Siemens QS2125HH 125A 2-Pole 240 V Circuit Breaker Potential Transformer

Meet the Siemens QS2125HH 125A 2-Pole 240 V Circuit Breaker—a dependable protection solution for commercial and industrial electrical panels. With a 125-amp rating across two poles, this breaker safeguards 240-volt circuits from overloads and short circuits while delivering a compact, replaceable module that fits neatly into Siemens panel workloads.

• Current rating: 125 A
• Poles: 2-pole configuration for 240 V circuits
• Voltage rating: 240 V
• Part number: QS2125HH

Why this breaker stands out

Designed for seamless compatibility with Siemens panels, the QS2125HH delivers consistent trip characteristics and reliable protection for dual-leg feeds. The two-pole design helps ensure balanced protection for motors, feeders, and other 240 V loads, reducing nuisance trips on single-leg faults and supporting coordinated protection across your electrical system. Its thermal-magnetic trip mechanism responds to overloads and faults, helping minimize damage to conductors and connected equipment.

Practical use cases

• Protect feeders to 240 V equipment in commercial spaces—HVAC units, pumps, compressors, and large lighting circuits.
• Main or sub-feed protection in distribution panels, including retrofit projects where a Siemens QS-series breaker is required.
• Spare or replacement part for ongoing maintenance of existing Siemens installations, ensuring reliability and quick restoration after faults.

Installation and compatibility tips

For optimal performance, pair this breaker with compatible Siemens panels and QS-series accessories designed for modular protection. Always verify that your panel supports a 2-pole, 125 A 240 V device and that labeling matches this configuration. If your protective schemes include metering or monitoring that relies on potential transformer circuits, this breaker can integrate into protection setups that require accurate measurement and safe control, helping you maintain both protection and visibility in your electrical system.