The D characteristic means it's built for loads with a high starting surge: motors, transformers, welding sets. Out here in the grease, that's the difference between nuisance tripping on a compressor start and actually clearing a dead short.
Siemens 5SY4425-8FA SENTRON MCB, 4P D-curve 25A 10kA
MPN5SY4425-8FA
Siemens SENTRON 5SY4425-8FA, 4-pole miniature circuit breaker, D tripping characteristic, 25 A rated current, 10 kA breaking capacity at 400 V AC per EN 60898.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Brand name | SENTRON |
| Application suitability | Mechanical engineering / industry |
| Parameter | Value |
|---|---|
| Number of poles | 4 |
| Pole configuration | 4P |
| Rated current (In), AC | 400 V |
| Rated current (In), AC | 25 A |
| Rated voltage, AC (multi-phase) | 440 V |
| Rated voltage, AC (single-phase) | 440 V |
| Rated voltage, DC (max.) | 72 V |
| Voltage type | AC |
| Rated frequency | 50/60 Hz |
| Parameter | Value |
|---|---|
| Tripping characteristic (trip curve) | D |
| Rated breaking capacity (Icn), per EN 60898 | 10 kA |
| Overvoltage category | III |
| Degree of protection (IP) | IP20, with connected conductors |
| Neutral conductor switching | No |
| Touch protection | Yes |
| Parameter | Value |
|---|---|
| Width in modular units | 4 |
| Width | 72 mm |
| Height | 90 mm |
| Depth | 76 mm |
| Installation depth | 70 mm |
| Mounting position | any |
| Combined terminal, top | Yes |
| Combined terminal, bottom | Yes |
| Sealable | Yes |
| Parameter | Value |
|---|---|
| Halogen-free | Yes |
| Silicone-free | Yes |
| Influence of ambient temperature (derating) | max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C |
| Parameter | Value |
|---|---|
| Mechanical service life (switching cycles, typ.) | 10 000 |
Product details
Frequently asked questions
Will the 5SY4425-8FA drop into a panel wired for 5SY6613-8 without rewiring?
Not directly — the 5SY4425-8FA is a 4-pole D-curve 25 A breaker; the 5SY6613-8 is a different pole count and rating. Terminal wire range (0.75–35 mm²) and DIN-rail footprint are similar, but the tripping characteristic and current rating differ, so verify the circuit's coordination before swapping.
What is the 5SY4425-8FA's depth?
76 mm overall depth, with a 70 mm installation depth behind the panel face.
What wire sizes does the 5SY4425-8FA accept?
Solid and stranded copper from 0.75 mm² up to 35 mm².
MPN
5SY4425-8FA