Square D HDA36020 - 20 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Square D HDA36020—a 20A, 600V, 3-pole plug-in molded case circuit breaker designed to deliver dependable branch circuit protection right where you need it. Built for quick, clean installations in panelboards and load centers, this unit keeps critical circuits safe from overload and short circuits while simplifying upgrades and replacements.

Why this breaker stands out

• Fast plug-in connection for rapid installation and effortless replacements, reducing downtime during panel upgrades or maintenance.
• Thermal-magnetic trip unit provides stable, repeatable protection—thermal protection handles gradual overloads and magnetic protection responds instantly to short circuits for critical circuit safety.
• OEM-compatible fit designed to pair with matching Square D load centers and panelboards, ensuring reliable coordination and fit without aftermarket guesswork.
• Versatile application suitable for residential panels, commercial distribution, and light industrial setups requiring 3-pole, 600V protection across three phases.
• 3-pole, 20A, 600V capability enables dependable protection for multi-phase circuits while maintaining compatibility with standard panelboard architectures.

What you get with the HDA36020

• Manufacturer: Square D
• Part Number: HDA36020
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 20A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

Choose the HDA36020 when you’re wiring or expanding panelboards in homes, offices, retail spaces, or light industrial environments that require robust 3-phase protection up to 600V. It’s an excellent replacement option for aging breakers in compatible Square D panels, helping you restore or upgrade circuit protection with minimal downtime. The plug-in design makes it particularly well-suited for field upgrades, panel refurbishments, or new installations where fast, reliable connections matter most.

Installation and compatibility tips

• Verify that your panelboard or load center is compatible with Square D plug-in molded case breakers and that the HDA36020 matches the panel’s rating and configuration.
• Use the 3-pole, 20A, 600V specifications for three-phase circuits or three-phase feeders to ensure proper protection and coordination with other protective devices.
• When performing replacements, power down the system and follow all local electrical codes and manufacturer instructions to ensure a safe, code-compliant installation.
• Pair this breaker with matching OEM components to maintain protective coordination and prevent nuisance trips or mis-timed tripping in the distribution system.

Technical at a glance

The Square D HDA36020 is purpose-built for dependable branch circuit overcurrent and short-circuit protection. Its plug-in design, combined with a thermal-magnetic trip unit, delivers predictable performance across a range of operating conditions, helping protect wiring and connected devices while keeping maintenance straightforward in residential, commercial, and light industrial panels.