Square D HDL36020SN 20A 3-Pole 690 V Circuit Breaker

Introducing the Square D HDL36020SN 20A 3-Pole 690 V Circuit Breaker — a robust protection device built for demanding industrial and commercial electrical systems. This unit carries the HDL36020SN part number and is designed to guard three-phase circuits against overloads and short circuits in environments up to 690 V.

Key specifications

• Current rating: 20 A
• Poles: 3 (three-pole design for balanced protection across all phases)
• Voltage rating: 690 V
• Part number: HDL36020SN

What this breaker protects

With a 3-pole architecture, this breaker is ideal for protecting three-phase feeders and motor circuits that run on higher voltage. It helps prevent nuisance trips on unbalanced loads and provides coordinated protection for equipment such as pumps, conveyors, compressors, and HVAC systems that operate on 3-phase power.

Where it shines

• Industrial panels and switchgear: Reliable protection in panels designed for 3-phase distribution and controlled motor loads.
• Commercial facilities: Suitable for mid-size installations with three-phase equipment operating up to 690 V.
• Retrofits and replacements: Use this unit as a direct replacement for compatible Square D assemblies requiring HDL36020SN specifications.

Installation and compatibility tips

Before installing, verify that your enclosure, bus, and mounting style are compatible with a 3-pole, 690 V protective device. Ensure wiring terminals are torqued to manufacturer guidelines and that conductors meet the electrical code requirements for high-voltage distribution. This breaker is designed to integrate with Square D systems that specify HDL-series breakers, making installation straightforward for compatible panels.

Why choose Square D

• Brand you can trust: Square D has a long history of delivering dependable protection for critical electrical systems.
• Three-phase protection: The 3-pole design ensures synchronized shutdown across all phases, reducing risk of partial faults.
• High-voltage capability: Rated for circuits up to 690 V, expanding compatibility with modern industrial equipment.

Practical considerations and next steps

When sourcing spares, stocking the HDL36020SN ensures you can quickly replace failed breakers on 3-phase feeders. If your system operates at lower voltages or uses a different pole configuration, explore other HDL-series options with matching current rating and voltage specs to maintain system protection and coordination.