Schneider Electric A9C30111 iTL 1NO 16 A Impulse Relay

A9C30111: single-pole impulse relay with a low-voltage 12 V DC / 24 V AC coil

The A9C30111 is a Schneider Electric Acti9 product listed in the datasheet as: impulse relay iTL – 1P – 1NO – 16A – coil 12 VDC – 24 VAC 50/60Hz. The A9C30111 is a latching impulse relay: one short pulse on the coil closes its single normally open contact and the next pulse opens it again. Because the contact stays in position without current in the coil, a lighting circuit can be switched from any number of push-buttons without a standing coil load. Seven Star LLC supplies the A9C30111 in Oman and the GCC as an independent supplier based in Muscat.

Reading the datasheet title: iTL is the Acti9 impulse relay, 1P and 1 NO describe one pole with one normally open contact, 16 A is the contact rating, and the coil takes either 12 V DC or 24 V AC at 50/60 Hz. The datasheet gives a rated operational voltage of 250 V AC, so the pulse side and the switched side are separated: a safe low voltage on the buttons, mains on the load.

Technical specifications of the A9C30111

How the A9C30111 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.

A control pulse between 50 ms and 1 s is accepted. Each pulse toggles the contact, so the relay behaves like a memory element. The datasheet also lists coil disconnection and manual control: a front lever allows the contact to be forced by hand and the coil to be switched out of service during maintenance, and an ON/OFF indicator shows the state without a meter.

Control and contact data of the A9C30111

Coil voltage: 24 V AC 50/60 Hz; 12 V DC. Rated operational voltage: 250 V AC 50/60 Hz. Rated current: 16 A. Control type: Coil deconnection; Remote and manual control. 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 A9C30111

The A9C30115 differs in poles 2P against 1P here; contacts 1 NO + 1 NC against 1 NO here. The A9C30212 differs in poles 2P against 1P here; contacts 2 NO against 1 NO here; coil 48 V AC 50/60 Hz against 24 V AC 50/60 Hz here.

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

Selection checklist for the A9C30111

• Match coil voltage and type: this reference accepts 12 V DC or 24 V AC 50/60 Hz, not mains.
• Count the push-buttons: the datasheet lists illuminated buttons up to 3 mA of glow current.
• 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 A9C30111

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 A9C30111 is used in Oman and the GCC

The 12 V DC / 24 V AC coil is chosen where button wiring must be extra-low voltage, for example in corridors, stairwells and offices fed from a bell transformer, or where a building uses a 12 V or 24 V control bus. In Oman villas and apartment blocks it is a typical solution for switching stair or corridor lights from several floors.

Keep the pulse to the coil within the 50 ms to 1 s window. A button held longer than a second, or a very short electronic output, can give erratic switching; a push-button with a neon lamp is allowed up to the 3 mA figure for an illuminated button listed in the datasheet, and a larger glow current may keep the coil partly energised.

Information to send with an RFQ for the A9C30111

• Full reference (A9C30111) 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 A9C30111 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.