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Siemens 5SY6420-8 — 4-Pole MCB (DIN Rail)

Siemens 5SY6420-8 SENTRON MCB, 4P D 20 A, 6 kA EN 60898

MPN5SY6420-8

Siemens SENTRON 5SY6 series, miniature circuit breaker, 4-pole, D-curve, 20 A, 400 V AC, 6 kA (EN 60898) / 15 kA (IEC 60947-2).

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

5SY6420-8 — Identification
ParameterValue
Type / order code5SY6
Brand nameSENTRON
Application suitabilityMechanical engineering / industry
5SY6420-8 — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated current (In), AC400 V
Rated current (In), AC20 A
Rated voltage, AC (multi-phase)440 V
Rated voltage, AC (single-phase)440 V
Rated voltage, DC (max.)72 V
Voltage typeAC
Rated frequency50/60 Hz
5SY6420-8 — Protection
ParameterValue
Tripping characteristic (trip curve)D
Rated breaking capacity (Icn), per EN 608986 kA
Rated breaking capacity, per IEC 60947-215 kA
Breaking capacity, AC (UL 1077 / CSA C22.2 No.235)5 kA
Overvoltage categoryIII
Degree of protection (IP)IP20, with connected conductors
Neutral conductor switchingNo
Touch protectionYes
5SY6420-8 — Mechanical
ParameterValue
Width in modular units4
Width72 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Mounting positionany
Combined terminal, topYes
Combined terminal, bottomYes
SealableYes
5SY6420-8 — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes
Influence of ambient temperature (derating)max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C
5SY6420-8 — Performance
ParameterValue
Mechanical service life (switching cycles, typ.)10 000

Product details

The Siemens 5SY6420-8 is a SENTRON miniature circuit breaker in the 5SY6 design — 4-pole, D-curve, rated 20 A at 400 V AC. The D characteristic means it handles inrush peaks from motor or transformer loads without nuisance tripping; typical for industrial branch circuits with high starting currents. Combined top and bottom terminals simplify daisy-chaining.

Integration & approvals

Ambient operating range -25 to +55 °C. Rated for overvoltage category III (distribution-level). Touch protection is built in. Approvals include UL 1077 and CSA C22.2 No. 235 at 5 kA (AC) — supplementary protector listing for North American panels. The EN 60898 and IEC 60947-2 ratings cover European and global industrial specs.

Frequently asked questions

What is the breaking capacity of 5SY6420-8?

6 kA per EN 60898 (household-type distribution boards) and 15 kA per IEC 60947-2 (industrial panels). The 15 kA figure is the one to use for SCCR coordination in most industrial designs.

What conductor sizes does 5SY6420-8 accept?

Solid or stranded copper from 0.75 mm² up to 35 mm² — covers the full range for a 20 A branch circuit and downstream subfeeds.

Where can I buy 5SY6420-8 and how is it quoted?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no fixed stock count or price is published here.

MPN
5SY6420-8