This is the breaker you spec when the branch needs a dedicated 4-pole disconnect with adjustable instantaneous trip — typical for feeder circuits in distribution panels where you need to coordinate downstream with upstream devices.
Interrupting Capacity by Voltage Level
Interrupting capacity varies significantly with system voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. At 240 V the 75.6 kA figure gives substantial headroom for high-fault industrial services; at 690 V the 11.9 kA still covers most standard distribution transformer secondary faults.
The breaker holds its full 20 A rating from 45 °C through 55 °C ambient; at 60 °C it derates to 19 A, and holds there through 70 °C. That means in a warm panel — say 55 °C internal ambient — you still get the full 20 A without derating. Dimensions are 130 mm height, 101.6 mm width, 70 mm depth — fits standard 4-pole MCCB mounting footprints in SENTRON panelboards. Maximum power loss is 12 W, which matters for thermal budgeting in sealed enclosures.