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Siemens 5SN6120-8CP — 1-Pole MCB (DIN Rail)

Siemens 5SN6120-8CP MCB, 1-pole, 400 VAC, 6/15 kA

MPN5SN6120-8CP

Siemens SENTRON 5SN series, MCB 5SN, 1-pole, 400 VAC, 50 Hz, 6 kA (EN 60898) / 15 kA (IEC 60947-2), tripping characteristic C, 72 VDC max, 1 module width (18 mm), depth 76 mm.

Siemens 5SN6120-8CP datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SN6120-8CP — Identification
ParameterValue
Number of poles1
5SN6120-8CP — Mounting & Connection
ParameterValue
Width18 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Modular width units1
Torque, min.-40 °C
Torque, max.75 °C

Product details

The Siemens 5SN6120-8CP is a 1-pole miniature circuit breaker (MCB) from the SENTRON 5SN series, sized at one modular width (18 mm) with a 76 mm depth and 70 mm installation depth. It protects a single-phase or multi-phase branch circuit at 400 VAC, 50 Hz, with a tripping characteristic C.

Rated for 400 VAC multi-phase operation and 440 VAC maximum, with single-phase operation also at 440 VAC. The DC rating tops out at 72 V — so it works on 48 VDC control circuits but not 125 VDC battery banks. Accepts solid conductors up to 35 mm², which covers most panel feed-throughs and downstream distribution.

Panel integration

Snap-on mounting to DIN rail (35 mm).

Frequently asked questions

How do I get current pricing and availability for 5SN6120-8CP?

The part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

What is 5SN6120-8CP's listed depth (76 mm) on this component line?

The total depth is 76 mm, with an installation depth of 70 mm — the difference accounts for the front toggle and terminal clearance.

What is 5SN6120-8CP's listed width (18 mm) on this component line?

Width is 18 mm, which is one modular unit (1 MW) — standard single-pole MCB footprint on DIN rail.

Will 5SN6120-8CP drop into a panel that was specified around 5SY4116-7CV without rewiring?

Both share the same 76 mm depth, 18 mm width, 70 mm installation depth, and 1-pole form factor, so the mechanical fit is identical. The 5SN6120-8CP carries a 6 kA EN 60898 rating versus the 5SY4116-7CV's 15 kA IEC 60947-2 rating, so selectivity coordination should be rechecked if the original panel was designed around the higher breaking capacity.

What compliance documentation does Siemens provide for 5SN6120-8CP?

The breaker is designed and tested to EN 60898 (6 kA) and IEC 60947-2 (15 kA). Standard Siemens documentation includes CE declaration of conformity and, where applicable, UKCA. RoHS and REACH compliance is standard for the SENTRON 5SN series, though specific certificates should be requested at quote time for your quality file.

MPN
5SN6120-8CP