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 intended for Class I lightning overvoltage protection of three-phase AC power supplies. It is designed for L/N-PE protection with a nominal working voltage Un of 220 V~ and a maximum continuous AC operating voltage Uc of 255 V~.

Product Overview

The GBC-25-255-4 surge protective device is used on three-phase AC power supplies for Class I lightning overvoltage protection. It is a Class II SPD according to its technical specification, with a rated impulse current Iimp of 25 kA and a voltage protection level Up of 2.0 kV at L/N-PE measured under the 10/350 µs waveform. The device is housed for a 35 mm DIN rail installation and has an enclosure protection rating of IP20.

Key Features

• Three-phase AC power surge protective device for Class I lightning overvoltage protection
• Nominal working voltage Un: 220 V~
• Maximum continuous AC operating voltage Uc at L/N-PE: 255 V~
• Rated impulse current Iimp: 25 kA
• Voltage protection level Up at L/N-PE (10/350 µs): 2.0 kV
• Response time tA at L/N-PE: 100 ns
• 35 mm DIN rail mounting
• Conductor connection capacity up to 50 mm²
• Maximum tightening torque: 3.2 Nm to 3.7 Nm
• Enclosure protection rating: IP20
• Operating temperature range: -40 °C to +80 °C, relative humidity ≤ 95%

Technical Specifications

Parameter	Value
Model	GBC-25-255-4
SPD class	II
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 at L/N-PE (10/350 µs)	2.0 kV
Response time tA at L/N-PE	100 ns
Mounting method	35 mm DIN rail
Conductor connection capacity	≤ 50 mm²
Maximum tightening torque	3.2 Nm to 3.7 Nm
Enclosure protection rating	IP20
Temperature and humidity range	-40 °C to +80 °C, 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 AC power distribution systems where a Class I surge protective device with a 25 kA impulse current rating and a 255 V~ maximum continuous operating voltage is required.

Installation and Use

The GBC-25-255-4 can be connected in a conventional direct parallel configuration. For improved protection performance, the connecting conductors should be kept as short as possible, with a total length controlled within 0.5 m.

Connecting conductors should be 25 mm² to 50 mm² multi-core copper conductors. A suitable circuit breaker or fuse should be connected in series ahead of the surge protective device; the circuit breaker should have a C trip characteristic.

The power supply must be disconnected before installation. Live operation is strictly prohibited, and the connecting conductors must meet the specified requirements.

The surge protective device requires no special maintenance. Periodic checks should be made to confirm that the module is not loose and is operating normally.

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 rated impulse current of the GBC-25-255-4?

The rated impulse current Iimp is 25 kA.

What conductor size does the GBC-25-255-4 accept?

The conductor connection capacity is up to 50 mm², and 25 mm² to 50 mm² multi-core copper conductors should be used for the connecting conductors.

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

The device is mounted on a 35 mm DIN rail.