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Siemens 3UA5-800-2U Thermal Overload Relay for Contactor Mounting

Siemens 3UA5-800-2U thermal overload relay, 63-80A, for contactor mounting.

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ManufacturerSiemens

Part number3UA5-800-2U

Type Thermal Delayed Overload Relay

Setting Range 63-80A

Auxiliary Contacts 1NO+1NC

Mounting Onto Contactors

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Adjustable thermal trip setting Direct mounting on contactors Phase failure protection Integrated auxiliary contacts (1NO+1NC) Robust construction Siemens quality assurance

Product description

The Siemens 3UA5-800-2U is a thermal delayed overload relay designed for direct mounting onto Siemens contactors. It offers a setting range of 63 to 80 Amps, providing reliable protection against overcurrents and phase loss for medium to large motors. This unit features one normally open (NO) and one normally closed (NC) auxiliary contact for integration into control and signaling circuits.

This relay is a key component in motor starter assemblies, offering a compact and efficient solution for motor protection in industrial environments. Applications include motor control centers, pumps, fans, and conveyor systems where robust and reliable thermal overload protection is essential.

Stanlo Automation, a veteran-owned supplier, specializes in industrial automation surplus. We offer the Siemens 3UA5-800-2U and a wide range of other components. Partner with Stanlo Automation for dependable parts and expert service to keep your operations running at peak performance.

Technical specifications

Type	Thermal Delayed Overload Relay
Setting Range	63-80A
Auxiliary Contacts	1NO+1NC
Mounting	Onto Contactors
Manufacturer	Siemens

Common applications

Motor starters

Industrial machinery

Pump control

Fan control

Conveyor systems

Manufacturing equipment

Compatible systems

Siemens contactors

Also known as

Siemens 3UA5-800-2U relay 3UA5-800-2U motor starter Siemens 63-80A overload

Replaces / compatible with

Designed as a direct mounting overload relay for Siemens contactors, this part replaces older versions within the 63-80A range. Check Siemens documentation for specific compatible contactor series.

Technical note

Expert tip

For optimal performance, ensure the relay's ambient temperature compensation is set appropriately for the operating environment. Proper mounting ensures heat transfer for accurate tripping.

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Frequently asked questions

What is the purpose of the 1NO+1NC auxiliary contacts on the Siemens 3UA5-800-2U overload relay?

The 1NO (normally open) and 1NC (normally closed) auxiliary contacts on the Siemens 3UA5-800-2U are used for control circuit functions. The NC contact is typically wired in series with the contactor coil to trip the motor, while the NO contact can be used for signaling overloads or faults.