Power contactor

01

Size by utilisation category, current and ambient

ABB's motor protection and control catalogue describes its AF contactors as one range for motor starting and power switching: 3-pole contactors from 9 A up to 1,060 A AC-3 or up to 2,850 A AC-1, and 4-pole contactors up to 525 A AC-1. Its selection table gives AC-3 rated operational current at 400 V and ambient up to 60 °C (55 °C for mini contactors and the AF400–AF2650 sizes), AC-1 rated current at 690 V and ambient up to 40 °C, UL/CSA general-use ratings at 600 V, and NEMA sizes. [1]

The catalogue lists, for example, AC-3 ratings at 400 V of 9 A and 4 kW for the AF09 up to 116–146 A and 55–75 kW for the AF116–AF146, describing these as block-type contactors with three main poles for 3-phase motors and power circuits up to 690 V AC (AF146 up to 1,000 V AC) and up to 260 V DC. It notes that 1,000 V IEC ratings are available for AF80, AF96 and AF146–AF2650 contactors. [1]

Editorial note: in ABB's table the AC-1 current is higher than the AC-3 current for the same frame, so state the load type and ambient when asking for a size — a main-power contactor on a resistive load and a motor contactor of the same current may be different frames. [1]

The utilisation categories and ratings in these catalogues are defined by IEC 60947-4-1. The IEC webstore lists edition 5.0, published 2023-11-08 by subcommittee SC 121A (385 pages, now in a 2026-03 corrected version), as applying to electromechanical contactors and starters, including motor protective switching devices, contactor-relay actuators, contacts dedicated to the coil circuit and dedicated accessories, for distribution, motor and other load circuits whose rated voltage does not exceed 1 000 V AC or 1 500 V DC. It replaces the 2018 fourth edition; changes listed include adoption of the AC-7d category from IEC 61095:2023, an updated Annex C with the rationale for AC-3e, an updated method for measuring electromagnet (coil) power consumption, starters and contactors suitable for use downstream of a basic drive module, and references to IEC TS 63208 for cybersecurity and IEC TR 63201 for embedded software. [4] Editorial note: ABB's 1,000 V IEC ratings for its larger AF frames sit at the top of that 1 000 V AC scope; ask which edition of IEC 60947-4-1 the supplier's type tests follow, since coil consumption values and AC-3e ratings depend on it. [1] [4]

Give the supplier the load type (motor, resistive, transformer, mixed), utilisation category, rated current and voltage, ambient temperature, switching frequency and required electrical life, number of poles, coil control voltage (AC or DC) and its variation, auxiliary contacts, mechanical or electrical interlocks, overload relay, surge suppression, approvals (IEC, UL/CSA), mounting and quantity.

02

Choose the coil, poles and accessories

The catalogue describes the AF electronic coil interface as accepting a wide control-voltage range (for example 100–250 V AC and DC), with only four coils covering control voltages of 24–500 V at 50/60 Hz and 20–500 V DC, managing large control-voltage variations, reducing panel energy consumption, giving distinct closing and opening, withstanding short voltage dips and sags, and including built-in surge suppression. [1]

Listed accessories include front- and side-mounted auxiliary contact blocks, electronic timers, mechanical and mechanical/electrical interlocking units, reversing connection sets and surge suppressors (varistor, RC or transil types for other ranges), with thermal overload relays (class 10 or 10A) and electronic overload relays (classes 10E, 20E and 30E) matched to each contactor size. [1]

Editorial note: if the control supply is unstable or shared, a wide-range electronic coil reduces the number of coil variants to stock; confirm the dip-ride-through the coil is rated for if your supply has sags. [1]

03

Compare durability, coil power and size across frames

Schneider Electric's TeSys Deca LC1D09G7 datasheet rates the 9 A frame at 9 A AC-3 and 25 A AC-1 up to 440 V (4 kW at 400 V), with mechanical durability of 15 million cycles, electrical durability of 2 million cycles at 9 A AC-3 and 0.6 million at 25 A AC-1, a 120 V AC coil drawing 70 VA inrush and 7.5 VA hold-in, 12–22 ms closing time, IP20 front face, −40 to +60 °C ambient, 45 mm width and 0.32 kg; it gives B10d values of 1,369,863 cycles at nominal load and 20,000,000 cycles at mechanical load for EN ISO 13849-1. [2]

The 80 A LC1D80G7 in the same range is rated 80 A AC-3 and 125 A AC-1 (37 kW at 400 V), with 4 million mechanical cycles, 1.5 million cycles at 80 A AC-3 and 0.8 million at 125 A AC-1, a coil drawing 245 VA inrush and 26 VA hold-in, 20–35 ms closing time, 85 mm width and 1.59 kg. [3]

Editorial calculation: a contactor switching a motor 60 times an hour for 16 hours a day makes about 350,000 operations a year, so the 9 A frame's 2 million AC-3 cycles last about 5.7 years at that duty and the 80 A frame's 1.5 million about 4.3 years; B10d figures matter when the contactor is part of a safety function. [2] [3]

04

Find suppliers

The companies in the manufacturer list below show this product on their own websites. Confirm the legal seller, factory and scope for your order.

Ask any supplier for the AC-1 and AC-3 ratings at your voltage and ambient, electrical life at your duty and the coil data. [1]

05

Trace what each part controls

This is a functional reference built from the sources cited; it is not one maker's specification.

06

Fill the specification fields with values for your circuit

A contactor quotation needs values for your circuit. The table explains each field, gives published values where a reviewed source states them, and says what to obtain from the supplier.

07

Send the load, category and control data together

Paste it into your enquiry below or into an email to a maker, then replace every bracket.

Load: [motor; resistive; main supply]
Category: [AC-1; AC-3; other]
Rating: [A; V; ambient]
Poles: [3; 4]
Coil: [AC/DC; voltage range]
Accessories: [aux contacts; interlock; timer]
Overload: [thermal; electronic; class]
Quantity: [units]

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