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Siemens 5SY3040-6 — 1-Pole MCB (DIN Rail)

Siemens 5SY3040-6 SENTRON MCB, 40A B-Curve 1P+N 4.5kA

MPN5SY3040-6

Siemens SENTRON 5SY3040-6 miniature circuit breaker, 1P+N, 40 A, B-curve, 4.5 kA per EN 60898, 230 V AC, 1 MW wide, standard rail mount.

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

Specifications

5SY3040-6 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
5SY3040-6 — Electrical & Protection
ParameterValue
Tripping characteristic classB
Rated value (EN 60898)4.5 kA
Overvoltage categoryIII
5SY3040-6 — Mounting & Connection
ParameterValue
Mounting positionany
Combined terminal, topNo
Combined terminal, bottomNo
Width18 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Torque, min.17.7 lbf·in
Torque, max.22.1 lbf·in
SealableYes
5SY3040-6 — Environmental
ParameterValue
IP protection classIP20, with connected conductors
Halogen-freeYes
Silicone-freeYes

Product details

The Siemens 5SY3040-6 is a SENTRON miniature circuit breaker rated 40 A at 230 V AC with a B tripping characteristic and 4.5 kA breaking capacity per EN 60898. It is a 1P+N unit — one protected pole plus a switched neutral — in a single 18 mm width unit (1 MW). Not for motor starting or high-inrush loads; those want a C or D curve.

Mounting and fit

Width is 18 mm (1 MW). Terminals accept the standard tightening torque range of 17.7 to 22.1 lbf·in. The unit is sealable and touch-protected per the product feature listing. IP20 with connected conductors — fine inside a panel, not for wet or washdown zones.

Frequently asked questions

Will 5SY3040-6 drop into a panel that was specified around 5SY6008-7 without rewiring?

Yes, the physical footprint is identical — both are 18 mm wide, 76 mm deep, snap onto standard DIN rail, and share the same terminal torque specs. The 5SY6008-7 is an 8 A C-curve unit; the 5SY3040-6 is 40 A B-curve. The swap is mechanical but the load protection curve and ampacity differ, so verify the circuit's coordination study before substituting.

What is 5SY3040-6's listed depth (76 mm) on this component line?

The overall depth is 76 mm; installation depth (behind the panel face) is 70 mm.

What is 5SY3040-6's listed width (18 mm) on this component line?

Width is 18 mm, which corresponds to 1 modular width unit (1 MW).

How do I get current pricing and availability for 5SY3040-6?

Submit an RFQ against this order code. Pricing and stock are confirmed at quote time through independent distribution channels; no real-time figures are published here.

MPN
5SY3040-6