Horizontal Double Mounting Siren
Three Phase, 400/440 Volts, 2880 R.P.M., 50 Cycles, A.C.
| Audible Diametrical Range | H.P. | Model |
| 0.25 km. | 41647 | J3D – 25 |
| 0.50 km. | 41643 | J3D – 50 |
| 1.00 km. | 41641 | J3D – 100 |
| 1.50 kms.- | 1 | J3D – 150 |
| 2.00 kms.- | 1.5 | J3D – 200 |
| 3.50 kms.- | 2 | J3D – 350 |
| 5.00 kms.- | 3 | J3D – 500 |
| 8.00 kms.- | 5 | J3D – 800 |
| 11.50 kms. | 7.5 | J3D – 1150 |
| 16.00 kms. | 10 | J3D – 1600 |