Thermal overload relay · 40-57 adjustable range Class 10A direct mount 1NO-1NC Eaton ECX09K5BA· QS29
What this product is for
This thermal overload relay is used to protect three-phase motors from sustained overcurrent conditions that can overheat windings and shorten motor life. It is typically mounted directly to a compatible Eaton contactor in a motor starter assembly.
Use for
Use for motor starters where the motor full-load current falls within the adjustable 40-57 A range. Suitable for industrial machinery, pumps, fans, compressors, and other motor loads that require thermal overload protection with a Class 10A trip characteristic.
Avoid for
Avoid using this relay where the motor full-load current is outside the 40-57 A adjustment range, where electronic motor protection features are required, or where the relay is not matched to the correct Eaton contactor frame. Do not select by horsepower alone.
Best for
Best for electricians and panel builders replacing or assembling Eaton IEC motor starters that need an adjustable bimetallic overload relay with direct mounting and built-in auxiliary indication contacts.
Installed in
Installed in industrial control panels, motor control centres, OEM equipment, and machinery starter assemblies. Typical ambient rating references for similar relays are -25 to 50 deg C (-13 to 122 deg F), but confirm the exact project conditions and enclosure design before installation.
Why this product exists
Motors can draw damaging current when overloaded or when mechanical conditions change. This relay provides adjustable thermal protection matched to the motor current range, helping reduce nuisance failures and motor damage when properly coordinated with the starter and application.
Compared with similar products
Compared with electronic overload relays, a bimetallic thermal relay is a simpler choice for standard motor starter applications. It is commonly selected when basic overload protection is needed without added communications or advanced diagnostics. As typical trade guidance, set the overload to the motor nameplate full-load current and confirm local code and manufacturer instructions. Actual performance depends on motor design, ambient conditions, and installation details.
Specifications
- Product type: Thermal overload relay
- Brand: Eaton
- Manufacturer part number: ECX09K5BAA-QS29
- Adjustable overload range: 40-57 A
- Trip class: Class 10A
- Auxiliary contacts: 1NO-1NC
- Mounting: Direct mount
- Frame size: 55 mm (approximately 2.2 in)
- Typical terminal wire range on similar listings: 14-2 AWG
- Typical application: IEC motor starter assemblies
- ApplicationIEC motor starter assemblies
- MountingDirect mount
- Frame Size55 mm (approximately 2.2 in)
- Auxiliary Contacts1NO-1NC
- Trip ClassClass 10A
- Adjustable Overload Range40-57 A
- BrandsEaton
- Stock in Elmira2
- Stock in Flesherton1
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