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Siemens 5SY7306-8 — 3-Pole MCB (DIN Rail)

Siemens SENTRON 5SY7306-8 MCB, 3P D-Curve, 15/40 kA

MPN5SY7306-8
Active

Siemens SENTRON miniature circuit breaker, 3-pole, D tripping characteristic, 15 kA (EN 60898) / 40 kA (IEC 60947-2), 400 V AC, width 54 mm, depth 76 mm.

Siemens 5SY7306-8 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY7306-8 — Identification
ParameterValue
Brand nameSENTRON
Number of poles3
Pole configuration3P
Suitability for operationMechanical engineering / industry
5SY7306-8 — Protection
ParameterValue
Tripping characteristic (curve)D
Breaking capacity per EN 6089815 kA
Breaking capacity per IEC 60947-240 kA
Overvoltage categoryIII
IP protection classIP20, with connected conductors
Pollution degree3
5SY7306-8 — 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)1.6 W
Mechanical service life (operating cycles, typ.)10 000
Neutral conductor switchingNo
Rated voltage (AC, single-phase)440 V
5SY7306-8 — 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
5SY7306-8 — 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 Siemens SENTRON 5SY7306-8 is a 3-pole miniature circuit breaker with a D tripping characteristic, rated for 15 kA per EN 60898 and 40 kA per IEC 60947-2. It's a current-production part, so no last-time-buy scramble; we source it against an RFQ.

Three breaking-capacity ratings cover the major standards: 15 kA at 400 V AC per EN 60898 (the household/commercial standard), 40 kA at 400 V AC per IEC 60947-2 (industrial, for higher-fault panels), and 5 kA per UL 1077 (North American supplementary protection). DC side: 15 kA at 60 V per IEC 60947-2, with a max DC operating voltage of 72 V. That covers 48 VDC control buses and some battery circuits, but not 125 VDC telecom plants.

The 90 mm height is the body; clearance above for the toggle is about 10 mm. IP20 with conductors connected — fine inside a closed panel, not for wet areas.

Frequently asked questions

What is the breaking capacity of 5SY7306-8?

15 kA per EN 60898 at 400 V AC, 40 kA per IEC 60947-2 at 400 V AC, and 5 kA per UL 1077. For DC circuits it's 15 kA at 60 V per IEC 60947-2.

What does the D-curve mean on this breaker?

The D tripping characteristic allows the breaker to ride through high inrush currents typical of motor starts, transformer energization, and welding loads — it trips magnetically at 10–20× In, compared to 5–10× for a C-curve. That prevents nuisance trips on inductive loads while still providing short-circuit protection.

Where can I buy 5SY7306-8 and how is it quoted?

This part is 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 listed here.

Will 5SY7306-8 drop into a panel specified around 5SY4116-7CV?

The 5SY7306-8 is a 3-pole D-curve breaker with 15/40 kA breaking capacity, while the 5SY4116-7CV is a different rating and curve. Both share the same SENTRON 5SY family footprint — 3 modular widths (54 mm), same DIN-rail mounting and terminal layout — so mechanical fit is identical. The deciding factor is the electrical rating: verify that the 5SY7306-8's current rating and D-curve match your circuit requirements before swapping.

MPN
5SY7306-8