Our Products

MODEL : D5C,D6C Series

Marelli Exd/Exde, ExNa , IE1,IE2,IE3

Protection Type Ex d - Explosion proof motors
EN/IEC 60079 - 1

Ex d protection is relevant the enclosure of the equipment. This type of protection does not cover measures to prevent the formation of a potentially explosive atmosphere. The safety level on an explosion proof motor is on the fact that it must ensure to withstand an internal explosion without transmitting it to the external environment. This is achived with regard to the specific type of gas present on the atsmosphere and therefore the relevant group. Electrical equipment with approval for explosion group IIC can also be used in explosion groups II A and II B. Internal pressure that can result of an explosion in the interior of the motor have to be wisthstanded by the main components (frame, endshields, internal bearing covers, terminal boxes). To achieve the above mentioned protection, related standard establishes minimum dimension of joints and gaps that has to be respected and sets up tests that has to be carried out. Ex d motors are certified by a Notified Body to be suitable for operation in zone 1.

Protection Type Ex de – Explosion Proof Motors with an increased safety terminal box
EN/IEC 60079 - 1 and EN/IEC 60079 - 7

This type of protection is a combination of a Ex d housing with an Ex e terminal box. The terminals and terminal box are designed to provide increased security against the possibility of excessive temperatures and of the occurrence of arcs and sparks in normal service or under specified abnormal conditions. To achieve the above mentioned protection, related standard establishes characteristics of material, creepage distances and clearances, minimum air gap and other details such devices to prevent rotation of cables. Ex de motors are certified by a Notified Body to be suitable for operation in zone 1.

Protection Type Ex nA – non sparking motors
EN/IEC 60079-15

Type of protection applied to electrical apparatus to prevent the potentially explosive atmosphere in normal operations which excludes thermal requirements due to starting or accidental stalling. Marelli Motori design this range of motors with special attention to prevent the ingnition and to minimize the risk of occurence of arcs or sparks capable of creating an ignition and to prevent that the internal and external surfaces temperatures do not overpass the maximum surface temperature certified. This type of protection is similar to the protection “e” but it is less strict concerning the materials, the abnormal conditions and the creepage distances and clearances. Ex nA motors don’t require certification by a third party Notified Body . The manufacturer conformity declaration is accepted.