Siemens 3MT8120-1AQ24 Contactor AC-3, 120A/55kW,400V, 2NO2NC, 380 VAC, 50/60 Hz, 3-pole, size S6 Original Brand New

Overview: Siemens 3MT8120-1AQ24 High-Capacity Industrial Contactor

The Siemens 3MT8120-1AQ24 is a high-capacity AC-3 contactor, precisely engineered for the reliable and efficient switching of medium to large motors and inductive loads in a wide array of industrial applications. This robust 3-pole contactor, sized S6, is a fundamental component for motor control centers and power distribution systems. Designed for 400V main circuits, it effectively manages currents up to 120 Amperes and power ratings of 55kW, ensuring stable and consistent operation for demanding machinery. With its durable construction and precise engineering, the 3MT8120-1AQ24 is an excellent choice for new installations and critical system upgrades, offering long-term reliability in diverse industrial settings.

Key Features & Specification

• Model: Siemens 3MT8120-1AQ24
• Contactor Type: AC-3 (optimized for making, breaking, and occasional starting of squirrel-cage motors)
• Rated Current: 120 Amperes (A)
• Rated Power: 55 Kilowatts (kW) at 400V
• Rated Operational Voltage (Main Circuit): 400 Volts (V) AC
• Auxiliary Contacts: 2 Normally Open (NO) + 2 Normally Closed (NC) for extensive control circuit flexibility, enabling complex interlocking and feedback solutions.
• Control Coil Voltage: 380 VAC (50/60 Hz) – a common control voltage in many industrial power systems.
• Poles: 3-pole configuration, ideal for three-phase motor control.
• Size: S6 (A significant industrial size, indicating substantial power handling capacity)
• Terminals: Robust screw terminal connections for secure, high-current wiring, ensuring maximum reliability.
• Durability: Manufactured by Siemens, guaranteeing exceptional quality, extended service life, and high operational reliability in various industrial environments.

Function & Application

The Siemens 3MT8120-1AQ24 Contactor serves as an essential electromagnetic switch, providing remote and automated control over medium to high-power electrical circuits. Its primary function is to safely and efficiently establish or interrupt the flow of electrical current to industrial motors, significant resistive loads, and other demanding equipment. The 380 VAC control coil facilitates seamless integration into automated control systems, significantly enhancing both operational safety and overall system efficiency.

Common applications where this 120A 400V contactor excels include:

• Controlling motors in manufacturing plants, processing lines, and material handling systems.
• Switching large pumps, compressors, and fans.
• Industrial heating and lighting circuit control.
• Integration into automated machinery and power distribution panels.
• Applications requiring robust and reliable power switching for medium to high-power loads.