Overview
The Heinemann CD3-A3A0A3-DU is a hydraulic-magnetic circuit breaker rated for 30 amperes at 240VAC, engineered for dependable protection in motor control and industrial power distribution applications. Built by Eaton Cutler-Hammer’s Heinemann division, this CD3 series breaker combines thermal and magnetic trip mechanisms to protect against both overload and short-circuit conditions.
Key Features
- Rated 30A continuous current at 240VAC
- Hydraulic-magnetic trip mechanism for precise overcurrent protection
- Compact CD3 form factor suitable for panel mounting
- 50/60 Hz operation across standard industrial frequencies
- Proven reliability in motor control and circuit protection applications
Technical Specifications
Nominal current rating: 30A
Voltage: 240VAC
Frequency: 50/60 Hz
Trip mechanism: Hydraulic-magnetic
Mounting: Bolt-on rail or panel mount (standard Heinemann CD3)
Operating temperature range: -10°C to +55°C (typical)
Poles: 3 (standard CD3 configuration)
Typical Applications
- Industrial motor control circuits
- Heavy-duty machinery protection
- Power distribution panels
- Machine tool circuits
- Emergency backup systems
- OEM equipment retrofit and replacement
Compatibility & Replacements
Compatible With
- Eaton Cutler-Hammer control panels
- Standard industrial electrical enclosures with bolt-on rail mounting
- 230V/240V single or three-phase circuits
- Motor control centers (MCCs) accepting CD3 breaker form factor
- Legacy and modern panel designs using Heinemann breaker bases
Replaces / Drop-In Replacement For
The CD3-Z79-1 variant designation indicates this unit is compatible with systems previously fitted with other Heinemann CD3-A3A0A3 series breakers. Verify compatibility with your system integrator before ordering to confirm interchangeability with your specific control panel or MCC.
Works With
- Eaton / Cutler-Hammer motor starters and soft starts
- Industrial control relays and contactors
- Overload heaters sized for 30A branch circuits
- Standard DIN rail and bolt-on mounting hardware
- Power monitoring and diagnostics systems supporting hydraulic-magnetic breakers
