Siemens 5SY4163-8 63A 1-Pole 400 V Circuit Breaker Potential Transformer

Meet the Siemens 5SY4163-8, a durable circuit breaker engineered to protect your electrical installations with trustworthy precision. With a 63 A current rating, a single-pole design, and a 400 V rating, this device is built to perform reliably in modern distribution setups where safety and uninterrupted power matter.

Built to integrate seamlessly into Siemens panel boards and distribution systems, the 5SY4163-8 delivers dependable overcurrent protection for single-phase circuits. Its robust construction and proven Siemens engineering mean you get consistent performance, minimal nuisance trips, and straightforward maintenance—essential for both new builds and thoughtful retrofits.

• Part Number: 5SY4163-8
• Current rating: 63 A
• Poles: 1 (single-pole design for single-phase circuits)
• Voltage rating: 400 V

Who benefits from this breaker? electricians, facilities managers, and system integrators who need reliable, easy-to-specify protection for 400 V electrical networks. It’s an ideal choice for commercial or light-industrial panels where you require solid branch-circuit protection without compromising space or compatibility with established Siemens systems.

Key benefits and outcomes you can expect:

• Reliable overcurrent protection that helps prevent damage to wiring, motors, and connected equipment
• Clear, deterministic performance aligned with Siemens’ long-standing reputation for quality and compatibility
• Effortless replacement in existing Siemens installations, reducing downtime during service or upgrades
• Compact, space-efficient single-pole configuration suitable for dense panel layouts

Practical use cases you’ll appreciate:

• Protect single-phase circuits in 400 V distribution panels for offices, retail spaces, or light industrial facilities
• Replace worn or outdated breakers in Siemens 5SY-based installations to restore reliable protection
• In new projects, specify the 5SY4163-8 when a 63 A, 1-pole solution is required for safe and compliant operation

Why this Siemens breaker stands out from generic equivalents: it carries the Siemens engineering heritage, ensuring consistent trip characteristics, predictable behavior, and compatibility with a broad range of Siemens electrical infrastructure. For project teams aiming to minimize compatibility concerns and maintenance surprises, the 5SY4163-8 offers a straightforward, well-supported protection option that aligns with standard Siemens panels and accessories.

Installation and maintenance notes (practical tips):

• Verify part number and ratings (5SY4163-8, 63 A, 1 pole, 400 V) before installation
• Follow local electrical codes and manufacturer guidelines during replacement or commissioning
• Schedule periodic inspections as part of routine panel maintenance to ensure continued reliable performance
• Keep the breaker within its specified voltage and current limits to avoid premature wear or nuisance trips

In short, the Siemens 5SY4163-8 63A 1-Pole 400 V Circuit Breaker is a dependable, purpose-built protection device for single-phase 400 V networks. It combines Siemens reliability with practical, installer-friendly features, making it a smart, long-term choice for safeguarding electrical systems.