Products & specifications

The eddy current retarder range, in full detail

Three bus & coach series (A, DX, F) and five truck series (AX9, AX8, AX7, AX5, AX3). Tables scroll sideways; torque bars are scaled to the range maximum of 3,800 N·m.

Bus & coach range · 400–2400 N·m

A Series

Light, compact twin-rotor design: low weight, low moment of inertia and low dynamic load — no impact on the driveline
Stable torque output
Versatile matching for a wide range of vehicles
Small footprint: the twin-rotor layout solves driveshaft packaging on small and mid-size vehicles
Cast alloy-steel rotors
Coils protected by a special heat-shrink material

A Series models and main specifications
Model	Torque (N·m)	Weight (kg)	Dimensions (mm) L×W×axial	Stator (kg)	Rotor (kg)	Inertia (kg·m²)	Current (A)	Vehicle length	Mounting
AX30-40	400	69	340×300×224	50	19	0.2	90	5–7 m	Mid-driveshaft
AX50-50	500	146	416×416×250	96	50	1.2	35	6–8 m	Mid-driveshaft
AX50-70	700	146	416×416×250	96	50	1.2	35	6–9 m	Mid-driveshaft
AX50-90	900	150	416×416×250	100	50	1.2	84	6–9 m	Mid-driveshaft
AX72-00	2000	240	526×526×311	160	80	2	128	10–11 m	Mid-driveshaft
AX72-40	2400	256	526×526×311	176	80	2	141	12–13 m	Mid-driveshaft

Bus & coach range · 1100–2400 N·m

DX Series

Light, compact twin-rotor design: low weight, low moment of inertia and low dynamic load — no impact on the driveline
Stable torque output
Versatile matching for a wide range of vehicles
Small footprint: the twin-rotor layout solves driveshaft packaging on small and mid-size vehicles
Cast alloy-steel rotors
Coils protected by a special heat-shrink material
Stator carrier die-cast from high-density aluminium alloy sourced from South America

DX Series models and main specifications
Model	Torque (N·m)	Weight (kg)	Dimensions (mm) L×W×axial	Stator (kg)	Rotor (kg)	Inertia (kg·m²)	Current (A)	Vehicle length	Mounting
DX1100	1100	108	480×476×185	68	40	0.55	110	8 m	Rear axle / gearbox
DX1300	1300	127	480×476×185	87	40	0.55	114	9 m	Rear axle / gearbox
DX1500	1500	135	526×524×197	86	49	1.65	124	9–10 m	Rear axle / gearbox
DX1700	1700	138	526×524×197	89	49	1.65	126	10–11 m	Rear axle / gearbox
DX1900	1900	182	542×540×240	116.6	65.4	1.9	123	11–12 m	Gearbox
DX2100	2200	185	542×540×240	119.6	65.4	1.9	142	12 m	Gearbox
DX2400	2400	188	542×540×240	122.6	65.4	1.9	159	12–13 m	Gearbox

Bus & coach range · 600–2600 N·m

F Series

Proprietary material technology — rotors meet endurance-test requirements
High-performance TLM retarder control electronics
CNC machining throughout
Cast alloy-steel rotors
Coils protected by a special heat-shrink material

F Series models and main specifications
Model	Torque (N·m)	Weight (kg)	Dimensions (mm) L×W×axial	Stator (kg)	Rotor (kg)	Inertia (kg·m²)	Current (A)	Vehicle length	Mounting
FC50-60	600	90	410×410×179	61.5	28.5	0.5	40	6–7 m	Rear axle / gearbox
FC61-00	1000	99	463×463×182	59	40	0.55	112	8 m	Rear axle / gearbox
FC61-20	1200	101	463×463×182	61	40	0.55	127	9 m	Rear axle / gearbox
FC71-40	1400	126	516×516×180	77.3	48.7	1.64	136	9–10 m	Rear axle / gearbox
FC71-65	1650	131	516×516×180	82.3	48.7	1.64	138	10–11 m	Rear axle / gearbox
FN71-95	1900	172	516×516×242	106.6	65.4	2.33	143	10 m	Gearbox
FN72-20	2200	174	516×516×242	108.6	65.4	2.33	155	11 m	Gearbox
FN72-40	2400	181	516×516×242	115.6	65.4	2.33	158	12 m	Gearbox
FN72-60	2600	184	516×516×242	118.6	65.4	2.33	171	12–13 m	Gearbox

Truck range · 3800 N·m

AX9 Series

The AX93-80 is the upgrade of the AX8 series: optimised shaft design with a reliable anti-loosening structure, fully imported bearings, a thicker bent-and-welded stator plate, higher-grade heat-resistant materials and a distinctive rotor cooling-duct design — backed by a century of Telma know-how. With 3,800 N·m of braking torque and mid-driveshaft mounting, it provides auxiliary braking for 60–90 t 8×4 heavy trucks and wide-body mining trucks, improving braking safety and cutting operating costs.

