Siemens 5SY4401-8 is a 4-pole SENTRON miniature circuit breaker rated 1 A with D-curve tripping. Designed for industrial panel protection, its D characteristic provides 10–20x In trip tolerance, handling motor inrush and transformer energization without nuisance trips. Breaking capacity: 10 kA standard, 35 kA industrial, 15 kA DC, 5 kA for UL. Rated 400 V AC, overvoltage category III. Rated for ambient temperatures from -40 °C to 75 °C, pollution degree 3, and vibration up to 50 m/s². Mounts in any position, occupies 4 modular-width units (72 mm wide), and uses a quick-assembly system. Terminal comb availability allows busbar feed across poles.
Siemens 5SY4401-8 SENTRON MCB, 1A 4P D Curve, 10kA
MPN5SY4401-8
Active
Siemens SENTRON 5SY4401-8, 4-pole miniature circuit breaker, 1 A, D tripping characteristic, 10 kA (EN 60898) / 35 kA (IEC 60947-2), 400 V AC.
$340.44Ref. price · indicative, final on quote
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MOQ1 pcs
Sourced new & surplus through independent channelsListing updated Jun 2026
Specifications
Identification
| Parameter | Value |
|---|---|
| Brand name | SENTRON |
| Application suitability | Mechanical engineering / industry |
Ratings
| Parameter | Value |
|---|---|
| Number of poles | 4 |
| Pole configuration | 4P |
| Rated current (In), AC | 400 V |
| Rated voltage, AC (multi-phase) | 440 V |
| Rated voltage, AC (single-phase) | 440 V |
| Voltage type | AC |
Protection
| Parameter | Value |
|---|---|
| Tripping characteristic (trip curve) | D |
| Rated breaking capacity (Icn), per EN 60898 | 10 kA |
| Rated breaking capacity, per IEC 60947-2 | 35 kA |
| Breaking capacity, AC (UL 1077 / CSA C22.2 No.235) | 5 kA |
| Overvoltage category | III |
| Pollution degree | 3 |
| Degree of protection (IP) | IP20, with connected conductors |
| Neutral conductor switching | No |
| Touch protection | Yes |
Mechanical
| Parameter | Value |
|---|---|
| Width in modular units | 4 |
| Width | 72 mm |
| Height | 90 mm |
| Depth | 76 mm |
| Installation depth | 70 mm |
| Fastening / mounting method | Quick assembly system |
| Mounting position | any |
| Combined terminal, top | Yes |
| Combined terminal, bottom | Yes |
| Tightening torque, max. | 75 °C |
| Tightening torque, min. | -40 °C |
| Sealable | Yes |
Environmental
| 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 |
Performance
| Parameter | Value |
|---|---|
| Mechanical service life (switching cycles, typ.) | 10 000 |
Product details
MPN
5SY4401-8