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Siemens 5SY4301-8CV — 3-Pole MCB (DIN Rail)

Siemens 5SY4301-8CV MCB, 1A 3P D-Curve, 15 kA IEC 60947-2

MPN5SY4301-8CV

Siemens 5SY4301-8CV, 3-pole miniature circuit breaker, 1 A rated current, D tripping characteristic, 15 kA breaking capacity at 400 V AC per IEC 60947-2, 3 modular width units.

Siemens 5SY4301-8CV datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY4301-8CV — Identification
ParameterValue
Number of poles3
Pole configuration3P
Suitability for operationMechanical engineering / industry
5SY4301-8CV — Protection
ParameterValue
Tripping characteristic (curve)D
Overvoltage categoryIII
IP protection classIP20, with connected conductors
Pollution degree3
5SY4301-8CV — Electrical
ParameterValue
Rated current (AC)1 A
Rated voltage (AC, multi-phase)440 V
Neutral conductor switchingNo
5SY4301-8CV — 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
5SY4301-8CV — 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

1 A D-curve MCB for motor and transformer branch circuits

The D-curve holds through 10–20× rated current for short-duration starts, then clears on sustained overload.

At 35 °C ambient the breaker carries the full 1 A; at 40 °C it derates to 0.93 A, at 45 °C to 0.89 A, and at 50 °C and 55 °C to 0.8 A. Mount in any position — the quick-assembly system snaps onto standard DIN rail. Three modular width units (54 mm) of DIN space.

Halogen-free and silicon-free construction. Humidity tolerance: max 95% RH up to 55 °C, derating to 35% RH at 75 °C. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz. Sealable terminals (top and bottom combined).

Frequently asked questions

Where can I buy 5SY4301-8CV and get current pricing?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time.

Will 5SY4301-8CV drop into a panel specified for 5SY4301-7CV?

Both are 3-pole, 1 A, D-curve MCBs in the same 5SY4 family with identical dimensions (54 mm width, 76 mm depth), so the 8CV variant is a direct mechanical fit. The difference is in the breaking capacity rating — verify the 7CV's rating against your panel's available fault current before swapping.

What compliance documentation does Siemens provide for 5SY4301-8CV?

The breaker is designed and tested to IEC / EN 60947-2. It carries a CE marking for the European market. Halogen-free and silicon-free construction is confirmed. For specific declarations (RoHS, REACH, UL file number), request the manufacturer's current compliance documents with your RFQ.

MPN
5SY4301-8CV