FLT-SEC-T1-350/25-P Phoenix Modular SPD

Bestell-Nr.: 2905471

1. Modellaufschlüsselung

`FLT-SEC-T1-350/25-P`

FLT: FLASHTRAB surge protection series

SEK: SEC PLUS pluggable modular SPD Plattform

T1: Typ 1 (Klasse I) lightning current module; compatible for T1+T2 combined surge protection

350: Maximum continuous operating voltage Uc = 350 V und, geeignet für 230/400 V low-voltage distribution systems

25: Iimp (10/350 μs) = 25 Die

P: Plug-in replaceable module (surge protection cartridge without base)

Protection path: L-N / L-PEN (Line to Neutral / Line to PEN)

❗The N-PE path requires an additional module: FLT-SEC-P-T1-N/PE-350/100-P (2905473)

2. Key Electrical Specifications

3. Mechanische Abmessungen & Konstruktion

Breite: 35.5 mm (2 modules for DIN rail mounting)

Höhe: 46.4 mm

Tiefe: 59.4 mm

Gehäuse: PA6.6-GF flame retardant UL94 V-0, RAL7035 light grey

Installation: Must be plugged into a dedicated SPD base; direct wiring without base is prohibited

4. Important Matching Information
5. Bewerbungsvoraussetzung

Offizielle Spezifikation: This Type 1 module is recommended to be coordinated with VAL-SEC-T2-350-P (Typ 2 varistor module) to achieve proper energy coordination for T1+T2 combination.

2. Reference complete assembled models (unit = base + 4 plug-in modules)

Single-phase 1S system: FLT-SEC-T1+T2-1S-350/25-FM (Base No. 2905466)

3-phase 3S TN-S system: FLT-SEC-T1+T2-3S-350/25-FM (Base No. 2905470)

Internal configuration of complete unit: 3 × FLT-SEC-T1-350/25-P + 1 × FLT-SEC-P-T1-N/PE-350/100-P

3. Meaning of suffix FM: The base is equipped with remote signalling contacts (passive dry contact for fault alarm)
4. Anwendungsbereich

Main distribution rooms of buildings, primary surge protection at utility meter inlet (LPZ0→LPZ1 boundary)

230/400 V TN-S, TN-C-S, TT low-voltage AC power grids

Grid connection points of photovoltaic systems, main incoming surge protection for large factories and data centres

Industrial power distribution systems requiring zero leakage current and hot-swappable maintenance

6. Model Selection Pitfalls
7. Distinguish two similar models

FLT-SEC-T1-350/25-P (2905471, legacy designation)

FLT-SEC-P-T1-350/25-P (2905422, new SEC PLUS designation, identical electrical parameters, base compatible)

2. Purchasing this model separately only supplies the pluggable cartridge, DIN base excluded; energisation without base is not allowed.
3. Additional earthing conditions are required for IT systems; TN wiring schemes cannot be directly adopted.
4. If prospective short-circuit current of the system exceeds 3 Die (bei 350 V operating condition), short-circuit protection fuses must be fitted upstream.

Application Scope of FLT-SEC-T1-350/25-P (Phoenix Type 1 Plug-in SPD Cartridge)

Fundamental specification: Typ 1 (Klasse I) Überspannungsschutzgerät, Iimp=25 kA (10/350 μs), Uc=350 V AC, für 230/400 V low-voltage AC systems. Plug-in module requiring matching base; frequently combined with Type 2 SPD for T1+T2 primary & secondary coordinated protection.

1. Empfohlene Anwendungsszenarien

1.1 Low-Voltage Power Distribution for Buildings (LPZ0→LPZ1 Lightning Protection Zone Boundary)

1) Main distribution rooms of commercial & Wohngebäude, main incoming cabinets at utility meter front end for primary surge protection

Applicable for TN-S, TN-C-S distribution systems.

Typical projects: Bürogebäude, Einkaufszentren, Hotels, Krankenhäuser, main distribution cabinets of residential communities.

2) Main incoming cabinets of industrial plants, low-voltage side of factory main substations.

1.2 Infrastructure Industry

Schienenverkehr: Power distribution rooms, mains incoming protection for signal rooms

Kommunikationsbasisstationen, edge data centres, external mains incoming cabinets of IDC computer rooms

Flughäfen, Häfen, low-voltage main power distribution in logistics parks

1.3 AC Side of New Energy Facilities

Low-voltage grid connection cabinets for commercial & industrial photovoltaic power stations (surge protection on 400 V AC incoming side)

⚠ Not applicable for PV DC circuits; special DC SPDs shall be adopted for direct current applications.

Power distribution cabinets at AC output of energy storage PCS units

1.4 Critical Automation & Security Projects

Main power incoming cabinets for DCS and PLC control systems in large factories;

Smart parks, large pump stations, main control power cabinets of wastewater treatment plants.

