The Siemens 5SY7406-6 is a 4-pole miniature circuit breaker from the SENTRON 5SY7 family, rated 6 A at 400 V AC with a B tripping characteristic — meaning it trips between 3 and 5 times rated current, suited for resistive and light inductive loads where inrush is modest. It carries a 15 kA breaking capacity under EN 60898 and 40 kA under IEC 60947-2, so it can handle high prospective fault currents in industrial panels without cascading upstream. The DC rating maxes out at 72 V, useful for control circuits or battery-backed loads in the same enclosure.
Siemens 5SY7406-6 SENTRON MCB, 4P, 6A, B Curve, 15/40 kA
MPN5SY7406-6
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Siemens SENTRON 5SY7 series miniature circuit breaker, 4-pole, 6 A, B tripping characteristic, 15 kA (EN 60898) / 40 kA (IEC 60947-2), 400 V AC, 72 V DC max, IP20, halogen-free, silicon-free.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Type / order code | 5SY7 |
| 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 | 6 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) | B |
| Rated breaking capacity (Icn), per EN 60898 | 15 kA |
| Rated breaking capacity, per IEC 60947-2 | 40 kA |
| Breaking capacity, AC (UL 1077 / CSA C22.2 No.235) | 5 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
Where can I buy 5SY7406-6?
This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at the time of quote.
What conductor sizes does 5SY7406-6 accept?
The terminals accept solid and stranded conductors from 0.75 mm² up to 35 mm², covering most branch-circuit wiring sizes without adapters.
What is the breaking capacity of 5SY7406-6?
It is rated 15 kA under EN 60898 and 40 kA under IEC 60947-2 at 400 V AC, giving headroom for high-fault installations.
Will 5SY7406-6 drop into a panel specified around 5SY7140-8CC without rewiring?
Both are 4-pole SENTRON MCBs with the same DIN-rail footprint and terminal range, so mechanical fit is identical. However, 5SY7140-8CC is a 40 A C-curve device — the 6 A B-curve of 5SY7406-6 is a different rating and characteristic, so the branch circuit must be re-evaluated for load and coordination.
MPN
5SY7406-6