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
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026
Specifications
| Parameter | Value |
|---|---|
| Overvoltage category | III |
| Parameter | Value |
|---|---|
| Width | 72 mm |
| Height | 90 mm |
| Depth | 76 mm |
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