PHOENIX CONTACT VAL-MS 320/3+1/FM 2859181

Phoenix Contact VALVETRAB Surge Protective Device

Description

This is the VAL-MS 320/3+1/FM, a Type 2 surge arrester from Phoenix Contact. It provides reliable protection for three-phase power systems against transient overvoltages. The modular design, featuring a base element and plug-in protective elements, ensures easy installation and maintenance. A key feature is the integrated floating remote indication contact, allowing for seamless integration into system monitoring and control setups.

Specifications

• Manufacturer: Phoenix Contact
• Model: VAL-MS 320/3+1/FM
• Part Number: 2859181
• Nominal Voltage: 240/415V AC (TN-S and TT systems)
• IEC Test Classification: II, T2
• Maximum Continuous Voltage (Uc): 335V AC (L-N/L-PE), 260V AC (N-PE)
• Nominal Discharge Current (In, 8/20 microseconds): 20 kA
• Total Discharge Current (Itotal, 8/20 microseconds): 80 kA
• Mounting: DIN rail NS 35

Label Info

• Base: VAL-MS 320/3+1/FM, No. 2859181
• Plugs (3x): VAL-MS 320 ST, Uc: 335V AC, Up: 1.5 kV, In: 20 kA
• Plug (1x): F-MS 12 ST, Uc: 260V AC, Up: 1 kV, Imax: 40 kA

Application

Ideal for installation in main and sub-distribution boards to protect electrical installations and equipment in industrial facilities, commercial buildings, and data centers from the damaging effects of lightning-induced surges and switching overvoltages.

Country of Origin

Made in Germany.

CO2 Impact

Opting for this pre-owned component avoids the emission of approximately 16 kg of CO2, which is comparable to the emissions from a 80 km car journey. Your purchase supports a circular economy and reduces industrial waste.

Availability

This item is in stock and ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

What does the “3+1/FM” designation in VAL-MS 320/3+1/FM mean?

The “3+1” indicates its application in a three-phase system with a neutral conductor (L1, L2, L3 + N). It provides protection between Line-Neutral and Neutral-Earth. The “FM” stands for Floating remote contact, which is a signaling contact to monitor the status of the protective device remotely.

Are the protective plugs on this device individually replaceable?

Yes, a key feature of the VALVETRAB MS series is its modular design. Each protective plug (VAL-MS 320 ST and F-MS 12 ST) can be removed and replaced individually without disconnecting the wiring, simplifying maintenance.

What is the visual indication for a faulty protective plug?

Each plug has a small window that provides a visual status indication. A green indicator means the plug is functional. If the plug has been overloaded and is no longer providing protection, the indicator will turn red.

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Last Update: Friday, March 13, 2026