Siemens 3MT8140-1AB04 Power Contactor 140A, 75kW, 400V, 24V AC Coil, S6 Size Original Brand New

Overview

Siemens 3MT8140-1AB04 Power Contactor is a high-performance and exceptionally durable switching device, expertly engineered for demanding industrial motor control applications. As a core component of the globally recognized Siemens SIRIUS 3RT series, this 3-pole contactor is built to deliver outstanding reliability, precise performance, and an extended operational lifespan in diverse industrial environments worldwide.

Key Features & Function:

• High-Capacity Motor Switching: Designed specifically for AC-3 utilization category, the 3MT8140-1AB04 is ideally suited for efficiently switching inductive loads, particularly three-phase asynchronous motors. It boasts a substantial current rating of 140 Amperes and can reliably manage motor power up to 75 kW at 400V. This impressive capacity makes it an ideal solution for a wide array of medium to heavy-duty motor switching tasks, including pumps, fans, compressors, conveyors, and various types of manufacturing machinery.
• Low Voltage Control Coil: This Siemens contactor operates with a 24V AC control coil at 50Hz. This low voltage control is often preferred in industrial settings for enhanced safety and compliance with specific control system architectures, allowing for seamless integration into various automation setups.
• Robust & Compact Design (Size S6): Its size S6 designation indicates a powerful yet relatively compact unit within the SIRIUS modular system. This design offers flexibility for installation in control panels where space optimization is critical, while still providing robust performance for significant loads.
• Secure Screw Terminals: Equipped with reliable screw terminal connections for both main and auxiliary circuits, the 3MT8140-1AB04 ensures secure electrical contact. This simplifies wiring, reduces installation time, and provides robust connections that resist vibration and maintain integrity over long periods.
• Integrated Auxiliary Contacts: For enhanced control flexibility and comprehensive signaling capabilities, the contactor includes 2 normally open (NO) and 2 normally closed (NC) auxiliary contacts. These integrated contacts provide essential feedback for automation systems, enabling complex interlocking functions, precise status monitoring, and simplified diagnostics without the need for additional external modules.

Function

The primary function of the Siemens 3MT8140-1AB04 Contactor is to safely and efficiently switch high-power electrical circuits, typically for starting and stopping electric motors. It acts as a remote-controlled switch, allowing a low-power control signal (from the 24V AC coil) to control a much higher-power main circuit. Its AC-3 rating ensures it is optimized for frequent switching of inductive motor loads, managing the high inrush currents associated with motor startups and providing reliable disconnection under normal operating conditions. The auxiliary contacts offer additional functionality for signaling motor status (running, stopped) to PLCs or other control systems, implementing safety interlocks, and enabling complex automated sequences.

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