Square D HDA36070SK 70A 3-Pole 600 V Circuit Breaker

Square D HDA36070SK is a 70 A, 3-pole circuit breaker engineered for three-phase electrical protection up to 600 volts. Built for reliable overcurrent interruption, this device is ideal for safeguarding distribution panels and three-phase circuits in industrial and commercial environments. Part number HDA36070SK identifies the exact unit in the Square D line, ensuring straightforward ordering and replacement when you upgrade or expand your panel setup.

Key specifications

• Current rating: 70 A
• Poles: 3
• Voltage rating: 600 V
• Brand/series: Square D (HDA series)
• Part number: HDA36070SK

What this means for your electrical system

For engineers and electricians, the HDA36070SK provides dependable protection for three-phase feeders and equipment loads. Use it to:

• Safeguard motors, compressors, and other three-phase equipment from overloads and short circuits
• Protect distribution circuits in industrial control panels and service enclosures
• Provide a clearly identifiable, replacement-ready component within Square D-compatible panel boards

Ideal use cases

• New panel installations requiring a 70 A three-pole breaker rated for 600 V
• Repairs or upgrades in facilities with existing Square D HDA-series breakers
• Industrial settings where reliable, straightforward protection for three-phase loads is essential

Installation and compatibility

Designed to fit Square D panels that accommodate HDA series breakers, the HDA36070SK integrates into standard 3‑phase distribution systems. When selecting a replacement or upgrade, verify that your panel supports three-pole devices in the 70 A range and that the bus configuration aligns with a 600 V, 3‑phase supply.

Practical tips and best practices

• Inspect the breaker’s mounting and terminations for clean, secure connections during installation.
• Maintain clear labeling around the panel to quickly identify protected circuits and reduce downtime during faults.
• Keep a spare HDA36070SK on hand as part of routine maintenance for fast replacement in critical systems.