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Siemens 5SY5240-6KK11 — 2-Pole MCB (DIN Rail)

Siemens 5SY5240-6KK11 SENTRON MCB, 2P 40A B-Curve, 10kA

MPN5SY5240-6KK11

Siemens SENTRON 5SY5240-6KK11, miniature circuit breaker, 2-pole 40 A, B tripping characteristic, 10 kA breaking capacity per EN 60898, 2 MW, IP20.

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

Specifications

5SY5240-6KK11 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Application environmentuniversal current
5SY5240-6KK11 — Electrical
ParameterValue
Number of poles2
5SY5240-6KK11 — Protection
ParameterValue
Tripping characteristic classB
Overvoltage categoryIII
5SY5240-6KK11 — Mechanical
ParameterValue
Modular width units2
Width36 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Mounting positionany
Min.-40 °C
Max.75 °C
Protection degree (IP)IP20, with connected conductors
5SY5240-6KK11 — Environmental
ParameterValue
Pollution degree3
5SY5240-6KK11 — Specifications
ParameterValue
Energy Limitation Class3

Product details

SENTRON 5SY5240-6KK11 — 40 A B-curve MCB for universal-current protection

Its 10 kA breaking capacity per EN 60898 (AC) and 10 kA per EN 60898-2 (DC at 440 V) means it can safely interrupt faults up to that level without cascading upstream — a key figure for selectivity studies on a distribution board.

The B-curve trips between 3 and 5 times rated current, so at 40 A that's 120–200 A magnetic trip threshold — suited for resistive and general-purpose loads, not high-inrush motor circuits (where a C or D curve would be the call). The 40 A rating holds at 35 °C ambient; derate to 37.56 A at 40 °C, 34.96 A at 45 °C, and 33.6 A at 55 °C. The 2-pole design (2 MW wide, 36 mm per module) handles single-phase or DC line-plus-neutral protection.

Frequently asked questions

What is the breaking capacity of 5SY5240-6KK11?

10 kA per EN 60898 for AC circuits, and 10 kA per EN 60898-2 for DC circuits at 440 V. The DC rating is the one to watch if you are protecting a DC distribution bus.

Will 5SY5240-6KK11 drop into a panel that was specified around 5SY5240-7 without rewiring?

The 5SY5240-7 variant shares the same 2-pole 40 A B-curve footprint (36 mm wide, 70 mm installation depth) and DIN-rail mounting. The -6KK11 suffix indicates the railway-rated, halogen-free, silicon-free construction — so it is a drop-in replacement if the panel requires those material specs. If the panel does not need railway compliance, the standard 5SY5240-7 is the cost-optimized alternative.

How do I get current pricing and availability for 5SY5240-6KK11?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time.

What compliance documentation does this brand provide for 5SY5240-6KK11?

The SENTRON series carries IEC/EN 60898-1 and EN 60898-2 certification (the DC standard). The railway-rated variant includes halogen-free and silicon-free declarations. For RoHS, REACH, and UL documentation, request the manufacturer's declaration at quote time — these are typically provided with the shipment.

MPN
5SY5240-6KK11