GBV-120-385-3+1-27 AC Power Surge Protective Device, Class II, 120 kA Imax

Description

The GBV-120-385-3+1-27 is a Class II AC power surge protective device intended for lightning overvoltage protection of single-phase AC power supplies. It limits transient overvoltages at the L-N and N-PE paths and provides a status indicator together with a remote signalling contact for monitoring.

Product Overview

The device is designed for single-phase AC supply protection at Class II. Its nominal operating voltage Un is 220V~, with a maximum continuous operating voltage Uc of 385V~ across L-N and 255V~ across N-PE. Surge current capability is specified as In 60kA and Imax 120kA, with voltage protection levels of 3.0kV (L-N) and 2.0kV (N-PE) measured at In with an 8/20µs waveform.

Key Features

• Class II surge protection for single-phase AC power supplies
• L-N and N-PE protection paths with separate voltage protection levels
• Nominal discharge current In 60kA and maximum discharge current Imax 120kA
• Fast response: tA 25ns (L-N) and 100ns (N-PE)
• Status indicator window: white for normal operation, red for failure
• NC-COM changeover remote signalling contact
• 35 mm DIN rail mounting
• PBT enclosure with UL94-V0 flammability rating and IP20 protection

Technical Specifications

Parameter	Value
SPD classification	II
Nominal operating voltage Un	220V~
L-N maximum continuous operating voltage Uc	385V~
N-PE maximum continuous operating voltage Uc	255V~
Nominal discharge current In	60kA
Maximum discharge current Imax	120kA
L-N voltage protection level Up (In@8/20µs)	3.0kV
N-PE voltage protection level Up (In@8/20µs)	2.0kV
L-N response time tA	25ns
N-PE response time tA	100ns
L-N, N-PE status indication	White: normal / Red: failed
Mounting method	35mm DIN rail
Conductor connection capacity	≤35mm²
Maximum torque	3.5Nm~4.5Nm
Enclosure material	PBT
Enclosure flammability rating	UL94-V0
Enclosure protection rating	IP20
Remote signalling contact type	Changeover contact, NC-COM normally closed
Remote signalling contact AC rating	250V/0.5A
Remote signalling contact DC rating	125V/0.2A
Remote signalling contact terminal capacity	≤1.5mm²
Temperature and humidity range	-40℃ to +80℃, relative humidity ≤95%
Altitude	≤3000m
Main body dimensions	90mm×65mm×54mm

Applications

The GBV-120-385-3+1-27 is used for Class II lightning overvoltage protection of single-phase AC power supplies. It is suitable for installation in AC power distribution equipment where L-N and N-PE surge protection is required.

Installation and Use

The device can be connected using conventional direct parallel wiring or V-shaped wiring. For better protection with direct parallel connection, wiring should be as short as possible, with total length controlled within 0.5m. Connecting conductors should be 25-35mm² multi-core copper cable.

A suitable circuit breaker or fuse must be connected in series ahead of the SPD; the circuit breaker should use C trip characteristics. Power must be disconnected during installation; live operation is strictly prohibited, and connecting conductors must meet the specified requirements.

During normal operation, the status indicator window is white and the NC-COM alarm dry contact is in the conducting state. When the SPD fails, the status indicator turns red and the NC-COM alarm dry contact becomes open. The SPD requires no special maintenance; only periodic checks of module tightness and status indication are needed.

The SPD should be replaced promptly if either of the following occurs: the status indicator turns red, or the alarm dry contact becomes open.

Frequently Asked Questions

What does the status indicator show?

White indicates normal operation; red indicates the SPD has failed and should be replaced.

How is the remote signalling contact configured?

It is a changeover contact with NC-COM normally closed. It conducts during normal operation and opens when the SPD fails.

What conductor size is required?

Connecting conductors should be 25-35mm² multi-core copper cable, and the terminal connection capacity is ≤35mm².

What is the maximum wiring length for parallel connection?

When using direct parallel wiring, total length should be controlled within 0.5m.