The 4-pole construction (switching all three phases plus neutral) makes it suitable for three-phase circuits where neutral continuity must be maintained through the device.
Temperature derating — real-world capacity
The 100 A rating holds at 40 °C and 45 °C (93 A), then steps down: 90 A at 50 °C, 87 A at 55 °C, 85 A at 60 °C, 83 A at 65 °C, and 80 A at 70 °C.
Occupies 5 modular width units on a DIN rail (REG fastening method), with a 124 mm width and 70 mm depth.
This is a standard-catalog SENTRON RCD, widely specified across European and export panels. For a BOM freeze or last-time-buy, the 50 Hz operating frequency and AC-type residual current are the binding constraints — verify the installation's frequency and fault-current type before committing.