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Siemens 5SY6663-6 — 4-Pole MCB (DIN Rail)

Siemens 5SY6663-6 SENTRON MCB, 4P, 63 A, B Curve, 6/10 kA

MPN5SY6663-6
Active

Siemens SENTRON miniature circuit breaker, 5SY6663-6, 4-pole (3P+N), 63 A, B characteristic, 6 kA (EN 60898) / 10 kA (IEC 60947-2), IP20, 4 MW, current production.

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

Specifications

5SY6663-6 — Identification
ParameterValue
Brand nameSENTRON
Application suitabilityMechanical engineering / industry
5SY6663-6 — Ratings
ParameterValue
Number of poles4
Pole configuration3P+N
Rated current (In), AC63 A
Rated voltage, AC (multi-phase)440 V
Rated voltage, AC (single-phase)440 V
Voltage typeAC
5SY6663-6 — Protection
ParameterValue
Tripping characteristic (trip curve)B
Rated breaking capacity (Icn), per EN 608986 kA
Rated breaking capacity, per IEC 60947-210 kA
Breaking capacity, AC (UL 1077 / CSA C22.2 No.235)5 kA
Energy limitation class3
Overvoltage categoryIII
Pollution degree3
Degree of protection (IP)IP20, with connected conductors
Neutral conductor switchingYes
Touch protectionYes
5SY6663-6 — 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
5SY6663-6 — 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

Product details

Siemens 5SY6663-6 — SENTRON 4-pole MCB, 63 A, B curve

Installation depth is 70 mm. The quick-assembly fastening system and any mounting position simplify panel layout.

Thermal derating and environmental range

Rated 63 A at 35 °C; derates to 59.98 A at 40 °C, 58.4 A at 45 °C, 56.83 A at 50 °C, and 55.12 A at 55 °C. Pollution degree 3, overvoltage category III — standard for fixed industrial installations. Halogen-free and silicon-free construction.

Current production — no end-of-life notice. For BOM freeze or line-down replacement, this is a standard-catalog item with no special lead-time risk.

Frequently asked questions

What is the breaking capacity of 5SY6663-6?

6 kA per EN 60898 and 10 kA per IEC 60947-2. The IEC 60947-2 rating is the one to use for industrial panel SCCR calculations.

What is the width of 5SY6663-6?

72 mm, which is 4 modular width units on a standard DIN rail.

Where can I buy 5SY6663-6?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

MPN
5SY6663-6