Square D | 999320 | Circuit Breaker | 20A | 3-Pole | 600V | 10kA | Bolt-On

Overview
Meet the Square D 999320 Circuit Breaker—a purpose-built protection device engineered for maintenance, retrofit, and replacement projects where precise specifications matter. This bolt-on, 3-pole unit is rated for 20 amps and 600 volts, with a robust 10kA interrupting capacity to handle demanding fault currents in commercial and industrial panels.

What makes this breaker stand out
- Precisely matched 20A, 3-Pole, 600V specifications with a 10kA interrupt rating ensure reliable protection in higher-load panels.
- Bolt-On mounting provides secure, durable attachment in compatible enclosures, enabling straightforward swaps during upgrades or repairs.
- Proven Square D reliability and compatibility, designed to slot into systems that require exact part numbers for safe operation.

Ideal use cases
- Maintenance and servicing in commercial or industrial electrical rooms where the panel requires a like-for-like replacement.
- Retrofit projects that upgrade panel protection without changing the existing bus or enclosure footprint.
- Replacement tasks where panel compatibility hinges on matching amperage, voltage, pole count, and interruption rating.

Key specifications
• Amperage: 20 A
• Poles: 3-Pole
• Voltage: 600 V
• Interrupting capacity: 10 kA
• Mounting: Bolt-On
• Part reference: 999320

Compatibility and installation tips
Before ordering, confirm fit and ratings for your specific panel. The 999320 part number is the best reference to ensure compatibility with your enclosure and existing wiring configuration. When installing, ensure the panel is de-energized and follow all local electrical codes and safety practices. This breaker is intended for use in systems that require a bolt-on, three-pole, 600V protection device with a 20A rating and 10kA interrupt capability.