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Siemens 5SY8363-8 — 3-Pole MCB (DIN Rail)

Siemens 5SY8363-8 SENTRON MCB, 3P, D-curve, 20 kA IEC

MPN5SY8363-8
Active

Siemens SENTRON, miniature circuit breaker, 5SY8363-8, 3-pole, D tripping characteristic, 20 kA at 400 V AC per IEC 60947-2, 5 kA per UL 1077, 3 MW units wide.

Siemens 5SY8363-8 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY8363-8 — Identification
ParameterValue
Brand nameSENTRON
Number of poles3
Pole configuration3P
Suitability for operationMechanical engineering / industry
5SY8363-8 — Protection
ParameterValue
Tripping characteristic (curve)D
Breaking capacity per IEC 60947-220 kA
Overvoltage categoryIII
IP protection classIP20, with connected conductors
Pollution degree3
5SY8363-8 — Electrical
ParameterValue
Rated voltage (AC, multi-phase)440 V
Voltage type (AC/DC)AC
Supply frequency range50/60 Hz
Power loss per pole at rated current (AC, hot)5 W
Mechanical service life (operating cycles, typ.)10 000
Neutral conductor switchingNo
Rated voltage (AC, single-phase)440 V
5SY8363-8 — Mechanical
ParameterValue
Modular width units3
Mounting positionany
Width54 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
Accepts supplementary devicesYes
5SY8363-8 — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes
Influence of surrounding temperaturemax. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C
Vibration resistance (IEC 60068-2-6)±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz

Product details

The D curve means magnetic trip is set at 10–20× rated current, so it avoids nuisance tripping on transformer inrush or motor start-up — standard choice for motor branch circuits and inductive loads.

Combined top and bottom terminals simplify daisy-chaining busbars.

Environmental and compliance profile

Halogen-free and silicon-free construction; complies with IEC 60947-2 and UL 1077, with a UL 1077 / CSA C22.2 No. 235 interrupting rating of 5 kA.

Vibration and mechanical endurance

Vibration tested per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz — suitable for installation on machinery with moderate vibration, like conveyor drives or compressor skids. Mechanical life of 10 000 operating cycles typical — not a frequent-switching device, but adequate for its role as a backup overcurrent protector behind a contactor.

Frequently asked questions

What is the breaking capacity of 5SY8363-8?

20 kA at 400 V AC per IEC 60947-2, 15 kA at 60 V DC per IEC 60947-2, and 5 kA per UL 1077 / CSA C22.2 No. 235.

Will 5SY8363-8 drop into a panel designed for 5SY4140-7?

Both are 3-pole SENTRON MCBs with the same 3-MW DIN-rail footprint, so physical fit is identical. The key difference is the tripping curve — 5SY8363-8 is D-curve (motor/inductive loads), while 5SY4140-7 is B-curve (general-purpose/lighting). Verify the curve matches your branch circuit before swapping.

What compliance documentation does Siemens provide for 5SY8363-8?

The MCB is certified to IEC 60947-2 and UL 1077 / CSA C22.2 No. 235. It is halogen-free and silicon-free, supporting RoHS/REACH compliance requirements.

Where can I buy 5SY8363-8 and how is it quoted?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no minimum order quantity for standard requests.

MPN
5SY8363-8