ABB

SPD Class I
High discharge capacity

OVR type 1 and type 1+2 are designed to discharge high current surges without any destruction of the installation. This surge protective device is chararcterized by its capacity to withstand impulse current with 10/350 µs wave form which simulate direct impact coming from a natural lightning current. Type 1 and Type 1+2 SPDs are placed at the entrance point of the installation, in the main distribution board for a global protection of this installation. 

Main benefits
 The impulse current of 25kA per pole (10/350 µs wave) satisfies all requirements for overvoltage surge protection
 The early creation of the electric arc by its electronic ignition device reduces the protection level Up to an optimum value of 2,5kV
 OVR T1 SPDs contain a dedicated arc chamber for extinguishing the electrical arc following the discharge, they can open short circuits up to 50kA without using back up protection.

Main features
 limp 25kA and 12.5kA
 3 types of follow current (If) 50, 15 and 7kA
 Spark gap and varistor technology

SPD Class II
Good protection level

OVR type 2 and Type 2+3 are designed to protect electric installations and sensitive equipments against indirect surges with ensuring a low protection level (Up). It is characterized by its capacity to safely discharge current with 8/20 µs wave form.

Main benefits
 OVR T2 and T2+3 SPDs are available in specific multi-pole versions for all distribution systems
 For all versions the maximum protection level Up is 1.25 kV, a value suitable for the protection of all terminal equipment, even the most sensitive
 Safety reserve system on OVR T2s for an extended protection of the equipments

Main features
 Imax 20kA, 40kA and 80kA
 Up 1kV, 1.4kV and 1.5kV
 Uc (a.c/d.c) 75V, 150V, 275V, 350V, 440V, 600 V and 760V

SPD Class III
Low protection level voltage value

OVR type 3 shall be installed as close as possible from the sensitive equipement to protect. Tested with a 1,2/50 - 8/20 current combination wave generator, they ensure a very low protection level voltage value. 

Main benefits
 Extremely low level of protection voltage value that is suitable for all sensitive terminal equipments
 Good value of Imax 10kA
 Common and differential mode of protection

Main features
 Imax 10kA
 Up 900V
 Uc 275V and 440V