Emerson 2147A48G11 Product Description
1. Product Overview
The Emerson 2147A48G11 is a heavy-duty magnetic contactor coil, originally engineered by Cutler Hammer (now part of Emerson’s industrial automation portfolio) as an Ampgard™ SJA series renewal part. Designed for medium-voltage motor control applications, this coil serves as the electromagnetic actuation core for vacuum break contactors, delivering reliable switching and load management in industrial power systems. Built to withstand rigorous operating conditions, it ensures consistent performance, long service life, and seamless integration into legacy and modern motor control centers (MCCs) across critical infrastructure sectors.
2. Key Features
2.1 Precision Electromagnetic Design
The 2147A48G11 features a high-grade copper winding and laminated steel core, optimized for 120V AC operation and 400A current ratings. Its precision-wound coil generates consistent electromagnetic force to actuate contactor mechanisms, ensuring smooth, reliable switching under full-load and transient conditions. The coil’s design minimizes energy consumption while maintaining high holding force, reducing heat buildup and extending operational longevity.
2.2 Robust Industrial Construction
Encapsulated in a NEMA 1-rated enclosure, the coil provides protection against dust, dirt, and incidental contact, making it suitable for indoor industrial environments. The rugged housing insulates internal windings from mechanical vibration, shock, and electrical interference, common in motor control and power distribution applications. High-temperature insulation materials and epoxy encapsulation safeguard against thermal degradation, ensuring stable performance in ambient temperatures up to 40°C (104°F).
2.3 Exact OEM Replacement Compatibility
Engineered as a direct Ampgard™ SJA series vacuum break contactor renewal part, the 2147A48G11 offers drop-in compatibility with original equipment, eliminating the need for modifications or additional hardware during replacement. It adheres to Cutler Hammer’s original design specifications, ensuring identical electrical and mechanical performance as the factory-installed coil. This compatibility reduces retrofit costs, minimizes downtime, and preserves system integrity in existing MCCs and motor control systems.
2.4 High Reliability & Low Maintenance
Constructed with industrial-grade materials and subjected to rigorous quality testing, the coil delivers exceptional reliability under continuous operation. Its sealed design prevents contamination of internal windings, reducing the risk of short circuits or insulation failure. The coil’s robust construction eliminates the need for routine maintenance beyond periodic visual inspections, lowering operational costs and enhancing system availability.
2.5 Optimized for Medium-Voltage Motor Control
Tailored for medium-voltage motor control applications, the 2147A48G11 supports heavy-duty motor starting, stopping, and load switching in industrial settings. It is ideal for use with vacuum break contactors in MCCs, providing precise control for large motors driving pumps, fans, compressors, and other high-power equipment. The coil’s high current rating and durable design ensure reliable performance in demanding power distribution environments.
3. Technical Specifications
Model: 2147A48G11
Brand: Emerson (formerly Cutler Hammer/Eaton)
Type: Magnetic Contactor Coil (Ampgard™ SJA Series Renewal Part)
Rated Voltage: 120V AC
Rated Current: 400A
Enclosure Rating: NEMA 1 (indoor use, dust-protected)
Compatibility: Ampgard™ SJA Series Vacuum Break Contactors (Size 1)
Construction: Epoxy-encapsulated copper winding, laminated steel core
Insulation Class: Class B (130°C temperature rating)
Dimensions: 7.7 in (L) × 4.7 in (W) × 2.5 in (H)
Weight: Approximately 2.3 kg (5.1 lbs)
Operating Temperature: 0°C to +40°C (32°F to 104°F)
Storage Temperature: –20°C to +60°C (–4°F to 140°F)
Vibration Resistance: Compliant with NEMA ICS 6
Certifications: UL, CSA, CE (industrial compliance)
Warranty: 12-month original manufacturer warranty
4. Product Advantages
4.1 Seamless OEM Replacement
As an authentic Emerson/Cutler Hammer renewal part, the 2147A48G11 ensures perfect fit and function with existing Ampgard™ SJA contactors, eliminating compatibility risks and simplifying maintenance. Its direct-replacement design reduces installation time and labor costs, minimizing unplanned downtime in critical motor control systems.
