Single-phase transient surge protector 1P+N 15kA

The Cirprotec CS2-15/230 transient overvoltage surge protector, reference 77705211, is a Type 2 device designed to protect single-phase electrical installations against short-duration voltage spikes. It features an internal 1+1 configuration with 2 poles, is suitable for TT and TNS networks, and protects the L-N and N-PE modes, offering a compact solution for residential, commercial, and tertiary electrical panels.

The CS2-15/230 has a maximum discharge current Imax of 15 kA and a nominal discharge current In of 5 kA, both with an 8/20 µs waveform. It operates at a nominal voltage of 230 V AC, supports a maximum continuous operating voltage Uc of 275 V, and occupies only 2 DIN rail modules.

Type 2 transient overvoltage protection

The Cirprotec 77705211 is classified as a Type 2 surge protector according to EN 61643-11 and Class II according to IEC 61643-11. It is intended to limit transient overvoltages induced by switching operations in the electrical network or by indirect effects of lightning strikes.

Cirprotec recommends the CS 15 range as a second stage of protection in panels where a Type 1 protector is already installed, or as a first stage in shops, homes, and other installations not directly exposed to lightning strikes and without an external lightning protection system.

1+1 configuration for single-phase networks

Although it may be commercially described as a 1P+N single-phase protector, Cirprotec technically identifies this reference with an internal 1+1, 2-pole configuration.

The protection modes are:

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

This architecture is especially designed for single-phase installations in compatible TT and TNS systems.

Imax of 15 kA and In of 5 kA

The CS2-15/230 provides a maximum discharge current Imax of 15 kA and a nominal discharge current In of 5 kA, both tested with an 8/20 µs waveform.

• Imax: 15 kA.
• In: 5 kA.
• Waveform: 8/20 µs.

These values define the protector’s ability to conduct transient impulses under the conditions established by the applicable standards.

Protection level Up

Cirprotec specifies different protection levels depending on the connection mode:

• Up between L-N: ≤1.2 kV.
• Up between N-PE: ≤1.5 kV.

The Up level indicates the residual voltage present at the protector terminals during operation under standardized test conditions.

Maximum continuous operating voltage of 275 V

The protector is designed for a nominal voltage of 230 V AC at 50-60 Hz and supports a maximum continuous operating voltage Uc of 275 V both between L-N and N-PE.

Correct Uc selection allows the device to remain operational during normal mains variations without compromising its function against transient overvoltages.

Short-circuit capacity of 10 kA

The CS2-15/230 has a short-circuit capacity Isccr of 10 kA according to Cirprotec’s specified conditions.

The manufacturer also indicates a maximum upstream fuse of 63 A type gG. Coordination with overcurrent protection devices must be carried out according to the actual characteristics of the installation.

Fast response to impulses

The specified response times are:

• L-N: ≤25 ns.
• N-PE: ≤100 ns.

This rapid action helps limit very short-duration overvoltages before they spread to downstream connected equipment.

LED status indicator

Reference 77705211 includes visual LED signaling to make it easier to check the protector’s status during inspection and maintenance tasks.

This version should not be confused with reference 77705212, which corresponds to the equivalent model with remote indication.

Monobloc 2-module DIN format

The Cirprotec CS2-15/230 uses a monobloc construction and occupies 2 DIN rail modules. Its dimensions are approximately 36 mm wide, 90 mm high, and 58 mm deep.

This compact format makes it easy to integrate into electrical panels where available space is limited.

Terminals for conductors up to 35 mm²

The terminals accept the following conductor sizes:

• Rigid conductor: 6 to 35 mm².
• Flexible conductor: 6 to 25 mm².
• Tightening torque: 4 Nm.

The final conductor size must be determined according to the installation design and applicable regulatory requirements.

IP20 protection and self-extinguishing housing

The device has an IP20 protection rating and is intended for installation inside suitable panels or enclosures.

The insulating housing is made of glass-fiber reinforced polycarbonate, PC+GF, in RAL 7035 gray, with UL94 V-0 flammability classification.

Wide temperature range

Cirprotec specifies an operating temperature range from -40 to +85 °C and an admissible relative humidity of 5 to 95%.

Applications of the Cirprotec CS2-15/230

• Single-phase electrical panels.
• Homes and residential buildings.
• Commercial premises.
• Offices.
• Tertiary sector installations.
• Compatible industrial installations.
• Protection of electrical and electronic equipment.
• TT and TNS networks.
• Second stage of protection behind a Type 1 protector.
• First stage in installations not directly exposed to lightning when the configuration allows it.

Technical features of the Cirprotec 77705211

• Brand: Cirprotec.
• Reference: 77705211.
• Model: CS2-15/230.
• Series: CS 15.
• Type: transient overvoltage surge protector.
• EN classification: Type 2.
• IEC classification: Class II.
• Internal configuration: 1+1.
• Number of poles: 2.
• Application: single-phase network.
• Network configurations: TT and TNS.
• Protection modes: L-N / N-PE.
• Nominal voltage Un: 230 V AC.
• Frequency: 50-60 Hz.
• Uc L-N: 275 V AC.
• Uc N-PE: 275 V AC.
• Nominal discharge current In: 5 kA, 8/20 µs waveform.
• Maximum discharge current Imax: 15 kA, 8/20 µs waveform.
• Up L-N: ≤1.2 kV.
• Up N-PE: ≤1.5 kV.
• Short-circuit capacity Isccr: 10 kA.
• Maximum upstream fuse: 63 A gG.
• L-N response time: ≤25 ns.
• N-PE response time: ≤100 ns.
• Status indication: LED.
• Remote indication: not on this reference.
• Format: monobloc.
• Number of modules: 2.
• Mounting: DIN rail.
• Width: approximately 36 mm.
• Height: approximately 90 mm.
• Depth: approximately 58 mm.
• Net weight: 0.118 kg.
• Protection rating: IP20.
• Insulating material: PC+GF.
• Color: gray RAL 7035.
• Flammability: UL94 V-0.
• Rigid conductor: 6-35 mm².
• Flexible conductor: 6-25 mm².
• Tightening torque: 4 Nm.
• Operating temperature: -40 to +85 °C.
• Relative humidity: 5-95%.
• Standards: IEC 61643-11 and EN 61643-11.

Compact Type 2 protection for single-phase networks

The Cirprotec CS2-15/230 combines a 1+1 configuration, Imax of 15 kA, In of 5 kA, and protection levels of up to ≤1.2 kV between phase and neutral in a monobloc format of only 2 DIN modules. It is especially suitable for protecting electrical panels against transient overvoltages in TT and TNS networks.

Its LED indicator, Isccr capacity of 10 kA, wide temperature range, and terminals for conductors up to 35 mm² make it easy to integrate into residential, commercial, and professional installations.

Important: this device protects exclusively against transient overvoltages. It does not provide protection against permanent overvoltages and does not replace the magnetothermal or residual current protection devices required in the installation.