What does IEC 60669-2-2 actually require for impulse relays? IEC 60669-2-2 is the particular standard for electromagnetic remote-control switches used in household and similar fixed installations, and it covers the device family that includes the impulse relay: rated voltage and current, contact utilisation categories, temperature rise limits, dielectric strength, and mechanical and electrical endurance under repeated switching. It sits alongside the general switch standard IEC 60669-1 and is distinct from the relay standards (IEC 61810) and industrial control-circuit device standards (IEC 60947-5-1) that panel builders also encounter on the same shelf. Knowing which standard a datasheet is quoting tells you what was actually tested — and, just as importantly, what was not.
Why Impulse Relays Have Their Own Standard
An impulse relay is not a general-purpose relay in the IEC 61810 sense, and it is not an industrial contactor covered by IEC 60947-4-1. It is a switching device intended to be installed in a distribution board and operated directly by building occupants through push-buttons wired to household or similar fixed installations. That context — non-specialist users, momentary control pulses, decades of unattended service inside a consumer unit — is why the IEC 60669 series exists as a dedicated family for switches and remote-control switches in fixed wiring, rather than leaving impulse relays to be certified against a generic relay or contactor standard.
IEC 60669-2-2 is the particular requirements part for electromagnetic remote-control switches within that series. It builds on the general requirements in IEC 60669-1 and adds the tests that matter specifically for a device that latches on a pulse and holds its state without continuous coil energisation. A datasheet that references IEC 60669-2-2 is telling you the device has been tested as a remote-control switch for fixed household-type installations — not as a machinery control relay.
Electromagnetic Remote-Control Switch (RCS)
The IEC 60669-2-2 term for what the market calls an impulse relay, latching relay or telerupteur: a switching device operated by a momentary electrical control signal (usually from a push-button) rather than by direct manual actuation of the switch contacts themselves.
How It Differs from IEC 61810 and IEC 60947-5-1
Confusion here is common because all three standards can appear on components that look similar on a DIN rail. IEC 61810 covers electromechanical elementary relays as a general product family — plug-in relays, PCB relays, general control relays — without assuming a specific installation context. IEC 60947-5-1 covers control circuit devices and switching elements for industrial applications, the standard behind auxiliary contactors, control relays and many of the interface devices used in machine panels. IEC 60669-2-2 is narrower and more specific: it applies to remote-control switches intended for fixed electrical installations in buildings, which is exactly where an impulse relay lives.
A manufacturer sometimes tests the same physical device against more than one standard if it is sold into more than one market segment, but for a device marketed as an impulse relay for lighting control, IEC 60669-2-2 is the standard that actually governs the intended use. When a datasheet quotes a different standard for a device sold as an impulse relay, that is worth a second look before specifying it.
| Standard | Scope | Typical device |
|---|---|---|
| IEC 60669-2-2 | Electromagnetic remote-control switches in fixed household/similar installations | Impulse relay / telerupteur |
| IEC 61810 | Electromechanical elementary relays, general product family | Plug-in and PCB control relays |
| IEC 60947-5-1 | Control circuit devices and switching elements for industrial applications | Auxiliary contactors, interface relays, industrial pilot devices |
Related reading covers the same distinction from the general side of the range in the Impulse and Latching Relay Engineering Guide, which is worth reading first if the family terminology (impulse relay, latching relay, bistable relay) is still unfamiliar.
Rated Voltage, Current and Utilisation Categories
IEC 60669-2-2 defines the rated operational voltage and current the device is tested at, and — critically for lighting applications — the utilisation categories the contacts are qualified for. Utilisation category is not a single number; it describes a type of load and how hard it is on a contact. AC-1 covers non-inductive or slightly inductive loads (resistive-type). AC-5a covers discharge lamp control, where inrush at switch-on is significant. AC-5b covers incandescent lamp control, where the cold-filament inrush is the defining stress. None of these three categories was written with LED drivers in mind, because the standard predates LED lighting becoming dominant — which is the single most important gap discussed further down this page.
Key takeaway: A utilisation category tells you what kind of load the contact was tested against, not a single current figure. Matching the category to the actual load type is part of correct selection, not an optional refinement.
The full breakdown of AC-1, AC-5a and AC-5b and how to read them off a datasheet is covered separately in Impulse Relay Contact Ratings and Utilisation Categories.
Mechanical and Electrical Endurance Under the Standard
Because an impulse relay in a corridor or stairwell circuit can be operated many times daily for years without maintenance, endurance testing is a core part of IEC 60669-2-2 qualification. The standard requires the device to withstand a defined program of no-load mechanical cycling and on-load electrical cycling at rated values, then verification that contacts still make and break correctly and insulation and temperature-rise limits still hold. Manufacturers typically publish their own endurance figures as evidence of margin above the minimum, but exact cycle counts vary by range and rating and should be read from the specific product's documentation rather than assumed.
This is where mechanical ratchet devices and electronic latching devices diverge in practical behaviour even though both can be certified against the same standard. A mechanical ratchet relies on a physical index mechanism that wears with use; an electronic latching type replaces some of that mechanical wear with solid-state switching logic, at the cost of being more sensitive to noise on long control-wire runs. Both are covered by the standard's general endurance framework, but the failure modes at end of life look different on the bench.
Electrical Endurance Test
A standardised test sequence in which the switching device is cycled on and off under load at its rated current and voltage for a defined number of operations, after which contact resistance, temperature rise and insulation are re-checked to confirm the device still meets its rated performance.
