What is Class 1 Div. 2 ATEX? IECEx? Do PULS power supplies have such approval? | Automation.com

What is Class 1 Div. 2 ATEX? IECEx? Do PULS power supplies have such approval?

December 082014
What is Class 1 Div. 2 ATEX? IECEx? Do PULS power supplies have such approval?

Intention of all Hazardous Location approvals is to minimize the risk of explosion or fire due to sparks or excessive heat.


Below are some industries which would require such approvals:



  • Process Industry
  • Oil and Gas Industry
  • Gas Pumps, Gas Stations
  • Food and Beverage
  • Mining Industry
  • Waste Water Treatment Plant

Strict requirement for: spacing, fuses, relays, connectors, surface temperatures. The normal operation mode and several failures modes have to be investigated. Unfortunately, “The world” does not agree on uniform requirements…thus several approvals are needed.

Class I Div 2

  • Class I Div 2 is important for North America and Canada
  • It was the first Hazardous Location approval PULS applied for
  • Classification in “Classes” (Class I Div 2)

Applicable standards:

UL 1604: former standard for Class I Div 2 – become obsolete in 2012.

ANSI/ISA -12.12.01: Actually used for Class I Div 2 conformance investigations


  • IECEx is driven International
  • Classification in “Zone” similar to ATEX
  • Standards: IEC 60079-xx (harmonized standards)
  • An IECEx-Scheme is something similar to a CB-Scheme.
  • The IECEx-Scheme also follows the EU-directive 94/9/EU (ATEX)
  • Beside the European countries, Australia, Canada, China, Brazil, India, Japan, Korea, New Zealand, Singapore, South Africa and the USA belong to the 26 countries within the IECEx-Scheme
  • Refer to below link on the IECEx certificate of Conformity for PULS’s CPS20.241; 24VDC 20A Power Supply certified for use in Class 1 Zone 2 Groups IIa, IIb and IIc (Ex nA nC IIC T3 Gc)


   Key Points:

  • From 2005, ATEX and IECEx is technically identical standards for Electrical  Equipment (very few exceptions)
  • Manufacturer’s Self Certification is allowed under ATEX but not under IECEx
  • When using IEC standards a single set of Test and Assessments can be used for both IECEx and ATEX, in accordance with the respective rules
  • An ATEX EC Type Examination can be based on an IECEx ExTR. But ATEX  documentation alone is not sufficient for IECEx
  • QA audits are the same for both IECEx and ATEX.


  • ATEX is important for Europe (EU-directive 94/9/EG).
  • Classification in “Zones” (PULS units are usually Zone 2)
  • Applicable standards: EN 60079-0, EN 60079-15
  • Refer to below link on the ATEX approval certificate for PULS’s CPS20.241; 24VDC 20A Power Supply certified for deployment use in hazardous locations Zone 2 Category 3G (II 3G Ex nA nC II T3 Gc)


So as a Power Supply manufacturer which provides solution globally, it is our responsibility to provide the ease of mind for customer in their design and planning for equipment for Class 1 Div 2, ATEX and IECEx requirements.

And… YES! Here in PULS we have our all new CPS20.241 and QS40.241, 24V/20A and 24V/40A Single Phase Input Power Supply that conform to Class 1 Div 2, ATEX and IECEx Hazardous Location approvals!

So is it going to Class 1 Div 2, ATEX or IECEx for the next project?

Don’t worry as PULS’s CPS20.241 and QS40.241 are ready for all. Furthermore, they are ATEX/IECEx approved by design.

What is “ATEX/IECEx-by-design”?
Usually, in order to achieve ATEX/IECEx approval, the PCB of the power supplies must be heavily coated. The PCB coating process is an unreliable and costly

Typically a power supply with ATEX/IECEx approval is 50% to 100% more expensive than the non-ATEX/IECEX models.
This is especially true for higher wattage power supplies like a 20A and 40A PSU.

With ATEX/IECEx-by-Design, PULS is the first one in the industry to achieve ATEX/IECEx approval without the expensive and unreliable PCB coating process, but by smart internal design instead.

As such, we call it “ATEX/IECEX-by-Design”. So PULS product with ATEX/IECEx-approval has the same costs as the non-ATEX/IECEx models.

Using PULS ATEX/IECEx approved power supplies, customers don’t have to pay the hefty sure-charge for ATEX/IECEX-approval when they use our QS40 & CPS20 product family.

Cool-Gaper and Compact Size

CPS20 and QS40 are currently the smallest 20A and 40A Din Rail power supply in the industry. These help customers to reduce “real estate” in a space limited cabinet.

In a redundancy system application using either CPS20/QS40, Two power supplies can be put side by side each other with our MOSFET redundancy module in between without any spacer. Thanks to the high efficiency found our CPS20 & QS40 product as well as the extremely low power loss with our MOSFET Redundancy module (YR40 & YR80) series. With low power losses on the MOSFET redundancy module, it acts as a heat insulator and cools down the ambient temperature. Refer to FIGURE 1 below. By the way, PULS YR40 & YR80 family are also ATEX/IECEx approved by-Design.

Light weight
DIN-Rail was not intended to carry heavy but rather light-weight components like Sensors, MCB, and Relays etc.. A 40A power supply from our competitor weighs almost 4KG versus PULS QS40 which just weigh 1.9KG.

Imagine a 40A redundancy system using two pieces of 4KG PSU from our competitor versus a solution from PULS at just half the weight.

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