Eaton Cutler-Hammer C306GN3B Overload Relay

The Eaton Cutler-Hammer C306GN3B Overload Relay is a specialized ambient compensated bimetallic thermal overload relay designed for precise motor protection in rigorous industrial environments. This 3-pole open type enclosure unit is engineered for direct integration with Eaton Freedom Series NEMA Size 1 and NEMA Size 2 contactors, as well as IEC frame sizes G through K. With a 75 amp maximum rating (adjustable range typically 60-75A), it effectively manages thermal fluctuations to prevent motor burnout while avoiding nuisance tripping caused by varying ambient temperatures. As a Series B overload relay, this model features integrated load lugs and is specifically compatible with Series B heater packs. This versatile component supports multiple mounting configurations, including direct attachment to the starter or independent panel mounting using a standalone adapter. Built to rigorous NEMA standards, the C306GN3B ensures reliable phase loss and overcurrent detection for heavy-duty HVACR and motor control applications.

• Ambient Compensation: Maintains consistent trip accuracy in environments with fluctuating temperatures, ensuring the bimetallic thermal overload relay performs reliably.
• Freedom Series Compatibility: Purpose-built for Direct Mounting to NEMA Size 1 and NEMA Size 2 contactors, reducing installation time and footprint.
• Flexible Mounting: Support for both starter-mounted and panel-mounted configurations allows for easier retrofitting in existing control cabinets.
• High Current Capacity: Robust 75 Amp maximum rating handles significant motor loads common in industrial ventilation and refrigeration systems.
• Technical Precision: Three-pole design provides comprehensive protection for three-phase motor circuits.

What heater packs are compatible with the C306GN3B?
This is a Series B relay and requires Series B heater packs; it will not accept older series components. Proper heater selection is critical based on your motor's Full Load Amps (FLA).

Can this relay be used with IEC contactors?
Yes, the Eaton C306GN3B is designed to work with IEC frame sizes G through K in addition to NEMA Size 1 and 2 applications.

Does this unit come with a reset function?
The Freedom Series C306 relays typically feature a manual/automatic reset selector and a visible trip indicator for rapid troubleshooting in the field.

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.