Square D KA36125G 125A 3-Pole 600 V Circuit Breaker Potential Transformer

Meet the Square D KA36125G—a rugged, reliable protection and measurement solution designed for demanding electrical environments. This 125 A, 3-pole, 600 V circuit breaker comes with an integrated potential transformer, delivering both overcurrent protection and direct metering-ready capability in a single, space-saving unit.

Key specifications

• Part Number: KA36125G
• Current rating: 125 A
• Poles: 3
• Voltage rating: 600 V
• Special feature: Integrated potential transformer for accurate monitoring and relay input

Why this integrated design matters

Traditional protection schemes often require separate metering transformers to feed relays and meters. The KA36125G simplifies this with an on-board potential transformer, delivering clean, reliable input to protective relays and energy meters without the hassle of extra components. The result is quicker installation, fewer wiring errors, and streamlined diagnostics in both new builds and panel upgrades.

Ideal use cases

• Three-phase power distribution panels in commercial facilities and light industrial plants
• Motor control centers requiring synchronized protection and measurement inputs
• Panels where space, wiring complexity, and reliability are critical
• Systems that benefit from direct metering integration for energy management and demand reporting

What sets it apart

• Integrated potential transformer: Simplifies metering/relay connections, reducing external components and potential wiring errors.
• Three-pole protection for balanced three-phase systems: Ensures coordinated protection across all phases with a compact footprint.
• 600 V rating and 125 A capacity: Well-suited for medium-voltage distribution and feeder protection in many commercial and light industrial applications.
• Brand reliability: Square D equipment is known for consistent performance and long-term serviceability in demanding environments.

Practical tips for implementation

• Verify panel compatibility and mounting requirements with your distribution system to ensure seamless integration of the KA36125G.
• Use the integrated potential transformer to feed compatible metering and protective relays, simplifying wiring layouts and improving measurement accuracy.
• Plan for future expansion: the 3-pole design supports scalable protection for evolving three-phase systems.

For professionals seeking a compact, measurement-ready protection solution, the Square D KA36125G delivers precise protection, straightforward installation, and integrated metering convenience in one dependable package.