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Siemens 5SL3120-6MB — 1-Pole MCB (DIN Rail)

Siemens 5SL3120-6MB SENTRON MCB, 1P B 20A 4.5kA

MPN5SL3120-6MB
Active

Siemens SENTRON 5SL3120-6MB miniature circuit breaker, 1-pole, B characteristic, 20 A rated current, 4.5 kA breaking capacity per EN 60898, 230/400 V AC.

Siemens 5SL3120-6MB datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SL3120-6MB — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Number of poles1
Application suitabilityResidential buildings/infrastructure
5SL3120-6MB — Electrical & Protection
ParameterValue
Tripping characteristic classB
Rated value (EN 60898)4.5 kA
Overvoltage category3
5SL3120-6MB — Mounting & Connection
ParameterValue
Mounting positionany
Width18 mm
Height90 mm
Depth76 mm
Installation depth70 mm
SealableYes
5SL3120-6MB — Environmental
ParameterValue
IP protection classIP20, with connected conductors
Halogen-freeYes
Silicone-freeYes

Product details

The Siemens 5SL3120-6MB is a SENTRON 5SL series miniature circuit breaker — a 1-pole, B-curve device rated 20 A with a 4.5 kA breaking capacity per EN 60898.

Single-pole switching only — no neutral pole integrated. The 18 mm width (one modular unit) means it snaps into any standard DIN-rail enclosure alongside other 1-MU devices. Terminals accept solid or stranded copper from 0.75 to 25 mm², with a recommended tightening torque of 2.5 to 3 N·m. The 76 mm depth (70 mm installation depth) fits standard shallow enclosures — verify gland-plate clearance if the board is back-to-wall.

Touch protection is integrated on the terminals.

Frequently asked questions

Where can I buy 5SL3120-6MB and how do I get a price?

This part is sourced to order against an RFQ through independent distribution channels. Submit a quote request for current availability and pricing — confirmed at quote time, not before.

What is 5SL3120-6MB's listed depth?

The overall depth is 76 mm, with an installation depth of 70 mm — fits standard shallow enclosures.

What wire sizes does 5SL3120-6MB accept?

Terminals accept solid and stranded copper from 0.75 mm² up to 25 mm².

Will 5SL3120-6MB drop into a panel specified around 5SY6008-7 without rewiring?

Both are 1-pole, 18 mm wide MCBs on the same DIN-rail footprint, so mechanical fit is identical. However, the 5SY6008-7 is a different series with potentially different breaking capacity or characteristic — verify the specific rating of that alternate before substituting without recalculating the circuit protection coordination.

What compliance documentation does Siemens provide for 5SL3120-6MB?

The breaker carries EN 60898 rating for 4.5 kA breaking capacity, is halogen-free and silicon-free, and is classified per DIN EN 61346-2 and DIN EN 81346-2. Standard Siemens declaration of conformity and material compliance (RoHS/REACH) is available on request.

MPN
5SL3120-6MB