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 AC power 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 nominal discharge current In of 60kA and a maximum discharge current Imax of 120kA.

Product Overview

The GBV-120-385-3+1 FM uses a 3+1 pole configuration. Its L-N voltage protection level Up is 3.0kV and its N-PE voltage protection level Up is 2.0kV, both measured at In under an 8/20µs waveform. Response time tA is 25ns for L-N and 100ns for N-PE. The device is intended for installation on a 35mm DIN rail.

Key Features

• Class II surge protection for single-phase AC power supplies
• Nominal discharge current In: 60kA; maximum discharge current Imax: 120kA
• Maximum continuous operating voltage Uc: 385V~
• L-N voltage protection level Up: 3.0kV; N-PE voltage protection level Up: 2.0kV (In @ 8/20µs)
• Status indicator: white for normal operation, red for failure
• Remote signaling changeover contacts: NC-COM-NO, with NC-COM normally closed and NO-COM normally open
• PBT housing with UL94-V0 flame-retardant 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-retardant rating	UL94-V0
Enclosure protection rating	IP20
Remote signaling contact type	Changeover contact, NC-COM-NO; NC-COM normally closed, NO-COM normally open
Remote signaling contact AC performance	250V/0.5A
Remote signaling contact DC performance	125V/0.2A
Remote signaling contact terminal conductor capacity	≤1.5mm²
Temperature and humidity range	-40℃ to +80℃, relative humidity ≤95%
Altitude	≤3000m
Main body dimensions (L × H × D)	144mm × 90mm × 67mm (±1)

Applications

The GBV-120-385-3+1 FM is used for Class II lightning overvoltage protection of single-phase AC power supplies. It is suitable for installation in AC power distribution systems where surge protection is required at the equipment or distribution level.

Installation and Use

The device can be connected using conventional direct parallel wiring or V-shaped wiring. For better protection with direct parallel wiring, the connection conductors should be as short as possible, with a total length controlled within 0.5m. Connection conductors should be 16-35mm² multi-core copper conductors.

A suitable circuit breaker or fuse should be connected in series ahead of the SPD. The circuit breaker should have a C trip characteristic. The power supply must be disconnected during installation; live operation is strictly prohibited. The connection conductors must meet the specified requirements.

During normal operation, the status indicator window should be white and the alarm dry contact NC-COM should be in the conducting state. When the SPD fails, the status indicator turns red and the alarm dry contact NC-COM becomes an open circuit.

The SPD requires no special maintenance. Regular checks should be made to confirm that the module is not loose and that the status indication is normal. The SPD should be replaced promptly if either of the following occurs: the status indicator turns red, or the alarm dry contact becomes an open circuit.

Frequently Asked Questions

What does the status indicator show?

The status indicator window is white during normal operation and turns red when the SPD has failed.

How is the remote signaling contact configured?

The remote signaling contact is a changeover contact with NC-COM-NO terminals. NC-COM is normally closed and NO-COM is normally open. The contact is rated for 250V/0.5A AC and 125V/0.2A DC.

What conductor size is required?

Connection conductors should be 16-35mm² multi-core copper conductors. The terminal conductor connection capacity is ≤35mm², and the remote signaling contact terminal capacity is ≤1.5mm².

When should the SPD be replaced?

The SPD should be replaced when the status indicator turns red or when the alarm dry contact becomes an open circuit.