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Siemens 5SL3240-6 — 2-Pole MCB (DIN Rail)

Siemens 5SL3240-6 SENTRON MCB, 2P 40A B-Curve 4.5kA

MPN5SL3240-6

Siemens SENTRON 5SL3 series, 5SL3240-6 miniature circuit breaker, 2-pole, 40 A, B-curve, 4.5 kA, 400 V AC, 36 mm wide.

Siemens 5SL3240-6 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SL3240-6 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Application environmentResidential buildings/infrastructure
5SL3240-6 — Electrical
ParameterValue
Number of poles2
5SL3240-6 — Protection
ParameterValue
Tripping characteristic classB
Overvoltage category3
5SL3240-6 — Mechanical
ParameterValue
Width36 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Mounting positionany
Protection degree (IP)IP20, with connected conductors

Product details

What this 40 A B-curve MCB is for

The Siemens 5SL3240-6 is a 2-pole miniature circuit breaker from the SENTRON 5SL3 family, rated 40 A at 400 V AC with a B-curve tripping characteristic. Two poles switched, no neutral switching — this is a 2P (line/line) breaker for single-phase or two-phase circuits.

Mounting position any, so vertical or horizontal rail layouts work. Terminals accept solid or stranded copper from 0.75 mm² up to 25 mm²; torque to 2.5–3 N·m with a screwdriver. Installation depth 70 mm leaves room behind the rail for wiring channels.

Frequently asked questions

Where can I buy 5SL3240-6 and get a price?

Sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current pricing and availability — confirmed at quote time.

What is the depth of 5SL3240-6?

Depth is 76 mm, width 36 mm (2 width units), height 90 mm. Installation depth behind the panel face is 70 mm.

What wire sizes does 5SL3240-6 accept?

Solid and stranded copper from 0.75 mm² up to 25 mm². Torque terminals to 2.5–3 N·m.

Will 5SL3240-6 drop into a panel specified around 5SL3120-6MB?

Both are 2-pole SENTRON 5SL3 MCBs on the same DIN-rail footprint (36 mm wide), so mechanical fit is identical. The difference is rating: 5SL3240-6 is 40 A B-curve; 5SL3120-6MB is 20 A B-curve. No rewiring needed if the circuit ampacity matches the 40 A rating.

MPN
5SL3240-6