This device consists of two forged brass clamps with screw tightening and an extra flexible copper cable coated with transparent silicon. It is used for doing a short circuit between two rails, signalling the presence of personnel along a specific area of the railway line.
Optional: plastic box for transporting it easily.
| Model | Short circuiting and continuity with clamps | |
| Clamps number | nr | 2 clamps made by press forged brass |