Introduction to ABB E3EFa HENF452750R1
HENF452750R1 Product Overview
The ABB E3EFa HENF452750R1 is an advanced electronic overload relay designed to provide reliable protection for electric motors in industrial applications such as manufacturing, food & beverage, water treatment, and HVAC systems. As a critical component in motor control circuits, it monitors motor operating conditions in real-time, detecting faults including overload, phase failure, and current imbalance to prevent motor damage and ensure operational safety. A standout feature is its self-powered design, eliminating the need for an external power supply and simplifying installation by directly connecting to contactors. It combines the ease of use of traditional thermal overload relays with enhanced protection accuracy and diagnostic capabilities, making it suitable for standard motor applications requiring efficient and low-maintenance protection.
HENF452750R1 Technical Specifications
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Product Model: E3EFa HENF452750R1
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Product Type: Electronic Overload Relay
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Core Functions: Motor overload protection, phase failure detection, current imbalance monitoring, fault signal output, self-diagnosis
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Rated Current Range: Suitable for motors with rated operating current up to 45A
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Protection Features: Adjustable overload trip class (e.g., 10, 20, 30); Phase loss protection; Current unbalance protection (≥30% deviation)
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Power Supply: Self-powered by motor main current, no external power supply required
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Electrical Connections: 3-pole design; Direct connection to contactors; Compatible with standard motor control circuit terminals
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Output Signals: Normally closed (NC) auxiliary contact for fault indication; Contact rating: AC 250V/5A
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Operating Environment: Temperature range -25°C to +60°C; Humidity 5-95% (non-condensing); Vibration resistance 5g (10-500Hz)
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Mechanical Dimensions: Compact design for panel/rail mount; Compatible with standard motor control cabinets
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Weight: Approximately 0.3kg
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Installation & Maintenance: Tool-free wiring terminals; Easy-to-adjust setting knobs; Low maintenance requirements
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Certifications: CE, UL, IEC 60947-4-1 compliant; Suitable for global industrial applications
Recommended ABB Products
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ABB AF Contactor Series: High-performance contactors that work with E3EFa HENF452750R1 to form a complete motor control and protection circuit in manufacturing plants.
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ABB Tmax Circuit Breakers: Molded case circuit breakers that coordinate with E3EFa HENF452750R1 for comprehensive electrical system protection in HVAC applications.
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ABB ACS580 Inverter: Variable frequency drive that communicates with E3EFa HENF452750R1 to monitor motor load and prevent overload in water treatment systems.
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ABB Motor Control Centers (MCCs): Integrated MCC solutions that house E3EFa HENF452750R1 for centralized motor management in food & beverage factories.
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ABB EF45 Overload Relay Series: Complementary overload relays with different current ratings, compatible with E3EFa HENF452750R1 for diverse motor applications.
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ABB CM-Monitor Series: Condition monitoring devices that integrate with E3EFa HENF452750R1 to provide predictive maintenance alerts for motors.
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ABB Unigear Switchgear: Medium-voltage switchgear that coordinates with E3EFa HENF452750R1-protected motors for reliable power distribution in industrial facilities.
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