Mersen Surge arrester

Mersen surge arrester STMZT12-7K255V-3P

Manufacturer: Mersen
Designation: Surge arrester type 1+2 7kA Uc 255V
Type: STMZT12-7K255V-3P
Mains type DC: No
Mains type IT: No
Mains type TN: No
Mains type TN-C: Yes
Mains type TN-C-S: No
Mains type TN-S: No
Mains type TT: No
Mains type other: No
Lightning impulse current (10/350 µs): 7.5 kA
Maximum continuous voltage AC: 255 V
Rated voltage AC: 400 V
Protection level: 1.5 kV
Protection level L-N: 1.5 kV
Protection level L-PE: 1.5 kV
Consecutive current quenching capacity: 25 kA
Max. overcurrent protection device V-voltage: 1.5 kV
Overcurrent protection device V-wiring (fuse): 160 A
Mounting type: Busbar
Size: 3 TE
Max. conductor cross-section rigid (single): 50 mm²
Max. conductor cross-section flexible (fine-stranded): 35 mm²
Remote signalling: No
Signalling on the device: Optical
Test class: Type 1 and 2
Integrated back-up fuse: No
Energy-coordinated protection to the end device: Yes
Voltage-switching spark gap technology: No
Protection class (IP): IP30

Further details: Surge arrester type 1+2 7kA Uc 255V, according to EN 61643-11 for the 40mm busbar system in the meter panel, with spark gap technology, energetically coordinated protection to the end device (equal to less than 5m) type 1+2+3 for TNC systems (circuit variant 3+0). Function control via push-button with indicator light, switch-off electrical to 35 A gL/gG fuses up to 25kAeff short-circuit current, lightning current (10/350): 22.5 kA, rated leakage current (8/20): 20/60kA, protection level: equal to less than 1.5kV, protection class: IP20, for use in the main power supply system in residential buildings without external lightning protection (also with feeder).