Что такое IEC 60947-5-1? Кнопки и основы устройства цепей управления
Узнайте, какие требования IEC 60947-5-1 распространяются на кнопки, селекторные переключатели, контактные блоки и индикаторные лампы и что необходимо проверить покупателям.
IEC 60947-5-1 is the international standard that defines how electromechanical control circuit devices — push buttons, selector switches, indicator lights, and their contact blocks — must be designed, rated, tested, and marked. If you are specifying or buying any of those components for a control panel or machine, this is the standard that governs what the numbers on the datasheet mean and what the markings on the device body are supposed to tell you. The 2024 edition (fifth edition, published 2024-03-26) is the current version. It cancels and replaces the fourth edition from 2016.
What IEC 60947-5-1 Actually Covers
The full title is “Low-voltage switchgear and controlgear — Part 5-1: Control circuit devices and switching elements — Electromechanical control circuit devices.” It sits inside the IEC 60947 family, which covers low-voltage switchgear and controlgear broadly. Part 5-1 is specifically about the devices used to control, signal, and interlock other switchgear and controlgear — not the power-switching devices themselves.
The standard applies to control circuit devices with:
Rated voltage not exceeding 1000 V AC at frequencies up to 1000 Hz
Rated voltage not exceeding 600 V DC
That covers the vast majority of 24 V DC control circuits, 110 V AC and 230 V AC control circuits found in industrial panels worldwide.
The standard does not cover every device that looks like a push button. Devices intended primarily for household or similar use fall under different IEC standards. Always confirm the specific product is tested and marked to IEC 60947-5-1, not a lighter-duty standard.
Figure 1. The standard covers control circuit devices used for control, signalling, interlocking, and related panel functions.
Equipment the Standard Covers
IEC 60947-5-1 applies to a defined set of device types. Understanding which devices fall under it helps you know what to demand from a supplier.
Push buttons and mushroom-head actuators — momentary or maintained, flush or extended, with or without illumination. These are the most common devices covered. See the Ассортимент кнопок Shieldhz for examples of how these are catalogued in practice.
Selector switches — two-position and three-position rotary types, key-operated variants, and cam-operated types. They may be momentary-return or maintained-position.
Indicator lights and pilot lights — signal lamps and LED indicator assemblies used to show machine state. These are covered for their constructional and marking requirements, including illumination voltage.
Контактные блоки — the electrical switching elements that attach to actuator heads. A contact block is what actually makes or breaks the circuit. The standard defines how contact blocks must be rated, tested, and marked independently of the actuator.
Reed contact magnetic switches — the 2024 edition explicitly addresses these, reflecting their growing use in position sensing and interlocking applications.
Audible signalling devices — buzzers and similar devices used for alerting. The 2024 revision added specific information requirements for these.
Class II circuit devices — devices achieving safety by double or reinforced insulation rather than protective earthing. The 2024 edition added specific requirements for this category.
How Push Buttons, Selector Switches, Contact Blocks, and Indicator Lights Fit Together
Most IEC 60947-5-1 devices are modular. An actuator head (the part the operator touches) mounts into a panel cutout and accepts one or more contact blocks from the rear. Indicator lights follow the same body format in many product families, sharing the same cutout diameter.
Panel cutout diameter is one of the first things to confirm. Common sizes are 16 mm, 22 mm, and 30 mm. Mixing actuator heads and contact blocks from different manufacturers is possible only if the mechanical interface is compatible — do not assume it is. Verify with the supplier.
Контактные блоки are rated separately. A single actuator head may accept one, two, or more contact blocks stacked together. Each block carries its own current and voltage rating. The total number of contacts in a circuit must not exceed what the block is rated for.
For a deeper look at how push button assemblies work mechanically and electrically, the Руководство по нажатию кнопки Shieldhz covers the fundamentals in plain terms.
Figure 2. NO and NC contact blocks determine what signal the control circuit receives when the operator actuates the device.
