Un cabinet de télécommunications extérieur nécessite généralement plus d'un SPD. Protégez chaque ligne conductrice AC, DC, Ethernet et signal selon sa tension réelle, son interface, sa position d'installation et son arrangement de mise à la terre.
Table des matières
Quel protection contre les surtensions un cabinet de télécommunications extérieur nécessite-t-il ?
Commencez par identifier chaque câble conducteur entrant ou sortant de l'enveloppe. Ne commencez pas par sélectionner un SPD à usage général.
L'alimentation CA, l'alimentation CC basse tension et les circuits de télécommunications ou de signalisation sont couverts par différentes exigences de SPD et cadres d'essai. [1] [2] [3]
Entrée AC
Protège l'alimentation de service, la distribution CA et l'entrée du redresseur.
48V / -48V CC
Protège la sortie du redresseur, le bus de batterie et la distribution CC.
Ethernet
Protège les lignes de données en cuivre tout en prenant en charge la vitesse requise et l'agencement PoE.
RS485 et capteurs
Protège les circuits de surveillance, d'alarme, de contrôle et des capteurs environnementaux. .
Alarme à distance
Signale un changement d'état d'un SPD au système de surveillance du cabinet.
Architecture de protection contre les surtensions pour cabinet de télécommunications extérieur
Examinez chaque ligne conductrice traversant la limite du cabinet. Placez le SPD pertinent près du point d'entrée ou de distribution des câbles.
Les SPD, l'enceinte du cabinet et les écrans de câble pertinents doivent être intégrés dans la conception de mise à terre et de liaison du projet. [5] [6]
Matrice de sélection de SPD pour cabinet de télécommunications extérieur
Définissez le circuit protégé avant de comparer les modèles des fournisseurs. Les produits qui s'adaptent au même rail DIN peuvent encore servir à des applications complètement différentes.
| Interface de cabinet | Catégorie SPD typique | Équipements protégés | Paramètres à confirmer | Erreur d'achat commune |
|---|---|---|---|---|
| Entrée de l'utilitaire AC | Type 1+2 ou Type 2 SPD AC selon la conception du projet | Distribution AC, redresseur, ventilateur, chauffage et charges AC auxiliaires | Tension, phases, système de mise à la terre, Uc, Iimp éventuellement, In, Imax, Up, pôles et protection de secours | Sélection uniquement à partir de la tension nominale AC |
| Bus DC 48V / -48V | SPD DC basse tension adapté au système DC de télécommunications réel | Sortie du redresseur, bus de batterie, distribution DC et charges de télécommunications | Tension continue maximale, polarité, conducteur relié, Uc, classe de décharge, Up et disposition des pôles | Sélection uniquement à partir de la description nominale “48V” |
| RJ45 Ethernet | SPD de ligne de données RJ45 | Commutateur Ethernet, routeur, passerelle, caméra, radio et contrôleur | Vitesse de données, catégorie de câble, blindage, paires protégées, agencement des connecteurs et pertes d'insertion | En supposant que chaque SPD RJ45 prend en charge l'Ethernet Gigabit |
| Ligne PoE | SPD RJ45 compatible avec l'agencement PoE requis | Caméra extérieure, point d'accès sans fil et dispositif alimenté par PoE | Méthode PoE, puissance, paires alimentées, courant, vitesse et blindage | En supposant que chaque SPD de données prend en charge la puissance PoE requise |
| RS485, capteur ou alarme | SPD de ligne de signal adapté à l'interface | RTU, contrôleur, capteur, alarme de porte et entrée/sortie à distance | Tension de signal, courant, nombre de paires, protocole, taux de transmission, blindage et terminaux | Remplacer un SPD de signal par un SPD d'alimentation CC |
| Sortie d'état SPD | SPD avec contact distant sans potentiel | NMS, PLC, RTU ou contrôleur d'alarme de cabinet reçoit le signal | Logique COM, NO et NC, cote de contact et état normal/échec | Commander une version standard sans signalisation à distance |
Sélection de SPD pour entrée AC
Le SPD AC protège l'alimentation électrique entrante et le côté AC du redresseur. La sélection et la coordination doivent suivre le système AC réel, la position d'installation et le concept de protection du projet. [1] [8]
Sélection de SPD 48V / -48V DC
“48V” is a nominal system description. The real DC bus voltage may be higher during rectifier operation and battery charging.
