| IEC Electrical | 75 | 150 | 275 | 320 | 385 | 440 |
| Nominal AC Voltage (50/60Hz) | Uo/ Un | 60V | 120 V | 230 V | 230 V | 230 V | 400 V |
| Maximum Continuous Operating Voltage (AC) | Uc | 75V | 150 V | 275 V | 320 V | 385 V | 440 V |
| Nominal Discharge Current (8/20 μs) | In | 20 kA | 20 kA | 20 kA | 20 kA | 10 kA | 10 kA |
| Maximum Discharge Current (8/20 μs) | Imax | 50 kA | 50 kA | 50 kA | 50 kA | 50 kA | 50 kA |
| Impulse Discharge Current (10/350 μs) | Iimp | 12.5 kA | 12.5 kA | 12.5 kA | 12.5 kA | 10 kA | 10 kA |
| Specific Energy | W/R | 39 kJ/Ω | 39 kJ/Ω | 39 kJ/Ω | 39 kJ/Ω | 25 kJ/Ω | 25 kJ/Ω |
| Charge | Q | 6.25 As | 6.25 As | 6.25 As | 6.25 As | 5 As | 5 As |
| Voltage Protection Level | Up | 0.7 kV | 1 kV | 1.5 kV | 1.6 kV | 1.8 kV | 2 kV |
| Response Time | tA | < 25 ns |
| Back-Up Fuse (max) | 315 A / 250 A gG |
| Short-Circuit Current Rating (AC) | lSCCR | 25 kA / 50 kA |
| TOV Withstand 5s | UT | 114 V | 180V | 335V | 335V | 335V | 580V |
| TOV 120min | UT | 114 V | 230V | 440V | 440V | 440V | 765V |
| | mode | Withstand | Safe Fail | Safe Fail | Safe Fail | Safe Fail | Safe Fail |
| UL Electrical | |
| Maximum Continuous Operating Voltage (AC) | MCOV | 75 V | 150 V | 275 V | 320 V | 385 V | 440 V |
| Voltage Protection Rating | VPR | 300 V | 600 V | 900 V | 1200 V | 1350 V | 1500 V |
| Nominal Discharge Current (8/20 μs) | In | 20 kA | 20 kA | 20 kA | 20 kA | 20 kA | 20 kA |
| Short-Circuit Current Rating (AC) | SCCR | | | | | | |
| | | 100 kA | 200 kA | 150 kA | 150 kA | 150 kA | 200 kA |
| Mechanical & Environmental | | |
| Operating Temperature Range | Ta | -40ºF to +158ºF [-40ºC to +70ºC] |
| Permissible Operating Humidity | RH | 5%...95% |
| Atmospheric pressure and altitude | 80k Pa ... 106k Pa / -500 m.....2000 m |
| Terminal Screw Torque | Mmax | 39.9 Ibf ·in [4.5 Nm] |
| Conductor Cross Section (max) | 2 AWG (Solid, Stranded) / 4 AWG (Flexible) |
| | 35 mm2 (Solid, Stranded) / 25 mm2 (Flexible) |
| Mounting | |
| | 35 mm DIN Rail, EN 60715 |
| Degree of Protection | IP 20 (built-in) |
| Housing Material | Thermoplastic: Extinguishing Degree UL 94 V-0 |
| Thermal Protection | Yes |
| Operating State / Fault Indication | Green ok / Red defect |
| Remote Contacts (RC) RC Switching Capacity RC Conductor Cross Section (max) | Optional AC: 250V / 0.5 A; DC: 250V / 0.1 A; 125 V / 0.2 A; 75 V / 0.5 A 16 AWG (Solid) / 1.5 mm2 (Solid) |
LY1-B 12.5: Surge Protection, type 1+2 to EN 61643-11 with visual function display. For interface 0 to 2 (LPZ) in accordance with lightning protection zone concept to IEC 61312-1 . • Arresting capacity 12.5 kA (10/350 µs) per pole • Power consumption < 26 mW/pole • Protection level < 1.5 kV, allows device protection • Line follow current quenching 25 kA Ipeak • lncl. plug caps for labelling the connections • Encapsulated, non-extinguishing spark gap • Can be used in standard distributor housings