Thermal overload relays, For contactor mounting - Class 10 - Screw Terminals - 3MU7110-0QA0

Product Description

Siemens 3MU7110-0QA0 Thermal Overload Relay – Class 10 Reliable Motor Protection

The Siemens 3MU7110-0QA0 Thermal Overload Relay is a high-quality motor protection device designed to protect three-phase motors from overload and phase failure conditions. Part of the reliable SINOVA 3MU7 Series, this thermal overload relay provides accurate inverse-time delayed protection to prevent motor overheating and insulation damage caused by prolonged overcurrent conditions. Featuring a 17A to 25A adjustable current range and Class 10 tripping characteristic, the relay is ideal for industrial motor control and automation applications.

The relay is specifically designed for direct mounting on Siemens 3MT7 contactors (Size 1 and Size 2), creating a compact and efficient motor starter assembly. Its space-saving design simplifies panel construction while ensuring dependable motor protection in industrial environments.

With a Class 10 trip characteristic, the 3MU7110-0QA0 provides rapid response to overload conditions while allowing normal motor startup currents to pass without nuisance tripping. This makes it suitable for motors operating under normal starting conditions in applications such as pumps, fans, compressors, conveyors, HVAC systems, packaging machinery, and manufacturing equipment.

The relay offers an adjustable current setting range of 17A to 25A, allowing users to precisely match protection settings to motor full-load current requirements. Accurate current adjustment ensures optimal motor protection while maximizing operational reliability and equipment life.

A key advantage of the Siemens 3MU7110-0QA0 Thermal Overload Relay is its integrated phase failure protection. In the event of a phase loss, the relay accelerates tripping to minimize motor heating and prevent costly winding damage. This feature significantly improves motor safety and reliability in industrial applications.

The relay incorporates robust screw terminal connections for both the main and auxiliary circuits, ensuring secure electrical connections and long-term operational stability. It includes 1 Normally Closed (NC) auxiliary contact for contactor disconnection and 1 Normally Open (NO) auxiliary contact for overload trip indication and signaling.

For operational flexibility, the 3MU7110-0QA0 supports both manual and automatic reset functions. Users can easily select the desired reset mode depending on application requirements, helping balance safety and system availability.

The relay provides temperature compensation across an ambient temperature range of -5°C to +55°C, ensuring accurate protection performance under varying environmental conditions. Built according to international motor protection standards, it delivers reliable operation in demanding industrial environments.

Suitable for manufacturing facilities, process industries, water treatment plants, material handling systems, HVAC installations, and automation projects, the Siemens 3MU7110-0QA0 Thermal Overload Relay offers dependable protection and long-term reliability for critical motor-driven equipment.