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Siemens 5SY8420-7 — 4-Pole MCB (DIN Rail)

Siemens 5SY8420-7 SENTRON MCB, 4P C-Curve, 30 kA IEC, UL 107

MPN5SY8420-7
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Siemens SENTRON 5SY8420-7, 4-pole miniature circuit breaker, C-curve, 30 kA interrupting capacity per IEC 60947-2, 15 kA DC, UL 1077 listed, 4 MW units wide.

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

Specifications

5SY8420-7 — Identification
ParameterValue
Brand nameSENTRON
Application suitabilityMechanical engineering / industry
5SY8420-7 — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated voltage, AC (multi-phase)440 V
5SY8420-7 — Protection
ParameterValue
Tripping characteristic (trip curve)C
Overvoltage categoryIII
Pollution degree3
Degree of protection (IP)IP20, with connected conductors
5SY8420-7 — Mechanical
ParameterValue
Width in modular units4
Width72 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Fastening / mounting methodQuick assembly system
Mounting positionany
Combined terminal, topYes
Combined terminal, bottomYes
Tightening torque, max.75 °C
Tightening torque, min.-40 °C
SealableYes
5SY8420-7 — 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
5SY8420-7 — Performance
ParameterValue
Power loss per pole, AC (hot state, at In)1.7 W

Product details

4-pole C-curve MCB for panel and machinery protection

The Siemens 5SY8420-7 is a SENTRON 4-pole miniature circuit breaker with C-curve tripping characteristic, rated for 30 kA interrupting capacity per IEC 60947-2 and 15 kA at DC per the same standard. It carries a UL 1077 listing alongside the IEC rating, so it fits both IEC-spec panels and North American supplementary-protection applications without a separate part number.

Combined top and bottom terminals simplify busbar and load-side wiring — no need to flip the breaker for feed direction.

Environmental range and derating

Rated for ambient temperatures from -40 °C to 75 °C, with humidity derating: max 95% RH up to 55 °C, then 55% up to 70 °C, and 35% at 75 °C. Vibration resistance per IEC 60068-2-6 (±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz) confirms it holds up on machinery or near conveyors.

Frequently asked questions

What compliance documentation does Siemens provide for 5SY8420-7?

The breaker is certified to IEC / EN 60947-2 and UL 1077, and carries a halogen-free and silicon-free construction. It is rated for overvoltage category III and pollution degree 3, which covers fixed industrial installations.

Where can I buy 5SY8420-7 and get current pricing?

This part is sourced to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time.

Will 5SY8420-7 drop into a panel that was specified around 5SY4116-7CV without rewiring?

Both are 4-pole SENTRON MCBs on the same DIN-rail footprint, but the 5SY8420-7 is 4 MW wide (72 mm) versus the 5SY4116-7CV's 2 MW width. The panel must have 4 MW of rail space available, and the busbar or feed arrangement may need adjustment for the wider body. Terminal positions and wiring access are the same, but the physical space difference is real — measure the existing cutout before assuming a drop-in swap.

MPN
5SY8420-7