GOOD VIBRATION
The M3-E series is the increased safety version of the M3 series. Same frame, same dimensions, same multi-hole base — but a certification covering both gas and dust atmospheres.
Four references in 2 poles, from 0.635 to 2.94 kN, from 4.3 to 6.3 kg. It is the only compact format in the Italvibras catalogue usable in zones 1, 2, 21 and 22.
The two series share the frame, the bearing flange, the shaft, the multi-hole base and the position of the terminal box. The difference lies in the protection method, and it has concrete consequences for installation.
| M3 | M3-E | |
|---|---|---|
| Atmospheres covered | Dust only | Gas et dust |
| Protection method | Ex tD A21 T120 °C IP66 (Ex tb IIIC T120 °C Db) | Ex e IIC T4 Gb (increased safety) Ex tb IIIC T120 °C Db |
| Permitted zones | 21 et 22 | 1, 2, 21 et 22 |
| Polarities | 2 and 4 poles | 2 poles only |
| Supply | 24 to 690 V, and single-phase | 127/220, 200/346 or 210/363 V, three-phase only |
| Inverter | Unrestricted, 20 Hz to base frequency | Only with PTC thermistor |
| Terminal box | Standard connection | To be filled with silicone after connection |
| References | 6 | 4 |
The « e » method does not seek to contain an explosion, as a flameproof enclosure does. It seeks to prevent an ignition source from arising : no arc, no spark, no hot spot. The whole design therefore aims to eliminate clearances, heating and imperfect contacts — and that shifts part of the responsibility to the installer.
On the M3-E series, the catalogue is explicit : after connection, the user must fill the terminal box with a suitable silicone. It is that filling which removes the risk of tracking between conductors. A machine delivered compliant but connected without this step is no longer compliant.
The catalogue declares a tE time of 20 seconds, within the meaning of standard IEC/EN 60079-7. It is the time during which the motor, with the rotor locked, can rise in temperature without exceeding its permissible limit. That value is used to set the overload protection : the device must trip before the end of that period. It is not a decorative figure, it is a setting parameter.
Where the M3 series accepts an inverter without condition, the M3-E allows it only in the presence of a PTC thermistor, from 20 Hz to base frequency and at constant torque. The 130 °C thermistor is available on request : if variable-frequency control is envisaged, it must be ordered with the vibrator.
The M3-E does not accept the wide 24-690 V range of the M3 series. It is ordered in 127/220 V 50 Hz, 200/346 V 50 Hz or 210/363 V 60 Hz, three-phase only — there is no single-phase version. That is the first point to check before choosing this series.
The four references share power, current and tE time : only the static moment, the force and the length change, from 197 to 235 mm. The choice is therefore made on force alone. Note, as on the M3 series : the M3/305E-S02 délivre moins en 60 Hz qu'en 50 Hz (2.87 against 2.94 kN), so that on a 60 Hz supply it is equivalent to the M3/205E.
If your installation involves dust only, the M3 series is enough and leaves you more choice — 6 references, two polarities, a more flexible supply and single-phase. The M3-E is justified only if gas enters the zone classification.
Tell us the zone classification, the voltage available and whether an inverter is planned : we will confirm the reference and the options required.
Request a quoteData from the Italvibras general catalogue 2019, pages 54 and 55. Audimat Automation, official Italvibras distributor.
Neighbouring families and useful resources to refine your choice.