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Siemens 5SY4308-7CC — 3-Pole MCB (DIN Rail)

Siemens 5SY4308-7CC SENTRON MCB, 3P C-curve 8A 10kA

MPN5SY4308-7CC

Siemens SENTRON 5SY4308-7CC, miniature circuit breaker, 3-pole, C tripping characteristic, 8 A rated current, 10 kA breaking capacity per EN 60898, 50/60 Hz AC.

Siemens 5SY4308-7CC datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY4308-7CC — Identification
ParameterValue
Brand nameSENTRON
Number of poles3
Pole configuration3P
Suitability for operationMechanical engineering / industry
5SY4308-7CC — Protection
ParameterValue
Tripping characteristic (curve)C
Overvoltage categoryIII
IP protection classIP20, with connected conductors
Energy limitation class3
Pollution degree3
5SY4308-7CC — Electrical
ParameterValue
Rated current (AC)8 A
Rated voltage (AC, multi-phase)440 V
5SY4308-7CC — 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
5SY4308-7CC — 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 5SY4308-7CC — SENTRON 3-pole MCB, C-curve, 8 A

Thermal derating and environmental limits

The 5SY4308-7CC carries a full temperature-derating table from 35 °C to 55 °C, not just a single ambient rating. At 35 °C it holds the full 8 A; at 45 °C it is 7 A; at 55 °C it is 6.25 A. Above 55 °C the humidity limit tightens — max 55% RH at 70 °C, max 35% RH at 75 °C — so a hot, humid environment (e.g., a non-conditioned electrical room in a tropical plant) needs a ventilation or enclosure-sizing check. Energy limitation class 3 indicates it limits let-through energy in a fault, reducing arc-flash stress on downstream components.

Frequently asked questions

What is the breaking capacity of 5SY4308-7CC?

10 kA per EN 60898 at 50/60 Hz AC. This is the standard breaking capacity for a C-curve MCB protecting branch circuits in commercial and light industrial panels.

Will 5SY4308-7CC drop into a panel specified around 5SY7210-7CC?

Yes — same 3-pole C-curve footprint, same 3-module width, same DIN-rail mounting. The only difference is the 5SY4308-7CC is rated 8 A versus 10 A for the 5SY7210-7CC, so the load circuit must be sized accordingly. No rewiring or bus-bar change is needed.

Where can I buy 5SY4308-7CC 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 stock count or price is published here.

MPN
5SY4308-7CC