Why Choose the ABB OVR T1-T2 3N 12.5-440s P QS Surge Protective Device?
The ABB OVR T1-T2 3N 12.5-440s P QS is a high-performance combined Type 1 + Type 2 surge protective device (SPD) designed to protect three-phase low-voltage electrical installations against lightning currents and transient overvoltages. Identified by ABB order code 2CTB815710R4800, this four-pole 3+1 device forms part of the ABB OVR QuickSafe range and is compatible with System pro M compact distribution equipment.
Designed for TT and TN-S distribution systems, the device provides an impulse current rating of 12.5 kA per protected line using a 10/350 µs waveform, an 80 kA maximum discharge current and a 30 kA nominal discharge current. Its 440 V AC maximum continuous operating voltage and 400/690 V AC nominal system rating make it suitable for demanding three-phase industrial and commercial power networks.
The OVR T1-T2 3N 12.5-440s P QS incorporates ABB's QuickSafe reserve-varistor technology, which maintains a basic level of surge protection if the primary protection element reaches the end of its service life. Its pluggable construction simplifies cartridge replacement, while mechanical operating indicators provide clear local status information for routine inspection and preventive maintenance.
Key Advantages
- Combined Type 1 + Type 2 lightning and surge protection in one device.
- 3+1 configuration designed for three-phase TT and TN-S systems.
- 12.5 kA impulse current (Iimp, 10/350 µs) for Type 1 lightning-current protection.
- 80 kA maximum discharge current (Imax) for high-energy transient events.
- 30 kA nominal discharge current (In) for dependable Type 2 surge protection.
- 1.8 kV voltage protection level (Up) helps limit transient voltage reaching downstream equipment.
- 440 V AC maximum continuous operating voltage for higher-voltage applications.
- ABB QuickSafe reserve-varistor technology helps maintain basic protection at end of life.
- Pluggable protection modules simplify servicing and replacement.
- Mechanical status indication enables straightforward local condition checking.
Key Features
- ABB OVR QuickSafe series.
- Type 1 + Type 2 / Class I + II surge protection.
- Four poles in a 3+1 configuration.
- Designed for TT and TN-S low-voltage distribution systems.
- 12.5 kA impulse current (Iimp, 10/350 µs).
- 30 kA nominal discharge current (In, 8/20 µs).
- 80 kA maximum discharge current (Imax, 8/20 µs).
- 400/690 V AC nominal system voltage.
- 440 V AC maximum continuous operating voltage (Uc).
- 1.8 kV voltage protection level (Up).
- Reserve-varistor Safety Reserve functionality.
- Mechanical operating-status indication.
- Pluggable protection cartridges.
- 35 mm DIN-rail mounting.
- IP20 degree of protection.
Combined Lightning and Surge Protection for TT and TN-S Systems
Combined Type 1 + Type 2 SPDs provide coordinated protection against both lightning-current impulses and transient surge voltages. The ABB OVR T1-T2 3N 12.5-440s P QS is designed to withstand Type 1 lightning-current impulses characterised by a 10/350 µs waveform while also providing Type 2 protection against transient currents characterised by an 8/20 µs waveform.
Its 3+1 architecture is designed for TT and TN-S installations and combines phase protection with dedicated neutral protection. ABB's reserve-varistor design helps retain basic protection after the primary protection stage reaches the end of its service life, while the pluggable construction and mechanical indicators simplify inspection, servicing and cartridge replacement.
Typical Applications
- Main electrical distribution switchboards.
- Three-phase TT electrical distribution systems.
- Three-phase TN-S electrical distribution systems.
- 400/690 V AC industrial power networks.
- Buildings equipped with external lightning protection systems.
- Industrial manufacturing and process-control facilities.
- Industrial automation and machinery installations.
- Commercial buildings and infrastructure systems.
- Protection of sensitive electrical and electronic equipment.
