Schneider Electric A9C30812 iTL 2NO 16 A Impulse Relay

A9C30812: two-pole mains-coil impulse relay with phase and neutral break

The A9C30812 is a Schneider Electric Acti9 product listed in the datasheet as: impulse relay iTL – 2P – 2 NO – 16A – coil 110 VDC – 230 to 240 VAC 50/60Hz. The A9C30812 doubles the pole count of the A9C30811 in the same 18 mm width: two normally open 16 A contacts, a 230 to 240 V AC or 110 V DC coil, and the same pulse-and-latch operation. It is chosen when both conductors of a lighting or small-load circuit must be opened. Seven Star LLC supplies the A9C30812 in Oman and the GCC as an independent supplier based in Muscat.

From the datasheet title: iTL, 2P and 2 NO, 16 A, and a coil of 110 V DC or 230 to 240 V AC 50/60 Hz. The operational voltage is 250 V AC. Compared with the 24 V DC / 48 V AC version A9C30212 the only change is the coil.

Technical specifications of the A9C30812

How the A9C30812 works

Think of the relay as a memory with one input. Each press of any connected push-button adds one pulse, and the contact changes state with every pulse. Any number of push-buttons can be wired in parallel, so a corridor with six doors needs six buttons and one relay. The trade-off is that the relay only knows ‘toggle’, so the state of the circuit after a power cut or a lost pulse should be verified when a scheme depends on it.

A pulse closes both contacts together; the next pulse opens them. The two poles share a mechanism, so there is no phase difference between them. Contacts are rated for AC-21 at 200,000 cycles and AC-22 at 100,000 cycles in the datasheet, which tells us that purely resistive switching lasts longer than mixed resistive and inductive switching.

Control and contact data of the A9C30812

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: 5 switching operations/minute; 100 switching operations/day. 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 A9C30812

The A9C30811 differs in poles 1P against 2P here; contacts 1 NO against 2 NO here. The A9C30814 differs in poles 4P against 2P here; contacts 4 NO against 2 NO here; width 36 mm against 18 mm 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 A9C30812

• Choose this reference when the neutral must be broken together with the phase.
• Check LED or electronic ballast inrush on the contact.
• 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 A9C30812

Test a new installation by pressing each button station in turn and watching the ON/OFF indicator on the relay. A relay that toggles twice per press usually has an illuminated button leaking current or a bouncing contact; a relay that does not respond usually has a wrong coil voltage or an open neutral. Work with the supply isolated while wiring and record button positions on the board label for later maintenance.

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 A9C30812 is used in Oman and the GCC

A common application is hotel and residential lighting where a full break is required, as well as the switching of small heating, bell or fan circuits from several buttons. In Omani offices the relay is used for corridor and meeting-room lighting controlled from multiple points.

Lighting with electronic drivers or LED lamps can produce high short-lived inrush currents. If a long group of LED fittings is on one contact, check the manufacturer’s inrush data against the contact; an oversized group can shorten contact life even if the 16 A steady current is respected.

Information to send with an RFQ for the A9C30812

• Full reference (A9C30812) 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 A9C30812 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.