ABB ef65-56 electronic overload relay 20a - 56a

Why Choose the ABB EF65-56 Electronic Overload Relay?

The ABB EF65-56 electronic overload relay is a high-performance motor protection device designed to provide accurate and dependable protection against overload currents and phase failure in industrial motor applications. Identified by part number 1SAX331001R1102, this relay belongs to the advanced ABB EF65 electronic overload relay series, developed for demanding industrial automation and motor control systems.

The EF65-56 is a self-supplied electronic overload relay, meaning no additional external control power supply is required for operation. Compared with traditional thermal overload relays, it offers improved protection precision, selectable trip classes and a significantly wider adjustment range for enhanced flexibility across varying motor starting conditions.

With an adjustable current setting range of 20 to 56 A, integrated 1 NO + 1 NC auxiliary contacts, selectable trip classes 10E, 20E and 30E, and both automatic and manual reset functionality, the EF65-56 provides reliable motor protection while supporting direct mounting onto compatible ABB contactors for simplified installation and compact panel layouts.

Key Advantages

• Reliable electronic overload and phase failure protection.
• 20–56 A adjustable current range.
• Self-powered operation with no external supply required.
• Selectable trip classes 10E, 20E and 30E.
• Integrated 1 NO + 1 NC auxiliary contacts.
• Automatic or manual reset selectable.
• Temperature compensated protection with trip indication.

Key Features

• ABB EF65 electronic overload relay series.
• 20–56 A setting range.
• 3-pole motor protection relay.
• Integrated phase failure sensitivity.
• Trip classes 10E, 20E and 30E selectable.
• Integrated 1 NC trip contact.
• Integrated 1 NO signal contact.
• STOP and TEST buttons integrated.
• Direct mounting onto ABB contactors.
• Wide operational temperature range and high protection accuracy.

Technical Specifications

• Manufacturer: ABB
• Series: EF65
• Model: EF65-56
• Part number: 1SAX331001R1102
• Product type: Electronic overload relay
• Current setting range: 20–56 A
• Rated operational current: 56 A
• Trip classes: 10E / 20E / 30E selectable
• Rated operational voltage: Up to 1000 V AC
• Rated insulation voltage: 1000 V
• Number of poles: 3
• Auxiliary contacts: 1 NC + 1 NO
• Connection type: Screw terminals
• Degree of protection: IP20
• Mounting type: Direct attachment to contactor
• Voltage type: Self-powered
• Frequency: 50 / 60 Hz
• Operating temperature: approx. -25 °C to +70 °C
• Standards: IEC/EN 60947-4-1
• Dimensions (W × H × D): approx. 70 × 131.2 × 105.2 mm
• Weight: approx. 0.82 kg

Advanced Electronic Motor Protection

Electronic overload relays continuously monitor motor current and react quickly to overload or phase loss conditions, helping prevent overheating, insulation damage and unexpected downtime. Compared with thermal overload relays, electronic overload relays provide improved accuracy, greater flexibility and selectable trip characteristics for different motor starting requirements.

The ABB EF65 series is widely used in industrial automation, motor control centres and heavy-duty machinery applications where accurate motor protection, dependable operation and flexible configuration are essential for efficient industrial performance.

Typical Applications

• Industrial motor starters and control panels.
• Conveyors and material handling systems.
• Pumps, compressors and ventilation equipment.
• OEM machinery and automation systems.
• Industrial process control applications.
• HVAC and building automation systems.

Trusted by Industrial Automation Engineers

ABB EF electronic overload relays are trusted worldwide for accurate motor protection, flexible trip settings and dependable performance in industrial automation and heavy-duty machinery applications.