Un armadio telecom all'aperto richiede normalmente più di un SPD. Proteggi ciascuna linea conduttiva AC, DC, Ethernet e di segnale in base alla sua tensione reale, interfaccia, posizione di installazione e disposizione di messa a terra.
Indice dei contenuti
Quale protezione da sovratensioni è necessaria per un armadio telecom all'aperto?
Iniziare identificando ogni cavo conduttivo che entra o esce dall'armadietto. Non iniziare selezionando uno SPD generico.
L'alimentazione AC, l'alimentazione DC a bassa tensione e i circuiti delle telecomunicazioni o di segnalazione sono coperti da requisiti e framework di test SPD diversi. [1] [2] [3]
Ingresso AC
Protegge l'alimentazione di rete, la distribuzione AC e l'ingresso del raddrizzatore.
DC 48V / −48V
Protegge l'uscita del raddrizzatore, il bus della batteria e la distribuzione CC.
Ethernet
Protegge le linee dati in rame supportando la velocità richiesta e l'arrangiamento PoE.
RS485 e sensori
Protegge i circuiti di monitoraggio, allarme, controllo e sensori ambientali. .
Allerta remota
Riporta un cambiamento di stato dell'SPD al sistema di monitoraggio del cabinet.
Architettura di protezione da sovratensioni per armadi telecom all'aperto
Esaminare ogni linea conduttiva che attraversa il confine del cabinet. Posizionare l'SPD pertinente vicino all'ingresso del cavo o al punto di distribuzione.
Gli SPD, l'involucro del cabinet e le relative schermature dei cavi devono essere integrati nel progetto di messa a terra e di collegamento. [5] [6]
Matrice di selezione SPD per armadi telecom all'aperto
Definire il circuito protetto prima di confrontare i modelli dei fornitori. Prodotti che si adattano alla stessa guida DIN possono comunque servire applicazioni completamente diverse.
| Interfaccia del cabinet | Categoria SPD tipica | Attrezzature protette | Parametri da confermare | Errore comune di acquisto |
|---|---|---|---|---|
| Ingresso dell'utilità AC | SPD AC di tipo 1+2 o tipo 2 secondo il design del progetto | Distribuzione AC, raddrizzatore, ventilatore, riscaldatore e carichi ausiliari AC | Tensione, fasi, sistema di messa a terra, Uc, Iimp dove richiesto, In, Imax, Up, poli e protezione di riserva | Selezionando solo dalla tensione nominale AC |
| 48V / −48V bus DC | SPD DC a bassa tensione adatta per l'attuale sistema DC delle telecomunicazioni | Uscita del raddrizzatore, bus della batteria, distribuzione DC e carichi delle telecomunicazioni | Massima tensione continua, polarità, conduttore collegato, Uc, valutazioni di scarica, Up e disposizione dei poli | Selezionando solo dalla descrizione nominale “48V” |
| RJ45 Ethernet | RJ45 data-line SPD | Switch Ethernet, router, gateway, telecamera, radio e controller | Velocità dei dati, categoria del cavo, schermatura, coppie protette, disposizione del connettore e perdita di inserzione | Assumendo che ogni SPD RJ45 supporti Gigabit Ethernet |
| Linea PoE | SPD RJ45 compatibile con la configurazione PoE richiesta | Telecamera da esterno, punto di accesso wireless e dispositivo alimentato da PoE | Metodo PoE, potenza, coppie alimentate, corrente, velocità e schermatura | Assumendo che ogni SPD dati supporti la potenza PoE richiesta |
| RS485, sensore o allarme | SPD della linea di segnale abbinata all'interfaccia | RTU, controller, sensore, allarme porta e I/O remoto | Tensione di segnale, corrente, conteggio delle coppie, protocollo, tasso di trasmissione , schermatura e terminali | Sostituire un SPD di segnale con un SPD di alimentazione DC |
| Uscita di stato SPD | SPD con contatto remoto senza potenziale | NMS, PLC, RTU o controller di allarme dell'armadio riceve il segnale | Logica COM, NO e NC, valutazione del contatto e stato normale/guasto | Ordinare una versione standard senza segnalazione remota |
Selezione SPD per ingresso AC
L'SPD AC protegge l'alimentazione elettrica in ingresso e il lato AC del rettificatore. La selezione e il coordinamento dovrebbero seguire il sistema AC reale, la posizione di installazione e il concetto di protezione del progetto. [1] [8]
Selezione SPD per 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.
Protezione da sovratensioni per RJ45 e 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 e il PoE surge protection guide .
Protezione da sovratensioni per RS485, sensori e linee di monitoraggio
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.
Contatto di allarme remoto per stato 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 messa a terra e il collegamento influenzano la protezione ottenuta
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 e SPD grounding requirements .
Classificazione IP e condensazione sono questioni diverse
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
Famiglie di prodotti LEEYEE tipiche per armadi telecom
This mapping helps buyers identify the likely product family. It is not a universal model-substitution table.
Cosa devono verificare gli acquirenti oltre il datasheet
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.
Approvazione del campione
Verify terminal arrangement, DIN-rail space, remote contact, labels and replacement modules before bulk production.
Manutenzione SPD e sostituzione moduli
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.
Informazioni da inviare prima di richiedere un preventivo
These details allow the supplier to compare the same engineering requirement and reduce model-selection errors.
Hai bisogno di una raccomandazione iniziale per SPD?
Send the cabinet drawing, AC input, highest continuous DC voltage, RJ45 or PoE requirements, signal-line list, grounding layout and expected quantity.
Supporto per la fornitura OEM di armadi telecom e progetti
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.
Costruiti per Proteggere. Affidabili nel Tempo.
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 SPD per armadi telecom all'aperto
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.
Normative e quadro di riferimento tecnico
- 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
