100L Frame Motors: Power, Speed, Sizes

DRG Motor offers four electrical models in the IEC 100L frame: a 2-pole 3 kW (DRG-100L-2), two 4-pole models — DRG-100L1-4 at 2.2 kW and DRG-100L2-4 at 3 kW — and a 6-pole 1.5 kW (DRG-100L-6). Each comes with an aluminium or a cast iron frame; the shaft is 28 × 60 mm, shaft height 100 mm, and the B5 flange has a 250 mm outside diameter, 180 mm spigot and 215 mm bolt circle. All four are wound for 230/400 V.

Grey DRG three-phase induction motor — article on 100L frame motors

To look at these motors one by one, visit the DRG online motor shop; the full three-phase range is on the three-phase asynchronous electric motors page, and the lighter frames are grouped under aluminium housing motors.

Which DRG models use the 100L frame?

100L is the IEC frame with the shaft axis 100 mm above the feet and the "L" (long) body length. DRG has four types in it, covering all three speed classes: 1000, 1500 and 3000 rpm. The links in the table open the aluminium product pages.

Model (aluminium)	Power	Speed class / rated speed	Current at 400 V
DRG-100L-2	3 kW (4 HP)	3000 rpm class / 2895 rpm	5.71 A
DRG-100L1-4	2.2 kW (3 HP)	1500 rpm class / 1450 rpm	4.52 A
DRG-100L2-4	3 kW (4 HP)	1500 rpm class / 1450 rpm	6.02 A
DRG-100L-6	1.5 kW (2 HP)	1000 rpm class / 949 rpm	3.59 A

The cast iron versions of the same four types: DRG-100L-2-GG, DRG-100L1-4-GG, DRG-100L2-4-GG, DRG-100L-6-GG. In the product records, power, rated speed, current, torque and B3 dimensions are the same for both materials; the choice depends on the operating environment and on what is already installed on site. For the material differences, see aluminium vs cast iron housing.

100L1 and 100L2: two different 4-pole motors in one frame

This is where most 100L searches go wrong. In the 1500 rpm class this frame carries two outputs, and DRG separates them with a 1 or 2 after the frame code: DRG-100L1-4 = 2.2 kW, DRG-100L2-4 = 3 kW. The product records list the same shaft, foot, frame diameter and overall length for both, so you cannot tell them apart from the outside. The nameplate makes the difference: 4.52 A against 6.02 A at 400 V, and 14.5 Nm against 19.8 Nm.

In practice: if the old nameplate only says "100L" and the motor is 4-pole, read the power before ordering. Taking 3 kW instead of 2.2 kW changes the overload setting and cable sizing; taking 2.2 kW instead of 3 kW overloads the motor. The flanged options are covered by power in our 2.2 kW flange motor and 3 kW flange motor: 100L and 132S articles, so we do not repeat those details here.

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2-pole and 6-pole: same shaft, very different torque

All four 100L models carry a 28 × 60 mm shaft. Because the shaft is identical, "any of them will fit" is a misleading idea: the machine needs a given speed and torque. Rated torque is T = 9550 × P / n; for DRG-100L2-4: 9550 × 3 / 1450 ≈ 19.8 Nm.

Model	Poles	Power / rated speed	Rated shaft torque
DRG-100L-2	2	3 kW / 2895 rpm	9.9 Nm
DRG-100L1-4	4	2.2 kW / 1450 rpm	14.5 Nm
DRG-100L2-4	4	3 kW / 1450 rpm	19.8 Nm
DRG-100L-6	6	1.5 kW / 949 rpm	15.1 Nm

Two lessons follow. First, at the same 3 kW the 2-pole DRG-100L-2 gives about 9.9 Nm while the 4-pole DRG-100L2-4 gives 19.8 Nm — roughly 2 times more. Second, the 6-pole DRG-100L-6 is only 1.5 kW, yet with 15.1 Nm it delivers slightly more torque than the 14.5 Nm of DRG-100L1-4. That is why 6 poles suit slow conveyors or mixers with a low pulley ratio, while for fans and pumps the speed curve decides. When changing pole count, recalculate the pulley or gearbox ratio with the electric motor calculator.