Contact Logic: NO, NC, Maintained, Momentary, Illuminated
Getting contact logic wrong is one of the most common panel wiring errors. IEC 60947-5-1 defines the terminology precisely.
Normally open (NO) — the contact is open (circuit broken) when the actuator is in its rest position. Pressing the button closes the contact. Used for start commands.
Normally closed (NC) — the contact is closed (circuit made) when the actuator is in its rest position. Pressing the button opens the contact. Used for stop commands and interlocks.
Momentary action — the contact returns to its rest state when the actuator is released. Standard push buttons are momentary.
Maintained action (latching) — the contact stays in its operated state after the actuator is released. Requires a second operation to return. Selector switches are typically maintained.
Illuminated push buttons and selector switches — contain an integral lamp or LED. The illumination circuit is separate from the contact circuit. The illumination voltage must be confirmed independently. A 24 V DC contact block does not mean the lamp is rated for 24 V DC — check the lamp voltage specification on the datasheet.
For indicator lights specifically, illumination voltage, LED colour, and lens type are the primary selection parameters. The Руководство по эксплуатации индикатора Shieldhz covers those in detail.
Ratings and Markings to Check on Datasheets and Device Bodies
IEC 60947-5-1 specifies what must be marked on the device or its packaging. When you receive a product, these are the items to verify.
Rated operational voltage (Ue) — the voltage the contact is rated to switch under load. This is not the same as the insulation voltage. Confirm Ue matches your control circuit voltage.
AC and DC ratings are separate. A contact block rated 240 V AC / 10 A is not automatically rated for 240 V DC. DC is harder to interrupt because there is no natural current zero crossing. Always check the DC rating explicitly if your circuit is DC.
Rated operational current (Ie) — the current the contact can make and break at rated voltage. Check this against your actual load, including inrush for inductive loads.
Utilisation category — IEC 60947-5-1 defines categories such as AC-15 (control of electromagnetic loads, AC) and DC-13 (control of electromagnetic loads, DC). These categories determine the test conditions the contact was verified against. Match the category to your load type.
Mechanical endurance — the number of operating cycles the device is rated for without electrical load. Typical values range from 1 million to 10 million cycles depending on the product.
Electrical endurance — the number of operating cycles at rated load. This is always lower than mechanical endurance. For high-cycle applications, electrical endurance is the limiting figure.
Terminal marking — IEC 60947-5-1 requires terminals to be marked so the circuit can be traced. NO contacts are typically marked with numbers ending in 3 and 4 (e.g., 13-14). NC contacts are typically marked with numbers ending in 1 and 2 (e.g., 11-12). Verify the marking scheme matches your wiring documentation.
Степень защиты IP — the ingress protection rating of the assembled device in its panel cutout. The IP rating of the actuator head alone is not the same as the IP rating of the complete assembly. Confirm the IP rating is stated for the assembled configuration.
Degree of protection (enclosure) — related to IP but also covers impact resistance. For harsh environments, check both.
Figure 3. Datasheet checks include voltage, contact configuration, terminal marking, endurance, illumination voltage, and enclosure requirements.
Service Conditions, EMC, and Safety Notes in the 2024 Edition
The 2024 revision updated several technical areas that matter for product selection and installation.
Normal service conditions including shock and vibration — the 2024 edition revised the requirements for shock and vibration. If your application involves significant vibration (machine tools, mobile equipment, compressors), confirm the product has been tested to the current edition’s vibration requirements, not just an older edition.
EMC requirements — control circuit devices can be sources of conducted and radiated interference, and they can also be susceptible to interference from variable frequency drives and other sources. The 2024 edition addresses EMC requirements. In panels with VFDs or other noise sources, this matters.
Pull-out tests — the 2024 edition added or revised pull-out test requirements for contact blocks and actuator assemblies. This is relevant for applications where vibration or cable tension could dislodge a contact block from its actuator.
