Schneider Electric A9F54340 iC60H 3P 40A C Circuit Breaker

A9F54340: three-pole 40 A C-curve miniature circuit breaker

The A9F54340 is a Schneider Electric Acti9 iC60H miniature circuit-breaker, listed in the datasheet as Acti9 iC60H 3P 40A C Miniature Circuit breaker. The reference describes a 3P device rated 40 A with a C trip curve, built for AC and DC networks with a thermal-magnetic trip unit. The datasheet gives a breaking capacity of 30 kA Icu at 220–240 V AC under EN/IEC 60947-2, which is the headline figure for a 230 V network. Seven Star LLC supplies the A9F54340 in Oman and the GCC as an independent supplier based in Muscat.

The datasheet for this reference carries the date 8 Nov 2026 and does not state a lifecycle status, so confirm availability before ordering. A 40 A rating serves sub-distribution feeders, large heaters and the supply of small motor starters or process cabinets. The datasheet also lists compatibility with add-on residual current devices: Vigi iC60 single terminal add-on residual current device 40/63 A; Quick Vigi iC60 single terminal add-on residual current device 40 A.

Technical specifications of the A9F54340

The A9F54340 within the iC60H C-curve listing

The closest same-width neighbours in this listing are A9F54332 (32 A) and A9F54350 (50 A), which share the housing and differ in the thermal setting. The same 40 A rating in another pole count is listed as A9F54440 (4P, 72 mm wide). The table lists every reference of this device and curve that appears in our catalogue range.

Information to send with an RFQ for the A9F54340

• Full reference (A9F54340) and quantity
• Supply voltage, frequency and AC or DC use at the installation point
• Prospective short-circuit current and the load or cable the breaker protects
• Existing board, rail and neighbouring devices, including any add-on residual current device
• Delivery location, timing, and whether the order is a spare or a new installation

Where the A9F54340 is used in Oman and the GCC

In Oman and the GCC the iC60 family appears in commercial buildings, industrial distribution boards, utility auxiliary panels and process cabinets. The A9F54340 fits circuits where a 40 A three-pole C-curve breaker with this fault capacity is needed in a compact 9 mm module. Gulf plant rooms combine heat, dust and humidity; the datasheet gives operation from -35–70 °C, relative humidity of 95 % at 55 °C and tropicalisation class 2, so site conditions should be compared against these limits and against the derating practice of the board builder.

Using a 40 A rating: what the A9F54340 protects

The upper ratings carry heavier cables, so the terminal capacity and the tightening torque matter more here. A loose heavy conductor is a classic cause of local overheating, and the fault level on the supply side becomes relevant: the breaker must be able to clear the prospective short-circuit current at its installation point.

The C curve trips magnetically at 8 × In ± 20 %. In general engineering practice a C curve is chosen for mixed loads with moderate starting currents, such as lighting, small motors and power supplies, rather than for loads with extreme inrush.

Breaking capacity of the A9F54340 by voltage band

Breaking capacity is the figure that decides whether a breaker can be installed at a given point of the network. Icu is the ultimate capacity; Ics is the service capacity, expressed as a share of Icu, after which the device is still expected to remain serviceable. For the A9F54340 the datasheet lists the following.

The datasheet adds a rated short-circuit capacity Icn of 10000 A at 415 V AC 50/60 Hz under EN/IEC 60898-1, the household-standard rating. The limitation class is 3, which describes how strongly the device limits the let-through energy of a short circuit. Compare these values with the prospective fault current at the installation point; if the supply side can exceed them, the design needs a higher-rated device or upstream back-up protection.

3P construction of the A9F54340

As a three-pole device, it opens all three phases with a common handle and occupies six 9 mm pitches (54 mm) of rail. It is intended for three-phase feeders, three-phase equipment and distribution outgoing ways at 380 to 415 V AC. A common trip is important for three-phase loads, because a single-phase condition left unattended can overheat connected motors.

Net weight is 0.375 kg and the body is 54 mm wide, 85 mm high and 78.5 mm deep, so a panel layout should reserve 54 mm of rail per device plus a small gap for heat when several breakers sit side by side.

Installation and maintenance of the A9F54340

The A9F54340 clips onto a rail; the datasheet lists the mounting mode as clip-on. Strip conductors to 14 mm and tighten terminals to 3.5 N.m, using a calibrated screwdriver. Terminals accept 35 mm² rigid and 25 mm² flexible conductors at either the top or the bottom. The handle can be padlocked in the off position for isolation during maintenance; the datasheet also lists a sealable handle with cable of 0.7 mm diameter in the on or off position.

Check periodically that the trip indicator is clear, that the handle moves freely and that terminals have not discoloured. Mechanical durability is 20000 cycles and electrical durability is 10000 cycles. A device that has cleared a heavy fault should be inspected and replaced rather than assumed intact.

Documents and quotation

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

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.