Phoenix FLT Series Industrial Surge Protection Devices Complete Selection Guide

I. Series Overview: Industrial-Grade Surge Protection for Control & Power Circuits

The Phoenix FLT series is a comprehensive portfolio of industrial surge protection devices (SPDs) designed to safeguard automation control systems, power distribution circuits, and critical industrial equipment from transient overvoltages caused by lightning strikes, switching surges, and grid fluctuations. This series covers multiple core product lines tailored to different application scenarios:

• FLT-PLUS CTRL Series: Low-current surge protectors for control circuits, with rated current grades of 0.9A/1.5A/2.5A/3.0A and optional remote signaling (I suffix) functionality.
• FLT-PLUS Series: Basic surge protection modules for general industrial scenarios, featuring compact design and plug-and-play installation.
• FLT-MB Series: Dedicated mounting bases for surge protectors, supporting secure DIN rail installation and system expansion.
• FLT-ISG-100-EX Series: Explosion-proof surge protectors for hazardous areas, complying with relevant explosion-proof safety standards.
• FLT-EE-T1 Series: T1-class testable surge protection modules for high-reliability power systems.
• FLT-CP/CP-PLUS Series: Three-phase/single-phase surge protectors for power circuits, with a maximum continuous operating voltage of 350VAC, covering multiple phase configurations (3S/3C/2S/2C/1S/1C).

All FLT series models feature fast response time (≤25ns), wide temperature tolerance (-40°C to +85°C), and DIN rail mounting compatibility, seamlessly integrating with Phoenix control modules, terminal blocks, and enclosure systems to form a complete industrial surge protection ecosystem.

Core Advantages

1. Multi-Scenario Coverage: From low-current control circuits to high-power power systems, from general industrial environments to explosive hazardous areas, meeting diverse surge protection needs.
2. Flexible Functional Configuration: Optional remote signaling (I suffix) enables real-time monitoring of SPD status; pluggable design allows for quick replacement without power outage.
3. High Protection Performance: Fast response to transient overvoltages, low residual voltage, and high surge current absorption capacity, effectively protecting downstream equipment.
4. Industrial-Grade Reliability: Reinforced housing with vibration resistance and corrosion resistance, stable operation in harsh industrial environments such as high noise and high humidity.

II. Model Nomenclature Decoding: Understand the FLT Series Structure

The FLT series adopts a standardized naming convention to clearly distinguish product type, specification, and functional characteristics. The core model format is as follows:

1. FLT-PLUS CTRL Series Format

FLT-PLUS CTRL-[Rated Current]-[Function Suffix]

• FLT-PLUS CTRL: Low-current control circuit surge protector identifier
• Rated Current: 0.9/1.5/2.5/3.0A, matching the current level of the protected control circuit
• Function Suffix: I = with remote signaling function (status monitoring and alarm output); No suffix = basic surge protection function

2. FLT-CP/CP-PLUS Series Format

FLT-CP[PLUS]-[Phase Configuration]-[Rated Voltage]

• FLT-CP/CP-PLUS: Power circuit surge protector identifier (CP-PLUS = enhanced version)
• Phase Configuration:
  • 3S: 3-phase, no neutral line
  • 3C: 3-phase, with neutral line
  • 2S: 2-phase, no neutral line
  • 2C: 2-phase, with neutral line
  • 1S: Single-phase, no neutral line
  • 1C: Single-phase, with neutral line
  • N/PE: Neutral line to protective earth protection
• Rated Voltage: 350 = maximum continuous operating voltage 350VAC; ST = pluggable type; BE = special specification for basic protection

3. Other Series Key Suffixes

• EX: Explosion-proof certification suffix (for hazardous area applications)
• T1: T1-class surge protection (meets IEC 61643-11 T1 test requirements)
• UT: Universal terminal connection; R: Remote signaling function
• KY/4: 4-channel surge protection module for special control scenarios

Example Decoding:

• FLT-PLUS CTRL-2.5/I (2800122) = FLT-PLUS CTRL series, 2.5A rated current, with remote signaling function, for control circuit surge protection
• FLT-CP-PLUS-3S-350 (2882640) = FLT-CP-PLUS enhanced series, 3-phase no neutral line, 350VAC rated voltage, for power circuit surge protection

III. Complete Product Catalog: Detailed Parameter Table

Strictly aligned with your part number list, the series is categorized by product type for clear differentiation, with core parameters, features, and application scenarios for direct engineering and procurement reference.

IV. Technical Core: Materials, Performance & Installation

1. Core Materials & Protection Principle

• Protection Components: Metal Oxide Varistors (MOV) for low-current control circuits; Gas Discharge Tubes (GDT) + MOV hybrid components for power circuits, achieving fast response and high surge current absorption.
• Housing Material: Reinforced polyamide (PA) for general models; Flame-retardant PA (UL94 V0) for explosion-proof models, with corrosion and UV resistance.
• Internal Structure: Pluggable module design, with status indicator (green = normal, red = failure) for quick fault identification.

2. Key Performance Parameters

3. Standard Installation Procedure

1. Mounting: Fix the SPD or mounting base on the NS 35/7.5 DIN rail, ensuring firm installation without loosening.
2. Wiring: Connect the power/control circuit wires to the SPD terminals according to the phase configuration, tightening the screws to the specified torque (2-4 Nm).
3. Remote Signaling Wiring (I suffix models): Connect the remote signaling terminals to the monitoring system to realize real-time status feedback.
4. Inspection: Power on and check the status indicator (green = normal); conduct a surge test periodically to verify protection performance.

V. Application Scenarios & Model Selection Guide

1. Typical Application Scenarios

2. 4-Step Quick Selection Technique

Step 1: Confirm the Protected Circuit Type

• Control circuit (current ≤3.0A) → Select FLT-PLUS CTRL series
• Power circuit (voltage 350VAC, single/3-phase) → Select FLT-CP/CP-PLUS series
• Hazardous area application → Select FLT-ISG-100-EX
• Multi-channel control protection → Select FLT-PLUS CTRL/KY/4

Step 2: Match Rated Current/Voltage

• Control circuit: Match the rated current of the protected circuit (0.9A/1.5A/2.5A/3.0A)
• Power circuit: Confirm the phase configuration (3S/3C/2S/2C/1S/1C) and ensure the rated voltage (350VAC) matches the system voltage

Step 3: Select Functional Requirements

• Need real-time status monitoring → Select models with I suffix (remote signaling)
• Need quick replacement without power outage → Select ST suffix (pluggable type)
• Need high reliability for critical systems → Select CP-PLUS enhanced series

Step 4: Confirm Installation Compatibility

• Ensure the mounting base matches the SPD model (e.g., FLT-MB series for T1 class SPDs)
• Verify the DIN rail size (NS 35/7.5) to avoid installation mismatch

VI. Conclusion: Comprehensive Surge Protection for Industrial Systems

The Phoenix FLT series provides a one-stop surge protection solution covering control circuits, power systems, and hazardous areas, with diversified product models and flexible functional configurations to meet the protection needs of different industrial scenarios. The combination of fast response speed, high surge current capacity, and industrial-grade reliability effectively reduces equipment damage caused by transient overvoltages, improves the stability of automation systems, and reduces unplanned downtime.