Class II devices — if your application requires double or reinforced insulation (certain safety circuits, specific machinery directives), confirm the product is specifically rated as a Class II device under IEC 60947-5-1:2024, not just assumed to be safe because it is plastic-bodied.
Reed contact magnetic switches — if you are using magnetic switches for position sensing or door interlocking, confirm they are covered under IEC 60947-5-1 and check the specific magnetic actuation distance and force specifications.
Red mushroom-head push buttons are commonly used as emergency stop devices. IEC 60947-5-1 covers the electromechanical construction and ratings of those buttons. It does not, by itself, make a device a compliant emergency stop.
Emergency stop functions are governed by IEC 60947-5-5 (mechanical latching, direct opening action requirements) and by machine safety standards such as ISO 13850. A device used as an emergency stop must meet the direct opening action requirement — meaning the NC contact must open positively when the actuator is operated, regardless of contact welding or spring failure.
Do not assume that any red mushroom button is suitable for emergency stop use. Check that the specific product is rated and marked for emergency stop duty, and verify compliance with the applicable machine safety standard for your application. Local regulations and the machinery directive or equivalent in your jurisdiction may impose additional requirements.
Figure 4. Push buttons, selector switches, and indicator lights work together as the operator interface for machine and panel control.
Shieldhz Products in This Category
Shieldhz supplies push buttons, indicator lights, and selector switches intended for industrial control panel applications. If you are evaluating Shieldhz products against IEC 60947-5-1:2024, the steps are the same as for any supplier:
Obtain the product datasheet and confirm the rated operational voltage, current, utilisation category, mechanical endurance, and electrical endurance are stated.
Confirm whether the product has been tested to IEC 60947-5-1:2024 or an earlier edition, and whether a test certificate or declaration of conformity is available.
Confirm the IP rating is stated for the assembled configuration in the panel cutout, not just the actuator head alone.
For illuminated devices, confirm the lamp or LED voltage separately from the contact voltage.
For emergency stop applications, confirm the device carries the appropriate direct opening action marking and meets IEC 60947-5-5 requirements.
Do not rely on product images or general catalogue descriptions for compliance decisions. Request the datasheet and certificate for the specific part number.
These errors appear regularly in panel builds and procurement:
Using AC-rated contacts on DC circuits without checking the DC rating. DC interruption is more demanding. The DC rating is almost always lower than the AC rating at the same voltage.
Assuming all 22 mm products from different brands are interchangeable. The cutout diameter may match, but the contact block interface, mounting depth, and accessory compatibility often do not.
Specifying illumination voltage by assumption. A 24 V DC control circuit does not mean the lamp is 24 V DC. Some product families offer 24 V, 110 V, and 230 V lamp options in the same body. Ordering the wrong lamp voltage is a common mistake.
Ignoring electrical endurance for high-cycle applications. Mechanical endurance figures look impressive. Electrical endurance at rated load is the number that matters for longevity.
Treating the IP rating of the actuator head as the IP rating of the assembly. The rear of the assembly, including contact blocks and wiring, must also be considered. The IP rating of the complete assembly in its cutout is what protects the circuit.
Not verifying the edition of the standard the product was tested to. The 2024 edition introduced changes. For new designs, confirm the product was tested to the current edition if that matters for your compliance documentation.
Практический контрольный список для покупки
Before placing an order for push buttons, selector switches, or indicator lights, confirm the following:
Rated operational voltage (Ue) matches control circuit voltage
AC or DC rating confirmed for your circuit type
Utilisation category (AC-15, DC-13, etc.) matches load type
Rated operational current (Ie) covers actual load including inrush
Contact configuration (NO, NC, or combination) matches wiring diagram
Number of contact blocks per actuator confirmed
Panel cutout diameter confirmed (16 mm, 22 mm, or 30 mm)
Illumination voltage confirmed separately (if illuminated)
IP rating confirmed for assembled configuration
Mechanical and electrical endurance figures reviewed for cycle rate
Terminal marking scheme confirmed against wiring documentation
Test certificate or declaration of conformity available for the specific part number
Emergency stop devices verified against IEC 60947-5-5 and applicable machine safety standard
Local electrical code and machinery directive requirements verified independently
Часто задаваемые вопросы
Что такое IEC 60947-5-1?
