Schneider Electric A9E18070 Acti9 iSSW 20 A 1 C/O Linear Switch

A9E18070 iSSW linear changeover switch: what it does and where it sits

The A9E18070 is a Schneider Electric Acti9 iSSW linear switch, listed in the datasheet as a changeover switch with one pole, one changeover contact (1 C/O), 20 A, 250 V AC and a two-position toggle. It is a manual device: a person moves the lever between the two marked positions, and the circuit connected to the common terminal follows. Seven Star LLC supplies the A9E18070 in Oman and the GCC as an independent supplier based in Muscat.

Its job on a DIN rail is modest but useful. It gives a distribution board a hand-operated selector or on/off point in the same 18 mm module width as a miniature circuit breaker, so a service circuit, a lighting group or a control feed can be isolated or changed over without opening a separate wall box. The housing is white and the front carries the marking 0-1 for the two positions.

Technical specifications of the A9E18070

Electrical ratings of the A9E18070 and what the AC-22 figure means

The datasheet gives a rated operational voltage of 250 V AC at 50/60 Hz and a rated operational current of 20 A. Electrical durability is stated as 30,000 cycles in category AC-22 with a power factor of 0.8. AC-22 is the IEC category for mixed resistive and inductive loads with moderate overloads, so the figure speaks for a circuit made up of lighting, small heaters and light inductive loads, not for a motor that starts under load.

Two standards are listed for the A9E18070: IEC 60669-1, which covers switches for household and similar fixed installations, and IEC 60947-5-1, the standard for control circuit devices. The pair places the product between building wiring and control-panel duty, which is where DIN-rail selector switches usually work.

How the changeover contact of the A9E18070 is used in practice

A changeover contact has one common terminal that connects to either of two other terminals. That gives three common arrangements. As a simple on/off switch, only the common and one output terminal are used, and the other output stays unused. As a selector, the common terminal is the supply and the two outputs go to two different circuits or two sources, so only one is live at a time. As a two-way (staircase) element, two of these devices can be connected in series to switch one lamp from two places, although the standard impulse relays of the same range do this more cleanly for more than two points.

The datasheet lists staggered tunnel terminals on the underside, taking two conductors of 0.5 to 2.5 mm squared, flexible, or rigid without a ferrule, with a 9 mm strip length and a tightening torque of 1 N.m. That determines what can be wired: two conductors per terminal is practical for a loop feed, but a heavy-gauge cable for a 20 A load needs a check against the 2.5 mm squared limit.

Mounting and dimensions of the A9E18070

The A9E18070 clips onto a 35 mm DIN rail, occupies two 9 mm pitches (18 mm width), and measures 82 mm in height and 75 mm in depth. The depth is greater than that of many modular devices in the same range, so the cover or door of the enclosure should be checked: a shallow door may leave no clearance in front of the lever. Mounting position in the rail is free, but the lever is easiest to use in a row at hand height, away from the top of tall boards.

Pollution degree 3, tropicalisation 2 and an IP20 protection degree to IEC 60529 are listed. IP20 means finger-safe only, with no protection against dust or water, so the switch belongs inside a closed board and not on an open wall. Relative humidity of 95 percent at 55 degrees C is stated, which suits the humid coastal conditions of Oman once the board itself is sealed.

Environmental limits and sizing notes for the A9E18070

The datasheet gives an ambient range of -20 to 50 °C for operation and -40 to 70 °C for storage. The operating upper limit of 50 degrees C is the number that matters in the Gulf: a board in an unconditioned plant room or on an exposed wall can exceed it in summer, and a fully loaded row of 20 A devices adds its own heat. If the board is expected to be hotter, derate the switch or provide ventilation or cooling for the enclosure.

The package data in the datasheet gives a single unit weight of 44 g in its package, which also reflects how light the device is; the contractual warranty entry is 18 months. Neither number replaces the design check of current, voltage and duty.

Selection checklist for the A9E18070

• Voltage and current: 250 V AC, 20 A maximum, and the AC-22 duty at power factor 0.8.
• Function: manual two-position selector or on/off; it is not an automatic or remote device.
• Poles: this reference has one pole and one changeover contact, so neutral is not switched unless a second device is used.
• Space: two 9 mm pitches, 75 mm depth.
• Marking: the 0-1 marking on the front; confirm it suits the labelling of the board.
• Environment: IP20 inside a closed enclosure, ambient limits as given.

Applications of the A9E18070 in Oman and the GCC

In Gulf villas, mosques, schools and small commercial buildings the board often needs a manual selector for lighting, outdoor circuits or small pumps that is simple enough for a caretaker to use. The 0-1 lever and the visible position make it a good fit for this kind of user, who does not want to open a circuit breaker to switch a service off for cleaning.

In industrial and utility rooms it is also used as a local isolation point for auxiliary circuits such as space heaters, panel lamps and socket circuits inside cabinets, where the rated 20 A gives a margin over the normal load. A changeover version is used to select between a normal supply and a stand-by supply on a small circuit, with the usual rule that only one source may be connected at a time.

Information to send with an RFQ for the A9E18070

• Reference (A9E18070) and quantity
• Circuit voltage and load type, resistive or inductive
• Whether on/off or changeover duty is needed
• Board space and door clearance, including depth
• Delivery location and timing

Documents and quotation

A datasheet for the A9E18070 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.