Why Choose the ABB OVR T2 40-275s P QS Surge Protective Device?
The ABB OVR T2 40-275s P QS, order code 2CTB815704R1200, is a compact Type 2 surge protective device (SPD) designed to protect low-voltage electrical installations and sensitive equipment against transient overvoltages caused by indirect lightning effects and switching events. It is suitable for coordinated surge protection in residential, commercial and industrial distribution systems.
Designed for 230 V AC networks with a maximum continuous operating voltage of 275 V AC, the OVR T2 40-275s P QS provides a nominal discharge current In of 20 kA and a maximum discharge current Imax of 40 kA using the 8/20 µs waveform. Its voltage protection level Up of 1.4 kV helps limit transient voltage reaching downstream electrical and electronic equipment.
This single-pole SPD combines ABB QuickSafe technology with a Safety Reserve preventive-maintenance function. Rather than leaving the installation completely unprotected when the primary varistor reaches end of life, the reserve protection stage continues to provide basic surge protection until the cartridge can be replaced. Its pluggable construction and visual status indication further simplify inspection and maintenance.
Key Advantages
- Reliable Type 2 / Class II surge protection for low-voltage installations.
- 40 kA maximum discharge current using the 8/20 µs waveform.
- 20 kA nominal discharge current for effective transient surge suppression.
- 1.4 kV voltage protection level helps protect sensitive downstream equipment.
- Safety Reserve function maintains basic protection after the primary protection stage reaches end of life.
- ABB QuickSafe technology supports dependable thermal disconnection.
- Pluggable cartridge construction simplifies maintenance and replacement.
- Visual status indication enables straightforward inspection.
- 100 kA short-circuit withstand capability supports demanding installations.
- Compact 17.8 mm single-module width conserves DIN-rail space.
Key Features
- ABB OVR T2 QuickSafe series.
- Type 2 / Class II surge protective device.
- Single-pole, single protected-line configuration.
- Suitable for use in TT, TN-C and TN-S systems as part of the appropriate SPD arrangement.
- 230 V AC nominal voltage.
- 275 V AC maximum continuous operating voltage Uc.
- 20 kA nominal discharge current In.
- 40 kA maximum discharge current Imax.
- 2 kA impulse-current capability using a 10/350 µs waveform.
- 1.4 kV voltage protection level Up.
- Safety Reserve preventive-maintenance feature.
- Pluggable protection cartridge.
- Optical/mechanical status indication.
- IP20 degree of protection.
Type 2 Surge Protection with Safety Reserve Technology
Type 2 SPDs are designed to safely discharge transient currents characterised by the 8/20 µs waveform before damaging overvoltages can reach sensitive equipment. The ABB OVR T2 40-275s P QS combines a 20 kA nominal discharge current, 40 kA maximum discharge current and 1.4 kV protection level in a compact single-module format suitable for coordinated surge protection.
The distinguishing Safety Reserve feature provides an additional level of protection availability. When the main varistor reaches the end of its service life, a reserve varistor continues to provide basic surge protection until maintenance can be performed. Combined with visual status indication and a replaceable cartridge, this allows maintenance personnel to identify deterioration and schedule replacement without unnecessarily changing the complete SPD assembly.
Typical Applications
- Main low-voltage distribution boards.
- Sub-distribution boards and local electrical panels.
- Residential electrical installations.
- Commercial buildings and offices.
- Industrial electrical and control panels.
- Protection of sensitive electronic and automation equipment.
- TT, TN-C and TN-S low-voltage distribution systems.
- Installations requiring preventive SPD maintenance indication.
- Coordinated surge protection systems using pluggable ABB OVR devices.
