ST11245PG 20A 1P 120V Circuit Breaker, Shunt Trip, NEMA 3R, Fusible | AmpState

Introducing the ST11245PG—a 20 A, 1-pole, 120 V circuit breaker engineered for dependable protection in panelboards, load centers, and electrical distribution systems. With a built-in shunt trip and a NEMA 3R enclosure, this unit is designed to withstand outdoor conditions while delivering precise, remote safety control when you need it most.

Why this design matters in real-world setups

• Shunt Trip: Enables remote tripping for emergency shutdowns or integrated safety sequences, giving you rapid, hands-off control when immediate power-down is required.
• NEMA 3R enclosure: Weather-resistant, dust-tolerant protection ideal for outdoor panels, service entrances, and other exposed installations where reliability is critical.
• 20 A, 1-Pole, 120 V: A compact, straightforward protection profile that suits branch circuits and feeders in residential and commercial distributions.
• Fusible configuration: Designed to align with protection schemes that integrate fuse-type coordination within the same equipment family, offering flexible integration in complex electrical setups.
• Direct part-number match: Simplifies procurement for maintenance teams and panel builders by ensuring compatibility with existing inventories.

Ideal for

• Maintenance teams maintaining spare inventories to minimize downtime during protective-device replacements
• Panel builders who require a precise, direct part-number fit to streamline projects
• Electrical distributors serving outdoor installations that demand reliable, weather-rated protection

What makes the ST11245PG stand out: It combines remote safety control with rugged outdoor readiness in a compact 1P 20A package. The shunt-trip capability integrates seamlessly with control systems for safety interlocks, while the NEMA 3R rating ensures dependable operation in exposed environments. This isn’t a generic breaker—it’s a purpose-built solution for critical protection in outdoor panels and distributed electrical systems.

Practical usage tips

• Verify that your control system supports shunt-trip operation and that wiring specifications meet the coil requirements for reliable remote signaling.
• Install in a compliant outdoor-rated enclosure and follow standard wiring practices for single-pole 120 V protection.
• Maintain an on-hand spare ST11245PG to accelerate field replacements and reduce downtime on critical circuits.

Need help confirming fit for your panel or distribution setup? AmpState can assist in validating compatibility against your part numbers and application requirements.