CHT 250 Three-Phase Cast Iron Motor (37–55 kW)
CHT 250 three-phase cast iron motor — Chiaravalli's IEC frame 250 cast iron motors in the IE3 / IE4 efficiency classes, 2 / 4 / 6-pole, 37–55 kW. Cast iron casing, IP54, class F insulation, IC411 fan cooling, Δ/Y 400/690 V 50 Hz. Mounting B3, B5 or B35 — the dimension sheets give the frame 250 mounting dimensions per efficiency class.
How to pick from the table: choose the pole count for the speed you need, then the power and the efficiency class — IE3 or IE4 (we supply IE3 and above only from 0.75 kW up; IE4 where the energy saving pays). The type letter is the motor's length designation within the frame. Forced-cooling fan kits for inverter duty are available for every frame (catalogue p8).
Product Configuration
Select a row to add it to your quote
Three-phase Δ/Y 400/690 V 50 Hz; IP54, insulation class F, IC411 cooling; efficiency to IEC 60034-30 / 60034-2-1.
| Code | Type | Efficiency class | Poles | Power | Speed | Torque | Current at 400 V | Efficiency | cos φ | Efficiency at 75 % | Efficiency at 50 % | Ms / Mn | Mmax / Mn | Is / In | J0 | Weight |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
CHT 250 M6 IE3 |
M6
|
IE3
|
6
|
37 kW
|
975 r/min
|
362.4 Nm
|
67.3 A
|
93.3 %
|
0.85
|
94 %
|
91.8 %
|
1.8
|
2
|
7
|
0.9924 kg m²
|
371.0 kg
|
CHT 250 M6 IE4 |
M6
|
IE4
|
6
|
37 kW
|
980 r/min
|
360.7 Nm
|
68.1 A
|
94.5 %
|
0.83
|
94.7 %
|
94.3 %
|
2
|
2.1
|
8.3
|
1.6328 kg m²
|
405.0 kg
|
CHT 250 M2 IE3 |
M2
|
IE3
|
2
|
55 kW
|
2960 r/min
|
177.4 Nm
|
93.5 A
|
94.3 %
|
0.9
|
94.5 %
|
93.1 %
|
2.5
|
2.6
|
9.6
|
0.4443 kg m²
|
396.0 kg
|
CHT 250 M2 IE4 |
M2
|
IE4
|
2
|
55 kW
|
2980 r/min
|
176.3 Nm
|
93.6 A
|
95.3 %
|
0.89
|
95.5 %
|
94.3 %
|
2
|
2.3
|
9
|
1.044 kg m²
|
441.0 kg
|
CHT 250 M4 IE3 |
M4
|
IE3
|
4
|
55 kW
|
1470 r/min
|
357.3 Nm
|
95.4 A
|
94.6 %
|
0.88
|
95.2 %
|
94.5 %
|
2.5
|
2.5
|
8.5
|
0.765 kg m²
|
398.0 kg
|
CHT 250 M4 IE4 |
M4
|
IE4
|
4
|
55 kW
|
1480 r/min
|
355 Nm
|
96.5 A
|
95.7 %
|
0.86
|
95.9 %
|
95.3 %
|
2
|
2.3
|
9
|
1.4351 kg m²
|
471.0 kg
|
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Product Information
Reading the table
Each row is one motor of this frame size: the type letter and pole count (a 4-pole motor runs at about 1500 r/min on 50 Hz, 2-pole about 3000, 6-pole about 1000), the efficiency class, rated power, speed, rated torque, current at 400 V, efficiency and power factor. "Show starting and part-load data" adds the starting torque and current ratios (Ms/Mn, Mmax/Mn, Is/In), the rotor inertia J0 and, for IE3 / IE4 motors, the efficiency at 75 % and 50 % load.
Efficiency classes
From January 2017 the EU regulation (CE) 640/2009 requires motors of 0.75 to 375 kW with 2, 4 or 6 poles sold in the European market to be at least IE3. Nusaf supplies IE3 and above only from 0.75 kW up — IE1 motors are listed below 0.75 kW only. Efficiency figures follow IEC 60034-30 / 60034-2-1.
Fitting to a gearbox
The frame size is the IEC size the gearbox flange is specified by — a gearbox listed for "IEC 80" takes a frame 80 motor in B5 or B14. Mounting B3 (foot), B5 (flange) and B14 (face flange) dimensions are on the dimension sheets.
- Material
- Cast iron casing
Need help specifying this product?
Our technical team can help you specify the right component. Add it to your quote basket above, or contact us directly.