Overview
The Westinghouse HMCP003A0C is a molded case motor circuit protector designed for industrial motor control and overcurrent protection. This Series C unit features a 3-pole, 3-ampere rating and operates at voltages up to 600VAC or 250VDC, making it suitable for a wide range of commercial and industrial applications where reliable motor protection is critical.
Key Features
- Instantaneous Magnetic Trip: Non-interchangeable magnetic trip unit with instantaneous-only protection (9-30A adjustable range) for fast response to overcurrent conditions
- Three-Pole Configuration: 3-pole design for three-phase motor protection and control
- High Voltage Rating: Rated for 600VAC or 250VDC maximum, supporting industrial and commercial motor circuits
- Molded Case Construction: F-Frame style molded case circuit breaker with 65kA interrupting capacity at 480V
- Non-Aluminum Terminals: Standard non-aluminum line and load side lug terminals for reliable connections
- Motor Protection: Protects motors with full load current (FLA) range of 0.69–2.5A, compatible with NEMA Starter Size 0
Technical Specifications
- Part Number: HMCP003A0C
- Manufacturer: Westinghouse / Eaton Cutler-Hammer
- Series: C
- Type: Motor Circuit Protector (MCP)
- Rated Current: 3 Amperes
- Poles: 3 (Three-Phase)
- Voltage Rating: 600VAC / 250VDC Maximum
- Trip Unit: Magnetic, Non-Interchangeable, Instantaneous-Only
- Trip Range: 9–30 Amperes (adjustable)
- Frame: F-Frame (J-K designation)
- Interrupting Capacity: 65kA @ 480VAC
- Motor FLA Range: 0.69–2.5A (NEMA Starter Size 0)
- Wire Gauge: 60/75°C Copper / Aluminum
- Terminal Style: Non-Aluminum Lugs (Line and Load)
- Modification Code: 6638C14G03 / 6630C87G03
Typical Applications
- Industrial motor control circuits requiring overcurrent protection
- Three-phase motor branch circuit protection in manufacturing plants
- Commercial HVAC and machinery motor circuits
- Replacements in existing 600V industrial control systems
- Motor protection in control panels and MCC (Motor Control Center) installations
Compatibility & Replacements
Compatible With
- Westinghouse Series C motor circuit protector slots and enclosures
- Eaton Cutler-Hammer molded case circuit breaker frames (F-Frame, J-K designation)
- 600VAC three-phase industrial motor circuits up to 3A
- Standard DIN rail and panel mount enclosures for molded case breakers
- Motor control center (MCC) and switchgear assemblies rated for Series C units
Replaces / Drop-In Replacement For
- Westinghouse HMCP Series 3A units (same voltage and pole rating)
- Original equipment manufacturer (OEM) Cutler-Hammer HMCP003A0C units
- Legacy Westinghouse motor circuit protectors with equivalent 3A, 3-pole, 600V ratings
Works With
- Industrial control systems with 600VAC three-phase distribution
- Motor starter circuits and overload protection schemes
- Standard molded case breaker installation procedures and accessories
- Manual motor control and soft-start motor control systems
