Motorola intrinsically safe radios: every ATEX & IECEx certified model compared

Motorola Solutions offers two primary intrinsically safe radio platforms, each in two form factors. All are certified to Ex ib IIC T4 Gb, covering Zone 1 and Zone 2 for all gas groups including hydrogen.

The DP4401Ex is the more common choice for general plant use — its compact form factor fits easily in a hand or chest harness. The DP4801Ex is preferred by control room operators and supervisors who need to enter text or switch channels by number. Both support DMR Tier III trunking when connected to a MOTOTRBO Capacity Max system.

Motorola offers region-specific certification variants of the same hardware. Understanding which certificate applies to your market avoids procurement delays and compliance issues.

ATEX (Directive 2014/34/EU) is mandatory for the EU/EEA market. The ATEX-certified DP4401Ex and DP4801Ex carry a CE mark with the ATEX hexagon symbol and a four-digit Notified Body number. This is the variant most commonly stocked by European distributors. For a full explanation of the directive's scope and conformity requirements, see the ATEX Directive 2014/34/EU reference on exknowledge.com.

IECEx is the international certification system accepted in most countries outside the EU — including Australia, Singapore, Brazil, and parts of the Middle East. The IECEx certificate references the same IEC 60079 standards as ATEX. Many Motorola Ex radios carry dual ATEX + IECEx certification, allowing deployment across both EU and international sites without separate procurement.

UL (Class I, Division 1) applies to the North American market, where the NEC Division system is used instead of IEC zones. The UL-certified variants are electrically identical but carry different labels and documentation. A radio certified to Class I, Division 1 can be used in Division 1 and Division 2 areas. If your site operates under both IEC and NEC classification systems, dual-certified radios simplify fleet management.

The most common compliance failure with Motorola intrinsically safe radios is using non-certified accessories. Every component that enters the hazardous area — battery, antenna, speaker-microphone, earpiece, carry case — must be listed on the radio's Ex certificate schedule.

Batteries. The DP4401Ex and DP4801Ex use dedicated IMPRES Ex battery packs (PMNN4467, PMNN4468). Standard IMPRES batteries from non-Ex Motorola radios are physically compatible but not certified — using one invalidates the radio's Ex protection. The Ex battery packs have a lower capacity than standard IMPRES batteries because the intrinsic safety barrier limits charging and discharging energy.

Speaker-microphones. Motorola's PMMN4106 remote speaker-microphone is the certified accessory for hazardous area use. Third-party speaker-microphones — even those marketed as "Ex compatible" — are not covered by Motorola's certificate unless explicitly listed. The PMMN4106 has its own Ex marking and is assessed as associated apparatus.

Charging. IMPRES Ex chargers are designed for safe-area use only. The standard practice is to remove the radio from the hazardous area before placing it in the charger. Some sites install Zone 2-rated multi-unit chargers in transition areas — confirm the charger carries its own Ex ec or Ex nA certification for Zone 2 if this is your approach.

Motorola dominates the intrinsically safe radio market, but several alternatives offer competitive specifications. The choice often comes down to existing infrastructure — a site already running a MOTOTRBO network has strong reasons to stay with Motorola, while greenfield deployments can evaluate all vendors equally.

For a detailed specification comparison of all these models, see the full multi-vendor intrinsically safe radio comparison. The complete guide to hazardous area equipment selection covers how zone classification, gas groups, and temperature classes determine which radio is suitable for your site.