Explosion-protected low-voltage motors Ex db / Ex eb / Ex ec / Ex tb-tc 0.06–710 kW

Country: Germany · Model: Ex db / Ex eb / Ex ec / Ex tb-tc

Low-voltage explosion-protected induction motors rated 0.06–710 kW in protection types Ex db, Ex eb, Ex ec and Ex tb/tc. They cover gas zones 1 and 2 and dust zones 21 and 22, with protection degree IP55–IP66. They work at refining, chemical and gas facilities.

Ex db / db eb (zone 1/21): frame 63–315 (355), 0.12–315 (355) kW, IE3/IE4, IIC T4 (T6)
Ex eb (zone 1/21): frame 63–400, 0.18–300 kW, IE2/IE3, IIC T1/T2, T3 (T4)
Ex ec (zone 2/22): frame 63–450, 0.06–710 kW, IE3/IE4
Ex tb / tc: enclosure protection for dust zones 21/22

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Technical specifications

Ex db / db eb (zone 1/21)	frame 63–315 (355), 0.12–315 (355) kW, IE3/IE4, IIC T4 (T6)
Ex eb (zone 1/21)	frame 63–400, 0.18–300 kW, IE2/IE3, IIC T1/T2, T3 (T4)
Ex ec (zone 2/22)	frame 63–450, 0.06–710 kW, IE3/IE4
Ex tb / tc	enclosure protection for dust zones 21/22
Protection degree	IP55–IP66
Certification	ATEX; EU certificates PTB Braunschweig and IBExU Freiberg; IECEx QAR
Standards	EN 60079-0, -1, -7, -31; EN 60034
Recommendation	design per VIK (01/2018)

Specifications are taken from the manufacturer’s technical documentation. Updated 11/09/2026.

Description

The flameproof enclosure Ex db and Ex db eb (increased-safety terminal box) is designed for zones 1 and 21, frames 63–315 (355), power 0.12–315 (355) kW, classes IE3 or IE4, marking IIC T4 (T6), speeds 3000, 1500, 1000 and 750 rpm. The housing withstands an internal explosion and does not let flame out, so the motor tolerates overloads well. Increased safety Ex eb for the same zones is implemented in frames 63–400 at 0.18–300 kW, classes IE2 or IE3, marking IIC T1/T2, T3 (T4). These motors are tested and certified by PTB Braunschweig and IBExU Freiberg to EN 60079-0 and EN 60079-7. Ex ec motors (formerly nA) for zones 2 and 22 have frames 63–450 and 0.06–710 kW, classes IE3 or IE4, optionally thermal class H. For dust zones there is enclosure protection Ex tb and Ex tc. The motors are available per the VIK recommendation (01/2018), the production is certified to ATEX and IECEx QAR, and the Ex db eb IE3-W4.R series was relaunched in 2022.

How to choose

The protection type is selected by zone. For zones 1 and 21 take Ex db when an enclosure that withstands an explosion is needed, or Ex eb when 300 kW and frame 400 are enough. For zones 2 and 22 Ex ec is sufficient, and it has the widest power range, up to 710 kW. Separately check the temperature class against the auto-ignition temperature of the medium, since for Ex db it is T4 (T6) and for Ex eb the range is T1/T2, T3 (T4).

Request a price and lead time

Explosion-protected low-voltage motors Ex db / Ex eb / Ex ec / Ex tb-tc 0.06–710 kW. We reply within one business day.

Or email office@usk.ua or call +38 (044) 339-50-20.

FAQ

Which zones are Ex db and Ex eb motors suitable for?

For zones 1 and 21, where an explosive atmosphere is possible in normal operation. The Ex ec version is intended for zones 2 and 22.

What is the maximum power of the explosion-protected motors in this range?

In the Ex ec version up to 710 kW in frames 63–450. Ex db goes up to 315 (355) kW, Ex eb up to 300 kW.

To which standards and certificates are these motors made?

Ex db is made to EN 60079-0 and EN 60079-1 (ATEX), Ex eb to EN 60079-7. There are EU certificates from PTB Braunschweig and IBExU Freiberg, and the production holds IECEx QAR.

Which explosion-protected motors can this series replace?

The series serves as a replacement for motors AIM, VA, 2V and AV, which work in gas, oil and chemical production.