Overview
The Siemens HED43B040 is a molded case circuit breaker from the Sentron series, engineered for robust protection in commercial and industrial electrical distribution systems. This 3-pole thermal magnetic molded case circuit breaker carries a 40-amp current rating and 480VAC voltage rating. It features a 42kAIC interrupting rating at 480V, making it suitable for systems with significant fault current potential.
Key Features
- Thermal Magnetic trip unit with Long-Time and Instantaneous trip functions provides protection against overloads and short circuits
- UL 489 compliance meets rigorous circuit breaker standards
- IEC 60947-2 certified for international use
- RoHS compliant, adhering to substance restrictions for environmentally friendly design
- Bolt-on mounting configuration for secure installation
- Equipped with load-side lug terminals for simplified wiring connections
- Suitable for reverse feed applications
Technical Specifications
The HED43B040 delivers consistent performance in demanding industrial environments:
- Frame Type: HED (Type HED4)
- 3-pole, 3-phase configuration rated for 40A at 480V
- Interrupting capacity: 42kA @ 480VAC; 100kA @ 240VAC
- Operating temperature rating: 40°C
- Dimensions: 3.00″ W × 6.4″ H × 3.92″ D
- Wire range: 10–1/0 AWG (copper/aluminum)
- Trip Unit: Non-interchangeable Thermal Magnetic
Typical Applications
The Siemens HED43B040 is well-suited for industrial and commercial applications where high reliability and safety are paramount. Common use cases include:
- Medium-voltage industrial distribution panels and switchboards
- Manufacturing facility main and branch circuits
- Commercial HVAC and motor protection
- Data center and telecommunications infrastructure power distribution
- Utility and backup power system integration
Compatibility & Replacements
The HED43B040 is part of Siemens’ Sentron series of molded case circuit breakers. When sourcing replacements or compatible equipment, ensure voltage, amperage, pole count, and interrupting capacity match application requirements. The non-interchangeable trip unit design prevents unauthorized substitutions that could compromise system safety. For customized circuit protection solutions, consult with your electrical distribution engineer or Siemens representative to verify compatibility with existing enclosures and switchboards.
