CEMP E3A/E4A Series Flameproof Motors Ex db IE3 IE4

Ex db flameproof motors in IE3 and IE4 efficiency for gas and dust areas

The CEMP E3A/E4A series are flameproof three-phase motors in IE3 premium and IE4 super-premium efficiency, built by CEMP s.r.l. in Senago, Milan. The gas and dust version is offered with Ex db, Ex db eb, Ex tb and Ex tc protection, with a terminal box in Ex db or Ex eb. The range covers IEC frame sizes 80 to 355 and power from 0.75 to 375 kW, for continuous or intermittent duty. The brochure also notes that legacy IE1 and IE2 efficiency is still available.

Technical specifications

Options, accessories and services

Mechanical options listed in the brochure include special flanges and shafts, locked, roller or special bearings, terminal box on the side, SPM vibration probe, double ended shafts, cable gland fitted to the terminal box, condensation drain valve, grade A or B vibration levels, rain cap, sun shield or water shredding disk, low noise, an auxiliary terminal box and an increased safety Ex eb terminal box in AISI 316 stainless steel. Low temperature motors for -60 C are listed. Accessories include forced ventilation (IC416), encoders from 100 to 10,000 ppr, bearing sensors, bimetallic thermal protection, PTC thermistors, Pt-100 and anti-condensation heaters. Electrical options include special voltage and frequency, two speeds, single phase with permanent capacitor, tropical climate construction, Class H insulation and suitability for frequency converter drives.

The brochure also lists brake options on related series and engineering services: start-up behavior analysis, superimposed motor and driven machine curves, load and thermal tests per IEC 60034-2-1, torque speed curve measurement, insulation tests, ATEX, IECEx and UL approved thermal tests, and Bureau Veritas and Korean Register type approval for naval applications.

Selection guidance

Ex db flameproof motors are chosen when the gas group, zone and temperature class require flameproof containment of an internal ignition. Select by power, poles, frame, voltage and frequency, mounting, cooling method and the gas or dust group and temperature class of the area. Where the motor is driven by a frequency converter, confirm the thermal protection and whether the certificate covers inverter duty. The brochure is a range overview with reference values, so certificate scope, performance data and nameplate marking have to be confirmed for the exact motor.

Documents and quotation

Send frame size or kW, poles, voltage, frequency, mounting, duty, zone, gas or dust group, temperature class, ambient range and required accessories. Never assume certification beyond what the brochure states for each protection type.

The manufacturer document is attached to this page and listed below. Seven Star LLC is an independent supplier in Muscat and can quote against the model code, quantity and delivery location. Browse more instruments in Electric Motors, or see the CEMP brand page.