Why Choose the ABB OVR T1-T2 1N 50-255 P TS Surge Protective Device?
The ABB OVR T1-T2 1N 50-255 P TS is a combined Type 1 + Type 2 surge protective device (SPD) designed to protect single-phase plus neutral low-voltage electrical installations against lightning currents and transient overvoltages. Identified by ABB order code 2CTB812511R2300, it provides 1P+N protection for 230 V AC TT and TN-S networks.
The device uses a 1+1 protection configuration, combining a 25 kA L-N protection path with a high-capacity 50 kA N-PE protection path. Its spark-gap technology is designed for installation where substantial lightning-current capability is required, while the low voltage protection level helps reduce electrical stress on downstream equipment.
The OVR T1-T2 1N 50-255 P TS provides an impulse discharge current (Iimp) of 25 kA L-N and 50 kA N-PE using a 10/350 µs waveform, with a 50 kA total lightning-current capability. Its pluggable construction, visual status indication and integrated TS remote signalling contact provide convenient maintenance and condition monitoring for demanding building, commercial and industrial installations.
Key Advantages
- Combined Type 1 + Type 2 protection against lightning currents and transient overvoltages.
- Designed for 230 V AC single-phase plus neutral TT and TN-S systems.
- 25 kA L-N impulse discharge current (Iimp) using a 10/350 µs waveform.
- 50 kA N-PE impulse discharge current and 50 kA total lightning-current capability.
- 25 kA nominal discharge current (In) for Type 2 surge protection.
- 1.5 kV voltage protection level across the L-N and N-PE protection paths.
- Pluggable protection cartridges simplify maintenance and replacement.
- TS remote signalling enables external monitoring of SPD condition.
Key Features
- ABB OVR T1-T2 surge protection range.
- Type 1 / Class I + Type 2 / Class II SPD.
- 1P+N / 1+1 protection configuration.
- 230 V AC nominal voltage, 50/60 Hz.
- 264 V AC L-N maximum continuous operating voltage (Uc).
- 255 V AC N-PE maximum continuous operating voltage.
- 25 kA L-N impulse discharge current (Iimp, 10/350 µs).
- 50 kA N-PE impulse discharge current (Iimp, 10/350 µs).
- 50 kA total discharge current (Itotal, 10/350 µs).
- 25 kA nominal discharge current (In, 8/20 µs).
- 1.5 kV L-N and N-PE voltage protection level (Up).
- Spark-gap surge protection technology.
- Visual status indication plus 1NO + 1NC remote signalling contact.
- Pluggable modular construction for DIN rail mounting.
Reliable Type 1 and Type 2 Protection for Single-Phase Systems
Combined Type 1 and Type 2 surge protective devices provide coordinated protection against both high-energy lightning currents and transient overvoltages. Type 1 capability is evaluated using the 10/350 µs lightning-current waveform, while Type 2 performance addresses 8/20 µs surge currents that can arise from indirect lightning effects and electrical switching operations.
The ABB OVR T1-T2 1N 50-255 P TS combines a 25 kA L-N lightning impulse rating with a 50 kA N-PE discharge path in a compact 1P+N assembly. Replaceable protection cartridges simplify servicing, while local status indication and the TS changeover contact allow protection condition to be checked locally or incorporated into a remote monitoring system.
Typical Applications
- 230 V AC single-phase electrical installations.
- TT and TN-S low-voltage distribution systems.
- Main low-voltage distribution boards.
- Commercial and industrial electrical panels.
- Building electrical distribution systems.
- Installations requiring combined Type 1 and Type 2 lightning and surge protection.
- Systems requiring remote monitoring of surge protective device status.
