Eaton Cutler-Hammer XTOB012BC1 Overload Relay

As a veteran HVACR technician, you know that keeping your motor leads protected is non-negotiable for system uptime. The Eaton Cutler-Hammer XTOB012BC1 Overload Relay is a purpose-built IEC bimetallic overload relay engineered for precise thermal protection in the 9-12 Amp range. This Frame B unit integrates seamlessly with XT series contactors, specifically the XTCE007B through XTCE015B models, to create a compact and reliable motor starter assembly. Featuring Class 10 tripping characteristics, it ensures the circuit is opened in 10 seconds or less during an overcurrent event, effectively shielding your compressor motors and pump motors from phase loss and sustained thermal overload. The direct mount design eliminates the need for additional wiring between the contactor and relay, saving critical enclosure space and reducing potential points of failure. With selectable manual or automatic reset modes and ambient temperature compensation, this relay maintains its trip accuracy across varying mechanical room environments.

Key Benefits for the Contractor

• Optimized Compatibility: Designed for direct attachment to Eaton XT series Frame B contactors (9-15A range), ensuring a rigid and secure electrical connection.
• Enhanced Motor Safety: Trip Class 10 protection with built-in phase loss sensitivity prevents motor burnout during unbalanced load conditions.
• Installation Versatility: Features a selectable auto/manual reset dial and a 1NO-1NC auxiliary contact configuration for flexible control circuit integration.
• Field Diagnostics: Includes a visible trip indicator and a pull-to-test function, allowing for rapid troubleshooting and verification of the control logic.
• Robust Construction: IP20 rated enclosure with screw terminals provides a finger-safe design suitable for stationary machinery and HVACR equipment.

Common Questions

Which Eaton contactors are compatible with the XTOB012BC1?
This Frame B overload relay is designed to mount directly to XTCE contactors up to 15A, including models XTCE007B, XTCE009B, XTCE012B, and XTCE015B.

What is the difference between manual and automatic reset on this unit?
The manual setting requires a technician to physically press the reset button after a trip, which is preferred for diagnosing the cause of the overload, while the automatic setting allows the bimetallic strips to reset once they have cooled sufficiently.

Does this relay provide protection against phase loss?
Yes, the XTOB012BC1 is specifically engineered with phase failure sensitivity to protect three-phase motors if one phase drops out, preventing high-heat damage to the windings.

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.