Schneider Electric A9C20834 iCT 25 A 4NO 220-240 V Contactor

A9C20834: four-pole 25 A contactor for three-phase and neutral switching

The A9C20834 is a Schneider Electric Acti9 contactor listed in the datasheet as: contactor iCT – 4 poles – 4 NO – 25 A – 220..240 V AC. With four normally open poles in a four-pitch (36 mm) body, the A9C20834 can switch the three phases and the neutral of a 400 V circuit at up to 25 A. The coil is still a 220 to 240 V AC device, so the contactor can be operated from the same single-phase control supply used for lighting and for small panel controls. Seven Star LLC supplies the A9C20834 in Oman and the GCC as an independent supplier based in Muscat.

The coding is the Acti9 contactor family A9C, the 25 A size, four poles, all normally open (4P, 4 NO) and a 220 to 240 V AC 50 Hz coil. Compared with the single-pole and two-pole references, the datasheet gives a higher rated operational voltage of 400 V AC at 50 Hz and a coil with 4.6 VA hold-in and 34 VA inrush.

Technical specifications of the A9C20834

Power circuit and coil data of the A9C20834

The rated operational current is 25 A AC-7A; 8.5 A AC-7B. Rated operational voltage: 400 V AC 50 Hz. Maximum power figure: 1.6 W at 400 V AC. Coil voltage: 220 to 240 V AC 50 Hz. Hold-in consumption: 4.6 VA. Inrush consumption: 34 VA. Rated insulation voltage: 500 V AC 50/60 Hz. Rated impulse withstand voltage: 4 kV. Mechanical durability: 1000000 cycles.

The jump from 9.2 VA to 34 VA inrush is the number to remember. The coil of this four-pole body is a larger electromagnet, and a control output that was marginal on a 2-pole contactor can struggle here. If a PLC relay or a time switch contact drives several of these coils, add up the inrush and the hold-in figures before sizing the control contact.

AC-7A and AC-7B ratings of the A9C20834: reading the load categories

It helps to read the datasheet current as a category-specific figure. The A9C family is built for building and light-commercial installations, so its categories refer to household-type duty. If a load is an ordinary resistive element, the AC-7A value applies; if it is a small appliance motor, the AC-7B value applies; if it is a heavy motor, a different product is correct.

Electrical durability in the datasheet: 100000 cycles IEC/EN 61095 25 A 50 Hz AC-7A; 30000 cycles IEC/EN 61095 8.5 A 50 Hz AC-7B; 30000 cycles IEC/EN 61095 50 Hz AC-7C.

How the A9C20834 compares with neighbouring iCT contactors

The A9C20732 differs in poles 2P against 4P here; contacts 2 NO against 4 NO here; coil 230 to 240 V AC 50 Hz against 220 to 240 V AC 50 Hz here; width 18 mm against 36 mm here. The A9C20838 differs in contacts 2 NO + 2 NC against 4 NO here.

The table below lists the iCT references of this group with their main differences so that a purchase order can be checked against the family.

Selection checklist for the A9C20834

• Count the poles actually needed (three phases only, or three plus neutral) before choosing between 3-pole and 4-pole references.
• Match the control supply: the coil is 220 to 240 V AC, not 24 V.
• Match coil voltage and frequency to the control supply; this reference uses 220 to 240 V AC 50 Hz.
• Check the width of 36 mm (4 pitches) against free rail space and spare gaps for heat.
• Confirm the number of operations per day stays within the datasheet figure.

Mounting, wiring and maintenance of the A9C20834

Maintenance is mostly visual: check terminals for discolouration, re-torque after the first weeks of load cycles, and listen for coil hum, which the datasheet puts at 30 dB noise level. A loud buzz usually means an under-voltage coil or a dirty pole face. In dusty coastal sites an enclosure with filters or sealing helps, because the device is protected to IP20 only.

The datasheet lists the environment as -5 to 60 °C in operation and -40 to 70 °C in storage, relative humidity of 95 % at 55 °C, an altitude limit of 2000 m and pollution degree 2.

Where the A9C20834 is used in Oman and the GCC

A four-pole 25 A contactor is a common choice for switching small three-phase loads with neutral: floor-by-floor lighting distribution, a bank of electric heaters, a car-park lighting feeder or a small pump set. In Muscat commercial buildings it is often found in the electrical room of a mall or office tower as the ‘on-off’ device for a lighting circuit controlled by a building management system.

Check the actual load type before relying on the 25 A figure. The datasheet quotes the current for AC-7A (slightly inductive household-type loads) and only 8.5 A for AC-7B motor-type loads, so a three-phase motor at the upper end of this contactor’s range should be checked against the category and against a proper motor starter if the duty is heavy.

Information to send with an RFQ for the A9C20834

• Full reference (A9C20834) and quantity required
• Supply and control voltage at site, with the frequency
• Existing panel, rail and neighbouring devices it must fit beside
• Delivery location and timing
• Whether it is a spare, a like-for-like replacement or a new installation
• Load type and current: lighting, heating or motor-type

Documents and quotation

A datasheet for the A9C20834 is attached on this page. It lists the electrical, mechanical and environmental data summarised above, and it should be read together with the manufacturer’s installation instructions for the final design.

Send us the part number, quantity and application and we will confirm availability and a quotation. Seven Star LLC is an independent supplier in Muscat and is not affiliated with the manufacturer.