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Siemens 5SY7120-6 — 1-Pole MCB (DIN Rail)

Siemens 5SY7120-6 SENTRON MCB, 1P B-Char 15kA, 400V AC

MPN5SY7120-6

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Siemens SENTRON 5SY7120-6, 1-pole miniature circuit breaker, B characteristic, 15 kA breaking capacity per EN 60898, 400 V AC, 18 mm wide, IP20.

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Siemens 5SY7120-6 datasheet (PDF)

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

Specifications

5SY7120-6 — Identification
Parameter	Value
Product designation	Miniature circuit breaker
Brand name	SENTRON
Number of poles	1
Application suitability	Mechanical engineering / industry

5SY7120-6 — Electrical & Protection
Parameter	Value
Tripping characteristic class	B
Rated value (EN 60898)	15 kA
Energy limitation class	3
Overvoltage category	III

5SY7120-6 — Mounting & Connection
Parameter	Value
Mounting position	any
Fastening method	Quick assembly system
Combined terminal, top	Yes
Combined terminal, bottom	Yes
Width	18 mm
Height	90 mm
Depth	76 mm
Installation depth	70 mm
Modular width units	1
Torque, min.	-40 °C
Torque, max.	75 °C
Sealable	Yes

5SY7120-6 — Environmental
Parameter	Value
IP protection class	IP20, with connected conductors
Pollution degree	3
Halogen-free	Yes
Silicone-free	Yes

Product details

What this MCB does and where it fits

The Siemens 5SY7120-6 is a 1-pole miniature circuit breaker from the SENTRON series, rated 400 V AC at 50/60 Hz with a B tripping characteristic.

Breaking capacity and what it means for your panel

This breaker carries a 15 kA breaking capacity per EN 60898 and 25 kA per IEC 60947-2 at 400 V AC. For DC circuits, it is rated 15 kA per IEC 60947-2.

Environmental and installation details

Degree of pollution 3 (conductive pollution, typical for industrial enclosures), overvoltage category III. Top and bottom terminals accept combined wiring; the unit is sealable for tamper-proofing.