Surge protective device type T1+T2, configuration 3+NPE, Limp: 12.5 kA (10/350), In: 30kA (8/20), Imax: 60kA, Uc: 255V AC RSP-T1T2-AC 12.5/3+NPE 2617124

Professional surge protection for three-phase systems

The T1+T2 type surge arrester is an advanced solution for comprehensive protection of AC installations against the effects of atmospheric discharges and surges. The RSP-T1T2-AC 12.5/3+NPE model provides simultaneous Class I (direct lightning strikes) and Class II (surges) protection.

The 3+NPE configuration enables effective protection of three phases plus an additional neutral conductor with PE function, which is particularly important in modern electrical installations requiring high-quality grounding.

Operating parameters and performance

The device features a peak current Limp of 12.5 kA with a 10/350 μs impulse, ensuring effective energy absorption during direct atmospheric discharges. The rated discharge current In is 30 kA with a standard 8/20 μs impulse, guaranteeing reliable operation during frequent surges.

The maximum discharge current Imax reaches up to 60 kA. The protection level Up ≤2 kV ensures effective voltage limitation to safe values for connected equipment. The response time ≤100 ms guarantees an instantaneous reaction to emerging surges.

Construction and installation

The compact enclosure measures 80×70×90 mm with a weight of only 0.37 kg, facilitating installation even in tight distribution boards. The device occupies 4 modules on a standard 35 mm DIN rail, enabling easy mounting in most electrical distribution boards.

The construction allows connection of:

• flexible stranded conductors up to 50 mm²
• rigid single-core or stranded conductors up to 35 mm²

The device is compatible with TT network systems and features optical and mechanical (blow-out) signaling indicating operational status and potential component wear.

Applications and standards

The surge arrester is specifically designed for protection of low-voltage equipment against atmospheric discharges and surges. Installations implemented according to lightning protection zone concepts operate in LPZ (Lightning Protection Zone) areas from 0 to the first.

Design is based on the rigorous requirements of standard IEC 61643-11:2011, guaranteeing the highest safety and reliability standards. TOV withstand capability is 355 V for five seconds.

The varistor-gas discharge tube construction ensures an optimal combination of the fast response of varistors with the high energy absorption characteristic of gas discharge tubes.