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Siemens 5SY6408-7 — 4-Pole MCB (DIN Rail)

Siemens 5SY6408-7 SENTRON MCB, 4P C-Curve 8A, 6/15kA

MPN5SY6408-7
Active

Siemens SENTRON 5SY6408-7, 4-pole miniature circuit breaker, C-curve, 8 A rated, 6 kA per EN 60898 / 15 kA per IEC 60947-2, 4 MW, IP20.

Siemens 5SY6408-7 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY6408-7 — Identification
ParameterValue
Brand nameSENTRON
Application suitabilityMechanical engineering / industry
5SY6408-7 — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated current (In), AC8 A
Rated voltage, AC (multi-phase)440 V
Rated voltage, AC (single-phase)440 V
5SY6408-7 — Protection
ParameterValue
Tripping characteristic (trip curve)C
Energy limitation class3
Overvoltage categoryIII
Pollution degree3
Degree of protection (IP)IP20, with connected conductors
5SY6408-7 — Mechanical
ParameterValue
Width in modular units4
Width72 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Fastening / mounting methodQuick assembly system
Mounting positionany
Combined terminal, topYes
Combined terminal, bottomYes
Tightening torque, max.75 °C
Tightening torque, min.-40 °C
SealableYes
5SY6408-7 — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes
Influence of ambient temperature (derating)max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C
5SY6408-7 — Performance
ParameterValue
Mechanical service life (switching cycles, typ.)10 000

Product details

It's a current-production part — no lifecycle concerns for a BOM freeze. Rated breaking capacity is 6 kA per EN 60898-1 and 15 kA per IEC 60947-2 / UL1077 — the higher figure matters when you need SCCR headroom for a 400 V industrial panel.

Derating and environment

At 35 °C ambient it carries the full 8 A; at 40 °C it's 7.51 A, at 50 °C it's 6.99 A, and at 55 °C it's 6.72 A. If your panel runs hot, size the load to the derated number, not the nameplate.

Halogen-free and silicon-free construction, sealable for lockout/tagout. Overvoltage category III and energy limitation class 3.

Frequently asked questions

What is the breaking capacity of 5SY6408-7?

6 kA per EN 60898-1 and 15 kA per IEC 60947-2 / UL1077. The 15 kA rating is the one to use for SCCR calculations in industrial gear.

What is the C-curve on this MCB?

The C characteristic trips between 5 and 10 times rated current (40–80 A for this 8 A unit). It's the standard choice for motor and transformer branch circuits where a short inrush is expected.

Where can I buy 5SY6408-7?

It's sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — send a request and I'll get you a number.

MPN
5SY6408-7