When a production line stops, the most valuable thing is time; finding the right motor is as important as finding it fast. With IE4 super premium efficient motors, the buyer's most frequent question is: "Which kW and which speeds are available fast from stock, and which require a special order and long lead time?" In this article we look, from the buyer's perspective, at the commonly stocked powers in the IE4 range, the priority pole/speed options, the frame range and the standard combinations to choose for fast delivery. The aim is to help you set the right expectation before ordering and plan without lead-time surprises.

IE4 motor stock range: which kW and speeds are available fast from stock

The Stocked Power Range in the IE4 Family (0.75-200 kW)

IE4 motors are generally produced over a wide power range, from 0.25 kW to 355 kW. But in terms of fast availability from stock, the most densely available and fastest-shipped band is between 0.75 kW and 200 kW. This range covers the needs of the vast majority of industry: almost all pump, fan, compressor, conveyor and general-purpose drive applications fall within this power band. The 0.75-200 kW range also covers the critical zone where regulation mandates IE4; demand for IE4 in these powers is therefore high and stock depth is relatively greater.

Very small powers (0.25-0.55 kW) and very large powers (250-355 kW) are usually stocked more limitedly; at these extremes some combinations may be made to order. We cover which power requires which efficiency class from which date in IE3 and IE4 efficiency mandate and the role of IE4 in the 75-200 kW band in should you move to IE4 or stay with IE3?.

Priority Speed/Pole: Why Do 2 and 4 Poles Come First?

The second most important axis that determines stock depth is speed. In the IE4 range, 2-pole (about 3000 rpm) and 4-pole (about 1500 rpm) motors are by far the most stocked options, because most industrial applications run at these two speeds. 4-pole is the most common choice for conveyors, gearbox input, mixers and general drive; 2-pole is sought especially for high-speed loads such as pumps, fans and compressors.

6-pole (about 1000 rpm) and 8-pole (about 750 rpm) low-speed motors are also in the range, but their stock depth is more limited than 2 and 4 poles; some power-speed combinations may be made to order. We cover the efficiency and torque balance in low-speed 6/8-pole motors in efficiency and torque in IE4 low-speed 6 and 8-pole motors and 2-pole power selection for pumps and fans in IE4 2-pole 3000 rpm motor. You can find how many poles each job needs in general in the asynchronous motor purchasing guide: 2, 4, 6 poles.

The Most Sought-After kW Values

In practice, the powers that move fastest from stock are the standard steps most used in industry: 0.75 - 1.1 - 1.5 - 2.2 - 3 - 4 - 5.5 - 7.5 - 11 - 15 - 18.5 - 22 - 30 - 37 - 45 - 55 - 75 - 90 - 110 - 132 - 160 - 200 kW. Because these steps follow the IEC standard, both motors and spares are easy to find. At these powers, 4-pole and 2-pole combinations are mostly available from stock. We cover the stock and supply status of medium-large powers such as 30 and 37 kW in detail in 30 and 37 kW IE4 motor stock and supply guide. Intermediate or non-standard powers (for example 17 or 25 kW) are usually rounded up to the next standard power or made to order.

The Relationship Between Frame Range, Mounting Type and Stock

The frame range in the IE4 family extends from IEC 63 to 355L. From a stock standpoint, the mounting type also affects availability: the most commonly stocked mounting types are foot-mounted (B3), large flange (B5) and combined (B35) motors. B14 small flange types are found mostly in smaller frames (generally up to 160). Choosing the right mounting type both speeds up availability from stock and guarantees fit to the machine. We cover mounting type codes and selection in B5 flange or B14 flange? and reading the IM mounting code in reading the motor IM mounting code (IM B3, IM B5, IM V1).

IE4 motor frame range, mounting type and standard power steps stock table

B3, B5, B35: Which Mounting Is Supplied Faster?

Foot-mounted (B3) motors are the most stocked type for belt-pulley, coupling and general floor mounting. Large flange (B5) motors are sought for direct flange connection to a gearbox, pump or fan housing. B35 offers both foot and flange connection, making it the most flexible option and widely available. Details such as terminal box orientation can sometimes be non-standard; stating this before ordering is important for lead time. You can find terminal box orientation and cable entry side selection in motor terminal box orientation and cable entry side.

IE4 Motors Requiring Special and Long Lead Times

Some IE4 motors are, by their nature, supplied to order rather than from stock. These include very large powers (250-355 kW), some 6/8-pole low-speed combinations, special voltage/frequency requests (for example 60 Hz or 690 V), exproof/ATEX requirements, special paint/RAL colours, and versions with external forced cooling fans or brakes (brake motors). Each of these features lengthens the production process. We cover brake IE4 motor supply in IE4 brake motor supply and the external cooling fan solution in external forced cooling fan in IE4 motors. You can find special RAL colour and OEM coding requests in RAL colour and custom paint in cast iron motors.

