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Siemens 5SL6403-7 — 4-Pole MCB (DIN Rail)

Siemens 5SL6403-7 SENTRON MCB, 4P C-Curve 3A 6kA

MPN5SL6403-7
Active

Siemens SENTRON 5SL6403-7, 4-pole miniature circuit breaker, C-curve, 3 A rated at 400 V AC, 6 kA breaking capacity.

Siemens 5SL6403-7 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SL6403-7 — Identification
ParameterValue
Brand nameSENTRON
Application suitabilityResidential buildings/infrastructure
5SL6403-7 — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated current (In), AC3 A
Rated voltage, AC (multi-phase)440 V
Rated voltage, DC (max.)72 V
Voltage typeAC
5SL6403-7 — Protection
ParameterValue
Tripping characteristic (trip curve)C
Rated breaking capacity (Icn), per EN 608986 kA
Rated breaking capacity, per IEC 60947-26 kA
Energy limitation class3
Overvoltage categoryIII
Pollution degree2
Degree of protection (IP)IP20, with connected conductors
Neutral conductor switchingNo
Touch protectionYes
5SL6403-7 — Mechanical
ParameterValue
Width in modular units4
Width72 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Mounting positionany
Tightening torque, max.75 °C
Tightening torque, min.-40 °C
SealableYes
5SL6403-7 — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes
Influence of ambient temperature (derating)Periodically +55°C, max. 95% humidity

Product details

The Siemens 5SL6403-7 is a SENTRON 4-pole miniature circuit breaker (MCB) with a C tripping characteristic, rated 3 A at 400 V AC. Its 6 kA breaking capacity, certified to both EN 60898 and IEC 60947-2, covers the majority of residential and light commercial fault-current scenarios — enough for a sub-distribution board feeding general-purpose socket circuits or lighting, but undersized for industrial main feeders where 10 kA or higher is typical.

At 30 °C ambient it holds a full 3 A; at 55 °C it derates to 2.62 A — account for the thermal stack inside a crowded enclosure. The 72 V DC maximum rating means this MCB can switch DC control circuits up to that voltage, but its primary duty is AC.

Mounting position is unrestricted. Halogen-free and silicon-free construction simplifies disposal and avoids outgassing concerns in sensitive environments.

Frequently asked questions

Where can I buy the 5SL6403-7?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

What is the difference between 5SL6403-7 and 5SL4363-7?

The 5SL4363-7 is a 4-pole C-curve MCB with a higher 6 A rating. The physical footprint (72 mm wide, 4 MW) and breaking capacity are identical, so it drops into the same panel position without rewiring — only the overcurrent threshold changes. If your load requires 3 A protection, the 5SL6403-7 is the correct choice.

What is the depth of the 5SL6403-7?

The depth is 76 mm, with an installation depth of 70 mm. This is the dimension from the DIN-rail front to the back of the breaker — verify enclosure depth clearance before mounting.

Will the 5SL6403-7 fit a panel designed for the 5SL4363-7?

Yes. Both share the same 72 mm width (4 MW), 90 mm height, and 76 mm depth. The mounting position, DIN-rail clip, and terminal layout are identical — no rewiring or panel modification needed.

What compliance documentation does Siemens provide for the 5SL6403-7?

As a SENTRON MCB, it carries IEC/EN 60898 and IEC 60947-2 certifications for breaking capacity. The construction is halogen-free and silicon-free. Standard Siemens documentation includes a CE declaration of conformity and RoHS compliance information — request these with your RFQ if needed for quality documentation.

MPN
5SL6403-7