General Electrics TEY390ST12 - 90 A, 3-Pole Bolt-On Circuit Breaker | AmpState

Power your electrical systems with confidence using the General Electric TEY390ST12 90A, 3-pole bolt-on molded case circuit breaker. Built for dependable branch circuit protection in panelboards and load centers, this unit delivers precise, repeatable performance when protection matters most—from everyday residential setups to demanding commercial and light industrial environments.

Why TEY390ST12 stands out

• Secure bolt-on mounting ensures a rigid, vibration-resistant bus connection, reducing looseness and fostering consistent electrical continuity in panels subjected to movement or vibration.
• Thermal-magnetic trip unit provides stable, repeatable overcurrent and short-circuit protection, reacting quickly to dangerous fault conditions while minimizing nuisance trips in normal operation.
• OEM-load center compatibility designed to fit and work seamlessly with matching General Electric load centers and panelboards, simplifying retrofits and new installations alike.
• Versatile application ideal for residential, commercial, and light industrial applications that require reliable protection for critical branch circuits.

Real-world use cases

Whether upgrading an aging panel or designing a new electrical distribution system, the TEY390ST12 is built to protect essential circuits against overcurrent and short circuits. Use it in service panels that experience vibration or daily panel movements, where a sturdy bolt-on connection helps maintain secure electrical contact over time. Its 90A rating makes it well-suited for mid-range branch circuits, balancing protection with capacity for typical loads found in homes, small offices, and light industrial spaces.

Technical snapshot

• Manufacturer: General Electrics
• Part Number: TEY390ST12
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 90A
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Who benefits most

Electrical technicians, facilities managers, and contractors seeking a durable, factory-tested solution for panelboard upgrades or new builds will appreciate the TEY390ST12. Its bolt-on design reduces connection vulnerabilities in demanding environments, while its thermal-magnetic trip mechanism delivers dependable protection without complicated setup or calibration.

Practical tips for use

• Consult your panelboard’s documentation to confirm bolt torque specifications for secure mounting.
• Pair with GE-compatible OEM load centers to ensure optimal fit and performance.
• Use in circuits where a robust 3-pole protection solution is required to guard multi-phase loads and associated equipment.