ABB OVR T1-T2 3N 100-2 Combined Surge Arrester 4-Pole for TT/TNS Networks with Remote Signaling (2CTB812111R2300)

In commercial and industrial electrical installations, protecting sensitive equipment from lightning-induced surges is critical. The ABB OVR T1-T2 3N 100-2 is a combined Type 1 and Type 2 surge arrester designed for 3-phase + Neutral (3N) systems in TT and TNS earthing configurations. With 4 poles and a total impulse current of 100 kA (10/350 µs), it provides robust protection at the service entrance or main distribution board.

Key specifications

• Product type: Combined surge arrester
• SPD type: Type 1 + Type 2
• Network configuration: 3-phase + Neutral (3N)
• Earthing system compatibility: TT, TNS
• Number of poles: 4
• Maximum continuous operating voltage (Uc): 255 V AC
• Nominal voltage (Un): 230 / 400 V AC
• Impulse current (Iimp) per pole (10/350 µs): 25 kA
• Total impulse current (Iimp) (10/350 µs): 100 kA
• Nominal discharge current (In) per pole (8/20 µs): 25 kA
• Maximum discharge current (Imax) per pole (8/20 µs): 100 kA
• Voltage protection level (Up) at In: < 1.5 kV
• Follow current extinguishing capability (Ifi): 100 kA
• Response time (tA): < 100 ns
• Technology: High-energy varistor
• Remote signaling: Yes (changeover contact)
• Status indication: Visual (green/red)
• Mounting type: DIN rail (35 mm)
• Module width: 4.5 DIN modules
• Degree of protection: IP20
• Operating temperature range: -40 to +80 °C
• Standards: IEC 61643-11, EN 61643-11
• Short-circuit withstand capability (Isccr): 50 kA

Why choose it

This arrester combines Type 1 and Type 2 protection in a single compact unit, reducing installation space and wiring effort. Its high-energy varistor technology ensures reliable clamping of transient overvoltages, while the integrated changeover contact enables remote monitoring of device status. The visual indicator provides immediate local status at a glance.

Ideal use cases

• Main distribution boards in commercial buildings
• Industrial facilities with TT or TNS earthing systems
• Protection of sensitive electronic equipment from direct lightning strikes
• Upgrading existing installations to meet enhanced surge protection requirements

Good to know

The device mounts on a standard 35 mm DIN rail and occupies 4.5 modules of width. It operates within a wide temperature range, making it suitable for various environments. For proper coordination, ensure the upstream overcurrent protection is rated appropriately.