Siemens HDK3T100L 100A 3-Pole 347 V Circuit Breaker Potential Transformer

Introducing the Siemens HDK3T100L, a robust 3-pole circuit breaker designed for 347 V electrical systems with a 100 A current rating. Part of Siemens' trusted protection lineup, this unit delivers reliable overcurrent protection while integrating potential transformer functionality for streamlined monitoring and metering in modern 3-phase panels.

Built for industrial and commercial power distribution, the HDK3T100L guards critical circuits from overloads and short circuits while providing measurement signals that can feed energy meters or protective relays without the need for extra transformers or wiring. This reduces installation complexity and enhances visibility into system health.

• Current rating: 100 A
• Poles: 3
• Voltage rating: 347 V
• Part number: HDK3T100L
• Integrated capability: Potential transformer-enabled design for monitoring and metering across a three-phase circuit

Ideal for facilities with 347 V three-phase distribution—think commercial buildings, data centers, manufacturing floors, and large campuses—where reliable protection and accurate monitoring are essential. The built-in sensing compatibility helps simplify wiring and supports coordinated protection schemes without sacrificing performance.

Practical usage tips: verify that your panel and enclosure support 347 V three-phase operation, ensure trip characteristics align with your protection coordination plan, and pair the HDK3T100L with compatible relays or meters to maximize visibility into load current and voltage health. Regular inspection and testing of the breaker helps maintain uptime and protect valuable equipment.