100L foot-mounted (B3) and shaft dimensions

The B3 dimensions in the product records are the same for all four models and both frame materials:

Dimension	Meaning	Value
H	Shaft centre height	100 mm
A × B	Foot hole spacing (across × along)	160 × 140 mm
K	Foot hole	4–Φ12 mm
C	Shaft shoulder to nearest foot hole centre	63 mm
D × E	Shaft diameter × shaft length	28 × 60 mm
F	Key width	8 mm
AC / AD	Frame diameter / axis to top of terminal box	205.4 / 166 mm
L	Overall length	406 mm

Bearing record: 6206-ZZ-C3. To compare the shaft with other outputs, see the motor shaft diameter by kW table; to check on a drawing, use the DRG 2D technical drawings.

100L B5 flange dimensions: read the four values separately

The DRG catalogue has a single B5 row for 100L, shared by 2-, 4- and 6-pole motors. When matching a flange, check outside diameter, spigot, bolt circle and hole diameter one by one:

Dimension	Meaning	100L B5 value
P	Flange outside diameter	250 mm
N	Spigot (pilot) diameter	180 mm
M	Bolt circle diameter	215 mm
S	Flange hole diameter	14.5 mm
T	Spigot depth	4 mm
LA	Flange thickness	13 mm
G / DH	Key seat depth dimension / shaft end thread	24 mm / M10×22

In the catalogue B5 row the overall length is 406 mm and the shaft is again 28 × 60 mm. The B5 values of every frame are collected in the B5 motor flange dimensions table.

The DRG catalogue has no B14 (small flange) dimension table, so we give no B14 dimensions here and do not claim that B14/B34 is ready for 100L. If you need B14 or B34, send the flange outside diameter, bolt circle, spigot diameter and thread size via WhatsApp and we will confirm. For background, see the B14 flange motor ordering guide and B34 ordering dimensions.

230/400 V: the wiring advantage of 100L

At DRG, motors up to 3 kW are wound for 230/400 V and motors of 4 kW and above for 400/690 V. The largest output in 100L is 3 kW, so every model in this frame is rated 230/400 V (Δ/Y): star (Y) on a 400 V line-to-line supply, delta (Δ) on a 230 V line-to-line supply. Star-delta starting on 400 V needs a 400/690 V winding, so for 100L motors on 400 V plan direct-on-line starting or a drive. One power step up, the winding voltage changes; recheck the starting method.

The 400 V currents are in the table; for cable sizing use the motor cable size calculator, and to compare with other outputs the motor current chart. The product record lists the cable entry as 1 × M25×1.5.

Dimensions to confirm before ordering

Poles and power: is the nameplate speed ~2895, ~1450 or ~949 rpm; if 4-pole, is it 2.2 kW or 3 kW?
Shaft: 28 mm diameter, 60 mm length, 8 mm key; coupling or pulley hub must match.
Foot mounting: hole spacing 160 × 140 mm, hole 4–Φ12 mm, shaft height 100 mm, C = 63 mm.
Flange mounting: P 250, N 180, M 215, S 14.5 mm; all four must match the mating part.
Cable entry and terminal box: the product record shows 1 × M25×1.5, the catalogue B5 row 1–M32×1.5; AD is 166 mm in the product record and 173.5 mm in the B5 row. If space is tight, confirm these with us before ordering.
If it drives a gearbox: frame size alone is not enough. The gearbox input flange (P/N/M), input bore (28 mm?), key and permitted load must be checked against the gearbox maker's data. More in choosing a flange motor for a gearbox.

Frequently asked questions

How do I tell 100L1-4 from 100L2-4?

Not by measuring — their listed dimensions are the same. Check the nameplate power (2.2 or 3 kW) and the 400 V current (4.52 or 6.02 A).

Can a 4-pole 100L replace a 2-pole 100L?

Shaft and flange match, but speed roughly halves (2895 → 1450 rpm). Pump or fan flow drops; on a belt drive the ratio must be recalculated.

Will a 100L motor run on a 230 V three-phase supply?

Yes, all four models are wound 230/400 V (Δ/Y); on a 230 V line-to-line supply they are connected in delta. Single-phase 230 V is another matter: these are three-phase motors.

Is there a B14 flange version in 100L?

The DRG catalogue has no B14 dimension table. If you need one, send the flange dimensions of the mating part and we will confirm.

Send a photo of your current motor's nameplate, the shaft diameter and length, and for a flange motor the P, N, M and hole diameter; we will pick the right 100L model together.

Send a photo of your current motor nameplate and we will find the suitable DRG model together.Send on WhatsApp

See the four 100L frame models and their current prices in the shopSEE PRICES

Electric Motors Related to This Topic — Models and Current Prices

Suitability is not decided by power alone: compare the speed, voltage, mounting, shaft and fixing dimensions of your machine with the product data; if unsure, send us the nameplate of your current motor.