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Siemens 5SY6406-8 — 4-Pole MCB (DIN Rail)

Siemens SENTRON 5SY6406-8 MCB, 4P D 6A, 6kA EN/30kA IEC

MPN5SY6406-8

Siemens SENTRON 5SY6 series, 5SY6406-8, 4-pole miniature circuit breaker, D tripping characteristic, rated current 6 A, 400 V AC, breaking capacity 6 kA (EN 60898) / 30 kA (IEC 60947-2).

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

Specifications

5SY6406-8 — Identification
ParameterValue
Type / order code5SY6
Brand nameSENTRON
Application suitabilityMechanical engineering / industry
5SY6406-8 — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated current (In), AC400 V
Rated current (In), AC6 A
Rated voltage, AC (multi-phase)440 V
Rated voltage, AC (single-phase)440 V
Rated voltage, DC (max.)72 V
Voltage typeAC
Rated frequency50/60 Hz
5SY6406-8 — Protection
ParameterValue
Tripping characteristic (trip curve)D
Rated breaking capacity (Icn), per EN 608986 kA
Rated breaking capacity, per IEC 60947-230 kA
Breaking capacity, AC (UL 1077 / CSA C22.2 No.235)5 kA
Overvoltage categoryIII
Degree of protection (IP)IP20, with connected conductors
Neutral conductor switchingNo
Touch protectionYes
5SY6406-8 — Mechanical
ParameterValue
Width in modular units4
Width72 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Mounting positionany
Combined terminal, topYes
Combined terminal, bottomYes
SealableYes
5SY6406-8 — 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
5SY6406-8 — Performance
ParameterValue
Mechanical service life (switching cycles, typ.)10 000

Product details

Breaking capacity — the real-world fault rating

This breaker carries two breaking-capacity ratings because it is certified under two standards. At 400 V AC, it interrupts 6 kA per EN 60898 (the domestic / light commercial standard) and 30 kA per IEC 60947-2 (the industrial standard). For DC circuits, the IEC 60947-2 rating is 15 kA at 72 V DC maximum. UL 1077 / CSA C22.2 No. 235 listing gives 5 kA at AC for North American acceptance.

The combined terminal design (screw clamp or similar) is the same top and bottom, so you can feed from either end without a special busbar adapter. Touch protection is built in (IP20 with connected conductors), and the terminals are sealable for panel-lockout programs.

Humidity tolerance: 95% at 55 °C, derating to 35% at 75 °C. Mounting position is any orientation. Overvoltage category III, pollution degree typical for industrial panels. Compliance documentation (RoHS, REACH, CE, UL, CSA) is available with the product — the UL 1077 listing at 5 kA covers North American acceptance.

Frequently asked questions

What is the breaking capacity of the 5SY6406-8 at 400 V AC?

6 kA per EN 60898 and 30 kA per IEC 60947-2. The 30 kA rating is the one that governs in industrial panels with high available fault current.

How does the 5SY6406-8 compare to the 5SY6602-8?

The 5SY6602-8 is a 2-pole version of the same 5SY6 series with a D-curve and 6 A rating. The 5SY6406-8 is 4-pole (4P). Both share the same breaking capacities, terminal ranges, and physical width per pole. If your panel was wired for a 4-pole breaker, the 5SY6602-8 will not drop in — it is half the width and lacks the third and fourth poles.

Where can I buy the 5SY6406-8 and how is it quoted?

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

What wire sizes does the 5SY6406-8 accept?

Both solid and stranded copper from 0.75 mm² up to 35 mm², at both top and bottom terminals.

What compliance documentation comes with the 5SY6406-8?

RoHS and REACH declarations are standard. The breaker carries CE marking (EN 60898, IEC 60947-2) and UL 1077 / CSA C22.2 No. 235 listing at 5 kA for North America.

MPN
5SY6406-8