Electrical power & protection
Industrial Contactor Replacement Guide
A contactor that looks identical can have the wrong coil, current rating, utilization category, poles, or auxiliary-contact arrangement. Preserve the complete reference and verify both the load side and control side before selecting a replacement.
Record the manufacturer, full contactor number, coil code, installed auxiliary blocks, overload relay, suppressor, and any reversing or mechanically interlocked arrangement.
Record the controlled load, rated operational current, motor power where applicable, supply voltage, and whether the duty is AC-1, AC-3, AC-4, or another documented utilization category.
Capture coil voltage, AC or DC type, frequency where applicable, control-voltage range, and how the PLC, relay, or control transformer drives the coil.
Record main-pole count plus the quantity and state of built-in and add-on NO/NC auxiliary contacts.
Record DIN-rail or panel mounting, terminal style, dimensions, wiring space, interlocks, and any starter enclosure constraints.
Capture overload device, short-circuit protective device, SCCR or coordination requirements, and applicable approvals.
Match the rating for the actual load and switching duty; an AC-1 amp rating is not a substitute for an AC-3 motor rating.
Coil voltage, AC/DC type, operating range, suppression, PLC compatibility, and control wiring must suit the existing circuit.
Verify pole count, NO/NC auxiliary states, contact ratings, and any interlocking or sequencing function.
Confirm the contactor remains properly coordinated with the overload and upstream short-circuit protection.
Mounting, terminal layout, conductor size, enclosure clearance, and accessory fit must work in the existing starter.
Schneider Electric documents different utilization categories because contactor making and breaking duties depend on the load and operating cycle.
The same contactor frame can be offered with different control voltages and coil technologies.
A replacement can switch the main load correctly and still break machine logic if its auxiliary contacts differ.
Contactor, overload, short-circuit protection, interlocks, and accessories can function as a coordinated assembly.
Not on current alone. Verify utilization category, load, voltage, poles, coil/control supply, auxiliary contacts, mounting, protection coordination, and approvals.
AC-3 describes motor switching duty and can carry a different usable current rating than AC-1 resistive-load duty on the same contactor family.
No. Coil, contact configuration, ratings, terminal arrangement, accessories, and coordination can differ inside the same general frame size.