Schneider A9C30812 Impulse Relay — Specs, Selection & Install

By Abdullah Zahid
14 min read
Schneider Electric A9C30812 iTL 2P 16A modular impulse relay on Acti9 DIN rail for lighting control panel

Schneider Electric A9C30812 Impulse Relay iTL - 2P - 2 NO - 16A - Coil 110 VDC - 230-240 VAC 50/60Hz: Specifications, Selection, and Installation

When an electrical contractor or controls engineer searches for the Schneider Electric A9C30812 impulse relay, they are typically at the final verification stage — coil voltage confirmed, load current calculated, panel space measured — and they need one authoritative source to validate the choice before placing the order. The A9C30812 is a 2-pole, 2 normally open contact modular impulse relay rated for 16A switching across a 24VAC to 250VAC operating range, with coil options of 110 VDC or 230-240 VAC 50/60Hz. It belongs to the Acti9 platform — a clip-on DIN-rail modular family — and carries EN 669-2-2 and EN 669-1 compliance, making it a preferred choice for commercial lighting control and building automation systems requiring verified international standards acceptance.

If you have already confirmed this is the correct part, check current pricing and availability for the A9C30812 at LeadTime.ca — ships worldwide.

Who Should Buy the A9C30812 — and Who Shouldn't

The A9C30812 is the right relay when your application meets all of the following criteria:

  • Your control circuit operates at exactly 110 VDC or 230-240 VAC 50/60Hz — the only two coil voltage options available on this model
  • Your total switched load current does not exceed 16A continuous across both poles
  • Your load operates within the 24VAC to 250VAC switching voltage range
  • Your panel is built on Acti9 modular DIN-rail architecture with space available for the clip-on form factor
  • Your control logic requires 2 normally open (NO) contacts that close on pulse receipt and latch in position
  • Your installation requires EN 669-2-2 or EN 669-1 compliance — common in EU and internationally regulated lighting control projects

If your total load current exceeds 16A, the A9C30816 is the correct next step. If you need normally closed contacts or a different pole configuration, a different iTL family variant is required. If your coil supply does not match either available voltage option, do not order this model — contact a specialist distributor to identify the correct SKU before committing.

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What the A9C30812 Actually Does in a Control Circuit

The Schneider Electric A9C30812 is an electromechanical impulse relay — not a standard contactor, not a standard relay. The distinction matters operationally. A conventional relay requires continuous coil energization to hold its contacts in position. The A9C30812 operates on pulse logic: a single short pulse to the coil toggles the contact state, and the relay mechanically latches in that position until the next pulse reverses it. No continuous power draw is required to maintain contact position.

This latching behavior makes the A9C30812 the correct device for push-button lighting control, timer-coordinated switching circuits, and any application where you want the relay to hold state through a power interruption or across long intervals without continuous coil energization. The 2P (2-pole) configuration means both poles switch simultaneously from a single coil pulse. Both contacts are normally open, meaning the circuit downstream is open at rest and closes when the relay is pulsed into the energized state.

EN 669-2-2 certification confirms this relay meets the international impulse relay standard — it is not simply marketed as a latching relay but is formally certified to the specification that governs impulse relay function in lighting and control systems. The EN 669-1 compliance additionally verifies baseline safety and performance requirements. Weighing 0.11kg and using a clip-on spring mount, the A9C30812 installs without tools directly onto a standard Acti9 DIN-rail assembly, integrating physically and functionally with other Acti9 modular components on the same rail.

Typical System Architecture: Where the A9C30812 Sits in the Signal Chain

The A9C30812 operates as the electromechanical switching node between a pulse-generating control source and the downstream electrical load. It sits mid-chain: receiving a momentary pulse from above and delivering switched power to loads below.

  • Control power source (110 VDC supply or 230-240 VAC panel) feeds the relay coil circuit
  • Pulse-generating device (push-button, timer output, automation contact output, or occupancy sensor relay) sends momentary signal to the A9C30812 coil terminals
  • A9C30812 relay latches open or closed on each received pulse, maintaining contact state without continuous signal
  • Two normally open load contact pairs (2P / 2NO) switch downstream loads operating at 24VAC to 250VAC
  • Downstream loads (lighting circuits, HVAC zone contactors, fan starters, or auxiliary control relays) receive or lose power based on relay latch state

Typical Applications for the Schneider A9C30812 Impulse Relay

Commercial lighting control is the primary home for the A9C30812. Multi-zone office, retail, or hospitality lighting systems use impulse relays to allow a single push-button to cycle through preset scene states with latching behavior — the light circuit stays in its new state without anyone holding the button. The EN 669-2-2 certification is specifically relevant here, as regulated lighting control specifications in the EU and in internationally aligned building codes frequently require certified impulse relays rather than general-purpose contactors.

