-safe enclosure and IK07 impact rating mean it's protected against accidental contact and light mechanical shock inside the panel.
Fixed-mount design for backplate installation. Toggle-style handle with positive contact indication, so you get a visual confirmation of contact position independent of the handle feel.
What the TM-D trip unit does and doesn't do
The TM-D is a thermal-magnetic trip — no electronic adjustment, no interchangeable rating plugs. There is no earth-leakage protection built in; if you need ground-fault detection, you add an external module or specify the EZC with a Vigi add-on. Electrical endurance is rated at 3000 cycles under load at 415 V AC (Category A). Mechanical endurance is 10,000 cycles. For a distribution breaker that sees infrequent switching (maybe a few operations per month), that's ample. For a breaker used as a daily disconnect under load, you'd want to check the duty cycle against your operations count.