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Product Overview
While circuit breakers protect a grid from faults, AC Contactors are the hard-working muscles that actually drive the facility. In automated factories and commercial climate control systems, motors must start and stop hundreds of times a day. Standard mechanical switches would burn out within hours under this stress. The CHNAILE Heavy-Duty 3-Pole Magnetic AC Contactor is built to thrive in this high-frequency environment. Utilizing a powerful 220VAC electromagnetic coil, it allows remote, low-effort signals to instantly switch massive 18-Ampere (up to 7.5kW/10HP) three-phase loads. Featuring premium anti-welding contacts and a ruggedized kinetic core, it guarantees years of uninterrupted automation for OEM machinery builders and HVAC manufacturers.
Technical Parameters
Device Category: | AC Magnetic Contactor / Motor Starter |
|---|---|
Main Poles Configuration: | 3P (Three Normally Open Main Contacts) |
Rated Operational Current (Ie): | 18A (AC-3 Category for Squirrel-cage motors) |
Control Coil Voltage (Us): | AC 220V (50/60Hz) |
Max Motor Power Capacity: | ~7.5kW at 400V |
Auxiliary Contacts: | Integrated NO (Normally Open) + NC (Normally Closed) blocks |
Mechanical Life: | > 10 Million operations |
Electrical Life: | > 1 Million operations at full load |
Installation: | 35mm DIN-Rail Snap-on or Screw Mount |
Standard Compliance: | IEC/EN 60947-4-1 |
1. High-Frequency Automation Control
AC-3 Motor Inrush Mastery: Starting an induction motor draws a transient current 5 to 7 times higher than its running load. The massive silver-alloy contact pads within this contactor are specifically metallurgically formulated to absorb these brutal inrush currents continuously without micro-welding or severe carbon pitting.
Rapid Electromagnetic Actuation (220V Coil): The heart of the unit is a low-loss 220VAC copper wound coil (A1/A2 terminals). When energized by a remote switch, thermostat, or PLC, it generates a profound magnetic field that slams the 18A main contacts shut in milliseconds, ensuring a crisp, zero-hesitation motor startup.
Integrated Logic Control (Auxiliary Contacts): Outfitted with built-in NO and NC auxiliary terminals. These low-current side contacts are essential for creating complex industrial "Self-Latching" circuits, safety interlocks, and sending real-time operational feedback to centralized SCADA systems.
2. Industrial-Grade Structural Engineering
V0 Flame-Retardant Kinetic Housing: The rapid closing of contacts generates physical shock and arc flashes. The enclosure is molded from dense, V0-rated thermosetting plastics that absorb relentless mechanical vibrations and prevent internal arc propagation during high-load disconnections.
Enclosed Arc Chute Design: When the magnetic coil is de-energized to stop the motor, a destructive arc is formed. The internal architecture forces this arc into built-in metallic splitter plates, instantly cooling and neutralizing the plasma to protect the primary contact faces.
Dual Mounting Flexibility: Engineered for the modern panel builder. The base features a high-tension spring clip for rapid 35mm DIN-rail integration, alongside reinforced screw holes for rigid, vibration-proof backplate mounting inside heavy machinery chassis.
3. Target Application Scenarios
Due to its robust 18A (AC-3) rating and millions of operational cycles, this magnetic contactor is the prime specification for:
Commercial HVAC & Refrigeration: Serving as the ultra-reliable compressor relay inside large rooftop air conditioning units, heat pumps, and commercial cold storage systems.
Automated Conveyor Logistics: Providing the high-frequency START/STOP muscle for 3-phase electric motors driving kilometers of sorting belts in warehousing hubs.
Agricultural Pumping Stations: Acting as the remote-controlled main switch for deep-well irrigation pumps triggered by automated soil-moisture sensors.
Centralized Lighting Arrays: Managing the heavy inductive loads of stadium floodlights and commercial mall lighting circuits via a single low-power timer or photocell.
4. Global B2B Partnership with CHNAILE Factory
Factory-Direct Automation Supply: Eliminate trader markups on essential control components. Sourcing 18A contactors directly from our manufacturing lines drastically lowers the BOM for your OEM machinery and HVAC production lines.
Rigorous Coil & Contact Endurance Testing: We do not guess on longevity. Every batch undergoes grueling, multi-day automated switching cycles in our labs to guarantee the 220V coil logic and silver contacts meet the stringent IEC 60947-4-1 lifecycle mandates.
OEM Labeling for Machinery Brands: We actively support global machine builders and HVAC brands, providing tailored OEM faceplate printing, custom coil voltage configurations (e.g., 24V, 110V), and specialized bulk packaging.
