Overview
The Eaton Cutler-Hammer EHD3070 is a Series C molded case circuit breaker engineered for industrial power distribution and motor control applications. This 3-pole breaker combines thermal magnetic trip protection with a compact F-frame design, making it ideal for OEM equipment, panelboards, switchboards, and retrofit installations where space efficiency matters.
Key Features
- Thermal Magnetic Trip Units: Reliable protection against overload and short-circuit faults
- Compact F-Frame Design: Fits standard mounting kits with ED, EHD, FDB, FD, HFD, and FDC breakers
- Dual Voltage Rating: Rated 480VAC (50/60 Hz) and 250VDC for flexible application deployment
- High Interrupting Rating: 18 kA at 240VAC, 14 kA at 480VAC, and 10 kA at 250VDC (UL certified)
- Load Terminal Design: Standard pressure line and load terminals simplify installation
- Shunt Trip Ready: Optional shunt trip and auxiliary switches available for field installation
Technical Specifications
- Manufacturer: Eaton / Cutler-Hammer
- Frame Type: F-Frame (EHD Series)
- Ampere Rating: 70A at 40°C ambient
- Voltage Rating: 480VAC (50/60 Hz) / 250VDC
- Number of Poles: 3 Pole
- Trip Type: Thermal Magnetic
- Interrupting Capacity: 18 kA @ 240VAC; 14 kA @ 480VAC; 10 kA @ 250VDC (UL)
- Mounting: DIN Rail or Panel (bolt-on)
- Dimensions: 4.125″ W × 3.375″ D × 6″ H
- Certifications: UL, CSA, CE
- Applicable Standard: IEC 157-1
- UPC: 786679317174
Typical Applications
The EHD3070 is widely used in:
- Industrial panelboards and distribution switchboards
- Motor control centers and HVAC systems
- Manufacturing equipment and machine tool installations
- OEM control cabinets requiring compact protection devices
- Retrofit and replacement projects for existing Series C installations
Compatibility & Replacements
Compatible With
- Standard F-frame mounting kits and rails
- Industrial panelboards and switchboards rated 480VAC or 250VDC
- Motor control centers (MCC) with Series C compatibility
- Shunt trip devices and auxiliary switches (field installable)
- Equipment designed for IEC 157-1 compliant breakers
Replaces / Drop-In Replacement For
- EHD3070L (long format variant)
- Legacy Westinghouse breakers with identical frame and ratings
- Other Series C 70A 3-pole molded case breakers requiring F-frame compatibility
Works With
- DIN rail and panel mounting hardware
- Standard industrial control systems using 480VAC or 250VDC power
- UL and CSA certified electrical enclosures
- Thermal magnetic protection ecosystems in industrial facilities
