Transient Surge Protector PSC2-230-TT 1P+N 12.5kA 2-Module Unpluggable

The Cirprotec PSC2-12,5/230 TT transient surge protector, reference 77738205, is a combined Type 1+2 device designed to protect single-phase electrical installations against transient overvoltages caused by lightning strikes and switching operations on the network. It features an internal 1+1 configuration for phase, neutral and earth, an impulse current Iimp of 12.5 kA between L-N, and a pluggable format of only 2 DIN rail modules.

It is specifically identified by Cirprotec for 230 V TT networks and combines the functions of a Type 1 and Type 2 surge protector in a single unit. It offers a nominal discharge current In of 20 kA between L-N, maximum discharge current Imax of 65 kA and a protection level Up ≤1.3 kV between phase and neutral, providing a high-performance solution for residential, commercial and industrial electrical panels.

Combined Type 1+2 surge protector

The Cirprotec PSC2-12,5/230 TT is classified as Class I+II according to IEC and Type 1+2 according to EN. This dual classification allows it to act both against impulse currents associated with lightning effects and against lower-energy transient overvoltages induced or generated by network switching.

By integrating both functions into a single device, coordination of surge protection within the electrical panel is simplified.

Impulse current Iimp of 12.5 kA

The 12.5 kA value included in the commercial designation corresponds to the impulse discharge current Iimp between L-N, tested with the 10/350 µs waveform characteristic of Type 1 surge protectors.

• Iimp L-N, 10/350 µs waveform: 12.5 kA.
• Iimp N-PE, 10/350 µs waveform: 25 kA.

Therefore, the 12.5 kA must not be confused with the protector's maximum discharge current Imax.

Imax of 65 kA and In up to 25 kA

As a Type 2 surge protector, the PSC2-12,5/230 TT offers high discharge capacities with the 8/20 µs waveform:

• Nominal discharge current In L-N: 20 kA.
• Nominal discharge current In N-PE: 25 kA.
• Maximum discharge current Imax L-N: 65 kA.
• Maximum discharge current Imax N-PE: 65 kA.

These performance values allow the device to withstand successive transient surges within the conditions established by IEC/EN 61643-11 standards.

1+1 configuration for single-phase installations

Although it may be commercially described as a 1P+N surge protector, Cirprotec technically defines its architecture as an internal 1+1 configuration with 2 poles.

The protection modes are:

• L-N: protection between phase and neutral.
• N-PE: protection between neutral and protective conductor.

This configuration is especially suitable for TT systems, as indicated by the PSC2-12,5/230 TT designation for this reference.

230 V rated voltage

The protector is designed for a rated voltage of 230 V AC at 50-60 Hz. The maximum continuous operating voltage Uc varies depending on the protection mode:

• Uc L-N: 275 V AC.
• Uc N-PE: 255 V AC.

These values determine the voltage the device can withstand continuously without starting its protective action.

Reduced protection level Up

Cirprotec specifies the following voltage protection levels at nominal discharge current:

• Up L-N: ≤1.3 kV.
• Up N-PE: ≤1.5 kV.

The Up level represents the residual voltage that appears during protector operation and is essential for coordinating the device with the withstand voltage of downstream equipment.

Short-circuit capacity Isccr of 25 kA

The PSC2-12,5/230 TT has a short-circuit capacity Isccr of 25 kA. Cirprotec also specifies a maximum upstream fuse of 200 A type gG.

Backup protection and its coordination must be selected according to the actual characteristics of the panel and the manufacturer's instructions.

Follow current Ifi of 100 A

The follow current Ifi specified by Cirprotec is 100 A. This parameter is related to the protector's ability to interrupt the mains current that may continue flowing after the protective element has operated.

Fast response to surges

The protector features very short response times:

• L-N response time: ≤25 ns.
• N-PE response time: ≤100 ns.

This rapid action helps limit very short-duration impulses before they spread to the electrical and electronic loads in the installation.

Dynamic thermal disconnection

The PSC2 incorporates dynamic thermal disconnection. When a protective element reaches end-of-life or an abnormal condition, the internal mechanism disconnects in open-circuit mode.

This system helps maintain device safety throughout its service life.

Pluggable format with replaceable cartridges

One of the advantages of the PSC2-12,5/230 TT is its pluggable design. The protection cartridges can be removed from the base and replaced when they reach the end of their service life without needing to dismantle or replace the entire device.

Cirprotec also uses mechanically polarized cartridges according to the mains voltage, helping prevent the installation of an incorrect reference during maintenance operations.

Visual status indicator

The device includes visual signalling to make cartridge status inspection easier:

• Green: protector operational.
• Not green: cartridge exhausted and replacement required.

Reference 77738205 corresponds to the standard version without remote indication contact. The equivalent variant equipped with remote signalling is reference 77738206.

Replacement cartridges

Cirprotec offers specific replaceable cartridges to simplify protector maintenance:

• Line cartridge for 230 V: PSC-12,5/230, reference 77738601.
• Neutral cartridge: PSC-25N, reference 77738613.

