GDV-20/385/3+1 FM Three-Phase AC Power SPD, Class II, 20 kA with Remote Signaling

Description

The GDV-20/385/3+1 FM is a Class II surge protective device (SPD) designed for lightning overvoltage protection of three-phase AC power supplies. It is configured as a 3+1 pole arrangement, providing L-N protection and an N-PE path, and is intended for installation on a 35 mm DIN rail.

Product Overview

The SPD limits transient overvoltages on three-phase AC circuits. Its nominal discharge current In is 10 kA and its maximum discharge current Imax is 20 kA. The L-N voltage protection level Up (at In, 8/20 µs) is ≤1.5 kV, and the N-PE voltage protection level Up (at In, 8/20 µs) is ≤1.0 kV. Response time tA is 25 ns for L-N and 100 ns for N-PE.

Status indication is provided for both L-N and N-PE paths: green indicates normal operation and red indicates a failed state. A changeover remote signaling contact allows the operating state to be monitored remotely.

Key Features

• Class II SPD for three-phase AC power overvoltage protection
• 3+1 pole configuration with L-N and N-PE protection paths
• Nominal discharge current In: 10 kA; maximum discharge current Imax: 20 kA
• L-N voltage protection level Up ≤1.5 kV; N-PE voltage protection level Up ≤1.0 kV
• Response time tA: 25 ns (L-N), 100 ns (N-PE)
• Green/red status indication for normal and failed states
• Changeover remote signaling contact
• 35 mm DIN rail mounting
• Housing material PC+ABS with UL94-V0 flame rating
• IP20 enclosure protection

Technical Specifications

Parameter	Value
Model	GDV-20/385/3+1 FM
SPD classification	II
Nominal operating voltage Un	220V~
L-N maximum continuous AC operating voltage Uc	385V~
N-PE maximum continuous AC operating voltage Uc	255V~
Nominal discharge current In	10kA
Maximum discharge current Imax	20kA
L-N voltage protection level Up (In@8/20µs)	≤1.5kV
N-PE voltage protection level Up (In@8/20µs)	≤1.0kV
L-N response time tA	25ns
N-PE response time tA	100ns
L-N, N-PE status indication	Green: normal / Red: failed
Mounting method	35mm DIN rail
Conductor connection capacity	≤25mm²
Maximum torque	3.2Nm~3.7Nm
Housing material	PC+ABS
Housing material flame rating	UL94-V0
Remote signaling contact type	Changeover contact
Remote signaling contact AC rating	250V/0.5A
Remote signaling contact DC rating	125V/0.2A
Enclosure protection rating	IP20
Temperature (humidity) range	-40℃ to +80℃, relative humidity ≤95%
Altitude	≤3000m
Main body dimensions	90mm×65.3mm×72mm (tolerance ±1 mm)

Applications

The GDV-20/385/3+1 FM is used for Class II lightning overvoltage protection of three-phase AC power supplies. It is suitable for installation at the AC power intake of equipment and systems requiring surge protection on L-N and N-PE paths.

Installation and Use

• The SPD may be connected in the conventional direct parallel arrangement. For better protection, keep the connecting conductors as short as possible, with a total length controlled within 0.5 m.
• Connecting conductors should be multi-core copper conductors of 6 mm² or larger.
• A suitable circuit breaker or fuse must be connected in series ahead of the SPD. For a circuit breaker, use a C tripping characteristic.
• The power supply must be disconnected before installation. Live operation is strictly prohibited, and connecting conductors must meet the requirements.
• During normal operation, the status indicator should be green.
• The SPD requires no special maintenance; periodically check whether the module is loose and whether the status indication is normal.
• The SPD is considered failed and must be replaced promptly if either of the following occurs: the status indication turns red, or the alarm dry contact changes to an open-circuit state.

Frequently Asked Questions

What does a red status indicator mean?

A red status indication means the SPD has failed and should be replaced promptly. A green indication means normal operation.

How is the SPD mounted?

The device is mounted on a 35 mm DIN rail.

What conductor size and torque are specified?

The conductor connection capacity is ≤25 mm², and the maximum torque is 3.2 Nm to 3.7 Nm. Installation conductors should be multi-core copper conductors of 6 mm² or larger.

What are the remote signaling contact ratings?

The remote signaling contact is a changeover contact rated 250V/0.5A AC and 125V/0.2A DC.