P-94: Reliability, Safety, and Performance in Medium Voltage
The P-94 switch-disconnectors are designed for overhead distribution networks up to 36 kV, providing an efficient and safe solution for managing and maintaining electrical infrastructures. Ideal for isolating network sections after permanent faults or facilitating downstream interventions, they ensure swift and reliable operation at all times.
Why choose the P-94?
✅ Maximum durability – Robust and simple construction, designed for extreme outdoor conditions.
✅ Safe insulation – Large disconnection distance and optimized creepage distance for enhanced performance.
✅ Total safety – Excellent behavior against short-circuit currents, ensuring reliability in critical situations.
✅ Visibility and control – Design allows clear identification of the open position, improving operational safety.
Operating principle
In its closing sweep, the whip spring is not hooked until the moment the mobile blade has made perfect contact with the stationary blade.
In its opening sweep, the whip is rapidly released, a classic feature of this type of equipment, but unlike the conventional system, it is slowed down at the end of its travel by the expansion of the coils previously tensed in the closing sweep.
Thanks to the considerable angular displacement of the whip, its end quickly travels a distance that is far superior – under equal conditions – to the distance travelled by the whips of classic systems. The breaking capacity achieved in this way is clearly superior and the duration of the electric arc is very brief.
Mechanical specifications
Frame and remaining metal parts in hot dip galvanized steel in compliance with UNE ISO 1461.
Articulation by means of bronze-aluminium bushings.
Nuts and bolts and metal parts in galvanized steel and stainless steel.
Brown C4-250 porcelain insulators, in compliance with CEI 672, with cast iron fittings.
Grey polymeric insulators UNE 21.909 with a fibreglass core and cast iron fittings.
Hardened copper blade, open profile, silver plated on the contact surface.
Optionally, epoxy and polyurethane paint on galvanized steel for guaranteed resistance in marine environments.
Electric specifications
| 24kV | 36kV | |||
| P-94 | P-94P | P-94 | P-94P | |
| Rated voltage Ur kV | 24 | 36 | ||
| Rated current Ir r A | 400 | |||
| Breaking capacity 50 operations A | 100 | |||
| Rated frequency fr Hz | 50 | |||
| Test voltage at 50Hz. kV | 50 | 110 | 70 | 150 |
| Lightning impulse withstand voltage kV | 125 | 180 | 170 | 235 |
| Rated short-time withstand current Ik kA | 10 | |||
| Dynamic limit kA | 25 | |||
| Insulator creepage distance mm | 656 | 780 | 925 | 975 |
| Weight kg | 119 | 90 | 144 | 92 |
Dimensions
| P-94 kV / 400 A | 270 mm |
| P-94P 24 kV / 400 A | 305 mm |
| P-94 36 kV / 400 A | 405 mm |
| P-94P 36 kV / 400 A | 385 mm |
References
| Code | Description | ET ENDESA |
| 0400000 | Disconnector III Type P-94 24kV/400A standard without drive | |
| 0300000 | Switch III Type P-94 24kV/400A standard without drive | |
| 0420000 | • Switch III Type P-94P 24kV/400A standard without drive | |
| 0430000 | • Switch III Type P-94P 24kV/400A with Endesa Type drive | |
| 0410000 | • Switch III Type P-94Psp 24kV/400A special without drive | 6779441 |
| 0500000 | Switch III Type P-94 36kV/400A standard without drive | 6700517 |
| 0510000 | Switch III Type P-94 36kV/400A with Endesa Type drive | 6700517/6700520 |
| 0520000 | Switch III Type P-94 36kV/400A with HV drive and T.M.V. fitting | |
| 0600000 | • Disconnector III Type P-94P 36kV/400A standard without drive | |
| 0610000 | • Switch III Type P-94P 36kV/400A with Endesa Type drive | |
| 0620000 | • Switch III Type P-94P 36kV/400A with HV drive and T.M.V. fitting |
(•) Devices with polymeric insulator