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Siemens 5SY4304-6 — 3-Pole MCB (DIN Rail)

Siemens 5SY4304-6 SENTRON MCB, 3P, 4A, B-Curve, 10kA

MPN5SY4304-6
Active

Siemens SENTRON miniature circuit breaker, 5SY4304-6, 3-pole, 4 A, B characteristic, 10 kA breaking capacity per EN 60898, 35 kA per IEC 60947-2, IP20, halogen-free, sealable.

Siemens 5SY4304-6 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY4304-6 — Identification
ParameterValue
Brand nameSENTRON
Number of poles3
Pole configuration3P
Suitability for operationMechanical engineering / industry
5SY4304-6 — Protection
ParameterValue
Tripping characteristic (curve)B
Breaking capacity per EN 6089810 kA
Breaking capacity per IEC 60947-235 kA
Overvoltage categoryIII
IP protection classIP20, with connected conductors
Energy limitation class3
Pollution degree3
5SY4304-6 — Electrical
ParameterValue
Rated current (AC)4 A
Rated voltage (AC, multi-phase)440 V
5SY4304-6 — Mechanical
ParameterValue
Modular width units2
Mounting positionany
Width36 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Terminal tightening torque, max.75 °C
Terminal tightening torque, min.-40 °C
Combined terminal, topYes
Combined terminal, bottomYes
Fastening methodQuick assembly system
SealableYes
5SY4304-6 — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes
Influence of surrounding temperaturemax. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C

Product details

Siemens 5SY4304-6 SENTRON MCB — 3-pole, 4 A, B-curve

The B curve (3–5× In instantaneous trip) is standard for resistive and general-purpose loads: lighting, small heating circuits, control transformers.

Rated 4 A at 35 °C, derated to 3.76 A at 40 °C and 3.22 A at 60 °C — the thermal derating curve is published for panel environments where ambient runs above the 35 °C reference point. If your panel hits 50 °C, the breaker is good for 3.5 A continuous. The 10 kA (EN 60898) and 35 kA (IEC 60947-2) ratings mean the same hardware qualifies for both residential/commercial distribution boards (EN 60898) and industrial switchgear (IEC 60947-2) where prospective short-circuit current can be higher. The 15 kA DC rating per IEC 60947-2 covers DC circuits up to that fault level. IP20 with connected conductors means the terminals are finger-safe only when wired — no washdown rating; this stays in a dry enclosure.

Snap-on DIN rail mounting via the quick-assembly system; 36 mm width (2 MW), 76 mm depth, 90 mm height. Installation depth is 70 mm. Sealable for tamper-proof locking. Halogen-free and silicon-free construction — suitable for clean-room or semiconductor fab environments where outgassing is a concern.

Frequently asked questions

What is the breaking capacity of the 5SY4304-6?

10 kA per EN 60898 and 35 kA per IEC 60947-2 at AC, plus 15 kA at DC per IEC 60947-2.

What is the 5SY4304-6 used for?

It is a 3-pole miniature circuit breaker with B characteristic, rated 4 A, used for overcurrent and short-circuit protection of resistive and general-purpose AC loads in distribution boards and industrial control panels.

Where can I buy the 5SY4304-6?

Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.

Will the 5SY4304-6 drop into a panel that was specified around the 5SY4304-7CV?

Both are 3-pole SENTRON MCBs with the same 36 mm width and DIN-rail mounting, so mechanical fit is identical. However, the 5SY4304-7CV carries a different tripping characteristic or rating — verify the B-curve and 4 A rating match your circuit design before substituting.

What compliance documentation does Siemens provide for the 5SY4304-6?

The breaker is halogen-free and silicon-free; it is classified per IEC 81346-2 and DIN EN 61346-2 as function F. Overvoltage category III, pollution degree 3. Standard Siemens declarations (CE, UKCA, RoHS, REACH) apply — request the specific declaration at order time.

MPN
5SY4304-6