General Electrics TEY3100ST12 - 100 A, 3-Pole Bolt-On Circuit Breaker | AmpState

The General Electrics TEY3100ST12 is a 100 A, 3-pole bolt-on molded case circuit breaker designed to deliver reliable branch circuit protection in panelboards and load centers. Built for residential, commercial, and light industrial environments, it combines sturdy mechanical design with precise protection to keep electrical systems safe and available.

Why the TEY3100ST12 stands out

• Secure bolt-on mounting: A rigid connection to the bus minimizes movement and vibration-related interruptions, helping maintain consistent protection over time.
• Thermal-magnetic trip unit: Delivers stable, repeatable protection for overcurrent and short-circuit events, helping protect conductors and downstream devices without nuisance trips.
• 3-pole configuration: Ensures synchronized protection across all phases in 3-phase systems, reducing imbalance and simplifying coordination in multi-wire panels.
• OEM compatibility: Designed to pair with matching General Electrics OEM load centers and panelboards for a clean fit and reliable performance.
• Versatile application: Suitable for a range of installations—from new panel builds to upgrades in residential, commercial, and light industrial settings.

Technical snapshot

• Manufacturer: General Electrics
• Part Number: TEY3100ST12
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage Rating: 100 A
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases and practical considerations

For homes with multi-zone electrical loads or small commercial panels distributing power to lighting, outlets, and HVAC, the TEY3100ST12 provides a robust line of defense against fault currents. It’s particularly well-suited for panels that experience mechanical vibration or door-open/close cycles, where a secure bolt-on connection helps maintain long-term integrity.

Choosing this breaker means prioritizing alignment with your existing OEM panelboard ecosystem. When replacing or upgrading, verify that your panel supports a 3-pole, 100 A MCCB with a bolt-on mounting style to preserve proper trip characteristics and system coordination across the protection scheme.

Beyond the breaker itself, consider planning for serviceability: bolt-on designs typically simplify removal and replacement during maintenance, reducing downtime and making future upgrades more straightforward.