Siemens SENTRON 5SY6 series miniature circuit breaker, 5SY6663-8, 63 A, D tripping characteristic, 4-pole (3P+N), 400 V AC, 10 kA IEC 60947-2, 6 kA EN 60898, 72 mm wide, IP20.
| Parameter | Value |
|---|---|
| Overvoltage category | III |
| Parameter | Value |
|---|---|
| Width | 72 mm |
| Height | 90 mm |
| Depth | 76 mm |
The Siemens SENTRON 5SY6663-8 is a 4-pole (3P+N) miniature circuit breaker rated 63 A with a D tripping characteristic, designed for 400 V AC industrial and mechanical engineering panels.
Snaps onto DIN rail via the quick assembly system — 4 width units (72 mm wide, 90 mm tall, 76 mm deep) with 70 mm installation depth. IP20 with conductors connected; any mounting position works, and the -25 to +55 °C ambient range covers most unventilated enclosures.
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76 mm, with an installation depth of 70 mm. The overall dimensions are 72 mm wide by 90 mm tall.
Solid and stranded conductors from 0.75 to 35 mm² at both top and bottom combined terminals.
The MCB carries IEC 60947-2 (10 kA), EN 60898 (6 kA), and UL 1077 / CSA C22.2 No.235 (5 kA) ratings. It is halogen-free and silicon-free. Standard Siemens declarations (CE, UKCA) apply; specific RoHS/REACH declarations available on request.
The 5SY4140-7 is a 4-pole SENTRON MCB but rated 40 A with a B curve — lower current and different trip characteristic. It will not drop into the same slot without recalculating the branch protection and coordination study. For a 63 A D-curve replacement, the 5SY6663-8 is the correct order code.
Alternative models and sibling configurations in the same Siemens series. For obsolete or discontinued parts, these models can serve as compatible replacements or functional alternatives for plant maintenance.
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