Siemens | HHJD63B400L | Circuit Breaker | 400A | 3-Pole | 600V

Meet the reliable Siemens HHJD63B400L circuit breaker — a rugged, purpose-built protection device designed for demanding three‑phase power systems. With a 400 A rating, 3‑pole configuration, and a 600 V operating voltage, this unit is engineered to safeguard industrial panels and commercial installations where precise, match‑to‑spec compatibility matters most.

Key specifications at a glance

• Amperage: 400 A
• Poles: 3‑pole (three‑phase)
• Voltage rating: 600 V
• Part number: HHJD63B400L

Why this specific Siemens breaker stands out

• Exact compatibility reference: The part number HHJD63B400L is your most trustworthy anchor for seamless replacement or retrofit — ensuring the new breaker fits the existing panel architecture and electrical loop without guesswork.
• Strategic fit for upgrades and replacements: When your system is a 600 V, three‑phase setup, this unit provides the precise protection you need to maintain performance, safety, and reliability during maintenance or modernization projects.
• Industrial-grade reliability: Built by Siemens, this breaker is designed to withstand the rigors of continuous operation in environments where uptime and safety are non‑negotiable.

Practical use cases and installation notes

• Maintenance in existing industrial control panels that operate on 600 V three‑phase power, where a direct 400 A, 3‑pole replacement is required.
• Retrofit projects aimed at upgrading protection capacity or aligning with updated electrical standards while preserving panel compatibility.
• Replacement of a failed or outdated unit in Siemens‑installed equipment, ensuring consistent performance with the original design.

How to ensure a precise fit before you order

• Verify that your panel or equipment label indicates 600 V and 400 A within a three‑pole configuration to match the HHJD63B400L specs.
• Cross‑check the exact part number — HHJD63B400L — as the most reliable reference for compatibility and safe operation.

Note: Always confirm fit and ratings prior to purchase. Using the correct part number and configuration helps maintain electrical safety, system reliability, and uninterrupted operation across your three‑phase network.