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Siemens 5SN6340-8CP — 3-Pole MCB (DIN Rail)

Siemens 5SN6340-8CP SENTRON MCB, 3-Pole, 40A, C-Curve, 10kA

MPN5SN6340-8CP

Siemens SENTRON 5SN series, MCB 5SN, 3-pole, 40 A, C-curve, 400 V AC, 10 kA (IEC 60947-2), 6 kA (EN 60898), 3 MWU, DIN rail mount.

Siemens 5SN6340-8CP datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SN6340-8CP — Identification
ParameterValue
Number of poles3
5SN6340-8CP — Protection
ParameterValue
Breaking capacity per EN 608986 kA
Breaking capacity per IEC 60947-210 kA
5SN6340-8CP — Electrical
ParameterValue
Rated voltage (AC, multi-phase)440 V
Power loss per pole at rated current (AC, hot)3 W
Mechanical service life (operating cycles, typ.)10 000
Rated voltage (AC, single-phase)440 V
5SN6340-8CP — Mechanical
ParameterValue
Modular width units3
Width54 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Terminal tightening torque, max.75 °C
Terminal tightening torque, min.-40 °C

Product details

Siemens 5SN6340-8CP — 40 A, 3-Pole C-Curve MCB for Panel Protection

Breaking capacity is 10 kA per IEC 60947-2 for industrial duty, and 6 kA per EN 60898 for residential/infrastructure applications — the higher figure governs when the breaker is specified in an industrial panel with available fault current up to 10 kA. For DC circuits, the maximum rated voltage is 72 V.

The C-curve trips at 5–10× rated current.

DIN-Rail Fit and Wiring

The 3 MWU width matches standard SENTRON spacing. Solid conductor cross-section up to 35 mm² is accepted, enough for the 40 A feed. Terminal torque and strip length follow standard Siemens SENTRON practice — use ferrules on stranded wire for reliable connection.

Frequently asked questions

Will 5SN6340-8CP drop into a panel built for 5SL4363-7?

Yes, the 5SN6340-8CP shares the same 76 mm depth, 54 mm width (3 MWU), 90 mm height, and 70 mm installation depth as the 5SL4363-7. It fits the same DIN-rail cutout and wiring space without panel modification.

What voltage ratings does 5SN6340-8CP support?

It is rated 400 V AC at 50 Hz, with a maximum of 440 V AC for multi-phase or single-phase operation. For DC circuits, the maximum rated voltage is 72 V.

MPN
5SN6340-8CP