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Overload relay
Motor protection circuit-breaker
Motor protection circuit-breakers, also known as motor protective switches or manual motor starters (MMS), are specialized electromechanical devices designed to safeguard electric motors against overloads, short circuits, and phase failures. These devices combine a thermal overload relay and a magnetic short-circuit release in a single compact h...
Motor protection circuit-breakers, also known as motor protective switches or manual motor starters (MMS), are specialized electromechanical devices designed to safeguard electric motors against overloads, short circuits, and phase failures. These devices combine a thermal overload relay and a magnetic short-circuit release in a single compact housing, typically rated for currents from 0.1 A to 100 A and voltages up to 690 V AC. They feature adjustable thermal trip settings to match motor full-load current (FLC) and instantaneous magnetic trips for short-circuit protection, with breaking capacities up to 100 kA depending on the model. Common configurations include 3-pole (3P) units for three-phase motors, with optional auxiliary contacts, shunt trips, and undervoltage releases for remote signaling and control. They are designed for DIN-rail mounting in control panels and are available with screw or spring-cage terminals for secure wiring.
Motor protection circuit-breakers are primarily used in industrial automation, HVAC systems, pumping stations, conveyor systems, and machine tools to protect motors from damage due to overloads, locked rotors, or phase imbalance. They are installed in motor control centers (MCCs), distribution boards, and direct-on-line (DOL) starter circuits. These devices are critical in applications requiring reliable motor protection, such as compressors, fans, crushers, and elevators, where downtime can be costly. They also serve in commercial buildings for air handling units and refrigeration systems, ensuring compliance with electrical safety standards like IEC 60947-4-1.
Key subcategories include fixed and adjustable thermal trip models, with article codes often structured as series prefix (e.g., "MS" for manual starters) followed by current rating and pole count, such as MS-32-3P for a 32 A three-pole unit. Popular series include the Siemens 3RV2, Eaton Moeller PKZM0, and Schneider GV2ME, with codes like GV2ME16 (16 A) or PKZM0-25 (25 A). These are available in frame sizes from 0 to 4, covering motor ratings from 0.1 kW to 55 kW. Accessories like phase failure relays and remote reset modules are also common.
At Electric Automation Network, we offer express worldwide shipping and personalized technical support from our team of electrical engineers. We provide real-time pricing, detailed technical documentation for each article, and expert guidance on selecting the right motor protection circuit-breaker for your application. Our multilingual portal ensures seamless procurement for global projects, with fast delivery to minimize downtime.
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