Phoenix FLT Series Surge Protector Product Selection Guide

In the stable operation of industrial automation and power systems, surge protection is an indispensable key link. As a world-renowned supplier of industrial electronic components, Phoenix's FLT series surge protectors have become the preferred solution for numerous industrial scenarios with their excellent protection performance and stable product quality. This article compiles the product codes, specifications and product descriptions of various popular models of the FLT series, helping procurement, technical and operation and maintenance personnel quickly complete model selection and matching.

1. FLT Series Surge Protector Core Model List (Including Product Descriptions)

For easy reference, the following is a table of product codes, models and product descriptions of different specifications of the FLT series, covering the protection needs of various voltage levels and wiring methods:

2. Quick Interpretation of Model Specifications

The suffix parameters of the FLT series models contain key product information. Mastering the following rules can quickly determine the applicable scenarios of the product:

1. Series Identification: Such as FLT 25/35/50/60/100, representing different rated voltages and protection levels, suitable for different scenarios such as low-voltage power distribution and industrial control.
2. Wiring Method: /3 represents three-phase wiring, /3+1 represents three-phase plus neutral line wiring, and N/PE refers to surge protection between the neutral line and protective earth.
3. Control Type: Models with the "CTRL" suffix are control-type surge protectors, which have precise voltage response characteristics and are suitable for control circuits requiring high sensitivity.
4. Parameter Suffix: Such as CTRL-1.5, -0.9/I, etc., representing core technical parameters of the product such as maximum continuous operating voltage and response time, which need to be matched according to on-site working conditions.
5. Function Identification: Models with the "I" suffix are equipped with an optical fault indicator, which can provide real-time feedback on product working status and facilitate operation and maintenance troubleshooting.

3. Working Principle of Surge Protectors

The core function of a surge protector is to limit transient overvoltage and safely discharge surge current to the ground, thereby protecting subsequent electrical equipment from surge impacts caused by lightning, power grid fluctuations and other factors. The working process of the FLT series surge protectors can be divided into three stages:

1. High-Impedance State Under Normal Working ConditionsWhen the power grid voltage is within the rated range, the core components inside the surge protector (such as varistors and discharge gaps) are in a high-impedance state, with almost no current conduction, only weak leakage current exists, which will not affect the normal power supply of the system.
2. Rapid Conduction When Surge OccursWhen transient overvoltage occurs in the power grid caused by lightning induction, switch operation and other factors, and the voltage value exceeds the starting voltage of the surge protector, the internal core components will quickly switch from a high-impedance state to a low-impedance state within nanoseconds, forming a temporary current discharge channel. At this time, the surge current will be quickly guided to the ground through the surge protector, avoiding the current flowing into the subsequent precision equipment.For control-type models with the "CTRL" suffix, their starting voltage accuracy is higher, which can respond immediately when the overvoltage just reaches the threshold, suitable for control circuits sensitive to voltage fluctuations.
3. Automatic Reset After Surge SubsidesWhen the transient overvoltage disappears and the power grid voltage returns to the rated range, the internal core components will automatically return to the high-impedance state, and the surge protector will return to the standby state, waiting for the next surge impact. The FLT series products have stable reset performance, can withstand multiple surge impacts repeatedly, and do not need frequent replacement.

4. Core Advantages of FLT Series Products

1. High Reliability: Phoenix's FLT series products have passed rigorous industrial environment tests and can operate stably under complex working conditions such as high temperature, high humidity and strong electromagnetic interference.
2. Comprehensive Protection: Covering the full range of wiring needs from single-phase to three-phase, it can effectively suppress voltage impacts caused by lightning surges, power grid fluctuations, etc., and protect subsequent precision equipment.
3. Easy Installation and Maintenance: The products adopt a standardized design, compatible with Phoenix's terminal blocks and mounting rails, enabling quick plug-in and replacement, and reducing operation and maintenance costs.
4. Precise Response: Control-type models (with the CTRL suffix) have a more accurate starting voltage threshold, which can specifically protect control circuits sensitive to voltage fluctuations and avoid false triggering or response lag.
5. Visible Status: Models with the "I" suffix are equipped with an optical fault indicator, providing real-time feedback on working status, facilitating operation and maintenance personnel to detect faults and replace them in a timely manner.

5. Selection Suggestions

1. Prioritize selecting the corresponding series (such as 25/35/100 series) according to the on-site voltage level, and then determine the specific model according to the wiring method.
2. For control circuits, it is recommended to select models with the "CTRL" suffix; for power distribution circuits, conventional models can be selected according to the surge level.
3. For key equipment or scenarios with high operation and maintenance difficulty, priority should be given to models with a fault indicator (I suffix) to facilitate status monitoring.
4. If there are special working conditions (such as high altitude, strong corrosion environment), it is recommended to refer to the product technical manual or consult professional engineers for model selection.

If you encounter any problems in the selection or application of FLT series products, please feel free to consult us, and we will provide you with professional technical support and solutions.