What it is and what the ratings mean for fit
The Siemens SENTRON 5SV4646-0KL is a 4-pole residual-current circuit breaker (RCCB) rated 63 A at 40 °C, 45 °C, 50 °C, 55 °C, and 60 °C — no derating needed across that band. At 65 °C it still holds 57.35 A, and at 70 °C it holds 48.8 A. The 300 mA trip threshold (type AC, instantaneous) is sized for general-purpose protection of circuits feeding socket outlets or fixed equipment where sinusoidal AC fault currents are the expected waveform. The 10 kA short-circuit current rating (SCCR) means the device safely interrupts faults up to that level without upstream fusing — a key figure for panel coordination studies. The 4-pole design switches and monitors the neutral conductor for residual current in three-phase TN or TT systems.
Lifecycle and sourcing reality
The part carries the SENTRON brand and is designed to EN 60898 (rated conditional short-circuit current 0.8 kA) and IEC 61008-1 (same 0.8 kA rating). The silicon-free construction is relevant for applications where outgassing must be minimised — e.g., sealed enclosures or sensitive electronic environments.
Integration notes
Depth is 70 mm, width 72 mm, height 90 mm. The 4 MW units occupy four standard DIN-rail positions. Installation depth matches the 70 mm dimension. Ambient operating range is -25 °C to +45 °C; storage range is -40 °C to +75 °C. The 50 Hz operating frequency is fixed.