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

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

MPN5SL3120-6

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

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

Specifications

5SL3120-6 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Number of poles1
Pole design1P
Application suitabilityResidential buildings/infrastructure
5SL3120-6 — Electrical & Protection
ParameterValue
Tripping characteristic classB
Energy limitation class3
Overvoltage categoryIII
5SL3120-6 — Mounting & Connection
ParameterValue
Mounting positionany
Width18 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Modular width units1
Torque, min.-40 °C
Torque, max.75 °C
SealableYes
5SL3120-6 — Environmental
ParameterValue
IP protection classIP20, with connected conductors
Pollution degree2
Halogen-freeYes
Silicone-freeYes

Product details

SENTRON 5SL3120-6 — 1-pole B-curve MCB, 20 A

It breaks faults up to 4.5 kA per EN 60898 and 5 kA per IEC 60947-2 at 400 V AC — enough for residential and light commercial distribution boards where the prospective short-circuit current stays under those thresholds. Not the right choice for motor circuits with high starting current; that calls for a C or D curve. At 40 °C ambient the continuous rating derates to 18.79 A, and at 55 °C it drops to 16.8 A.

Snap-on DIN rail mount, 1 modular unit wide (18 mm). Sealable design and touch protection are built in.

Frequently asked questions

What is the breaking capacity of 5SL3120-6?

4.5 kA per EN 60898 and 5 kA per IEC 60947-2 at 400 V AC. The higher IEC figure gives some headroom for industrial coordination studies.

What is the width of 5SL3120-6?

18 mm, which is 1 modular unit on a DIN rail. Depth is 76 mm.

Where can I buy 5SL3120-6?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

Does 5SL3120-6 replace 5SL4120-7CC?

No direct drop-in replacement relationship is documented. The 5SL3120-6 is a 1-pole B-curve 20 A MCB; the 5SL4120-7CC is a different variant. Verify the specific ratings and curve before substituting.

MPN
5SL3120-6