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OVR T2-T3 3N 20-275 P QS

The ABB OVR T2-T3 3N 20-275 P QS is a Type 2 Surge Protective Device (SPD), also known as a secondary surge arrester or distribution-level SPD. It is designed for installation in low-voltage three-phase electrical distribution boards with a neutral conductor (3N). Its primary function is to protect sensitive electrical and electronic equipment connected to the system from the damaging effects of indirect lightning strikes and switching overvoltages that propagate through the power network. This SPD provides a high level of protection (Up / residual voltage) by safely diverting surge currents to ground.

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Technical Specifications / Parameters Parameter Specification Manufacturer Type Code OVR T2-T3 3N 20-275 P QS Brand / Series ABB OVR Series (Surge Protection Devices) Device Type Type 2 Surge Protective Device (SPD) Application Main distribution board or sub-distribution board protection (according to IEC 62305). Rated Voltage (Uc) 275 V AC (for 230/400V AC systems). This is the maximum continuous operating voltage. Network Configuration 3N (Three-phase + Neutral protection). It protects all phases (L1, L2, L3) relative to Neutral (N). Nominal Discharge Current (In) 20 kA (8/20 µs) per phase. This is the standard test current for Type 2 SPDs. Maximum Discharge Current (Imax) Significantly higher than In (e.g., 40 kA or 65 kA 8/20 µs). Voltage Protection Level (Up) Low (e.g., ≤ 1.5 kV). This is the residual voltage that appears across the terminals when discharging In, indicating its clamping performance. Protection Mode L-N, N-PE (Depending on design, it may protect between each Line and Neutral, and Neutral to Earth). Short-Circuit Withstand Rating High (e.g., 25 kA RMS according to IEC 61643-11). Thermal Protection Integrated thermal disconnector for safe failure mode. Status Indicator Green/Red window indicating operational health (Green = OK, Red = fault/end of life). Remote Signaling Contact (QS) Yes. The QS suffix indicates a built-in Changeover (SPDT) auxiliary contact for remote alarm signaling (e.g., to a BMS or PLC). Mounting DIN Rail Mounting (35mm). Standards & Approvals IEC/EN 61643-11, UL 1449 (4th Ed.) Type 2, CE.