Stairwell and corridor lighting circuits with time-delay coordination use the A9C30812 in conjunction with secondary timers: the impulse relay holds the circuit active while the timer runs, then a reset pulse from the timer de-energizes the circuit. This reduces standby energy consumption versus always-on wiring while avoiding the complexity of more expensive automation modules.

HVAC zone switching is another natural fit. The A9C30812 can alternate between two HVAC zones or fan speed taps on a periodic pulse command from a building management system contact output. Because the relay latches, the zone selection persists through brief BMS communication interruptions without reverting to default state.

Industrial machine control panels use the A9C30812 where latching start/stop logic is needed in safety-interlocked circuits and where the compact Acti9 footprint reduces overall panel depth compared to a contactor plus auxiliary holding circuit approach. Emergency lighting system control — where a pulse from a fire panel or timer triggers a state change that must persist — is another documented use case for this relay class.

Application Typical Deployment
Multi-zone commercial lighting Push-button scenes in offices, retail, hospitality — pulse latches relay per zone
Stairwell / corridor lighting Paired with timer relay; A9C30812 holds circuit, timer sends reset pulse
HVAC zone or fan speed switching BMS contact output sends pulse to alternate between zones or speed taps
Emergency lighting control Fire panel or occupancy sensor pulse triggers persistent relay state change
Industrial machine start/stop Safety-interlocked panel using Acti9 modular rail; compact latching logic without holding circuit wiring

A9C30812 Key Specifications: What Engineers Need for a Purchase Decision

Parameter Value Notes
Contact Configuration 2P / 2 Normally Open (2 NO) NO contacts close on pulse; no NC option on this model
Rated Switching Current 16A Maximum continuous; do not exceed across both poles
Operating Voltage (Load) 24VAC to 250VAC Covers 24V, 110V, 230VAC standard ranges
Coil Voltage Option 1 110 VDC Observe polarity on DC coil connection
Coil Voltage Option 2 230-240 VAC 50/60Hz Specify site frequency at order — not auto-sensing
Relay Operation Type Impulse (pulse-driven latching) Holds state without continuous coil energization
Form Factor Modular DIN-rail clip-on (Acti9) Tool-less spring clip; no fasteners required
Weight 0.11 kg Standard Acti9 modular footprint
Standards Compliance EN 669-2-2, EN 669-1 Impulse relay and general requirements certification
Platform Family Acti9 (Schneider Electric modular) Compatible with Acti9 rail and adjacent modular components

Full technical specifications are available on the product page at LeadTime.ca.

A9C30812 vs A9C30816 and Other Alternatives: Which One Do You Actually Need?

Criterion A9C30812 (Schneider iTL) A9C30816 (Higher Current) Latching Contactor Solid-State Relay
Contact Rating 16A @ 24-250VAC 20A @ 24-250VAC 25A+ typical 16-40A typical
Pole / Contact Config 2P / 2NO fixed 2P / 2NO fixed 2-3P / mixed configs Software-configurable
Coil Voltage Options 110 VDC, 230-240 VAC 110 VDC, 230-240 VAC Many (24VDC to 480VAC) 12-24VDC typical
Modular DIN-Rail Clip-On Yes (Acti9 standard) Yes (Acti9 standard) No (screw terminals typical) Yes (common)
Pulse-Driven Latching Yes (built-in) Yes (built-in) No (requires holding circuit) Yes (software-controlled)
EN 669 Compliance Yes (EN 669-2-2, EN 669-1) Yes (Acti9 family) Not applicable Not applicable
Panel Space Minimal (compact modular) Minimal (compact modular) Large (contactor body + auxiliaries) Minimal
Best For Lighting scenes, compact panels, EN 669-regulated circuits Higher current lighting or automation up to 20A Very high current industrial motors Precision pulse timing, zero-crossing switching
When NOT Suitable Above 16A loads; NC contacts needed; coil voltage mismatch Above 20A loads Compact panels; precision timing applications Very high current; non-electronic environments

If your total switched load current exceeds 16A, the A9C30816 is the correct selection — same Acti9 modular form factor, same coil voltage options, rated for 20A. Check current availability and confirm the right variant at LeadTime.ca before placing your order.

Expert Verdict: Is the A9C30812 the Right Relay for Your Project?

The A9C30812 earns its place in commercial lighting and building automation control panels by doing something that sounds simple but is frequently mis-engineered: delivering reliable, tool-less, standards-certified pulse-latching control in a format that integrates directly with the rest of a modular Acti9 switchboard. The 2P/2NO configuration and 16A capacity cover the majority of commercial lighting zone circuits, the 24VAC to 250VAC operating range handles virtually every standard load voltage, and the EN 669-2-2 certification removes the compliance question entirely for regulated installations. At 0.11kg with clip-on mounting, it goes into a panel faster and takes up less rail space than a contactor-based latching alternative that would require additional auxiliary contacts and a holding circuit. The right buyer is a building automation contractor, facilities engineer, or panel builder working with Acti9 platform components and needing an internationally compliant impulse relay that their technicians can install and replace without specialist tooling.

