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Siemens 5SL6340-6 — 3-Pole MCB (DIN Rail)

Siemens 5SL6340-6 SENTRON MCB, 3P, 40A, B Curve, 6kA

MPN5SL6340-6
Active

Siemens SENTRON 5SL6340-6, miniature circuit breaker, 3-pole, B characteristic, 40 A rated current, 6 kA breaking capacity at 400 V AC, 3 modular width units.

Siemens 5SL6340-6 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SL6340-6 — Identification
ParameterValue
Brand nameSENTRON
Number of poles3
Pole configuration3P
Suitability for operationResidential buildings/infrastructure
5SL6340-6 — Protection
ParameterValue
Tripping characteristic (curve)B
Breaking capacity per EN 608986 kA
Breaking capacity per IEC 60947-26 kA
Overvoltage categoryIII
IP protection classIP20, with connected conductors
Energy limitation class3
Pollution degree2
5SL6340-6 — Electrical
ParameterValue
Rated voltage (AC, multi-phase)440 V
Voltage type (AC/DC)AC
Supply frequency range50/60 Hz
Power loss per pole at rated current (AC, hot)3.4 W
Mechanical service life (operating cycles, typ.)10 000
5SL6340-6 — Mechanical
ParameterValue
Modular width units3
Mounting positionany
Width54 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Terminal tightening torque, max.75 °C
Terminal tightening torque, min.-40 °C
SealableYes
Accepts supplementary devicesYes
5SL6340-6 — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes

Product details

Rated for 40 A, B curve, 6 kA — what that means for the panel

The Siemens 5SL6340-6 is a 3-pole SENTRON miniature circuit breaker rated 40 A with a B tripping characteristic, breaking 6 kA at 400 V AC per both EN 60898 and IEC 60947-2. Overvoltage category III (distribution-level) and pollution degree 2 confirm it is intended for fixed installation inside a distribution board, not on the factory floor.

Fit, footprint, and integration into the enclosure

Mounting position is unrestricted — can be installed sideways or upside down in a tight enclosure without derating the 40 A rating. IP20 with connected conductors, so it requires a distribution board cover for touch protection. Sealable, halogen-free, and silicon-free — relevant for clean-room or marine-adjacent builds where outgassing or seal integrity matters.

Power loss and thermal considerations

For a 3-pole breaker at full load, that is 10.2 W total dissipated inside the enclosure — a factor when calculating temperature rise in a densely packed distribution board.

Frequently asked questions

Where can I buy 5SL6340-6 and get a price?

The 5SL6340-6 is 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 commercial offer.

Will 5SL6340-6 drop into a panel specified around 5SL4363-7?

Yes, the 5SL6340-6 and the 5SL4363-7 share identical dimensions (76 mm depth, 54 mm width, 90 mm height), mounting position, installation depth, and enclosure class. The difference is the tripping characteristic: 5SL6340-6 is B curve, 5SL4363-7 is C curve. If the panel design calls for C curve (5–10× In instantaneous trip) for motor or transformer loads, swapping to B curve may cause nuisance tripping on inrush. For resistive or general-purpose circuits where B curve is appropriate, the physical fit is a direct drop-in.

What is the breaking capacity of 5SL6340-6?

6 kA at 400 V AC per both EN 60898 and IEC 60947-2. This is the rated short-circuit breaking capacity — the maximum fault current the breaker can safely interrupt.

MPN
5SL6340-6