Overview
The Siemens HED43B050 is a Type HED4 molded case circuit breaker from the Sentron Series, engineered for low-voltage industrial and commercial panelboards. This 50A breaker operates at 480 VAC/250 VDC, 50/60 Hz, with a 42 kA interrupt capacity, ED frame configuration, thermal/magnetic trip mechanism, 3-pole, 3-phase design, and load lug connection rated for 10 to 1/0 AWG wire. The bolt-on design enables straightforward installation in switchboards and individual enclosures, making it ideal for machinery protection, branch circuits, and feeder applications where high interrupting capacity is required.
Key Features
- High Interrupting Capacity: 42kA at 480V with bolt-on, 3-phase, long-time and instantaneous trip functions
- Thermal-Magnetic Trip: Time delay thermal trip element combined with instantaneous magnetic trip element for complete overload and short circuit protection
- ED Frame Design: Suitable for use in individual enclosures, switchboards, and panelboards, available in thermal magnetic trip types
- Load Lug Terminals: All ED frame breakers are provided with load side lugs; line side lugs may be added in the field if required
- Wire Compatibility: Accepts copper or aluminum conductors from 10 to 1/0 AWG
- Operating Temperature: Rated for 40°C ambient conditions
Technical Specifications
The HED43B050 combines proven thermal-magnetic protection technology with high-current interrupting ratings suitable for three-phase distribution systems.
Typical Applications
- Three-phase motor branch circuits and feeders in manufacturing facilities
- Industrial switchboards and motor control centers
- Commercial panelboards requiring 50A protection at 480V
- Machine tool and heavy equipment protection circuits
- Bulk material handling systems and compressor circuits
Compatibility & Replacements
The HED43B050 is a direct-mount Sentron breaker compatible with ED frame-equipped enclosures. Field-installable accessories include optional line-side lugs (LN1E100 for 30–100A units) and compression lugs (CCE125). When replacing or upgrading, verify your panelboard’s frame size and bolt-on pad configuration. The Siemens HED frame series is widely recognized in industrial automation and controls, making this unit a reliable standard-replacement for legacy I-T-E and Siemens ED-frame breakers in three-phase 480V systems.