In project-based bulk purchases and large powers, lead-time planning is especially important. We detail stock, lead time and project planning in IE4 premium motor supply in IE4 premium efficient motor supply and the lead-time and shipping plan for powers above 90 kW in high-power motor supply above 90 kW.

Mechanical Compatibility on the Move to IE4 and Its Stock Link

A common question when moving to an IE4 motor is whether the new motor has the same frame, foot and shaft dimensions as the old one. Thanks to the IEC standard, mechanical dimensions are largely preserved at the same kW and frame size; this means a standard IE4 motor supplied from stock fits the existing machine smoothly in most cases. However, as the efficiency class rises, the frame size of some motors may change by one step; so before transition you must verify the foot hole spacing, shaft diameter and flange dimensions. We cover mechanical compatibility in mechanical compatibility when moving to an IE4 motor: are frame, foot and shaft the same? and the shaft diameter and frame table in shaft diameter and frame table in motors (IEC 56-355). Staying within standard frame-shaft combinations is the safest way for fast supply from stock.

Knowing when the IE4 threshold applies in applications such as pumps, fans and compressors also determines the correct power selection and therefore the correct stock item. We cover this in the IE4 threshold in pumps, fans and compressors and the return on replacing an old motor with IE4 in what does replacing your old motor with IE4 deliver?. When you choose a standard IE4 motor at the right power and speed, you gain both fast supply from stock and the long-term efficiency advantage together.

Order Tips for Fast Delivery

The most practical way to get fast supply from stock is to stay within standard combinations: a standard kW step, 2 or 4 poles, B3/B5/B35 mounting and standard 400 V / 50 Hz voltage-frequency. Clearly stating the machine's real requirement when ordering prevents the wrong motor arriving; especially if you are replacing an old motor, you must match exactly using the nameplate data. We cover this in prevent the wrong motor arriving: nameplate matching and nameplate and label reading in IE4 electric motors.

If you are replacing an old brand with an equivalent, verifying IEC connection dimension compatibility in advance speeds up delivery. You can find equivalent selection in replacing an IE4 motor with an equivalent and direct replacement of an old brand motor. We cover which powers should be kept as spares in stock planning in critical spare motor list. You can reach our full IE4 motor range from our homepage.

Frequently Asked Questions

Which IE4 powers really move fast from stock?

The fastest-supplied band is the standard steps between 0.75 and 200 kW (such as 0.75 - 1.5 - 2.2 - 4 - 5.5 - 7.5 - 11 - 15 - 22 - 30 - 37 - 45 - 55 - 75 - 90 - 110 - 132 - 160 - 200 kW). At these powers, 4-pole and 2-pole motors in particular are densely stocked. Very small (0.25-0.55 kW) and very large (250-355 kW) powers, along with some low-speed combinations, may require longer lead times.

Is 2-pole or 4-pole easier to find?

Both are the most stocked speeds, but it depends on the application. 4-pole (1500 rpm) is the most common for conveyors, gearboxes and general drives; 2-pole (3000 rpm) is the most sought speed for pumps, fans and compressors. The stock depth of 6 and 8-pole low-speed motors is more limited and may be made to order at some powers.

How long is the lead time for an IE4 motor not in stock?

Lead time varies with power, speed and special requests. If a standard combination is out of stock it can often be completed in a relatively short time, while very large power, exproof, special voltage/frequency, brake or specially painted versions may take longer. For the right expectation, we recommend stating all technical requirements clearly before ordering; our team shares current stock and lead-time information with you.

Get a Quote

Share the kW, speed, mounting type and any special requirements you need with us; let us evaluate together which options are available fast from stock and the realistic lead time. For fast delivery and the right IE4 motor selection, call us at +90 (532) 345 49 86 or send your request via our contact page. Sharing your existing motor nameplate makes the correct match and fast shipment easier.

Order and Stock Checklist

  • Round your required kW to a standard step; intermediate powers can extend lead time.
  • Clarify speed/pole: 2 and 4 poles are stocked fastest, 6/8 poles more limitedly.
  • Determine the mounting type (B3/B5/B35); these most common ones are supplied from stock.
  • Stay at standard voltage/frequency (400 V / 50 Hz); special values are made to order.
  • State exproof, brake, external fan or special paint requests up front; these have long lead times.
  • If replacing an old motor, match exactly using the nameplate data.
  • Plan lead time and shipping in advance for project-based bulk purchases.
  • Confirm current stock status and delivery time before ordering.