Phoenix Contact, VAL-MS 400 ST Surge Suppressor Unit 385 V ac Maximum Voltage Rating 40kA Maximum Surge Current

The 2798844 from Phoenix Contact is a type 2 surge protection plug. This plug is designed to protect low voltage or three phase power supplies in your installations. It's backed with thermal monitoring, easy pluggable design that’s allow for simple maintenance, mechanical indicator that shows the status and a wiring bridge that allows multiple modules to easily connect and be bridged on the ground connection. VALVETRAB provides L-N and L-PEN protection.

e 2 base element - 445-5252, 220-3627

Choose this surge arrester from Phoenix Contact to keep your electronic systems and devices protected from over-voltage. It's suitable for single-phase power-supply systems with TN (terre-neutral) and TT (terre-terre) type earthing. It's a Type 2 SPD (surge protection device), which means it protects against damage from indirect lightning strikes or switching operations.
The surge protector can be mounted onto any standard DIN rail for ease of installation. A clear optical display lets you identify errors, while its pluggable design makes it simple to maintain. Thanks to the unit's wiring bridge, you can connect multiple modules and ground all the connections in your distribution board.
This unit is rated IP20 when all terminal points are used, which means it's touch-proof and resistant to dust. To make sure it's safe, this component has been rigorously tested for reliability by the manufacturer.

• Maximum surge current of 40 kA
• Maximum voltage rating of 385 V AC
• Operating temperature range of -40°C to +80°C
• Dimensions of 89.8 (length) x 35.6 (height) x 65.7 mm (depth)
• Protective plug suppressor type

Voltage surges, often referred to as spikes or transients are typically caused by switching of fluorescent lights, fuses blowing or nearby lightning activity. The worst voltage spikes are usually caused by lightning strikes and can reach up to 6000V, with current surges of over 3000A. The maximum size of the let-through voltage and current inrush depends on the location within the building's wiring system. BS7671: 2011 Amendment 1 Sections 443 and 534 cover risk assessment and provides guidance on protection of electronic equipment for installation engineers to follow. The fullest information on lightning and surge protection comes from the BSEN 62305 series of standards.