Square D 999360 Circuit Breaker, 60A, 3-Pole, 600V

Square D 999360 Circuit Breaker is a rugged, industrial-grade overcurrent protection solution designed for demanding service and maintenance environments. Rated at 60 A with three poles and a 600 V maximum, this unit is built to safeguard equipment and personnel while keeping downtime to a minimum.

Compatibility and verification

To ensure a precise fit, verify the part number and your application requirements. The 999360 is part of the On Frame 99 series, a trusted platform for retrofit and replacement projects in industrial panels. Always confirm compatibility by cross-checking the part number 999360 with your panel specifications and intended load profile. If you’re unsure about fit or installation, send us a message and our team will help you confirm compatibility against your equipment and wiring scheme.

Key specifications at a glance

• Part number: 999360
• Series: On Frame 99
• Type: Circuit Breaker
• Amperage: 60 A
• Poles: 3
• Voltage rating: 600 V

What problems this breaker solves

When industrial equipment demands reliable fault interruption, the 999360 delivers. It protects motor lines, power distribution feeders, and control circuits from overloads and short circuits, helping to prevent damage to downstream equipment and reducing unplanned downtime. Because it’s part of the well-established On Frame 99 family, it offers consistent performance and straightforward replacement in compatible enclosures.

Best-fit use cases

• Replacement in On Frame 99 series panels and switchgear
• Industrial service upgrades or retrofits where a 60 A, 3-pole, 600 V protector is required
• Maintenance shutdowns and routine electrical servicing in manufacturing plants, processing facilities, and large workshops

Why this Square D breaker stands out

• Proven compatibility within the On Frame 99 ecosystem—a reliable choice for existing installations designed for this series.
• Clear part-number-driven matching—reduce the guesswork in replacement projects by starting with 999360.
• Industrial-grade protection suited for continuous service environments common in manufacturing and distribution settings.

Installation and best practices

Handle with the power off and follow your facility’s safety protocols. Confirm mounting and bus conformity with the On Frame 99 framework, and ensure the wiring and terminals meet the device’s torque and conductor requirements. For compatibility confirmation or installation questions, message us and we’ll help verify fit against your specific panel and load profile.