PROTECTION BOX SINGLE-PHASE AND THREE-PHASE

PERTURBATIONS ON THE MAINS NETWORK HAVE DIFFERENT ORIGINS, BUT TRANSIENT OVER VOLTAGES ARE THE MOST DANGEROUS BECAUSE MOST OF THE ELECTRIC EQUIPMENT RISKS SERIOUS DEGRADATIONS.

A COMPLETE PROTECTION WITH THE CONTINUITY OF SERVICE AND THE SYSTEM SECURITY CAN BE ONLY INSURED WITH A PRODUCT LIKE THE SUPTRANS : THE GUARANTY OF A VERY LOW RESIDUAL VOLTAGE IN CASE OF A SHOCK.

BUT THE PROTECTION BY A SUPTRANS IS AN EXPENSIVE INVESTMENT FACE TO THE MATERIAL, AND THE CONTINUITY OF SERVICE IS NOT ALWAYS A PRIORITY.

THERE ARE PRODUCTS BEARING HIGH TRANSIENT OVER VOLTAGES THANKS TO THEIR HARDINESS. in all cases, PROTECTION BOXES 2P, 3P, 4P, 6P, 8P 9P AND 10P ARE AN EFFICIENT AND A RELIABLE SOLUTION, ALLOWING THE LIMITATION OF OVER VOLTAGES EFFECTS ON THE INSTALLATIONS.

Single-phased box

Three-phased box

PRINCIPLE : The principle of the protection boxes is very simple : It consists on placing between each phase (or neutral) and the ground, a component with non-linear characteristics.

The protection box will take place between the equipment to protect and the mains distribution. These components are varistors with great flowing. During a shock, the internal resistance of the varistor decreases highly to a value of less than 0.1 Ohm, making a preferential link of the current to the earth.

The residual over voltage remains less than 2500V with a current which can reach the value of 40000 A. When the over voltage has ended, the varistor recovers an internal resistance quite infinite, and a very low capacity , and then the installations running is not perturbed.

The response time of the varistor is quite instantaneous, less than 10-9 second, making it the more efficient component for this application. After a very important shock (> 40 000A), or when the varistors are in end of life, the varistors make a short-circuit, releasing the circuit-breakers of the installations or the one placed before the protection box.

The advantages are numerous :

One model for all powers
Small dimensions and low weight
Easy connecting
Response time

INTRODUCING : The protection boxes have three parts : A ground terminal, where the earth is connected, electrically linked to the bottom plate made of aluminium. Fuse-isolators with neutral tubes. The varistors allows to insulate during a control or a substitution without cutting the power source. The box (with cable glands on your request, if you specify the cables section --> IP 55) is made of polycarbonate, with a transparent cover. This box has four fixing plugs.

OPTIONS ( NFC 61740 ) : All the protection boxes can be equipped with varistors including end of life disconnecting device. The disconnection of these components is signalled on isolated dry contact.

Feel free to contact us for specific requirements