Individual replacement makes it possible to keep the base and existing wiring when only one of the protective elements has reached end of life.

Reversible chassis and Biconnect connection

The PSC 12.5 range includes a reversible chassis to provide flexibility in panel wiring. Cirprotec also uses its Biconnect connection system, designed to facilitate connection by cable and terminal or connection comb.

2 modules for DIN rail

The PSC2-12,5/230 TT occupies only 2 modules and is designed for DIN rail mounting. Its dimensions are approximately 36 mm wide, 90 mm high and 76 mm deep.

Its compact format makes it easy to incorporate Type 1+2 protection in panels where available space is limited.

Terminals for conductors up to 35 mm²

Cirprotec specifies the following connection capacities:

• Rigid conductor: 6 to 35 mm².
• Flexible conductor: 6 to 25 mm².
• Tightening torque: 3 Nm.

The final cross-section must be selected according to the characteristics of the installation and the mounting instructions.

IP20 protection

The device has an IP20 protection rating and is intended for installation inside electrical panels or enclosures that provide the required protection for the location.

Wide temperature range

The protector can operate between -40 and +85 °C and supports relative humidity from 5 to 95%, providing a wide environmental margin for professional electrical installations.

Its insulating material is PA66 CT1 and it has a UL94 V-0 flammability rating.

Applications of the Cirprotec PSC2-12,5/230 TT

• Single-phase electrical panels.
• Installations with TT system.
• Homes and residential buildings.
• Commercial and tertiary buildings.
• Industrial installations.
• Telecommunications.
• Electric vehicle charging infrastructure.
• Photovoltaic installations on the AC side when the configuration is compatible.
• Installations requiring coordinated Type 1+2 protection.
• Protection of electrical and electronic equipment against transient overvoltages.

Technical characteristics of Cirprotec 77738205

• Brand: Cirprotec.
• Reference: 77738205.
• Model: PSC2-12,5/230 TT.
• Family: PSC 12,5 1+1.
• Type: transient surge protector.
• IEC classification: Class I+II.
• EN classification: Type 1+2.
• Application: AC electrical network.
• Commercial configuration: single-phase 1P+N.
• Internal configuration: 1+1.
• Number of poles: 2.
• Network system: TT.
• Protection modes: L-N / N-PE.
• Rated voltage Un: 230 V AC.
• Frequency: 50-60 Hz.
• Uc L-N: 275 V AC.
• Uc N-PE: 255 V AC.
• Iimp L-N, 10/350 µs waveform: 12.5 kA.
• Iimp N-PE, 10/350 µs waveform: 25 kA.
• In L-N, 8/20 µs waveform: 20 kA.
• In N-PE, 8/20 µs waveform: 25 kA.
• Imax L-N, 8/20 µs waveform: 65 kA.
• Imax N-PE, 8/20 µs waveform: 65 kA.
• Up L-N: ≤1.3 kV.
• Up N-PE: ≤1.5 kV.
• Short-circuit capacity Isccr: 25 kA.
• Maximum upstream fuse: 200 A gG.
• Follow current Ifi: 100 A.
• L-N response time: ≤25 ns.
• N-PE response time: ≤100 ns.
• Dynamic thermal disconnection: yes.
• Disconnection mode: open circuit.
• Format: pluggable.
• Replaceable cartridges: yes.
• Visual indicator: green OK / not green replace.
• Remote indication: no.
• Version with remote indication: 77738206.
• Reversible chassis: yes.
• Biconnect connection: yes.
• Number of DIN modules: 2.
• Mounting: DIN rail.
• Approximate dimensions: 36 x 90 x 76 mm.
• Protection rating: IP20.
• Insulating material: PA66 CT1.
• Flammability: UL94 V-0.
• Rigid conductor: 6-35 mm².
• Flexible conductor: 6-25 mm².
• Tightening torque: 3 Nm.
• Operating temperature: -40 to +85 °C.
• Relative humidity: 5-95%.
• Line cartridge: PSC-12,5/230, reference 77738601.
• Neutral cartridge: PSC-25N, reference 77738613.
• Standards: IEC 61643-11 and EN 61643-11.

High-performance Type 1+2 protection in only 2 modules

The Cirprotec PSC2-12,5/230 TT combines Type 1 and Type 2 protection in a compact device for 230 V TT single-phase networks. Its Iimp of 12.5 kA between L-N, Imax of 65 kA, In of 20 kA and Up ≤1.3 kV provide a high level of protection against different types of transient overvoltages.

The pluggable design, replaceable cartridges, visual indication, reversible chassis and Biconnect connection simplify installation and subsequent maintenance operations, while its width of only 2 modules helps optimize the available space in the panel.

Important: the 12.5 kA indicated in the commercial name corresponds to the impulse current Iimp with 10/350 µs waveform between L-N, characteristic of Type 1 classification. The maximum discharge current Imax with 8/20 µs waveform is 65 kA. This reference does not include remote contact; for that function, reference 77738206 applies.