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Siemens 5SY3040-7WM — 1-Pole MCB (DIN Rail)

Siemens 5SY3040-7WM SENTRON MCB, 1P+N, C-curve 40 A, 4.5 kA

MPN5SY3040-7WM

Siemens SENTRON miniature circuit breaker, 1P+N, C-curve, 40 A, 4.5 kA at 230 V AC, 1 MW width unit, depth 70 mm.

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

Specifications

5SY3040-7WM — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
5SY3040-7WM — Electrical & Protection
ParameterValue
Tripping characteristic classC
Rated value (EN 60898)4.5 kA
Overvoltage categoryIII
5SY3040-7WM — 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
5SY3040-7WM — Environmental
ParameterValue
IP protection classIP20, with connected conductors
Halogen-freeYes
Silicone-freeYes

Product details

Fit and footprint

The 5SY3040-7WM: Snaps onto standard DIN rail (35 mm), takes up a single width unit (18 mm), and needs 70 mm of clearance behind the panel face for the 76 mm total depth. Mount it in any position — no derating for upside-down or sideways. Terminal torque spec is 17.7 to 22.1 lbf·in, so a standard screwdriver with a torque-limiting handle keeps connections consistent.

This part is listed at a current lifecycle stage, so it's still a standard catalogue item from Siemens. No last-time-buy or phase-out notice to worry about.

Frequently asked questions

Where can I buy 5SY3040-7WM and get a price?

We source this part to order against an RFQ. Submit your quantity and delivery requirements, and we'll confirm availability and current pricing at quote time.

Will 5SY3040-7WM drop into a panel specified around 5SY6020-7KL without rewiring?

Yes. Both breakers share the same 18 mm width, 76 mm depth, 70 mm installation depth, standard-rail mounting, and 1P+N pole configuration. The 5SY3040-7WM is a 40 A C-curve; the 5SY6020-7KL is a 20 A C-curve. The physical swap is a straight drop-in, but you must verify the load current and upstream protection coordination for the higher 40 A rating.

What is the breaking capacity of 5SY3040-7WM?

It is rated 4.5 kA at 230 V AC per EN 60898. That is the maximum fault current it can safely interrupt under standard conditions.

Does 5SY3040-7WM switch the neutral?

Yes, it has a product function for neutral conductor switching, so both the phase and neutral are disconnected when the breaker trips or is manually opened.

MPN
5SY3040-7WM