Select the SPD from the highest continuous DC voltage, polarity, bonded conductor, protection modes and installation position. IEC 61643-41:2025 provides the test framework for SPDs connected to low-voltage DC circuits. [2]
Confirm voltage
Provide nominal voltage, rectifier range, battery charging range and the highest continuous voltage.
Confirm polarity
Identify DC+, RTN, DC− or −48V, PE and the conductor bonded to the cabinet earth.
Confirm location
State whether the SPD is at the incoming feeder, rectifier output, battery bus or DC distribution unit.
Confirm maintenance
Specify visual indication, replaceable modules and remote signalling where required.
Read the detailed 48V / −48V DC SPD for telecom guide for the complete voltage and protection-mode process.
Protection contre les surtensions RJ45 et PoE
An RJ45 connector does not define the complete technical requirement.
IEC 61643-21:2025 covers telecommunications and signalling network SPDs, including networks carrying power on the same line, such as Power over Ethernet. [3]
Continue with the RJ45 surge protector selection guide et le PoE surge protection guide .
Protection des lignes RS485, capteurs et surveillance
Outdoor telecom cabinets often contain door alarms, environmental sensors, battery monitoring and remote-control interfaces.
Select the signal SPD from the protocol, voltage, pair count, current, transmission requirement and terminal arrangement.
RS485 communication
Confirm signal voltage, pair count, data rate, current and cable shielding.
Door and alarm lines
Review door contacts, security wiring and any control conductor extending outside the cabinet.
Environmental sensors
Match the SPD to the sensor supply, output signal, conductor number and grounding method.
See the RS485 surge protector selection guide for protocol-specific guidance.
Contact d'alarme à distance pour l'état du SPD
A visual indicator requires a site visit. An optional potential-free contact allows the monitoring system to receive an SPD status change remotely.
Define the logic
Confirm which contact state represents normal operation, module removal or SPD failure.
Check the rating
Verify that the controller input voltage and current are within the contact rating.
Test commissioning
Verify the complete alarm path from the SPD to the remote monitoring platform.
See the SPD remote alarm and PLC wiring guide .
La mise à la terre et le lien affectent la protection obtenue
The internal cabinet grounding bar must be integrated into the wider site earthing and bonding system.
ITU-T K.56 and K.112 provide telecommunications-sector guidance related to lightning protection, earthing and bonding for radio base station environments. [5] [6]
Use coordinated bonding
Integrate the SPDs, metal enclosure and relevant cable shields into the project bonding design.
Keep paths short
Avoid long conductors, unnecessary loops and indirect routes between the SPD and grounding bar.
Separate cable routes
Avoid routing incoming unprotected conductors beside protected outgoing conductors.
Connect to site earth
An internal copper bar cannot replace a complete site earthing system.
Related resources: SPD connection cable length et SPD grounding requirements .
L'indice de protection IP et la condensation sont des questions différentes
An IP-rated enclosure can protect against defined dust and water ingress conditions. It does not automatically solve internal condensation.
IEC 60529 defines enclosure degrees of protection using the IP Code. The classification does not define the complete internal temperature, humidity or condensation-control strategy. [7]
External ingress control
- Cabinet IP classification
- Door seals and gaskets
- Cable glands and entry plates
- Rain hood and drainage design
- Corrosion-resistant materials
- UV, salt-air and pollution exposure
Internal climate control
- Day and night temperature changes
- Humidity and dew-point conditions
- Heating or dehumidification
- Ventilation or heat exchanger
- Cold surfaces and thermal bridges
- Moisture and corrosion inspection
Familles de produits typiques LEEYEE pour cabinets de télécommunications
This mapping helps buyers identify the likely product family. It is not a universal model-substitution table.
Ce que les acheteurs devraient vérifier au-delà de la fiche technique
A technically suitable SPD still needs product documentation, manufacturing control and sample confirmation before bulk ordering.
Component and product testing
LEEYEE testing capability includes MOV and GDT testing, impulse equipment, thermal stability testing and combination-wave testing. Applicable tests depend on the product category and test plan.
Document-scope confirmation
Confirm that the datasheet, certificate or report applies to the exact model, voltage, pole arrangement and declared ratings being ordered.
Approbation d'échantillon
Verify terminal arrangement, DIN-rail space, remote contact, labels and replacement modules before bulk production.
Maintenance des SPD et remplacement de module
Plan routine inspections, remote alarm tests and compatible module replacement without rebuilding the cabinet distribution section.
IEC 61643-22 addresses selection, location, coordination and operational considerations for telecommunications and signalling network SPDs. [4]
Routine Inspection
Check status indicators, terminals, wiring, overheating, contamination, moisture and corrosion.
