OVERVIEW

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

Role/Application: A three-pole MCCB providing essential thermal magnetic protection against overcurrent and short circuits in industrial 20 A branch circuits, ensuring stable electrical safety.

KEY SPECS SUMMARY

Power: 690 V AC / 250 V DC

Interfaces / Ports: Screw terminals for conductors

Indicators: Mechanical trip flag indicator

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-3P020)

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What are the rated ultimate short-circuit breaking capacity (Icu) values for the SA53C at 440 V AC?

A: The ultimate short-circuit breaking capacity (Icu) is 7.5 kA at 440 V AC for the standard model.

Wiring & Installation:

Q: What are the primary connection components and mounting type of the SA53C breaker?

A: It utilizes screw terminals for connection and is designed for fixed front panel mounting installation.

Troubleshooting & Compatibility:

Q: How can a technician determine the trip status of the SA53C without external indication?

A: The breaker incorporates a mechanical trip flag that provides local visual status of a trip condition.

Replacement & Upgrades:

Q: What is the recommended modern replacement model for the discontinued Fuji SA53C 20 A unit?

A: The general replacement is the Fuji Electric BW50SAG-3P series, specifically the BW50SAG-3P020 model.