Eaton Cutler-Hammer C306DN3B Overload Relay

The Eaton Cutler-Hammer C306DN3B is a heavy-duty bimetallic thermal overload relay engineered for precise motor protection within NEMA Size 00 and NEMA Size 0 starters. Operating with a 32 Amp maximum rating, this 3-pole, open-type unit utilizes ambient compensation to maintain accurate trip settings regardless of local temperature fluctuations around the enclosure. Designed for direct mounting to Freedom Series contactors, the C306DN3B provides reliable overload protection by monitoring current across all phases, ensuring the motor is de-energized before insulation damage occurs. Technicians value the manual/automatic reset capability and the visible trip indicator, which simplifies troubleshooting in industrial motor control applications. This Freedom Series overload is essential for maintaining system uptime in HVACR mechanical rooms where voltage stability and thermal management are critical for phase loss protection and long-term equipment reliability.

• Direct Integration: Plugs directly into NEMA Size 0 and 00 contactors, reducing footprint and wiring complexity in the control cabinet.
• Ambient Compensation: Reliable performance in varying environments, preventing nuisance tripping in high-temperature mechanical rooms.
• Adjustable Settings: Allows for fine-tuning based on the specific FLA (Full Load Amps) of the motor for tighter protection curves.
• Phase Loss Sensitivity: Helps prevent motor burnout by responding quickly to unbalanced loads or single-phasing conditions.

What heater packs are compatible with the C306DN3B?
This relay requires H2001B through H2017B series heater packs (sold separately) to set the specific amperage range for your motor's Full Load Current.

Can this relay be used with non-Eaton contactors?
The C306DN3B is specifically designed for Eaton Freedom Series mounting. For standalone DIN rail or panel mounting, a separate terminal block adapter must be utilized.

Does this unit support automatic reset?
Yes, the C306 series features a field-selectable reset operation that can be toggled between manual and automatic reset modes depending on the safety requirements of your specific application.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.