Why Choose the ABB OVR T1-T2 1L 25-255 P Surge Protective Device?
The ABB OVR T1-T2 1L 25-255 P is a combined Type 1 + Type 2 surge protective device (SPD) designed to protect low-voltage electrical installations against high-energy lightning currents and transient overvoltages. Identified by ABB order code 2CTB813250R2300, this single-pole device is suitable for TT, TN-S and TN-C distribution systems and is typically installed in main AC distribution boards or sub-distribution boards.
Using spark-gap technology, the OVR T1-T2 1L 25-255 P combines substantial lightning-current handling with a low residual protection voltage. It provides a 25 kA impulse current (Iimp) using the 10/350 µs waveform, together with a 25 kA nominal discharge current (In) and 60 kA maximum discharge current (Imax) using the 8/20 µs waveform.
The device operates on 230/400 V AC networks with a 264 V AC maximum continuous operating voltage (Uc) and provides a voltage protection level of ≤1.5 kV. Its pluggable construction enables the protection cartridge to be replaced independently of the DIN rail base, simplifying maintenance of lightning and surge protection systems.
Key Advantages
- Combined Type 1 + Type 2 protection in a single compact SPD.
- 25 kA impulse current (Iimp) using the 10/350 µs lightning-current waveform.
- 60 kA maximum discharge current (Imax) using an 8/20 µs waveform.
- 25 kA nominal discharge current (In) for dependable Type 2 surge protection.
- Low ≤1.5 kV voltage protection level (Up) helps limit transient stress on downstream equipment.
- Suitable for TT, TN-S and TN-C distribution networks.
- 50 kA follow-current interruption capability supports demanding AC installations.
- Pluggable cartridge construction simplifies servicing and replacement.
Key Features
- ABB OVR T1-T2 surge protection range.
- Type 1 + Type 2 / Class I + Class II surge protection.
- Single protected line.
- Spark-gap technology.
- 230/400 V AC nominal network voltage.
- 264 V AC maximum continuous operating voltage (Uc).
- 25 kA impulse current (Iimp, 10/350 µs).
- 25 kA nominal discharge current (In, 8/20 µs).
- 60 kA maximum discharge current (Imax, 8/20 µs).
- ≤1.5 kV voltage protection level (Up).
- <100 ns response time.
- Green/red end-of-life indication for straightforward condition checking.
- Pluggable protection cartridge for convenient maintenance.
Reliable Type 1 and Type 2 Protection for AC Distribution Systems
Combined Type 1 and Type 2 SPDs are designed to handle both high-energy lightning-current impulses and transient overvoltages within low-voltage power systems. The ABB OVR T1-T2 1L 25-255 P withstands a 25 kA 10/350 µs impulse current while also providing Type 2 performance against 8/20 µs surge currents, helping coordinate lightning and surge protection within a single device.
Its spark-gap technology provides high lightning-current capability together with a ≤1.5 kV protection level. The pluggable architecture allows the protection cartridge to be replaced independently of the base, while the green/red indicator provides a clear visual indication of whether the installed protection module remains operational.
Typical Applications
- Main AC electrical distribution switchboards.
- Sub-distribution boards.
- 230/400 V AC low-voltage installations.
- TT, TN-S and TN-C distribution systems.
- Commercial and industrial electrical installations.
- Building power distribution systems.
- Installations requiring combined Type 1 and Type 2 lightning and surge protection.