4.2 Enhanced System Durability & Safety
The coil’s robust construction and high-quality insulation materials reduce the risk of electrical faults, such as short circuits or winding burnout, enhancing overall system safety. Its reliable electromagnetic performance ensures consistent contactor actuation, preventing motor damage from unstable switching and extending the service life of connected equipment.
4.3 Cost-Effective Maintenance Solution
By providing a durable, low-maintenance replacement for aging coils, the 2147A48G11 eliminates the need for costly contactor assembly replacements. Its long service life and minimal maintenance requirements reduce ongoing operational expenses, making it a cost-effective choice for extending the lifespan of legacy motor control infrastructure.
4.4 Trusted Performance in Critical Applications
Backed by Emerson’s industrial engineering expertise, the coil delivers consistent, reliable performance in high-stakes environments where motor control failures can lead to costly production disruptions. Its compliance with global industrial standards ensures peace of mind for operators in power generation, manufacturing, and process industries.
5. Application Scope
Power Generation: Thermal, hydro, and cogeneration plants—controls large auxiliary motors (pumps, fans, compressors) in medium-voltage MCCs.
Oil & Gas: Refineries, offshore platforms, and pipeline facilities—manages high-power motors for crude oil processing, gas compression, and material handling.
Manufacturing: Heavy machinery, steel mills, and automotive plants—drives large production motors and conveyor systems in industrial MCCs.
Water & Wastewater Treatment: Large pump stations and treatment facilities—controls medium-voltage motors for water transfer, aeration, and sludge processing.
Legacy System Retrofits: Upgrades aging Cutler Hammer/Ampgard™ motor control systems across industrial sectors, ensuring continued reliability and compliance.
6. Installation & Maintenance
6.1 Installation
Ensure the contactor and associated power supply are fully de-energized before installation to prevent electrical shock. Align the 2147A48G11 coil with the contactor’s mounting brackets, ensuring proper alignment with the armature mechanism. Secure the coil using the original fasteners, tightening to the manufacturer’s specified torque. Connect the 120V AC control wiring to the coil terminals, verifying correct polarity and tight connections. After installation, restore power and test contactor actuation to confirm proper coil operation.
6.2 Routine Maintenance
Monthly: Perform a visual inspection of the coil housing for cracks, damage, or signs of overheating (discoloration). Check terminal connections for tightness and corrosion.
Quarterly: Verify contactor actuation smoothness; listen for abnormal humming or buzzing, which may indicate coil degradation or misalignment.
Annual: Clean the coil housing with a dry, soft cloth to remove dust and debris. Inspect winding insulation for signs of wear or damage. Test coil resistance using a multimeter to ensure it falls within the manufacturer’s specified range.
6.3 Fault Handling
Contactor Fails to Actuate: Check for loss of 120V AC power supply, loose or corroded terminal connections, coil winding open circuit, or mechanical misalignment between coil and armature.
Excessive Humming/Buzzing: Indicates coil core laminations loosening, insulation degradation, or voltage fluctuations. Replace the coil if damage is confirmed.
Overheating/Discoloration: Caused by overvoltage, overcurrent, or prolonged use beyond rated conditions. Inspect power supply and load; replace the coil if thermal damage is present.
7. Ordering Information
Model: 2147A48G11
Brand: Emerson (Cutler Hammer/Ampgard™)
Type: Magnetic Contactor Coil (120V AC, 400A, NEMA 1)
Compatibility: Ampgard™ SJA Series Vacuum Break Contactors (Size 1)
Packaging: Original anti-static packaging with installation instructions and compatibility documentation
Accessories: Optional mounting hardware and terminal lugs available separately
Warranty: 12-month factory warranty with global technical support and repair services
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