Instrumentum tutelae contra impetus (SPD) est instrumentum necessarium ad tutelam contra fulmina apparatuum electronicorum. Adhibetur ad limitandam tensionem maximam instantaneam lineae electricae et lineae transmissionis signorum ad ambitum tensionis quem apparatus vel systema tolerare potest, vel ad limitandam tensionem maximam fulminis in terram influendam ad apparatum vel systema protectum ab impactu et damno.
| IEC Electrica | CL | 275 | CCCXX | 385 | 440 | ||
| Tensio AC Nominalis (50/60Hz) | 120V | 230V | 230V | 230V | 400V | ||
| Maxima Tensio Operativa Continua (AC) | (LN) | Uc | 150V | 275V | 320V | 385V | 440V |
| (N-PE) | Uc | 255V | |||||
| Currens Emissionis Nominalis (8/20μs) | (LN)/(N-PE) | In | 10kV/10kA | ||||
| Maxima Currens Exonerationis (8/20μs) | (LN)/(N-PE) | Imax | 20kA/20kA | ||||
| Gradus Protectionis Tensionis | (LN)/(N-PE) | Up | 0.6kV/1.5kV | 1.3kV/1.5kV | 1.5kV/1.5kV | 1.5kV/1.5kV | 1.8kV/1.5kV |
| Sequere Aestimationem Interruptionis Currentis | (N-PE) | Si | Centum Arma | ||||
| Tempus Responsionis | (LN)/(N-PE) | tA | <25ns/<100ns | ||||
| Fusus Subsidiarius (max) | 125A gL/gG | ||||||
| Cursus Brevis Circuitus Aestimatus (AC) | (LN) | ISCCR | 10kA | ||||
| TOV Resistere 5s | (LN) | UT | CLXXXV | 335V | 335V | 335V | 580V |
| TOV 120 min. | (LN) | UT | 230V | 440V | 440V | 440V | 765V |
| modus | Resistere | Defectus Tutus | Defectus Tutus | Defectus Tutus | Defectus Tutus | ||
| TOV resistit 200ms | (N-PE) | UT | 1200V | ||||
| Ambitus Temperaturae Operativae | -40°F ad +158°F [-40°C ad +70°C] | ||||||
| Humiditas Operativa Permissa | Ta | 5%…95% | |||||
| Pressio atmosphaerica et altitudo | RH | 80k Pa..106k Pa/-500m..2000m | |||||
| Torques Cochleae Terminalis | Mmax | 39.9 lbf-in [4.5 Nm] | |||||
| Sectio Transversa Conductoris (max) | 2 AWG (Solidum, Filum) / 4 AWG (Flexibile) | ||||||
| 35 mm² (Solidum, Filum) / 25 mm² (Flexibile) | |||||||
| Montatio | Ferrivia DIN 35 mm, EN 60715 | ||||||
| Gradus Protectionis | IP 20 (intus) | ||||||
| Materia Domus | Thermoplasticum: Gradus Extinctionis UL 94 V-0 | ||||||
| Protectio Thermalis | Ita | ||||||
| Status Operandi / Indicatio Culpae | Viridis bene / Ruber vitium | ||||||
| Contactus Remoti (RC) / Capacitas Commutationis RC | Facultativum | ||||||
| Sectio Transversa Conductoris RC (max) | AC:250V/0.5A;DC:250V/0.1A;125V/0.2A;75V/0.5A | ||||||
| 16 AWG (Solidum) / 1.5 mm² (Solidum) | |||||||