Heinemann CD3-A3-DU 7.5A 3-Pole 120/240VAC Circuit Breaker TD1 Special Purpose

Heinemann CD3-A3-DU 7.5A 3-Pole 120/240VAC Circuit Breaker TD1 Special Purpose

The Heinemann Electric CD3-A3-DU is a 3-pole molded case circuit breaker rated at 7.5 amps and 120/240VAC. It carries a TD1 (time-delay) trip designation and is labeled for special purpose use — not intended for general-purpose panel applications. Heinemann Electric was a long-established U.S. manufacturer of precision circuit protection components widely used in industrial, military, and commercial equipment.

Specifications & What's Included

• Manufacturer: Heinemann Electric Co.
• Catalog / Model Number: CD3-A3-DU
• Current Rating: 7.5A
• Number of Poles: 3-Pole
• Voltage Rating: 120/240VAC
• Trip Designation: TD1 (time-delay trip)
• Application Class: Special Purpose — Not for General Use (as labeled on unit)
• Construction: Molded case, three-pole toggle actuator
• Included: Circuit breaker unit only

Applications

The Heinemann CD3 series of molded case circuit breakers was designed for special-purpose overcurrent protection in industrial control panels, military equipment, commercial instrumentation, and OEM machinery — applications requiring precise trip characteristics not found in standard residential or general-purpose breakers. The TD1 trip class provides a defined time-delay response, making this type of breaker well-suited for motor branch circuits or load circuits where nuisance tripping on inrush current must be avoided. These breakers are commonly sought by facilities maintaining legacy industrial equipment, control panel rebuilders, and OEM service technicians needing exact replacement components.