Schneider Electric A9Z61440 Acti9 iID 4P 40 A 30 mA B-SI RCCB

A9Z61440: Acti9 iID 4P 40 A 30 mA type B-SI RCCB

The A9Z61440 is a Schneider Electric Acti9 iID residual current circuit breaker with 4 poles, a rated current of 40 A, a sensitivity of 30 mA and an earth-leakage protection class of type B-SI (Super Immunised). Type B covers smooth DC residual current as well as the waveforms of types A and AC, which is why this reference is listed by the datasheet for photovoltaic, three-phase speed drive and lift applications. Seven Star LLC supplies the A9Z61440 in Oman and the GCC as an independent supplier based in Muscat.

The reference is not decoded by the datasheet, so rely on the parameters on this page: 4P, 40 A, 30 mA, 400 V AC at 50 Hz and type B-SI. It is wider than the single-phase A9R devices, at 72 mm for 8 modules of 9 mm, and deeper at 73 mm.

Typical uses of the A9Z61440 in Oman and the GCC

In the region this unit is a candidate for lift and hoist supplies, desalination auxiliaries and EV charging feeders, where plain type A protection may not cover the DC content of the fault. Solar plants, pumping stations and buildings with lifts are the obvious fits. The final choice of RCD type is normally set by the equipment manufacturer and the project specification, so confirm it before ordering.

Technical specifications of the A9Z61440

Ratings and environment of the A9Z61440

The datasheet lists 40 A rated current, 500 V insulation voltage, 6 kV impulse withstand, pollution degree 3 and 20000 mechanical and 15000 electrical cycles. Operating temperature is -25 to 60 °C and storage is -40 to 85 °C, with operation up to 2000 m altitude. Protection is IP20 on the device, IP40 in a modular enclosure and IK05 against impact.

Photovoltaic and drive panels in Oman often run hot, so allow spacing from inverters, chokes and large contactors. The listed 60 °C is an ambient figure for the device, and the air inside a closed board can be well above room temperature.

Indicators and operation of the A9Z61440

The front carries the toggle with ON/OFF indication, a contact position indicator, a green LED showing that voltage is present and a trip indicator. The LED matters because a type B device needs supply to monitor smooth DC leakage in its electronics, while the tripping itself is listed as voltage independent. The datasheet does not describe the exact behaviour on loss of supply, so consult the manufacturer instructions for that.

The front also has a regular-test button. Press it after commissioning and then at the interval your maintenance plan sets; the toggle must be reset by hand after a trip.

Sensitivity and discrimination: 30 mA on the A9Z61440

With 30 mA and no delay, the A9Z61440 acts as a final-stage device for personal protection.

The table below places the A9Z61440 among the seven type B-SI references in this range. The 30 mA devices suit the protection of people, the 300 mA instantaneous devices suit fire-risk protection, and the 300 mA S devices are the upstream partners that allow discrimination.

Dimensions, terminals and wiring of the A9Z61440

This is a four-pole device that opens three phases and neutral together, for 400 V AC three-phase systems at 50 Hz. The body is 72 mm wide, 88 mm high and 73 mm deep and weighs 415 g. The extra 4 mm of height and depth compared with the type AC and A models is worth checking in shallow modular enclosures.

Terminals are double terminals. At the front they take 1 to 35 mm² rigid and 1 to 25 mm² flexible, with or without ferrule; at the back they take 1 to 25 mm² rigid and 1 to 16 mm² flexible. Strip 14 mm and tighten to 3.5 N.m. The neutral is on the left. A screw shield is listed as supplied equipment, and a padlocking device is available for locking the toggle open during maintenance.

Installation and testing of the A9Z61440

Isolate and prove dead, clip the A9Z61440 onto the DIN rail, connect the conductors following the diagram, strip 14 mm and torque to 3.5 N.m. Energise, confirm the green LED, then press the test button to see the device trip.

On drives and inverters, check the manufacturer’s earthing and RCD guidance for the equipment as well, because filter and cable lengths change the leakage current. Record the rating and sensitivity on the board schedule and investigate any real trip before closing the device again.

Information to send with an RFQ for the A9Z61440

• Exact reference A9Z61440 and the quantity needed.
• Application, for example PV, drive or lift, and the equipment manufacturer’s RCD requirement.
• Supply voltage and earthing system.
• Upstream protective device and its rating.
• Whether discrimination with 30 mA stages below is required.
• Delivery location and timeline.

Before ordering, check that the board enclosure, busbar arrangement and neighbouring devices leave enough room for heat to escape, since crowded boards in hot rooms run closer to their limits than the rated ambient suggests.

Keep a record of the installed ratings on the board schedule and note the supply voltage at commissioning, because later extensions and fault investigations depend on knowing exactly what protects each circuit.

Spare devices of the same rating, pole count, sensitivity and type are worth planning for sites that run continuously, since a like-for-like replacement keeps the original protection design intact after a trip or a fault.

If the board will be extended later, leave spare rail length and think about how added circuits change the leakage current seen by this device, which affects how close it runs to its trip threshold.

Documents and quotation

The Schneider Electric datasheet for the A9Z61440 is attached on this page and holds the full specification summarised above. It is dated 8 Nov 2026 as printed on the manufacturer’s document.

Send us the reference A9Z61440, quantity and delivery location and Seven Star LLC will reply to your request. We supply as an independent supplier based in Muscat and do not act for the manufacturer.