Temperature Rise and Dielectric Strength
Alongside endurance, IEC 60669-2-2 sets temperature-rise limits at the terminals and enclosure under rated load, and dielectric strength requirements between live parts, between poles, and to earth. These are the tests that catch an undersized contact or an inadequate creepage distance before it becomes a field failure — a relay that runs warm to the touch under normal load, or one where insulation degrades faster than expected in a humid plant room, usually traces back to a margin that was tight from the start rather than a defect that developed later.
Key takeaway: Temperature-rise and dielectric tests in IEC 60669-2-2 are about margin, not pass/fail on day one. A device that just scrapes through at the test bench has less headroom in a hot, crowded distribution board than one with real margin above the limit.
What the Standard Does Not Solve: LED Inrush
This is the gap that causes the most field trouble, and it is worth stating plainly: IEC 60669-2-2's utilisation categories were defined around resistive, discharge and incandescent loads, not the capacitive inrush behaviour of modern LED drivers. A relay that is correctly certified against the standard, with a nameplate AC-1 current that looks generous for the connected load, can still weld its contacts on an LED lighting circuit because the standard's rated current figure does not describe the very short, very high capacitive inrush pulse an LED driver draws at every switch-on.
Manufacturers address this gap outside the standard's own figures, publishing lamp-count or capacitive-load tables per relay rating — a separate document from the nameplate AC-1 rating, and the one that actually governs how many LED fittings a pole can safely control. A corridor circuit that grew from a handful of LED downlights to several dozen over a few retrofit projects is a common way this gets missed: correctly sized originally, never re-checked against the lamp table afterward.
N ≤ I_C / I_LED
Where: N = maximum number of LED fittings safely controlled by one pole; I_C = the relay's rated capacitive-load current from the manufacturer's lamp-load table (not the AC-1 nameplate figure); I_LED = the declared inrush or steady-state current per fitting from the luminaire or driver datasheet.
The full derating logic and worked reasoning behind this calculation is covered in LED Inrush Current and Impulse Relay Derating, and the coil-side half of correct selection — matching control voltage to the building's push-button wiring — is covered in Impulse Relay Coil Voltage and Control Circuit Design.
Key takeaway: Standard compliance and correct application sizing are two different checks. A device can pass every IEC 60669-2-2 test and still be the wrong choice for a specific LED load if the lamp-load table was never consulted.
Reading a Datasheet Against the Standard
In practice, the standard reference on a datasheet is a starting filter, not the whole selection process. Confirm the device is qualified under IEC 60669-2-2 for the intended fixed-installation use, then read past that line to the rated voltage and current, the utilisation categories actually listed, the coil voltage needed for the building's push-button circuit, and — for any LED-heavy circuit — the separate lamp-load table. Modular ranges such as the Acti9 iTL family from Schneider Electric — for example a 16 A single-pole iTL — and the E290 range from ABB, including 32 A two-pole E290 units for heavier lighting circuits, publish this per rating and pole count, and both sit inside their modular ecosystems so they line up with the MCBs and RCCBs already on the board. The full relay collection at Stoklink carries both ranges across the pole counts commonly specified for corridor, stairwell and open-plan lighting circuits.
Frequently Asked Questions
Is IEC 60669-2-2 the correct standard for an impulse relay?
Yes, for the impulse relay/telerupteur/electromagnetic remote-control switch device family used in household and similar fixed installations. It is a particular requirements part sitting under the general switch standard IEC 60669-1. Industrial control relays and general-purpose relays are covered by different standards (IEC 60947-5-1 and IEC 61810 respectively), so check which one a specific datasheet actually references.
What is the difference between IEC 60669-2-2 and IEC 61810?
IEC 61810 covers electromechanical elementary relays as a general product family, without assuming any particular installation context. IEC 60669-2-2 is narrower: it is written specifically for remote-control switches in fixed household or similar electrical installations, which is exactly where impulse relays for lighting control are installed. A device sold as an impulse relay should reference the latter.
Does IEC 60669-2-2 cover LED inrush current?
Not directly. The standard's utilisation categories were defined around resistive, discharge-lamp and incandescent loads, not the capacitive inrush pulse drawn by LED drivers. A relay can pass every test in the standard and still be undersized for a specific LED lighting circuit if it is selected from the nameplate AC-1 current instead of the manufacturer's separate lamp-load table.
What does electrical endurance testing under the standard actually check?
It cycles the device on and off under rated load for a defined program of operations, then re-verifies contact resistance, temperature rise and insulation performance against the rated limits. It confirms the device keeps meeting its ratings after realistic years of daily switching, not just on the first operation out of the box.
Do mechanical and electronic impulse relays meet the same standard?
Both device types can be certified against IEC 60669-2-2, since the standard addresses performance requirements rather than internal construction. In practice they age differently: a mechanical ratchet mechanism wears with cycle count, while an electronic latching type is more exposed to control-wire noise causing unintended operation over a long cable run.
Where do I find the utilisation category for a specific impulse relay?
On the manufacturer's technical datasheet for that rating, listed alongside rated voltage and current — typically AC-1, AC-5a or AC-5b depending on the load type the contact is qualified for. It is rarely printed on the device body itself, so the datasheet is the reliable source before specifying against a particular lighting load.
Selecting with the Standard as a Starting Point
Standard compliance confirms a device was built and tested to a recognised baseline — it does not replace checking rated current against the actual load type, coil voltage against the building's control wiring, and the lamp-load table against the connected LED count. Treat IEC 60669-2-2 as the qualification filter that narrows the field to genuine impulse relays, then do the application-specific sizing before ordering.