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Siemens 5SL1220-7MB — 2-Pole MCB (DIN Rail)

Siemens 5SL1220-7MB SENTRON MCB, 2P C-Curve 20A, 3kA IEC

MPN5SL1220-7MB

Siemens SENTRON 5SL1220-7MB miniature circuit breaker, 2-pole, tripping characteristic C, 20 A rated current, 3 kA breaking capacity per IEC 60947-2, 230/400 V AC, 72 V DC.

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Siemens 5SL1220-7MB datasheet (PDF)

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

Specifications

5SL1220-7MB — Identification
Parameter	Value
Product designation	Miniature circuit breaker
Brand name	SENTRON
Application environment	Residential buildings/infrastructure

5SL1220-7MB — Electrical
Parameter	Value
Number of poles	2
Supply voltage at AC rated value	230 V

5SL1220-7MB — Protection
Parameter	Value
Tripping characteristic class	C
Overvoltage category	III

5SL1220-7MB — Mechanical
Parameter	Value
Modular width units	2
Width	36 mm
Height	90 mm
Depth	76 mm
Installation depth	70 mm
Mounting position	any
Min.	-40 °C
Max.	75 °C
Protection degree (IP)	IP20, with connected conductors

5SL1220-7MB — Environmental
Parameter	Value
Pollution degree	2

5SL1220-7MB — Specifications
Parameter	Value
With single-phase operation at AC rated value	253 V

Product details

The Siemens SENTRON 5SL1220-7MB is a 2-pole miniature circuit breaker (MCB) with a C-curve trip characteristic, rated at 20 A per pole.

Voltage and duty coverage

Rated for single-phase operation at 253 V AC and multi-phase up to 440 V AC at 50/60 Hz. DC maximum is 72 V.

Occupies 2 modular width units (36 mm) on a standard DIN rail, with a depth of 76 mm and height of 90 mm. Installation depth behind the panel surface is 70 mm. Mounting position is unrestricted — vertical, horizontal, or upside-down on the rail — which simplifies layout in crowded enclosures.

Frequently asked questions

Will the 5SL1220-7MB drop into a panel specified around the 5SL4363-7 without rewiring?

No — the 5SL4363-7 is a 3-pole device occupying 3 modular width units (54 mm), while the 5SL1220-7MB is 2-pole at 36 mm. The DIN-rail mounting is the same, but the pole count, busbar arrangement, and branch circuit wiring differ. A panel designed for the 3-pole unit would require busbar reconfiguration and possibly a filler blank to adapt.