Schneider Electric A9C30811 iTL 1NO 16 A Impulse Relay

A9C30811: single-pole mains-coil impulse relay for stair and corridor lighting

The A9C30811 is a Schneider Electric Acti9 product listed in the datasheet as: impulse relay iTL – 1P – 1NO – 16A – coil 110 VDC – 230 to 240 VAC 50/60Hz. The A9C30811 is the mains-coil version of the single-pole iTL: a normally open 16 A contact that toggles on every pulse, with a coil that accepts 230 to 240 V AC at 50/60 Hz or 110 V DC. The push-buttons therefore work at mains level, which keeps wiring simple in standard buildings. Seven Star LLC supplies the A9C30811 in Oman and the GCC as an independent supplier based in Muscat.

The title gives iTL, 1P and 1 NO, 16 A, and a coil of 110 V DC or 230 to 240 V AC 50/60 Hz. The datasheet gives the same 250 V AC operational voltage and the same 16 A rating as the other single-pole references, so the product differs only in the coil.

Technical specifications of the A9C30811

How the A9C30811 works

An impulse relay stores its state mechanically. A short pulse on the coil moves the contact, a permanent-magnet and latch arrangement holds it there, and the coil is then de-energised. The next pulse moves the contact back. Because there is no holding current, the relay does not heat up, makes no hum after switching and costs nothing to keep on, which is why it replaced the older arrangement of a contactor with a held-in coil for staircase and corridor lighting.

Each pulse of 50 ms to 1 s toggles the contact and the relay stays in the new position without coil current. The datasheet lists remote and manual control and coil deconnection, plus a 3 mA allowance for illuminated push-buttons. With a mains coil a neutral wire must be present at each button position if the button has a lamp, so that point should be planned at design stage.

Control and contact data of the A9C30811

Coil voltage: 230 to 240 V AC 50/60 Hz; 110 V DC. Rated operational voltage: 250 V AC 50/60 Hz. Rated current: 16 A. Control type: Remote and manual control; Coil deconnection. Impulse duration: 50 ms–1 s. Switching frequency: 100 switching operations/day; 5 switching operations/minute. Remote control type: Illuminated push-button 3 mA. Electrical durability: AC-21: 200000 cycles; AC-22: 100000 cycles.

AC-21 and AC-22 are the load categories of IEC 60947: AC-21 refers to resistive loads including moderate overloads and AC-22 to mixed resistive and inductive loads. The higher cycle count for AC-21 shows that purely resistive circuits give the longer contact life.

Range and accessories around the A9C30811

The A9C30212 differs in poles 2P against 1P here; contacts 2 NO against 1 NO here; coil 48 V AC 50/60 Hz against 230 to 240 V AC 50/60 Hz here. The A9C30812 differs in poles 2P against 1P here; contacts 2 NO against 1 NO here.

The datasheet lists compatible accessories and range members for this reference: Acti9 iATEt; Acti9 iATL4; Acti9 iATLc; Acti9 iATLc+s; Acti9 iATLm; Acti9 iATLs; Acti9 iATLz; Acti9 iETL iTL 16; Acti9 iATLc+c; Acti9 iATL24. The comparison table lists the impulse relays of this group.

Selection checklist for the A9C30811

• Confirm 230 to 240 V AC (or 110 V DC) at the buttons.
• Count illuminated buttons; the datasheet allows 3 mA in total.
• Check the pulse source: a push-button or a controller output that delivers a pulse of 50 ms to 1 s.
• Check the width of 18 mm (2 pitches) against free space on the rail.
• Check load type against AC-21 and AC-22 data, including inrush of LED or electronic loads.

Installation and maintenance of the A9C30811

Fit the relay on a 35 mm DIN rail and wire the coil to terminals A1 and A2 and the contacts to the numbered terminals shown on the front. The datasheet gives a 1 N.m tightening torque, an 11 mm strip length and tunnel terminals accepting 0.5 to 4 mm squared on the control side. For button lines longer than a few tens of metres, check capacitive coupling, because a long cable beside mains conductors can feed enough current through an illuminated button to keep the coil half-energised.

Environmental data from the datasheet: -20 to 50 °C in operation, -40 to 70 °C in storage, relative humidity 95 % at 55 °C.

Where the A9C30811 is used in Oman and the GCC

This is the reference most associated with standard residential wiring in countries using 230 V: staircase lights, corridor lighting and hallway circuits where several buttons act on one lamp group. In Gulf apartment buildings the same circuit is repeated on each floor, which makes a common stock item useful.

With a mains coil, glow-lamp push-buttons draw a small current through the coil even when the button is open; the datasheet limit is 3 mA. If a long cable run is used, capacitance can raise this current, and the relay may chatter or pull in unintentionally. A shorter run or a different button prevents the effect.

Information to send with an RFQ for the A9C30811

• Full reference (A9C30811) 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
• Number of push-button stations and whether they are illuminated

Documents and quotation

A datasheet for the A9C30811 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.