GBV-120-385-3+1 FM AC Power Surge Protective Device, Class II, 3+1 Configuration

Description

The GBV-120-385-3+1 FM is a Class II surge protective device (SPD) designed for lightning overvoltage protection of single-phase AC power supplies. It is rated for a nominal operating voltage Un of 220V~ and a maximum continuous operating voltage Uc of 385V~, with a 3+1 pole configuration.

Product Overview

The device limits transient overvoltages on AC power lines through a 3+1 configuration. It provides separate voltage protection levels for the L-N and N-PE paths and includes a status indicator window plus a remote signalling changeover contact for monitoring.

Key Features

• Class II SPD for single-phase AC power supply protection
• Nominal discharge current In: 60kA; maximum discharge current Imax: 120kA
• L-N voltage protection level Up (In@8/20µs): 3.0kV; N-PE Up (In@8/20µs): 2.0kV
• Fast response: L-N tA 25ns; N-PE tA 100ns
• Status indicator window: white = normal, red = failed
• Remote signalling changeover contact: NC-COM-NO (NC-COM normally closed, NO-COM normally open)
• 35mm DIN rail mounting
• PBT housing with UL94-V0 flame retardance rating; IP20 enclosure protection

Technical Specifications

Parameter	Value
Model	GBV-120/385/3+1 FM
SPD classification	II
Nominal operating voltage Un	220V~
Maximum continuous operating voltage Uc	385V~
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
Status indication	White: normal / Red: failed
Mounting	35mm DIN rail
Conductor connection capacity	≤35mm²
Maximum torque	3.5Nm~4.5Nm
Housing material	PBT
Housing flame retardance rating	UL94-V0
Enclosure protection rating	IP20
Remote signalling contact type	Changeover contact, NC-COM-NO; NC-COM normally closed, NO-COM normally open
Remote signalling contact AC rating	250V/0.5A
Remote signalling contact DC rating	125V/0.2A
Remote signalling terminal conductor capacity	≤1.5mm²
Temperature (humidity) range	-40℃ to +80℃, relative humidity ≤95%
Altitude	≤3000m
Main body dimensions (L×H×D)	108mm×90mm×65mm (±1)

Applications

The GBV-120-385-3+1 FM is intended for Class II lightning overvoltage protection of single-phase AC power supplies.

Installation and Use

• The device can be connected by conventional direct parallel wiring or V-shaped wiring. For better protection with direct parallel wiring, keep the wiring as short as possible, with total length controlled within 0.5m.
• Connecting conductors should be 16-35mm² multi-core copper conductors.
• A suitable air circuit breaker or fuse should be connected in series ahead of the SPD; the air circuit breaker should use C trip characteristics.
• Power must be disconnected during installation. Live operation is strictly prohibited, and connecting conductors must meet the requirements.
• During normal operation, the status indicator window is white and the alarm dry contact NC-COM is in the conducting state. When the SPD fails, the status indication turns red and the alarm dry contact NC-COM is in the open state.
• The SPD requires no special maintenance; only periodic checks are needed for module looseness and correct status indication.
• The SPD is considered failed and should be replaced promptly if either of the following occurs: the status indication turns red, or the alarm dry contact becomes open.

Frequently Asked Questions

What does the status indicator window show?

White indicates normal operation; red indicates the SPD has failed.

How is the remote signalling contact configured?

It is a changeover contact with NC-COM-NO terminals: NC-COM is normally closed and NO-COM is normally open. During normal operation NC-COM is conducting; on failure NC-COM becomes open.

What conductor size is required for the main connections?

Use 16-35mm² multi-core copper conductors, with a maximum torque of 3.5Nm~4.5Nm.

What should be installed ahead of the SPD?

A suitable air circuit breaker or fuse should be connected in series ahead of the SPD, with the air circuit breaker using C trip characteristics.