The A9C30812 has real limits that are worth stating plainly. If your switching load exceeds 16A, this relay is the wrong part — specify the A9C30816 instead, which offers 20A capacity in the identical Acti9 form factor. If your control logic requires normally closed contacts, this model cannot be made to work in that role: the 2NO contact configuration is fixed, and no wiring workaround substitutes for selecting a different iTL family variant. Applications requiring DC switching above 110V, very high-frequency pulse cycling, or precision zero-crossing timing are better served by solid-state alternatives. And in installations that are not built around the Acti9 modular DIN-rail platform, the premium for the modular clip-on design may not be justified compared to a conventional DIN-rail relay with screw terminals.

From a procurement standpoint, the A9C30812 is a standard Acti9 catalog item available through authorized distributors worldwide, with in-stock availability typical at major industrial electrical supply channels and lead times extending to 2-4 weeks in special-order or region-restricted scenarios. The single most important thing to verify before ordering is coil voltage — confirm on-site control power with a meter and specify the coil option explicitly in writing. Ordering the wrong coil voltage (110 VDC when the panel is 230VAC, or vice versa) is the leading cause of returns and project delays on this relay class. Buying through a specialist distributor who verifies coil voltage against your panel schedule before shipping, and who can bundle the A9C30812 with other Acti9 components at volume pricing, reduces that risk considerably. View current pricing and availability for the A9C30812 at LeadTime.ca — we ship worldwide.

For volume pricing, lead time confirmation before committing a project timeline, or technical verification of coil voltage compatibility, contact the LeadTime.ca team directly — we source and ship Acti9 platform components globally.

What Engineers Need to Know Before Ordering the A9C30812

Because public forum discussions on the A9C30812 are sparse — this is a specialist industrial relay used primarily by professionals who consult manufacturer datasheets and distributor technical support rather than general automation forums — the most useful pre-order intelligence comes from documented ordering patterns and engineering practice. The following covers the critical knowledge gaps that experienced buyers and distributors have identified when working with this relay family.

The coil voltage specification is where the most costly errors occur. The A9C30812 offers two distinct coil options: 110 VDC and 230-240 VAC 50/60Hz. These are not interchangeable and the model number alone does not always make the coil voltage immediately obvious to someone reading a purchase order quickly. Buyers who order from a procurement list without physically measuring the control power at the panel — or without explicitly confirming the coil voltage in the order — risk receiving a relay that cannot be energized from their available supply. The fix is straightforward: measure control voltage before specifying, and include the coil voltage explicitly in the PO description, not just the catalog number.

Contact configuration is the second area where misspecification happens most predictably. The A9C30812 provides 2 normally open contacts, which close when the relay is pulsed into the energized position and latch there. Engineers who need de-energizing behavior (a contact that is closed at rest and opens on pulse command) sometimes select this model based on the 2P 16A rating alone without registering the NO-only contact specification. Mapping the required circuit behavior on paper before ordering — specifically identifying whether the relay needs to complete or interrupt a circuit on pulse receipt — eliminates this mistake before it reaches the bench.

The Acti9 platform integration point is worth raising for engineers who are retrofitting into an existing panel rather than building from scratch. The clip-on modular mounting is designed for Acti9 DIN-rail assemblies. If the existing panel uses a different modular rail system or relies on screw-terminal fixed relays, verify physical compatibility before assuming the A9C30812 will drop in directly. In retrofit scenarios, contacting a specialist distributor for a pre-order compatibility check is faster and cheaper than discovering a mounting incompatibility on-site.

Wiring and Installation Overview

The following points summarize the key considerations for installing the A9C30812. For full step-by-step wiring procedures and terminal diagrams, refer to the Schneider Electric installation documentation and the technical datasheet available from your distributor.

  • De-energize and lock out the panel before mounting the relay; verify zero voltage at control and load terminals with a non-contact tester before handling
  • Clip the A9C30812 onto the Acti9 DIN-rail at the intended location and press firmly until fully seated — no fasteners are required, but confirm the module does not rock side-to-side before connecting wires
  • Connect control power (110 VDC or 230-240 VAC 50/60Hz) to the coil terminals as marked on the relay body; if using 110 VDC, observe polarity — positive terminal to positive supply
  • Connect load switching wires to the normally open contact terminals; confirm terminal labeling against the datasheet for your specific unit before final termination
  • After restoration of control power, verify relay latches correctly on a test pulse before connecting full load — listen for the mechanical click and measure continuity across contact terminals to confirm state change

Wrong-Part Prevention: Verify These Before You Order

The following checklist must be completed before placing an order for the A9C30812. Do not rely on part number alone — verify each point against your specific installation:

