Miniature circuit breaker, type D, 3-pole, 70mm, 400V, 10kA, 63A Part number 5SY4363-8

Product Overview

The Siemens 5SY4363-8 is a SENTRON miniature circuit breaker designed for three-phase applications. It is a 3-pole device rated at 63 A with a D-characteristic trip curve, suitable for protecting circuits with high inrush currents such as motors or transformers.

Key Features

• 3-pole miniature circuit breaker for three-phase systems
• Rated current: 63 A
• Tripping characteristic: Curve D (suitable for high inrush loads)
• Rated operational voltage 400 V AC
• Breaking capacity: 10 kA (EN 60898) / up to 15 kA (IEC 60947-2)
• Installation width: 3 modular width units
• Compact depth ~70 mm for DIN-rail mounting
• Halogen-free and silicon-free construction

Technical Specifications

• Article Number: 5SY4363-8
• Number of Poles: 3 (3P)
• Rated Current (Ie): 63 A at 400 V AC
• Tripping Characteristic: Curve D
• Insulation Voltage (Ui): 440 V AC (single-phase or multi-phase)
• Rated Breaking Capacity (Icn): 10 kA (EN 60898) / 15 kA (IEC 60947-2)
• Depth (installation): approx. 70 mm
• Width: 54 mm (3-module unit)
• Connectable Conductor Cross‐Section: solid up to 35 mm²; finely stranded up to 25 mm²
• Ambient Operating Temperature: –40 °C to +70 °C
• Protection Class: IP20 with connected conductors
• Weight: approx. 484 g

Compliance & Certifications

• Complies with IEC / EN 60947-2 and EN 60898 standards for circuit breakers
• Suitable for industrial and infrastructure use with high inrush current protection
• Designed according to Siemens SENTRON product quality standards

Applications

The 5SY4363-8 is ideal for protecting three-phase motor feeders, transformer circuits, or other industrial loads with high startup current demands, in control panels, switchboards and machine installations requiring reliable overload and short-circuit protection in a compact DIN-rail mounted format.