NEMA Flameproof Motors

Low voltage NEMA motors for Hazardous Areas

4KTU series

Benefits

Highest degree of safety and reliability

Modular design, which allows execution of all NEMA forms and different positions/rotations of connection box

Flameproof cast iron frame and connection box

CSA certified

Wide ingress protection range: IP55 up to IP65

Suitable for Ambient Temperatures from -4 °F/-20 °C to +104 °F/+40 °C

Temperature class T4 to T6

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Marking

CSA:

Class I, Division 1, Group C and D; T4-T6; IP65/ Encl Type 4X
Class II, Division 1 and 2, Groups E, F and G
Ex d IIC, T4-T6 Gb
Class I, Zone 1, Ex d IIC
Class I, Zone 1, Ex d IIB
Class I, Zone 1, Ex d IIA
Class II, Zone 21, Ex tb
Class II, Zone 22, Ex tb

Ingress protection

Standard IP55

On request up to IP65

Ambient temperature

Standard -4 °F/-20 °C to +104 °F/+40 °C

Ambient Temperature

Standard: -4 °F/-20 °C to +104 °F/+40 °C

Certification

CSA
- EN

Description

Flame proof AC electric motors are used in hazardous locations or potentially hazardous environments where concentrations of combustible gases, vapors and or dust are present or present some of the time. The type 4KTU motors are totally enclosed and fan-cooled (TEFC), as per NEMA MG-1 Part 6. Non-ventilated versions (TENV), air over (TEAO) and with forced ventilation (TEFV) are available. The asynchronous motor with its short-circuit and robust construction offers an excellent price-performance ratio.

Motors type 4KTU can be manufactured to NEMA frame size 143 to 365 as well as IEC frame size 71 to 255. 4KTU motors are three-phase, asynchronous electric motors with short circuit rotor, explosion-protected according to the:

“Flame-proof enclosure” for the motor housing and “Increased safety” for terminal box according to UL 60079-1/CSA C22.2 60079-1, UL 60079-7/CSA C22.2 60079-7 and CSA C22.2 No. 30 (Class I, Zone I)
“Flame-proof enclosure” for the motor housing and “Flame-proof enclosure” for terminal box according to UL 60079-1/CSA C22.2 60079-1 and CSA C22.2 No. 30 (Class I, Zone I)
Dust Ignition Proof “DIP” (Class II, Division 1) according to CSA C22.2 No. 25
Dust protected “NI” (Class II, Division 2) according to CSA C22.2 No. 25
Protection by Enclosure “Ex tb” (Class II, Zone 21) according to UL 60079-31/CSA C22.2 No. 60079-31

The standard electric motor is suitable for T4 to T6 temperature classes or the maximum +257 ˚F to +185 ˚F/+125 ˚C to +85 ˚C surface temperatures of equipment. Type 4KTU motors are available in a high efficiency class.