#  Hollow Coil Wire Winding Machine

Winding, leg bending, enamel stripping and cutting in a single cycle — engineered for the high-efficiency production of circuit breaker hollow coils.

- Suitable for instantaneous, undervoltage and shunt release coils and other circuit breaker hollow coils;
- Precisely controlled turn count (0.5–60 turns) for consistent resistance and ampere-turn characteristics;
- Leg bending at any angle from 0.1° to 359°, with multi-leg forming in one cycle;
- Servo rotary peeling or servo stamping for enamel removal — wire ends ready for soldering;
- Handles both round and flat wire, covering standard through high-current coil sizes.

 ![](https://www.viiju.com/images/products/parts-machines/coil-wire-winding/sample-wire-coils.webp)

 ![](https://www.viiju.com/images/products/parts-machines/coil-wire-winding/hollow-wire-coil-production.webp)

 ![](https://www.viiju.com/images/products/parts-machines/coil-wire-winding/hollow-wire-coil-machine-close-look.webp)

 ![](https://www.viiju.com/images/products/parts-machines/coil-wire-winding/hollow-wire-coil-machine-types.webp)

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Overview

 ![](https://www.viiju.com/media/yootheme/cache/b3/wire-feeder-b3c7f4c5.webp)

YF-60 wire feeder, 1–60 kg capacity, φ680 mm tray

##  Built for Circuit Breaker Coil Production

  Focused on the batch winding of bobbinless air-core coils

The instantaneous trip coils of moulded case circuit breakers, as well as undervoltage and shunt release coils, are mostly bobbinless air-core coils: enamelled wire is wound tightly into a ring, the two terminal legs must be bent to shape, and the enamel has to be stripped from the wire ends before soldering. These coils have few turns and relatively thick wire, but demand tight consistency in turns, resistance and leg forming accuracy — all of which directly determine whether the tripping characteristic of the breaker stays stable.

Manual or semi-automatic winding struggles to keep every coil identical: the process is spread across stations, output is low, and quality depends heavily on operator skill. This machine integrates the entire process chain into one unit and completes every step automatically after loading, making it the core equipment of a circuit breaker coil production line.

Wire Feeder

##  Core Technology and Configuration

One machine that takes the wire all the way to a finished coil

Four Steps, One Cycle

Winding, cutting, leg bending and enamel stripping are on a single machine — no transfer or re-fixturing between stations.

Full Servo Drive

Feeding, winding, cam, lifting and bending are each driven by an independent servo axis for accurate motion and stable repeatability.

Fast Changeover

Product programs are called upon the screen. Turns, bending angle and leg length are set in a touch, one minute switching products.

High Output

Output of 1–40 pcs per minute, freely adjustable to product requirements, so one operator can run several machines at once.

##  Wire Winding Machine Model Selection

| Parameter | YF-620 | YF-640Y | YF-840B |
|---|---|---|---|
| Wire diameter | φ0.7~2.5 mm | φ1.2~4.5 mm | Flat wire 3 mm²~25 mm² |
| Control system | 8-inch button touch screen | 10-inch button touch screen |
| Leg length stroke | 1~40 mm | 1~60 mm |
| Turns | 0.5~60 turns |
| Winding direction | Left and right rotation |
| Feeding length | 0.5~120 |
| Bending angle | 0.1~359° |
| Bending capability | Multi-leg bending capability |
| Multi-layer traverse    auxiliary stroke | 0.1~40 mm | — | — |
| Adjustable bend length | — | 0.1~40 mm |
| Cam shaft setting value | 0.1~359.9° |
| Lifting stroke | 1~40 mm | 0.1~80 mm |
| Enamel removal method | Servo rotary peeling | Servo stamping |
| Production rate per minute | 1~40 pcs (actual speed can be set according to product requirements) |
| Servo axis count | 6 axis | 8 axis |
| Feeding servo motor | 0.4 kW |
| Winding/Lifting servo motor | 0.75 kW | 2.0 kW |
| Cam servo motor | 0.9 kW | 3.0 kW |
| Auxiliary servo motor | 0.4 kW | — | — |
| bending servo motor | — | 0.75 kW |
| peeling servo motor | — | — | 0.75 kW |
| Power rating | 4.5 kW | 9 kW | 11 kW |
| Voltage specification | AC220V 50Hz | AC380V 50Hz |
| Dimensions (D×W×H) | 1750\*970\*1550 | 1850\*1100\*1950 |
| Weight | Approx. 550 kg | Approx. 1200 kg | Approx. 1300 kg |
| *Notes: 1) Rated power — actual power consumption is approximately half of the rated power.   2) “—” indicates the parameter is not applicable to that model.   3) Parameters are quoted as printed in the original brochure.* |