Eaton NDC312T35W - 1200 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Eaton NDC312T35W is a high-capacity, bolt-on molded case circuit breaker designed to protect large-panel electrical distributions with confidence. Rated at 1200A and 600V, this 3-pole device delivers dependable branch circuit overcurrent and short-circuit protection for panelboards and load centers in demanding commercial, residential, and light industrial environments.

What makes this breaker stand out

• Secure bolt-on mounting—provides a rigid, vibration‑resistant bus connection that helps maintain consistent electrical contact and reduces the risk of connection-related trips in cabinets subject to movement or vibration.
• Thermal-magnetic trip unit—combines heat-based overload protection with instantaneous magnetic trip for short circuits, delivering stable, repeatable protection performance across a range of operating conditions.
• OEM-compatible design—engineered to fit and coordinate with matching Eaton load centers and panelboards, simplifying installation and ensuring proper protection coverage without compatibility gaps.
• High-current, three-pole configuration—well suited for 3-phase feeders and large distribution circuits, making it ideal for commercial and light-industrial panel assemblies as a main or feeder breaker.

Technical snapshot

• Manufacturer: Eaton
• Part Number: NDC312T35W
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 1200A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

Use the Eaton NDC312T35W to protect large feeders and essential branch circuits in commercial buildings, data halls, schools, hospitals, and light industrial facilities. It excels in situations where high-current distribution, reliable short-circuit interruption, and robust mechanical mounting are priorities—especially in panelboards and load centers that experience vibration or movement.

Why it matters for your electrical protection

In a distribution panel, a single 1200A, 600V, 3-pole breaker like the NDC312T35W can eliminate the need for multiple smaller devices on high-current feeders. The bolt-on design minimizes connection risk, while the thermal-magnetic trip unit provides predictable protection, helping prevent equipment damage, downtime, and costly service calls caused by intermittent faults or loose connections.

Installation and compatibility guidance

Choose the NDC312T35W when you need a breaker that harmonizes with Eaton’s OEM panelboard and loadcenter ecosystems. Ensure the panelboard is designed to accept bolt-on molded case circuit breakers of this rating and configuration, and follow standard electrical installation practices for secure mounting and wiring. For ongoing reliability, inspect connections and verify that the breaker remains within its operating temperature range and that the bus connections stay clean and tight over time.

Practical tips and insights

• Plan ahead when refurbishing or expanding a panel—the 1200A rating positions this breaker as a primary protection device for high-load feeders.
• Use in environments where vibration or equipment movement is a concern to maximize connection integrity and prevent nuisance trips.
• Coordinate with compatible Eaton load centers to maintain proper protection grading and trip response across the distribution system.