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

Siemens 5SY6420-8CC SENTRON MCB, 4P D-Curve 20 A, 6 kA

MPN5SY6420-8CC

Siemens SENTRON 5SY6420-8CC, 4-pole miniature circuit breaker, D tripping characteristic, 20 A rated current at 400 V AC, 6 kA breaking capacity per EN 60898, 5 kA per UL 1077.

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Siemens 5SY6420-8CC datasheet (PDF)

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

Specifications

5SY6420-8CC — Identification
Parameter	Value
Type / order code	5SY6CC
Brand name	SENTRON
Application suitability	Mechanical engineering / industry

5SY6420-8CC — Ratings
Parameter	Value
Number of poles	4
Pole configuration	4P
Rated current (In), AC	400 V
Rated current (In), AC	20 A
Rated voltage, AC (multi-phase)	440 V
Rated voltage, AC (single-phase)	440 V
Rated voltage, DC (max.)	72 V
Voltage type	AC
Rated frequency	50/60 Hz

5SY6420-8CC — Protection
Parameter	Value
Tripping characteristic (trip curve)	D
Rated breaking capacity (Icn), per EN 60898	6 kA
Breaking capacity, AC (UL 1077 / CSA C22.2 No.235)	5 kA
Overvoltage category	III
Degree of protection (IP)	IP20, with connected conductors
Neutral conductor switching	No
Touch protection	Yes

5SY6420-8CC — Mechanical
Parameter	Value
Width in modular units	4
Width	72 mm
Height	90 mm
Depth	76 mm
Installation depth	70 mm
Mounting position	any
Combined terminal, top	Yes
Combined terminal, bottom	Yes
Sealable	Yes

5SY6420-8CC — 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

5SY6420-8CC — Performance
Parameter	Value
Mechanical service life (switching cycles, typ.)	10 000

Product details

20 A D-curve MCB for motor and inductive loads

Breaking capacity is 6 kA per EN 60898 and 5 kA per UL 1077 / CSA C22.2 No. 235, so it handles fault currents up to that level without upstream coordination issues in most distribution panels.

Panel fit and wiring constraints

Footprint is 72 mm wide (4 width units), 90 mm high, 76 mm deep, with an installation depth of 70 mm.

The part is sealable and touch-protected per the design. Overvoltage category III means it is rated for fixed-installation distribution boards, not for downstream equipment-level protection. Humidity tolerance is 95% at 55 °C, derating to 35% at 75 °C.