It snaps onto a DIN rail (4 modular width units) and occupies 72 mm of panel width — a standard footprint for a 4P MCB in a distribution board or control cabinet. The higher IEC rating matters if you are specifying per the industrial standard — the 15 kA figure governs for motor control centre feeders. Ambient temperature derating is built in: at 40 °C the continuous current drops to 19.04 A, at 50 °C to 18.04 A. If the panel runs hot near a press or drive cabinet, factor that in — the B-curve still holds its magnetic trip at 3–5× In, but thermal trip timing shifts with the ambient.
Siemens 5SY6420-6 SENTRON MCB, 4P B-Char 20A 6kA
MPN5SY6420-6
Active
Siemens SENTRON miniature circuit breaker, 5SY6420-6, 4-pole, B characteristic, 20 A, 6 kA per EN 60898, 15 kA per IEC 60947-2, IP20, 4 MW wide.
$31.75Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Brand name | SENTRON |
| Application suitability | Mechanical engineering / industry |
| Parameter | Value |
|---|---|
| Number of poles | 4 |
| Pole configuration | 4P |
| Rated current (In), AC | 20 A |
| Rated voltage, AC (multi-phase) | 440 V |
| Rated voltage, AC (single-phase) | 440 V |
| Voltage type | AC |
| Parameter | Value |
|---|---|
| Tripping characteristic (trip curve) | B |
| Rated breaking capacity (Icn), per EN 60898 | 6 kA |
| Rated breaking capacity, per IEC 60947-2 | 15 kA |
| Breaking capacity, AC (UL 1077 / CSA C22.2 No.235) | 5 kA |
| Energy limitation class | 3 |
| Overvoltage category | III |
| Pollution degree | 3 |
| 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 |
| 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 |
| 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 |
Product details
Frequently asked questions
Where can I buy 5SY6420-6 and how do I get a price?
This part is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current pricing and availability — no stock count or price is published here.
What is 5SY6420-6's listed depth (76 mm) on this component line?
The overall depth is 76 mm; the installation depth behind the panel face is 70 mm. That 6 mm difference is the terminal height above the DIN rail.
What is 5SY6420-6's listed width (72 mm) on this component line?
Width is 72 mm, which corresponds to 4 modular width units (4 MW) on a standard DIN-rail grid. Each MW is 18 mm, so this breaker occupies the same slot count as any 4-pole MCB.
What compliance documentation does this brand provide for 5SY6420-6 (RoHS, REACH, UL, IEC)?
The part carries IEC 60947-2 and EN 60898 ratings, and is halogen-free and silicon-free. For RoHS/REACH declarations and UL file status, request the manufacturer's compliance package with your RFQ — these are standard Siemens SENTRON supporting documents.
MPN
5SY6420-6