Square D HJA36070UPYP 70A 3-Pole 600 V Circuit Breaker Potential Transformer

Meet the Square D HJA36070UPYP 70 A, 3-Pole, 600 V Circuit Breaker Potential Transformer—a robust protection solution built for demanding three-phase power systems. This Square D device combines precise current interruption with the reliability you expect from a legacy electrical protection line, making it a dependable choice for industrial panels, controllers, and heavy machinery feeders.

Designed to guard your most important equipment from overloads, short circuits, and fault events, this 70 A circuit breaker offers clean, predictable tripping across all three phases. The 3-pole configuration ensures synchronized protection, reducing phase imbalance and protecting motors, transformers, and other high-load assets that demand coordinated fault clearing. With a 600 V rating, it’s well-suited for common industrial distribution networks, giving you ample headroom for safety margins and future expansion.

Key specifications at a glance

• Current rating: 70 A
• Poles: 3 (three-phase protection)
• Voltage rating: 600 V
• Brand and model: Square D HJA36070UPYP
• Function: Circuit breaker with potential transformer compatibility for enhanced system monitoring

What sets this unit apart

Unlike generic protection devices, the HJA36070UPYP is purpose-built for Square D panels and compatible distribution gear, offering dependable replacement performance and long-term reliability. The 3-pole configuration delivers true three-phase protection, which is critical for avoiding motor stall, uneven loading, and transformer stress. The potential transformer integration angle provides better visibility into system health, helping you capture accurate measurements and improve protection coordination in larger electrical installations.

Ideal use cases

• Industrial facilities with three-phase motors (conveyors, pumps, compressors) where coordinated phase protection is essential
• Electrical rooms and control panels in manufacturing environments requiring reliable feeder protection
• Data centers or large equipment rooms with demanding load profiles that benefit from solid protection and monitoring readiness
• Replacement parts for legacy Square D installations where panel compatibility and serviceability matter

Why it matters for your operation

Protecting critical loads not only prevents equipment damage but also minimizes unscheduled downtime and extends asset life. The 70 A rating is well-suited for medium-scale feeders and motor circuits, providing a balanced combination of protection and manageability. The 600 V capability accommodates a wide range of industrial distribution schemes, giving you flexibility as your system evolves. Combined with potential transformer considerations, this breaker helps you achieve better fault reporting and monitoring, supporting proactive maintenance and smarter energy management.

Installation and maintenance tips

• Verify panel compatibility with the HJA36070UPYP model before replacement to ensure a proper fit and secure mounting
• Follow standard electrical installations for three-phase breakers, including correct torque settings and bus bar alignment
• Use as part of a coordinated protection scheme—pair with upstream protective devices to maximize fault clearing efficiency
• Schedule routine inspections to confirm the breaker’s trip characteristics and response times are within acceptable tolerances

In short, the Square D HJA36070UPYP 70 A, 3-Pole, 600 V Circuit Breaker Potential Transformer is a purpose-built protection solution for serious three-phase power environments. It delivers reliable interruption, synchronized three-phase protection, and alignment with monitoring-ready configurations—helping you keep critical equipment safe, minimize downtime, and maintain clear visibility into your electrical system.