Eaton ZB12-6 Thermal Overload Relay, 4-6 A, 3-Pole, Class 10A, Direct Mounting 278439

With a current setting range of 4 to 6 A and a 3-pole design, the Eaton ZB12-6 thermal overload relay provides reliable motor protection in a compact form factor. Its Class 10A trip characteristic ensures fast response to overload conditions, while phase failure sensitivity adds an extra layer of safety for three-phase motors.

Overview

The ZB12-6 is designed for direct mounting onto compatible Eaton contactors, simplifying installation and reducing wiring complexity. It features both manual and automatic reset functions, allowing flexibility in how the relay responds after a trip event. A trip indication flag provides clear visual status, and the unit includes one normally open (NO) and one normally closed (NC) auxiliary contact for control circuit integration.

What stands out

• Wide operating temperature range from -25°C to 55°C for demanding environments.
• Rated insulation voltage of 690 V AC and impulse withstand voltage of 6 kV.
• Complies with IEC/EN 60947-4-1, VDE 0660, UL, and CSA standards.
• IP20 degree of protection suitable for installation in enclosed panels.

Technical details

• Product type: Thermal overload relay
• Current setting range: 4 - 6 A
• Number of poles: 3
• Overload release class: Class 10A
• Mounting: Direct to contactor (compatible with DILM7, DILM9, DILM12, DILM15)
• Auxiliary contacts: 1 NO + 1 NC
• Reset: Manual/automatic
• Rated insulation voltage (Ui): 690 V AC
• Rated impulse withstand voltage (Uimp): 6 kV
• Operating temperature: -25 to 55 °C
• Storage temperature: -40 to 80 °C
• Phase failure sensitivity: Yes
• Trip indication: Yes
• Colour: Black/White

Our verdict

The Eaton ZB12-6 is a robust and precise thermal overload relay for small to medium three-phase motors. Its direct mounting to popular DILM contactors and compliance with major international standards make it a dependable choice for industrial control panels.