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April 25, 2025| | 0 Comment

Surge Protection Device BR 30FU 4P 30KA SPD Specifications

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# Surge Protection Device BR 30FU 4P 30KA SPD Specifications

## Introduction to Surge Protection Devices (SPDs)

Surge Protection Devices (SPDs) are essential components in modern electrical systems, designed to protect equipment from voltage spikes and transient surges. The BR 30FU 4P 30KA SPD is a high-performance device that offers reliable protection for three-phase electrical systems. This article provides a comprehensive overview of its specifications, features, and applications.

## Key Features of BR 30FU 4P 30KA SPD

The BR 30FU 4P 30KA SPD stands out in the market due to its robust design and advanced protection capabilities. Here are its primary features:

– Maximum Discharge Current (Imax): 30kA
– Nominal Discharge Current (In): 15kA
– Voltage Protection Level (Up): ≤1.8kV
– Response Time: <25ns
– Number of Poles: 4 (3 phases + neutral)
– Operating Voltage: 230/400V AC
– Frequency: 50/60Hz

## Technical Specifications

### Electrical Characteristics

The BR 30FU 4P 30KA SPD is designed for three-phase systems with the following electrical parameters:

Parameter | Value
Rated Voltage (Uc) | 320V AC
Maximum Continuous Operating Voltage (Uc) | 320V AC
Short-Circuit Current Rating | 25kA
Backup Fuse Recommendation | 63A gL/gG
Protection Class | Type 2 (Class C)

### Mechanical Specifications

The device features a compact and durable design:

– Housing Material: Thermoplastic (UL94 V-0)
– Mounting: DIN rail (35mm)
– Dimensions: 90 x 72 x 65mm (WxHxD)
– Weight: Approximately 500g
– Connection: Screw terminals (25mm² max)
– Operating Temperature: -40°C to +80°C
– Storage Temperature: -40°C to +85°C

## Protection Mechanism

The BR 30FU 4P 30KA SPD utilizes metal oxide varistors (MOVs) as its primary protection component. These MOVs respond to voltage surges by changing their resistance characteristics:

– When normal voltage is present, the MOVs exhibit high resistance
– During a surge event, the resistance drops dramatically to divert excess current
– After the surge passes, the MOVs return to their high-resistance state

The device includes thermal disconnectors that isolate faulty modules, preventing fire hazards and maintaining system protection even if individual components fail.

## Installation Guidelines

Proper installation is crucial for optimal performance:

– Location: Install at the main distribution board or sub-distribution level
– Mounting: Secure on 35mm DIN rail in vertical position
– Wiring: Use appropriate cable sizes (min 4mm², max 25mm²)
– Grounding: Ensure low-impedance connection to earth (≤0.1Ω recommended)
– Clearance: Maintain minimum 50mm space around the device for heat dissipation
– Sequence: Connect phase wires first, then neutral, and finally ground

## Maintenance and Monitoring

The BR 30FU 4P 30KA SPD includes visual indicators for easy maintenance:

– Green LED: Normal operation
– Red LED: End-of-life indication (requires replacement)
– Remote signaling contacts: Optional for integration with monitoring systems

Regular inspection is recommended:

– Visual check every 6 months
– Functional test annually
– Replacement after significant surge events or when indicators show end-of-life

## Applications

This SPD is suitable for various applications:

– Industrial facilities
– Commercial buildings
– Data centers
– Healthcare institutions
– Telecommunication systems