Siemens SENTRON 5SL4450-8, 4-pole miniature circuit breaker, D tripping characteristic, 50 A rated at 400 V AC, 10 kA breaking capacity, 4 MW units.
| Parameter | Value |
|---|---|
| Brand name | SENTRON |
| Application suitability | Residential buildings/infrastructure |
| Parameter | Value |
|---|---|
| Number of poles | 4 |
| Pole configuration | 4P |
| Rated voltage, AC (multi-phase) | 440 V |
| Parameter | Value |
|---|---|
| Tripping characteristic (trip curve) | D |
| Energy limitation class | 3 |
| Overvoltage category | III |
| Pollution degree | 2 |
| Degree of protection (IP) | IP20, with connected conductors |
| Parameter | Value |
|---|---|
| Width in modular units | 4 |
| Width | 72 mm |
| Height | 90 mm |
| Depth | 76 mm |
| Installation depth | 70 mm |
| Mounting position | any |
| Tightening torque, max. | 75 °C |
| Tightening torque, min. | -40 °C |
| Sealable | Yes |
| Parameter | Value |
|---|---|
| Halogen-free | Yes |
| Silicone-free | Yes |
| Parameter | Value |
|---|---|
| Power loss per pole, AC (hot state, at In) | 3.6 W |
The D curve suits loads with high inrush — motor starters, transformers, or welding equipment — where the magnetic trip holds off until roughly 10–20× rated current.
At 30 °C ambient the breaker carries the full 50 A; at 40 °C it derates to 47.36 A, at 45 °C to 46 A, and at 55 °C to 43.09 A.
Degree of pollution 2, overvoltage category III.
The 5SL4450-8 is supplied through independent distribution channels. Volume purchases are quoted to order against an RFQ; availability and current pricing are confirmed at quote time.
The overall depth is 76 mm, with an installation depth of 70 mm. The width is 72 mm (4 modular width units), height 90 mm.
Both are 4-pole SENTRON MCBs on the same DIN-rail footprint (4 MW units), so mechanical fit is identical. The key difference is the tripping characteristic: 5SL4450-8 is D curve (high inrush), while 5SL4363-7 is a different curve — verify the load's inrush profile before swapping.
The 5SL4450-8 carries a 10 kA breaking capacity per both EN 60898 and IEC 60947-2. It is halogen-free and silicon-free, supporting RoHS/REACH compliance. UL certification is typical for the SENTRON series; confirm the specific UL file number with the supplier at quote time.
No related articles