EATON Reversing Contactor 4 kW 400 V AC, 230 V 50 Hz Coil, 3-Pole, 2NO+2NC, DIN Rail 278086

Motor reversal in industrial control circuits often requires a pair of contactors plus a mechanical interlock, complicating wiring and panel layout. The EATON 278086 solves this by integrating two contactors and a mechanical/electrical interlock into one compact reversing contactor. It is rated for 4 kW at 400 V AC (AC-3) and 9 A operational current, with a 230 V 50 Hz coil. The 3-pole main circuit and 2NO+2NC auxiliary contacts suit reversing, star-delta, and two-speed motor applications. Screw terminals and DIN rail/screw mounting simplify installation.

Who is it for

Panel builders and maintenance technicians who need a reliable, space-saving reversing solution for small three-phase motors up to 4 kW. It is suitable for conveyors, pumps, fans, and machine tools where direction change is required.

Main features

• Integrated mechanical and electrical interlock prevents simultaneous energization of both contactors.
• Rated operational power: 4 kW at 400 V AC (AC-3).
• Rated operational current: 9 A at 400 V AC (AC-3).
• Control coil: 230 V AC, 50 Hz.
• 3 main poles, 2 NO + 2 NC auxiliary contacts.
• Rated insulation voltage: 690 V; impulse withstand voltage: 6 kV.
• Degree of protection: IP20 (terminals).
• Operating temperature: -25 to +60 °C.
• Mounting: DIN rail or screw mounting.
• Complies with IEC/EN 60947.

Specifications

• Product type: Reversing contactor
• Rated operational power (AC-3, 400 V): 4 kW
• Rated operational current (AC-3, 400 V): 9 A
• Control coil voltage: 230 V AC
• Control coil frequency: 50 Hz
• Number of main poles: 3
• Auxiliary contacts: 2 NO + 2 NC
• Interlock type: Mechanical and electrical
• Rated insulation voltage (Ui): 690 V
• Rated impulse withstand voltage (Uimp): 6 kV
• Degree of protection: IP20 (terminals)
• Operating temperature range: -25 to +60 °C
• Terminal type: Screw terminals
• Recommended fuse for motor protection (gG/gL): 20 A
• Electrical life (AC-3): 1.5 x 10^6 operations
• Mechanical life: 10 x 10^6 operations

Tips

Select a motor protection circuit breaker or fuse rated 20 A gG/gL for short-circuit protection. Ensure the coil voltage matches your control circuit (230 V 50 Hz). Mount on a standard 35 mm DIN rail or with screws, leaving adequate clearance for heat dissipation.