GBC-25/255/4 Three-Phase AC Power Surge Protective Device, 25 kA Iimp, 255 V~ Uc

Description

The GBC-25/255/4 is a three-phase AC power surge protective device for Class II lightning overvoltage protection of three-phase AC power supplies. It is rated for a nominal working voltage Un of 220 V~ and a maximum continuous AC operating voltage Uc of 255 V~ at L/N-PE, with a 25 kA impulse current Iimp and a 2.0 kV voltage protection level Up (10/350 µs) at L/N-PE.

Product Overview

The GBC-25/255/4 is an AC power surge protective device intended for three-phase AC power supply systems. It is classified as an SPD with a Class II rating and is designed to limit transient overvoltages at the L/N-PE path. The device responds within 100 ns and is housed in a body measuring 90 mm × 65 mm × 144 mm with an IP20 enclosure protection rating.

Key Features

• Three-phase AC power surge protective device for Class II lightning overvoltage protection
• Nominal working voltage Un: 220 V~
• Maximum continuous AC operating voltage Uc at L/N-PE: 255 V~
• Impulse current Iimp: 25 kA
• Voltage protection level Up (10/350 µs) at L/N-PE: 2.0 kV
• Response time tA at L/N-PE: 100 ns
• 35 mm DIN rail mounting
• Conductor connection capacity up to 50 mm²
• IP20 enclosure protection rating

Technical Specifications

Parameter	Value
Model	GBC-25/255/4
SPD class	II
Nominal working voltage Un	220 V~
Maximum continuous AC operating voltage Uc, L/N-PE	255 V~
Impulse current Iimp	25 kA
Voltage protection level Up (10/350 µs), L/N-PE	2.0 kV
Response time tA, L/N-PE	100 ns
Mounting method	35 mm DIN rail
Conductor connection capacity	≤50 mm²
Maximum torque	3.2 Nm~3.7 Nm
Enclosure protection rating	IP20
Temperature and humidity range	-40 ℃ to +80 ℃, relative humidity ≤95%
Main body dimensions	90 mm × 65 mm × 144 mm

Applications

The GBC-25/255/4 is intended for lightning overvoltage protection of three-phase AC power supplies. It is suitable for installation in three-phase AC power distribution systems where Class II surge protection is required at the L/N-PE path.

Installation and Use

• The device can be connected in a conventional direct parallel configuration. For better protection performance, wiring should be kept as short as possible, with the total length controlled within 0.5 m.
• Connecting conductors should be 25–50 mm² multi-core copper conductors.
• A suitable air circuit breaker or fuse should be connected in series at the front end of the device. The air circuit breaker should use a C trip characteristic.
• The power supply must be disconnected during installation. Live operation is strictly prohibited, and connecting conductors must meet the requirements.
• The device requires no special maintenance; only periodic checks of whether the module is loose or abnormal are needed.

Frequently Asked Questions

What is the maximum continuous AC operating voltage of the GBC-25/255/4?

The maximum continuous AC operating voltage Uc at L/N-PE is 255 V~.

What is the voltage protection level of the GBC-25/255/4?

The voltage protection level Up (10/350 µs) at L/N-PE is 2.0 kV.

What conductor size is recommended for the GBC-25/255/4?

Connecting conductors should be 25–50 mm² multi-core copper conductors, and the conductor connection capacity is ≤50 mm².

How is the GBC-25/255/4 mounted?

The device is mounted on a 35 mm DIN rail.