Thermal overload relays, For contactor mounting - Class 10 - Screw Terminals - 3MU7110-0DA0

Product Description

Siemens 3MU7110-0DA0 Thermal Overload Relay – Class 10 Protection for Small Motors

The Siemens 3MU7110-0DA0 Thermal Overload Relay is a compact and reliable motor protection device from the SINOVA 3MU7 Series, specifically designed to protect low-power three-phase motors against overload and phase-failure conditions. With an adjustable current setting range of 0.4A to 0.63A and a Class 10 tripping characteristic, this thermal overload relay delivers dependable motor protection for industrial automation systems, control panels, machine tools, pumps, fans, and other light-duty motor applications. It is designed for direct mounting on Siemens 3MT7 contactors (Size 0, 1, and 2), creating a compact and efficient motor starter assembly.

The relay utilizes a proven thermal bimetal operating mechanism that continuously monitors motor current and simulates actual motor heating conditions. When overload conditions occur, the relay trips before excessive heat can damage motor windings or insulation. This inverse-time protection characteristic helps maximize motor life, reduce downtime, and improve overall system reliability.

Featuring a Class 10 trip characteristic, the 3MU7110-0DA0 is ideal for motors operating under normal starting conditions. It allows standard motor starting currents while providing fast response to sustained overload conditions. This makes the relay suitable for small motors used in conveyors, packaging equipment, HVAC systems, machine-building applications, and industrial automation equipment.

The adjustable 0.4A to 0.63A current range allows precise matching of protection settings to the motor's full-load current. The relay has a rated operational current of 0.63A, ensuring accurate protection for sensitive low-current motor applications.

A key safety feature of the Siemens 3MU7110-0DA0 Thermal Overload Relay is its integrated phase-failure sensitivity. In the event of a phase loss, the relay accelerates tripping to minimize motor heating and prevent costly winding damage. This protection significantly enhances operational safety and motor reliability in industrial environments.

Designed for seamless integration with Siemens 3MT7 contactors, the relay features robust screw terminal connections for both the main and auxiliary circuits. These terminals provide secure wiring, simplified installation, and long-term reliability under industrial operating conditions. The relay also supports both manual and automatic reset functions, allowing users to select the most suitable reset mode according to operational requirements.

The relay includes 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contacts for overload trip indication, alarm signaling, PLC interfacing, and motor starter control circuits. These auxiliary contacts improve system monitoring and simplify control panel integration.

Built according to IEC 60947-4-1 standards, the 3MU7110-0DA0 offers dependable performance, compact dimensions, and Siemens quality assurance. It is widely used in manufacturing plants, water treatment systems, HVAC installations, OEM machinery, and industrial automation projects requiring reliable motor protection.