Surge Protector OVR T2-T3 1N 20-275 P QS

The ABB OVR T2-T3 1N 20-275 P QS surge protector, reference 2CTB803972R1200, is a Type 2+3 transient overvoltage protection device designed to protect electrical installations and sensitive equipment against surges caused by switching operations on the network or indirect lightning effects. It features a 1P+N configuration, maximum continuous operating voltage of 275 V AC, maximum discharge current of 20 kA, and a protection level Up of up to 1.4 kV.

It is part of ABB's OVR surge protector range and uses QuickSafe technology. Its plug-in design makes maintenance and cartridge replacement easy, while the visual status indicator allows quick checking of the protector's condition. It is designed for DIN rail mounting and occupies only 2 modules.

Combined Type 2+3 surge protector

The ABB 2CTB803972R1200 combines the features of Type 2 and Type 3 surge protection devices. This design makes it suitable for limiting transient overvoltages and providing a reduced residual voltage level for the protection of sensitive electrical and electronic equipment.

ABB recommends installing Type 2+3 protectors as close as possible to the sensitive loads to be protected, correctly coordinating them with the surge protection devices installed upstream.

• Protector class: Type 2 + Type 3.
• Reference: 2CTB803972R1200.
• Model: OVR T2-T3 1N 20-275 P QS.
• Technology: ABB QuickSafe.
• Version: plug-in.

1P+N configuration for TT and TN-S networks

The protector has a 1P+N configuration, with two protected poles, and is intended for low-voltage installations with TT and TN-S distribution systems.

This configuration makes it especially suitable for single-phase circuits where it is necessary to limit surges between phase, neutral and earth.

• Configuration: 1P+N.
• Number of poles: 2.
• Protected poles: 2.
• Number of conductors: 2.
• Neutral position: right.
• Distribution systems: TT and TN-S.

Maximum discharge current of 20 kA

ABB specifies for this protector a maximum discharge current Imax of 20 kA with an 8/20 µs waveform. This capacity allows the device to divert high-intensity transient currents to earth and limit the voltage reaching downstream connected equipment.

The nominal discharge current In is 5 kA with an 8/20 µs waveform, according to the technical documentation for the range.

• Maximum discharge current Imax: 20 kA, 8/20 µs waveform.
• Nominal discharge current In: 5 kA, 8/20 µs waveform.
• Short-circuit withstand current Icc: up to 100 kA depending on configuration and associated protection.

Maximum operating voltage of 275 V

Reference 2CTB803972R1200 has a maximum continuous operating voltage Uc of 275 V AC. It is designed for low-voltage networks with a system nominal voltage of 230/400 V AC.

• Maximum continuous operating voltage Uc: 275 V AC.
• System nominal voltage: 230/400 V AC.
• Nominal voltage Ur: 400 V AC.

Protection level Up of 1.4 kV

The surge protection level Up is 1.4 kV. This parameter indicates the maximum residual voltage level that may appear under certain test conditions during protector operation.

ABB also specifies a protection level of 0.9 kV between phase and neutral, helping to improve the protection of sensitive equipment connected to the installation.

• Protection level Up: 1.4 kV.
• L-N protection level: 0.9 kV.
• N-PE protection level: 1.4 kV.

ABB QuickSafe technology

The OVR T2-T3 incorporates ABB QuickSafe technology, developed for the surge protection devices in the OVR range. This solution is designed to provide safe disconnection of the protective element when it reaches the end of its service life.

The device also features a visual status indicator, which allows you to visually check whether the protector is still operational and simplifies inspection and maintenance tasks in the electrical panel.

Plug-in design for easier maintenance

The P version of the ABB OVR T2-T3 corresponds to a plug-in design. The protective module can be replaced without having to completely replace the installed base, simplifying maintenance work.

This format is especially practical in installations where it is desirable to reduce intervention times after a protector has reached the end of its service life.

Without remote signaling contact

Reference 2CTB803972R1200 does not include a remote signaling contact. ABB identifies variants equipped with remote signaling by the letters TS in the product designation.

This model therefore provides local checking via its visual status indicator. For applications requiring remote monitoring, the corresponding ABB variant equipped with a TS contact must be selected.

DIN rail mounting in 2 modules

The protector is designed to be installed directly on a DIN rail in modular electrical panels. Its net width is 35.6 mm, equivalent to approximately 2 DIN modules.

• Mounting: DIN rail.
• Width: 35.6 mm.
• Height: 88 mm.
• Depth: 58 mm.
• Module width: 2 modules.
• Weight: approximately 0.24 kg.

IP20 protection

The ABB OVR T2-T3 1N 20-275 P QS has an IP20 protection rating and is designed to be installed inside a suitable electrical enclosure or panel.

According to the technical documentation, it can operate up to an altitude of 5,000 meters without derating.

• Protection rating: IP20.
• Maximum altitude without derating: 5,000 m.
• Status indicator: yes.

Backup overcurrent protection

ABB specifies that OVR surge protectors must have appropriate overcurrent protection by means of a circuit breaker or fuse, always taking into account coordination with the main upstream protection.

For Type 2+3 protectors of 20 kA and Uc 275 V, the ABB catalog specifies a curve C circuit breaker of up to 63 A maximum as a reference and recommends, for the standard configuration, an ABB S200 C10 MCB. The final selection must be made according to the specific conditions of the installation and the manufacturer's coordination tables.

Use in residential, commercial and industrial installations

The ABB 2CTB803972R1200 can be used in residential installations, commercial buildings and industrial applications where sensitive equipment needs protection against transient overvoltages.

Loads that can benefit from coordinated surge protection include electronic equipment, automation systems, household appliances, electronic lighting, IT systems, HVAC equipment and other sensitive receivers.

IEC/EN 61643-11 standard

The ABB OVR T2-T3 1N 20-275 P QS is developed in accordance with IEC 61643-11 and EN 61643-11 standards applicable to surge protection devices connected to low-voltage electrical networks.

ABB 2CTB803972R1200 technical characteristics

• Brand: ABB.
• Range: OVR.
• Reference: 2CTB803972R1200.
• Model: OVR T2-T3 1N 20-275 P QS.
• Type: transient overvoltage protector.
• Class: Type 2 + Type 3.
• Technology: QuickSafe.
• Configuration: 1P+N.
• Number of poles: 2.
• Protected poles: 2.
• Network systems: TT and TN-S.
• System nominal voltage: 230/400 V AC.
• Maximum operating voltage Uc: 275 V AC.
• Nominal discharge current In: 5 kA, 8/20 µs waveform.
• Maximum discharge current Imax: 20 kA, 8/20 µs waveform.
• Protection level Up: 1.4 kV.
• L-N protection level: 0.9 kV.
• Status indicator: yes.
• Remote signaling contact: no.
• Version: plug-in.
• Mounting: DIN rail.
• Module width: 2 modules.
• Dimensions: 88 x 35.6 x 58 mm.
• Weight: approximately 0.24 kg.
• Protection rating: IP20.
• Maximum altitude without derating: 5,000 m.
• Standards: IEC 61643-11 and EN 61643-11.
• EAN: 3660308519689.

The ABB OVR T2-T3 1N 20-275 P QS 2CTB803972R1200 surge protector offers a compact solution for protecting sensitive electrical and electronic equipment against transient overvoltages. Its Type 2+3 combination, 1P+N configuration for TT and TN-S networks, Uc of 275 V, Imax of 20 kA, Up of 1.4 kV, QuickSafe technology and plug-in cartridge make it easy to integrate into residential, commercial and industrial electrical panels.