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Siemens 5SY6450-7 — 4-Pole MCB (DIN Rail)

Siemens 5SY6450-7 SENTRON MCB, 4P, C-curve, 50 A, 6/10 kA

MPN5SY6450-7
Active

Siemens SENTRON 5SY6450-7, 4-pole miniature circuit breaker, C-curve, 50 A rated, 6 kA per EN 60898 / 10 kA per IEC 60947-2, 50/60 Hz, IP20, halogen-free, current production.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY6450-7 — Identification
ParameterValue
Brand nameSENTRON
Application suitabilityMechanical engineering / industry
5SY6450-7 — Ratings
ParameterValue
Number of poles4
Pole configuration4P
Rated voltage, AC (multi-phase)440 V
5SY6450-7 — Protection
ParameterValue
Tripping characteristic (trip curve)C
Energy limitation class3
Overvoltage categoryIII
Pollution degree3
Degree of protection (IP)IP20, with connected conductors
5SY6450-7 — Mechanical
ParameterValue
Width in modular units4
Width72 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Fastening / mounting methodQuick assembly system
Mounting positionany
Combined terminal, topYes
Combined terminal, bottomYes
Tightening torque, max.75 °C
Tightening torque, min.-40 °C
SealableYes
5SY6450-7 — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes
Influence of ambient temperature (derating)max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C
5SY6450-7 — Performance
ParameterValue
Power loss per pole, AC (hot state, at In)3.8 W

Product details

The breaker is certified to IEC / EN 60898-1 (6 kA) and IEC / EN 60947-2 (10 kA), plus UL1077 — so it meets both residential and industrial coordination requirements.

The 50 A rating holds at 35 °C ambient; at 40 °C it derates to 48 A, at 45 °C to 47 A, at 50 °C to 45.95 A, and at 55 °C to 44.9 A. That means a panel running at 50 °C loses about 8 % of the nominal current — factor that into your load schedule if the breaker shares a crowded enclosure.

Breaking capacity and DC rating

For DC circuits the breaker is rated 15 kA per IEC 60947-2, which covers many battery-backed or rectifier-fed loads.

Depth is 76 mm (installation depth 70 mm), height 90 mm, width 72 mm (4 MW). The breaker is sealable, halogen-free and silicon-free — important for clean-room or food-bev zones where outgassing contaminants can’t be tolerated.

Frequently asked questions

Where can I buy 5SY6450-7 and how do I get a price?

The 5SY6450-7 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.

What is the breaking capacity of 5SY6450-7?

The 5SY6450-7 has a breaking capacity of 6 kA per EN 60898-1 and 10 kA per IEC 60947-2; for DC circuits it is rated 15 kA per IEC 60947-2.

What compliance documentation does 5SY6450-7 carry?

The 5SY6450-7 is certified to IEC / EN 60898-1, IEC / EN 60947-2, and UL1077. It is halogen-free and silicon-free.

Will 5SY6450-7 drop into a panel specified around 5SY4140-7 without rewiring?

Both are 4-pole SENTRON MCBs with the same 72 mm width (4 MW) and DIN-rail mounting, so the physical fit is identical. The 5SY6450-7 is a 50 A C-curve; the 5SY4140-7 is a 40 A C-curve. If the panel was wired for 40 A, the 50 A breaker will fit mechanically but the circuit protection rating changes — verify the cable and load ratings before swapping.

MPN
5SY6450-7