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Siemens 5SY7420-8 — Miniature Circuit Breakers (MCB)

Siemens 5SY7420-8 SENTRON MCB, 4P, D-curve, 15kA/25kA

MPN5SY7420-8
Active

Siemens SENTRON 5SY7420-8, 4-pole miniature circuit breaker, D tripping characteristic, 15 kA (EN 60898) / 25 kA (IEC 60947-2) breaking capacity, 400 V AC, 72 mm wide.

Siemens 5SY7420-8 datasheet (PDF)
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

5SY7420-8 — Ratings
ParameterValue
Overvoltage categoryIII
5SY7420-8 — Mechanical
ParameterValue
Width72 mm
Height90 mm
Depth76 mm

Product details

What this MCB does on the line

At 72 mm wide (4 modular units), it occupies standard DIN-rail space; the quick-assembly system and any mounting position simplify panel integration.

Breaking capacity and standards — what the ratings mean

The 25 kA rating under IEC 60947-2 covers industrial installations where fault currents are higher — that's the number a panel designer uses for SCCR coordination. For UL 1077 / CSA C22.2 No.235, the breaker is listed at 5 kA, which is typical for supplementary protection in North American control panels.

Ambient temperature range is -40 °C to 75 °C, with derating for humidity (95% at 55 °C, 55% at 70 °C, 35% at 75 °C). Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5 to 25 Hz and 50 m/s² at 25 to 150 Hz, which is typical for industrial machinery.

Frequently asked questions

How do I get current pricing and availability for 5SY7420-8?

Submit an RFQ through this listing. The part is sourced through independent distribution; pricing and stock are confirmed at quote time.

What is the closest functional second-source to 5SY7420-8?

The 5SY4304-7CV is a 4-pole MCB from the same SENTRON family, but it uses a C tripping characteristic (5–10x In) versus the D curve (10–20x In) of the 5SY7420-8. If your load has high inrush (motors, transformers), the D curve is the correct choice; the C curve may nuisance-trip on startup.

What compliance documentation does Siemens provide for 5SY7420-8?

The breaker is certified to IEC/EN 60898-1, IEC/EN 60947-2, UL 1077, and CSA C22.2 No.235. It is halogen-free and silicon-free. Standard documentation includes the declaration of conformity and manufacturer's test reports.

Will 5SY7420-8 drop into a panel specified around 5SY4304-7CV without rewiring?

Yes — both are 4-pole, 72 mm wide (4 MW), and mount on the same DIN-rail footprint. The only difference is the tripping curve; wiring and busbar connections are identical.

MPN
5SY7420-8