Phoenix Contact FLT-SEC-P-T1-3S-350/25-FM Type 1 Surge Arrester, 3-Phase, 350 V AC, 25 kA, DIN Rail 2905421

This Type 1 surge protective device from Phoenix Contact delivers robust protection for three-phase power systems against direct lightning strikes and transient overvoltages. With a total impulse discharge capacity of 75 kA (10/350 µs) and a voltage protection level of ≤1.5 kV, it safeguards sensitive equipment in industrial and commercial installations.

Advantages

The pluggable arrester design allows quick replacement without disconnecting the wiring, minimizing downtime. Its floating changeover contact enables remote monitoring of the device status, while the screw connection supports conductors up to 35 mm² for reliable, low-resistance terminations. The compact DIN rail housing fits standard NS 35 profiles, simplifying integration into existing distribution boards.

Suitable for

• Main distribution boards in industrial facilities
• Three-phase power supply systems (TN-S, TN-C, TT)
• Protection of inverters, motors, and control cabinets
• Applications requiring remote status signaling

Key specifications

• Arrester type: Type 1 / Class I per IEC 61643-11
• Nominal voltage: 230/400 V AC
• Max continuous operating voltage: 350 V AC
• Impulse current (10/350 µs) per pole: 25 kA
• Total impulse current: 75 kA
• Voltage protection level: ≤1.5 kV
• Response time: ≤100 ns
• Remote signaling: floating changeover contact
• Mounting: DIN rail NS 35/7.5 or NS 35/15
• Connection: screw terminals, 1.5–35 mm²
• Ingress protection: IP20
• Operating temperature: -40 °C to +80 °C

Recommendations

For optimal protection, install this arrester as close as possible to the service entrance and ensure proper equipotential bonding. Pair with Phoenix Contact Type 2 arresters downstream for a coordinated protection scheme in cascaded installations.