IEC 60947-5-1 - это стандарт IEC на электромеханические устройства цепей управления и коммутационные элементы. Он распространяется на кнопки, селекторные переключатели, индикаторные лампы, контактные блоки и связанные с ними устройства, используемые в низковольтных цепях управления. Он определяет, как эти устройства должны быть рассчитаны, сконструированы, испытаны и промаркированы. Текущее издание - пятое, опубликовано 2024-03-26.
На какой диапазон напряжений распространяется IEC 60947-5-1?
The standard applies to devices with rated voltages up to 1000 V AC (at frequencies up to 1000 Hz) and up to 600 V DC. This covers the control circuit voltages used in the vast majority of industrial panels, including 24 V DC, 48 V DC, 110 V AC, and 230 V AC.
В чем разница между нормально открытым и нормально закрытым контактом?
A normally open (NO) contact is open (circuit broken) when the actuator is at rest and closes when operated. A normally closed (NC) contact is closed (circuit made) when the actuator is at rest and opens when operated. The distinction is critical for control logic — start circuits typically use NO contacts, stop and interlock circuits typically use NC contacts.
Охватывает ли IEC 60947-5-1 кнопки аварийной остановки?
It covers the electromechanical construction and ratings of push button devices, including mushroom-head types. However, emergency stop function requirements — specifically the direct opening action requirement — are covered by IEC 60947-5-5. Emergency stop applications must also comply with machine safety standards such as ISO 13850. A red mushroom button is not automatically a compliant emergency stop device.
Что изменилось в издании 2024 года по сравнению с изданием 2016 года?
The 2024 fifth edition revised or added requirements in several areas: scope and exclusions, control circuit requirements, normal service conditions (shock and vibration), information and marking, constructional requirements and safety-related tests, EMC requirements, reed contact magnetic switches, Class II circuit devices, pull-out tests, audible signalling device information, and a new Annex O. If your compliance documentation references the fourth edition (2016), review whether the changes in the 2024 edition affect your specific application.
Почему в технических описаниях контактных блоков номиналы переменного и постоянного тока указаны отдельно?
DC circuits are harder to interrupt than AC circuits at the same voltage because AC current passes through zero twice per cycle, which naturally extinguishes the arc. DC has no zero crossing, so the arc must be mechanically extinguished. This means a contact block rated for 240 V AC / 10 A will typically have a lower DC voltage or current rating. Always check the DC rating explicitly for DC control circuits.
Какую степень защиты IP следует указать для кнопок в панели управления?
It depends on the environment. IP65 is a common minimum for panels exposed to wash-down or significant dust. IP67 or IP69K may be required for food processing or outdoor applications. The IP rating must be confirmed for the complete assembled device in its panel cutout — not just the actuator head. Check the product datasheet for the IP rating of the full assembly, and verify that the rating meets the requirements of your installation environment and any applicable local standards.
Окончательный вывод
IEC 60947-5-1 gives you a consistent framework for understanding what the numbers on a push button or contact block datasheet actually mean. The 2024 edition is the current reference. When you are specifying or buying control circuit devices, the standard tells you what to ask for: rated operational voltage, utilisation category, contact configuration, endurance figures, IP rating for the assembly, and a test certificate tied to the specific part number. For emergency stop applications, go further and verify IEC 60947-5-5 compliance and the applicable machine safety standard. Final selection still has to be checked against the machine safety assessment, product datasheet, installation environment, and local code. The checklist above covers the practical steps. If you need to verify what a specific Shieldhz product covers, start with the datasheet and the declaration of conformity for that part number.
