ABB S5N300TW Molded-Case Circuit Breaker (SACE Isomax Series)

Up your system’s safety and performance with the ABB S5N300TW, a rugged, high-capacity molded-case circuit breaker engineered for demanding industrial environments.

Key Specifications

• Model: S5N300TW

• Manufacturer: ABB (Asea Brown Boveri) 

• Series: SACE Isomax (S5N family) 

• Rated Current: 300 A

• Poles: 3 (three-phase)

• Voltage Rating:

  • 600 VAC

  • Suitable for up to 500 VDC

• Interrupting Capacity: 35 kA @ 480 V AC 

• Trip Mechanism: Thermal-magnetic (LI — Long-Time & Instantaneous) 

• Connection Type: Bolt-On frame—secure installation, ideal for heavy load switching

• Weight: ~10–12 lbs depending on configuration 

Highlights & Applications

• Designed for industrial motor protection, distribution panels, and overload applications where fast, reliable circuit interruption is critical

• Part of ABB’s trusted Isomax line, delivering robust performance and safety compliance

• High interrupting capacity (35 kA) ensures dependable operation under short-circuit conditions

• Thermal-magnetic mechanism offers fast response to both long-term overloads and immediate fault currents

• Bolt-On design simplifies mounting in switchgear and electrical panels