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.
Source DocumentedChannel stated on listing & quote
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Independent China distributor & sourcing agent· Listing updated Sep 2026
Specifications
| Parameter | Value |
|---|---|
| Overvoltage category | III |
| Parameter | Value |
|---|---|
| Width | 72 mm |
| Height | 90 mm |
| Depth | 76 mm |
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