Remote Alarm Test
Verify that the monitoring system receives the intended normal and failure states.
Module Replacement
Use the compatible replacement cartridge specified for the installed base, voltage and protection characteristics.
Post-Surge Check
Inspect the SPDs, terminals, grounding conductors and protected equipment after a known severe surge event.
Informations à envoyer avant de demander un devis
These details allow the supplier to compare the same engineering requirement and reduce model-selection errors.
Besoin d'une recommandation initiale de SPD ?
Send the cabinet drawing, AC input, highest continuous DC voltage, RJ45 or PoE requirements, signal-line list, grounding layout and expected quantity.
Soutien pour l'OEM de cabinet de télécommunications et approvisionnement de projet
LEEYEE is a specialized surge protection and low-voltage protection supplier, trusted for solar PV, power distribution, telecom, industrial and OEM applications.
CNSPD is LEEYEE’s surge protection-focused brand platform, built to help global buyers source reliable SPDs and related low-voltage protection products.
Conçu pour protéger. Fiable pour durer.
Available B2B support
- AC, DC and signal SPD parameter confirmation
- Cabinet interface and DIN-rail space review
- Remote alarm contact configuration
- Datasheet and document-scope confirmation
- OEM label and private-label discussion
- Sample evaluation before bulk production
- Replaceable-module and spare-parts planning
FAQ sur les SPD pour cabinets de télécommunications extérieurs
What SPDs are normally required in an outdoor telecom cabinet?
A cabinet may require an AC input SPD, a 48V or −48V DC SPD, RJ45 or PoE protection, signal-line SPDs and remote alarm contacts. The exact combination depends on the conductive lines entering and leaving the cabinet.
Can one SPD protect the complete telecom cabinet?
Usually not. AC power, DC power, Ethernet, PoE and signal circuits have different operating voltages, interfaces and performance requirements.
Where should the AC SPD be installed?
It is commonly installed near the AC cable entry or within the AC distribution section before the rectifier and sensitive AC loads. The final location must follow the project design.
How should a −48V telecom SPD be selected?
Confirm the highest continuous voltage, polarity, bonded conductor, protection modes, discharge ratings, voltage protection level and grounding arrangement.
Can a PV DC SPD be used for a 48V telecom cabinet?
It should not be treated as a direct substitute. A high-voltage photovoltaic circuit and a low-voltage telecom DC bus have different system conditions.
Does every RJ45 SPD support PoE and Gigabit Ethernet?
No. Confirm the data rate, PoE arrangement, powered pairs, current, cable category, shielding and insertion-loss requirements.
Does an IP65 cabinet prevent internal condensation?
No. An IP classification addresses defined enclosure-ingress conditions. Internal condensation can still occur when temperature and humidity change.
Is remote alarm useful for an outdoor telecom cabinet SPD?
It is useful for remote and unattended cabinets. A potential-free contact can report a status change to an NMS, PLC, RTU or alarm controller.
Why should SPD grounding conductors be short?
Fast surge current can create additional voltage across the inductance of long conductors. Short, direct routing reduces unnecessary added voltage.
What should a cabinet OEM send before requesting a quote?
Send the electrical drawing, AC input, maximum DC voltage, grounding layout, Ethernet and PoE requirements, signal list, remote-alarm logic, mechanical space, environment, documents and quantity.
Normes et cadre de référence technique
- IEC 61643-11:2025 — Low-voltage surge protective devices connected to AC low-voltage power systems: requirements and test methods. IEC publication
- IEC 61643-41:2025 — Surge protective devices connected to DC low-voltage power systems: requirements and test methods. IEC publication
- IEC 61643-21:2025 — Surge protective devices connected to telecommunications and signalling networks: requirements and test methods, including networks carrying power on the same line such as Power over Ethernet. IEC publication
- IEC 61643-22:2015 — Selection and application principles for surge protective devices connected to telecommunications and signalling networks. IEC publication
- ITU-T K.56:2021 — Protection of radio base stations against lightning discharges. ITU-T recommendation
- ITU-T K.112:2021 — Lightning protection, earthing and bonding: practical procedures for radio base stations. ITU-T recommendation
- IEC 60529:1989+A1:1999+A2:2013 — Degrees of protection provided by enclosures, IP Code. IEC publication
- IEC 61643-12:2020 — Selection and application principles for SPDs connected to AC low-voltage power systems. IEC publication
- IEC 62305-4:2024 — Protection against lightning: electrical and electronic systems within structures. IEC publication