  1. Verify control circuit coil voltage exactly matches 110 VDC or 230-240 VAC 50/60Hz (not 24VAC, not 380VAC)
  2. Confirm load switching current does not exceed 16A rated capacity
  3. Check operating voltage of controlled load is 24VAC to 250VAC range
  4. Verify DIN-rail mounting location has clip-on compatible board (Acti9 modular rail)
  5. Confirm pole count (2P) and normally open contact configuration (2 NO) matches control logic
  6. Ensure 230-240VAC coil option matches site frequency (50Hz or 60Hz as required)
  7. Verify no legacy panel uses older iTL models with different connector interface
  8. Confirm no confusion between impulse relay (this unit) and traditional latching contactors or instant-on relays

If any item on this checklist cannot be confirmed before ordering, contact the LeadTime.ca team for pre-order technical verification — our team can cross-reference your panel schedule and confirm the correct model before shipment.

Frequently Asked Questions

Can the A9C30812 directly control an 18A lighting circuit if I derate slightly?

No. The 16A rated switching current is a hard maximum for continuous load — operating above this rating causes contact arcing, intermittent failures, and accelerated contact wear that may not be immediately visible but will cause premature relay failure. If your total switched load exceeds 16A, specify the A9C30816, which is rated for 20A in the same Acti9 modular form factor with identical coil voltage options.

What happens if I apply 230VAC to a relay ordered with a 110 VDC coil?

The relay will not operate correctly and the coil may be damaged or destroyed. The two coil options — 110 VDC and 230-240 VAC 50/60Hz — are not interchangeable. Always measure and document your site control voltage with a multimeter before specifying the coil option, and confirm the coil voltage in writing on the purchase order.

Is the A9C30812 compatible with BACnet or Modbus building automation systems?

Not natively. The A9C30812 is a hardwired electromechanical impulse relay with no digital communication capability. It can be integrated into smart building systems by using it as a pilot relay controlled by a BMS contact output or a pulse-generating automation interface. For direct digital protocol control, a different device or an intermediate digital output module is required.

Can this relay be used in an outdoor or wet environment without a panel?

No. The A9C30812 is designed for modular DIN-rail installation inside a climate-controlled panel. For outdoor or harsh environment installations, the relay must be housed in an appropriately rated enclosure with protection against moisture, dust, and temperature extremes. The relay itself does not carry an outdoor or environmental ingress rating for unprotected use.

Is the A9C30812 a direct replacement for older iTL impulse relay models in an existing panel?

Verify the connector interface and terminal layout before assuming direct drop-in compatibility. Schneider Electric has evolved the Acti9 and iTL product family over time, and older panel installations may use a different connector or rail interface. If replacing a legacy unit, provide the old model number to your distributor and request a confirmed compatibility check rather than assuming physical similarity indicates electrical equivalence.

Does the relay require any periodic maintenance or calibration?

No periodic maintenance or calibration is required under normal installation conditions. For high-switch-count circuits — applications where the relay is toggled many times per day — a visual inspection of the contacts every few years is reasonable practice. If contacts show visible arcing marks or pitting, or if the relay fails to latch reliably, replacement is the correct action rather than adjustment or cleaning.

Why Order the A9C30812 Through LeadTime.ca

  • LeadTime.ca stocks and sources Acti9 platform components for global shipment — not limited to any single region or country
  • Pre-order technical verification available: confirm coil voltage, contact configuration, and mounting compatibility before the order ships
  • Volume pricing on Acti9 modular components — A9C30812 can be bundled with breakers, surge suppression, and other modular control devices on a single order
  • Specialist distributor support for controls engineers and procurement specialists — faster resolution if a specification question arises than a generic online retailer

At-a-Glance Summary

  • Model: Schneider Electric A9C30812 — Impulse relay iTL, 2P, 2 NO, 16A, coil 110 VDC or 230-240 VAC 50/60Hz
  • Contact configuration: 2 normally open (NO) contacts — closes on pulse; no NC option on this model
  • Rated switching current: 16A maximum continuous; specify A9C30816 for loads up to 20A
  • Load operating voltage range: 24VAC to 250VAC — covers 24V, 110V, and 230VAC standard circuits
  • Coil voltage options: 110 VDC (observe polarity) or 230-240 VAC 50/60Hz — verify on-site supply before ordering
  • Form factor: Acti9 modular DIN-rail clip-on, 0.11kg, tool-less installation
  • Standards: EN 669-2-2 (impulse relay) and EN 669-1 (general requirements) certified
  • Primary use: Commercial lighting zone control, HVAC zone switching, emergency system pulse inputs, industrial latching start/stop logic
  • Key ordering risk: Coil voltage mismatch — measure and document site control voltage before specifying
  • Available worldwide through LeadTime.ca — check current availability here

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