Skip to main content
Log in
Siemens 5SY8310-8BB08 — 3-Pole MCB (DIN Rail)

Siemens 5SY8310-8BB08 SENTRON MCB, 3P D10, 40 kA IEC

MPN5SY8310-8BB08
Active

Siemens SENTRON 5SY8310-8BB08, 3-pole miniature circuit breaker, D tripping characteristic, 10 A rated current, 40 kA breaking capacity at 440 V AC per IEC 60947-2, magnetic-only trip, IP20 with connected conductors.

Siemens 5SY8310-8BB08 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY8310-8BB08 — Identification
ParameterValue
Brand nameSENTRON
Number of poles3
Pole configuration3P
Suitability for operationMechanical engineering / industry
5SY8310-8BB08 — Protection
ParameterValue
Tripping characteristic (curve)D
Breaking capacity per IEC 60947-240 kA
Overvoltage categoryIII
IP protection classIP20, with connected conductors
Pollution degree3
5SY8310-8BB08 — 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)0.9 W
Mechanical service life (operating cycles, typ.)10 000
Neutral conductor switchingNo
Rated voltage (AC, single-phase)440 V
5SY8310-8BB08 — 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
5SY8310-8BB08 — 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

It's a magnetic-only trip unit — no thermal bimetal, so it's built for applications where short-circuit protection is the priority and overloads are handled upstream or by the load itself.

Rated 10 A continuous, it'll hold a 4 kW motor on 400 V three-phase without tripping on start. The 40 kA IEC 60947-2 rating is the headline number for industrial panels; the UL 1077 listing at 5 kA covers North American branch circuits. Pollution degree 3 (industrial environment) and overvoltage category III (distribution level) mean it's rated for the dirt and spikes you see in a real panel.

Mounts in any position. IP20 with connected conductors is standard for enclosed panels; keep the front cover on.

The 5SY series is a broad SENTRON family; this variant is the magnetic-only D10 3-pole. No direct replacement needed — it's the active part.

Frequently asked questions

Where can I buy the 5SY8310-8BB08 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.

What is the breaking capacity of the 5SY8310-8BB08?

40 kA at 440 V AC per IEC 60947-2, and 5 kA per UL 1077 / CSA C22.2 No.235.

What tripping curve does the 5SY8310-8BB08 use?

D-curve, magnetic-only trip — no thermal element. Designed for motor and transformer primary protection where inrush is high.

Will the 5SY8310-8BB08 fit a panel designed for a 5SY4304-7CV?

Both are 3-pole, DIN-rail mount, same modular width per pole. The 5SY8310-8BB08 is a D10 magnetic-only; the 5SY4304-7CV is a different rating and characteristic — check the specific current and curve before swapping.

MPN
5SY8310-8BB08