Overview
The Siemens HED43B050 is an industrial-grade Sentron molded case circuit breaker designed for low-voltage power distribution systems. This ED frame breaker provides dependable overload and short-circuit protection in switchboards, panelboards, and individual enclosures. Built on decades of Siemens reliability, the HED43B050 combines thermal-magnetic trip protection with a high interrupting capacity rating, making it suitable for demanding industrial applications where consistent uptime is critical.
Key Features
- Thermal-Magnetic Trip Element: Time-delay thermal overload protection combined with instantaneous magnetic short-circuit detection for dual-level protection
- High Interrupting Capacity (42 kA @ 480V): Rated to safely interrupt maximum fault currents without nuisance trips
- ED Frame Design: Compact bolt-on construction with integrated load-side lug terminals; field-installable line-side lugs available
- 3-Pole Configuration: Three-phase feed-thru operation suitable for industrial 480V systems
- Temperature Rating: Rated for continuous operation up to 40°C ambient
Technical Specifications
The HED43B050 meets industry standards for molded case circuit breakers and is compatible with Siemens Sentron power distribution components. Field testing confirms thermal and magnetic trip calibration per standard curves.
Typical Applications
- Industrial machinery and motor control centers
- Large motor feeder protection (up to 50A @ 480V)
- Main distribution switchboards and panelboards
- Legacy I-T-E/Siemens panel retrofits and replacements
- Standby power and emergency backup systems
Compatibility & Replacements
The Siemens HED43B050 is part of the Sentron ED frame family and is compatible with Siemens line-side lugs (catalog LN1E100 for 30–100 A breakers) and compression-type lugs (CCE125). This breaker may be cross-referenced with legacy I-T-E and Gould circuit breaker systems. Used units are fully functional and have been tested for proper trip response. In-stock availability ensures minimal downtime for panel upgrades and emergency replacements.