2. Applicable Earthing System Types

✅ Supported: TN-S, TN-C-S 230/400 V 3-phase 5-wire / 3-phase 4-wire systems

✅ TT earthing systems (the N-PE circuit must be equipped with FLT-SEC-P-T1-N/PE-350/100-P neutral SPD)

❌ Not recommended for direct use in IT systems (neutral-less system; technical verification with Phoenix Contact support is mandatory)

3. Suitable Lightning Risk Environment

Iimp=25 kA fits the following conditions:

1. Buildings located in moderate thunderstorm regions (annual thunderstorm days: 30～60 days)
2. Buildings without complete external lightning rods and down conductors with high direct lightning strike risk
3. Projects mandatorily requiring Type 1 tested SPDs as specified in national standard GB 50057.

For severe thunderstorm areas (high lightning density zones, isolated factories in open areas), upgrade to the 50 kA Iimp variant.

4. Application Advantages Derived from Product Features
5. Hot-swappable module replacement

Ideal for facilities that cannot sustain long power outages: Hospitals with critical loads, continuous manufacturing plants, 7×24-hour operating computer rooms. Cartridge can be replaced directly without removing the complete SPD during faults.

2. Zero continuous leakage current

Suitable for upstream metering positions (no extra power consumption for electricity meters).

3. Optional FM base with remote signalling

Applicable for remotely monitored computer rooms and intelligent projects to transmit SPD fault alarms to upper control systems.

5. Ungeeignete Anwendungsszenarien (Critical Warnings)
6. ❌ DC circuits (PV DC, battery DC, 24 V industrial control DC power supply; mismatch of specifications)
7. ❌ Terminal distribution boxes at load side (only Type 2 secondary SPD is required for terminals; Typ 1 leads to excessive cost and over-specification)
8. ❌ Non-standard low-voltage power grids of 110 V oder 600 V (Uc=350 V does not match operating voltage)
9. ❌ Explosion-hazardous areas (this series has no explosion-proof certification; Phoenix Contact explosion-proof SPD series shall be selected)
10. ❌ Sole purchase of cartridges without original base for direct wiring (violates electrical safety specifications)
11. ❌ Small buildings and low lightning risk projects where only Type 2 SPD is required per code; Typ 1 installation is unnecessary.
12. Reference Standard Configuration

Standard 3-phase TN-S 400 V main incoming configuration:

3 pcs × FLT-SEC-T1-350/25-P (L1/L2/L3 phases)

+1 pc × FLT-SEC-P-T1-N/PE-350/100-P (N-PE)

Mounted on FLT-SEC series base to form a complete Type 1 Überspannungsschutz. In engineering practice, Typ 2 SPDs are generally installed downstream to realise T1+T2 energy coordination.

Dimension Specifications for FLT-SEC-T1-350/25-P (Bestell-Nr. 2905471)

⚠ Distinction must be made between plug-in cartridge (this single component) and complete assembly (Base + Module). Dimensions shall be differentiated for cabinet layout and panel design.

6.1 Standalone Plug-in SPD Cartridge (FLT-SEC-T1-350/25-P)

1. Gesamtabmessungen (B × H × T)

Breite: 23.5 mm

Höhe: 46.4 mm

Tiefe: 59.4 mm

2. DIN rail module width: 2 Module (2 Div.)
3. Nettogewicht: 151.8 G

Only replaceable plug-in cartridge. Installation without dedicated base is prohibited.

6.2 Dimensions of Complete Assemblies with Base (Reference for Cabinet Layout)

All bases fit standard 35 mm DIN-Schiene:

1) FLT-SEC-T1+T2-1S-350/25-FM (Single-phase 1S, 2-module base)

W: 71.2 mm｜H: 95.2 mm｜D: 74.5 mm

2) FLT-SEC-T1+T2-2S-350/25-FM (2-phase 2S, 6-module base)

W: 106.8 mm｜H: 95.2 mm｜D: 74.5 mm

3) FLT-SEC-T1+T2-3S-350/25-FM (Most commonly used for 3-phase TN-S, 8-module base)

Breite: 142.4 mm

Höhe: 95.2 mm

Tiefe: 74.5 mm

6.3 Cabinet Layout Guidelines

1. A full 3-phase TN-S set (3 × FLT-SEC-T1-350/25-P + 1 × FLT-SEC-P-T1-N/PE-350/100-P) installed on an 8-module base occupies a total width of 142.4 mm.
2. Ingress protection rating: Assembled unit IP20, suitable for indoor installation inside electrical cabinets only.
3. Heat dissipation clearance: Maintain minimum 25 mm free space above and below the SPD.
4. Terminal cable specification: 2.5~35 mm² solid conductors; tightening torque = 4.5 N·m。