OVERVIEW

Official designation: Fuji SA53C (SA Series, Molded Case Circuit Breaker)

Role/Application: A three-pole MCCB engineered for general line protection, featuring a 30 A rated current and thermal magnetic tripping for reliable overcurrent protection in industrial systems.

KEY SPECS SUMMARY

Power: 690 V AC / 250 V DC

Interfaces / Ports: Screw type terminals

Indicators: Mechanical trip position flag

Operating Temp: Minus 20 to plus 60 degrees C

Platform / Compatibility: Fixed panel mounting

Limit: Interrupting capacity 10 kA (Icu) at 230 V AC

Lifecycle: Discontinued (Replacement: BW50SAG-3P030)

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What are the ultimate and service short-circuit breaking capacities (Icu/Ics) at 440 V AC?

A: The capacities (Icu/Ics) are 5 kA / 3 kA at 440 V AC for the standard SA53C model.

Wiring & Installation:

Q: Is the SA53C breaker designed for use with a specific mounting method in panels?

A: The SA53C is primarily designed for fixed front mounting via screws, with available terminal covers.

Troubleshooting & Compatibility:

Q: What external accessories are compatible with the SA53C for enhanced functionality?

A: Accessories such as auxiliary switches, alarm switches, and shunt trip devices are field-installable.

Replacement & Upgrades:

Q: What is the modern direct replacement series for the discontinued SA53C/30 unit?

A: The recommended direct successor series is the Fuji Electric BW50SAG-3P, specifically the BW50SAG-3P030 model.