Onesto MC3 54mm Modular Contactor – 4-Pole | 32A, 40A & 63A | 230V Coil | DIN Rail

The Onesto MC3 range is a heavy-duty 4-pole DIN rail modular contactor designed for switching electrical loads in residential, commercial, and light industrial distribution boards. With a 54mm DIN rail footprint and a 230V AC control coil, the MC3 range is a direct fit for standard DB boards where higher current switching is required. Available in 32A, 40A, and 63A ratings across three contact configurations (4NO, 2NO+2NC, and 3NO+1NC) to suit a wide range of switching, automation, and control circuit applications. Conforms to IEC60947-5-1.

• Brand: Onesto
• Current Ratings: 32A (AC-7a), 40A (AC-7a), 63A (AC-7a)
• Poles: 4-pole
• Control Voltage: 230V AC
• Contact Configurations: 4NO, 2NO+2NC, 3NO+1NC
• DIN Rail Width: 54mm
• Standard: IEC60947-5-1

Key Features

• 4-pole design provides full switching of all conductors – suitable for total load isolation
• 54mm modular DIN rail width – fits standard distribution boards and enclosures
• Standard 230V AC control coil – compatible with most domestic and commercial control circuits
• Available in 32A, 40A, and 63A to cover a wide range of load switching requirements
• Three contact configurations: 4NO for simple switching, 2NO+2NC and 3NO+1NC for combined control circuit applications
• Rated insulation voltage 500V (UI) and impulse withstand voltage 4kV (UIMP) for robust performance
• Conforms to IEC60947-5-1 for reliable, standards-compliant operation

Typical Applications

• Lighting circuit automation in commercial and residential DB boards
• Water heater, geyser, and thermal load switching
• Pool pump, borehole pump, and irrigation system control
• HVAC and air conditioning load switching
• Solar and energy management load control
• Three-phase motor starting circuits (contactors only – overload relay required separately)
• General 4-pole load switching in distribution boards and control panels

Technical Specifications

Variant Reference

What's Included

• 1 x Onesto MC3 Modular Contactor in selected current rating and contact configuration

Please note: Control wiring, overload relays, auxiliary contacts, timers, and DIN rail mounting hardware are not included. For motor starting applications, a correctly rated overload relay must be used in conjunction with this contactor.

Installation & Compatibility Notes

• Confirm your required current rating (32A, 40A, or 63A) based on the full load current of the load being switched.
• Control coil voltage is 230V AC – ensure your control circuit operates at 230V before ordering.
• Select 4NO for simple load switching; 2NO+2NC or 3NO+1NC where control circuit interlocking or signalling is required.
• The 54mm DIN rail footprint requires adequate panel space – confirm DIN rail availability before ordering.
• For motor applications, always pair with an appropriately rated overload relay and confirm the AC-7b auxiliary rating is sufficient for your control circuit.
• Installation must be carried out by a suitably qualified electrician in accordance with SANS 10142.

Warranty & Support

This product is supplied with the applicable manufacturer or supplier warranty, subject to correct installation, correct application, and warranty terms. Zisabo is an Onesto distributor and supplies quality electrical products with practical support to help customers choose the correct item for their application. If you are unsure which variant suits your application, contact us before ordering.

Need help choosing? Contact Zisabo with your load type, full load current, and control circuit requirements and we will help you select the correct MC3 variant.