AX9 Series models and main specifications
Model	Torque (N·m)	Weight (kg)	Dimensions (mm) L×W×axial	Stator (kg)	Rotor (kg)	Inertia (kg·m²)	Current (A)	Vehicle weight (GVW)	Vehicle type	Mounting
AX93-80	3800	309	630×630×356	187	122	4.88	200	60–90 t	8×4 heavy trucks / wide-body mining trucks	Mid-driveshaft

Truck range · 3000–3400 N·m

AX8 Series

Lighter, smaller, better performing
Purpose-designed rotor for lasting torque and lower losses
Optimised current design reduces electrical losses
Higher corrosion resistance
Modular design for a longer service life
Mid-driveshaft mounting for wide applicability

AX8 Series models and main specifications
Model	Torque (N·m)	Weight (kg)	Dimensions (mm) L×W×axial	Stator (kg)	Rotor (kg)	Inertia (kg·m²)	Current (A)	Vehicle weight (GVW)	Vehicle type	Mounting
AX83-00	3000	275	557×578×328	163	112	2.1	176	50–60 t	8×4 dump trucks, wide-body dump trucks	Mid-driveshaft
AX83-40	3400	279	557×578×328	167	112	2.1	200	60–90 t	8×4 dump trucks, wide-body dump trucks	Mid-driveshaft

Truck range · 2000–2600 N·m

AX7 Series

Lighter, smaller, better performing
Purpose-designed rotor for lasting torque and lower losses
Optimised current design reduces electrical losses
Higher corrosion resistance
Modular design for a longer service life
Mid-driveshaft mounting for wide applicability

AX7 Series models and main specifications
Model	Torque (N·m)	Weight (kg)	Dimensions (mm) L×W×axial	Stator (kg)	Rotor (kg)	Inertia (kg·m²)	Current (A)	Vehicle weight (GVW)	Vehicle type	Mounting
AX72-00	2000	229	526×526×311	149	80	2	114	15–30 t	4×2, 6×2 medium & heavy trucks	Mid-driveshaft
AX72-60	2600	232	526×526×311	152	80	2	168	30–50 t	6×2, 6×4 tractors and cargo trucks	Mid-driveshaft

Truck range · 700–1000 N·m

AX5 Series

Lighter, smaller, better performing
Purpose-designed rotor for lasting torque and lower losses
Optimised current design reduces electrical losses
Higher corrosion resistance
Modular design for a longer service life
Mid-driveshaft mounting for wide applicability

AX5 Series models and main specifications
Model	Torque (N·m)	Weight (kg)	Dimensions (mm) L×W×axial	Stator (kg)	Rotor (kg)	Inertia (kg·m²)	Current (A)	Vehicle weight (GVW)	Vehicle type	Mounting
AX50-70	700	130	416×416×250	80	50	1.2	64	2–8 t	Small & mid-size light trucks	Mid-driveshaft
AX51-00	1000	130	416×416×250	80	50	1.2	105	8–15 t	Large light trucks	Mid-driveshaft

AX5 vehicle weights refer to on-road vehicles; generally not used off-road.

Truck range · 400 N·m

AX3 Series

Compact, small and easy to install
Stable torque output
Versatile matching for a wide range of vehicles
Forged alloy-steel rotor
Coils in a special high-temperature material

AX3 Series models and main specifications
Model	Torque (N·m)	Weight (kg)	Dimensions (mm) L×W×axial	Stator (kg)	Rotor (kg)	Inertia (kg·m²)	Current (A)	Vehicle weight (GVW)	Vehicle type	Mounting
AX30-40	400	69	340×300×224	50	19	0.2	90	2–8 t	Small light trucks	Mid-driveshaft

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