Overview
The Siemens HED43B050 is an ED frame molded case circuit breaker from Siemens’ Sentron series designed for industrial electrical distribution applications. Rated at 50 amperes, 480 VAC (250 VDC capable), this 3-pole breaker delivers a 42 kA interrupting capacity at rated voltage, making it suitable for medium-duty power circuits in control panels, switchboards, and industrial enclosures. The breaker features dual thermal and magnetic trip protection for comprehensive fault coverage.
Key Features
- Type HED4 ED frame design for panelboard, switchboard, and individual enclosure mounting
- Thermal-magnetic trip mechanism provides overload and instantaneous short-circuit protection
- 50/60 Hz dual-frequency operation supports both US and international installations
- Load-side lug terminals (10 to 1/0 AWG) for reliable wire connection; line-side lugs available separately
- 42 kA interrupt rating at 480V ensures safe fault current handling
- Rated for 40°C ambient temperature operation in industrial environments
Technical Specifications
Verify full compatibility with your application’s voltage, frequency, and wire gauge requirements.
Typical Applications
The HED43B050 is commonly used in:
- Industrial motor control centers and power distribution panels
- HVAC and facility power circuits (480V three-phase)
- OEM equipment and custom control enclosures
- Retrofit projects replacing legacy molded case breakers in ED frame panelboards
- Process automation systems requiring medium-capacity branch protection
Compatibility & Replacements
The HED43B050 is a bolt-on breaker designed for ED frame panelboards. Siemens also offers the HED43B050L variant (with line and load lugs) for applications requiring both connection types. When replacing an existing breaker, confirm your panelboard accepts ED frame devices and verify the wire gauge range. Reverse connections are permitted on all ED frame breakers. If line-side lugs are needed in the field, part LN1E100 is the catalog number for 30–100 amp breakers. Always consult the panelboard manufacturer’s instructions before installation.
