Breaking capacity and dual-standard compliance
The A9N19852: This miniature circuit breaker carries a 15 kA breaking capacity at 230 V AC, certified under both EN/IEC 60898-1 (Icn) and GB/T 10963.1, and also under the higher-duty EN/IEC 60947-2 (Icu) and GB/T 14048.2. That dual-standard rating means it qualifies for both residential-distribution board applications (60898-1) and industrial panel use (60947-2), where the fault-current duty is higher and the breaker must interrupt without upstream coordination failure. The 100 A rated current at 30 °C is the continuous thermal-magnetic trip point — sized for a main feeder or a heavy subfeed in a 230 V single-phase AC network.
D curve — magnetic trip characteristic
The D curve defines a magnetic tripping threshold of 10 to 14 times the rated current (In), with a tighter 12 x In ±20 % under the 60947-2 standard. For a 100 A D-curve MCB, the instantaneous magnetic trip activates between roughly 1000 A and 1400 A, letting through the inrush without opening while still protecting against hard short circuits.
Depth of 73 mm, height 81 mm. Tunnel-type terminals accept 1 to 50 mm² rigid cable or 1.5 to 35 mm² flexible, with a tightening torque of 3.5 N·m on the power circuit. The toggle handle provides local ON/OFF indication and a contact-position indicator confirms the state for isolation purposes — the breaker is marked suitable for isolation, meaning it can be used as a disconnection point under lockout/tagout procedure.