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Siemens 5SY4420-8 — 4-Pole MCB (DIN Rail)

Siemens 5SY4420-8 SENTRON 4-Pole MCB, D-Curve, 400V AC

MPN5SY4420-8

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Siemens SENTRON 5SY4420-8, 4-pole miniature circuit breaker, D-curve, 400 V AC, 10 kA (EN 60898) / 20 kA (IEC 60947-2), 72 mm width, DIN rail mount.

$76.20Ref. price · indicative, final on quote

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Siemens 5SY4420-8 datasheet (PDF)

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

Specifications

5SY4420-8 — Identification
Parameter	Value
Brand name	SENTRON
Application suitability	Mechanical engineering / industry

5SY4420-8 — Ratings
Parameter	Value
Number of poles	4
Pole configuration	4P
Rated voltage, AC (multi-phase)	440 V

5SY4420-8 — Protection
Parameter	Value
Tripping characteristic (trip curve)	D
Overvoltage category	III
Pollution degree	3
Degree of protection (IP)	IP20, with connected conductors

5SY4420-8 — Mechanical
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

5SY4420-8 — Environmental
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

5SY4420-8 — Performance
Parameter	Value
Power loss per pole, AC (hot state, at In)	1.6 W

Product details

D-curve trip and breaking capacity

The 5SY4420-8: Under UL 1077 it carries 5 kA. That spread covers most industrial panel SCCR requirements across Europe and North America.

DC circuit capability and neutral handling

Yes, this breaker can be used on DC circuits — it carries a DC rating of 15 kA at 60 V (max 72 V) per IEC 60947-2. That covers 48 VDC control power and 60 VDC solar-combiner applications within the voltage ceiling. The 5SY4420-8 does not switch the neutral conductor — it is a 4-pole breaker with all poles protected, but the neutral is not switched. If your circuit requires a switched neutral, this is not the part.

Frequently asked questions

Does the 5SY4420-8 require a neutral conductor?

No. The breaker does not switch the neutral conductor — all four poles are protected but the neutral is not switched. If your circuit requires a switched neutral, this breaker is not the correct choice.