Switch Components – Spare Parts and Accessories for Network Infrastructure
Network switch components are interchangeable modules – power supplies, fans, stacking kits – that help maintain network continuity, increase redundancy, and expand the capabilities of existing devices. If you manage IT infrastructure in a company and need a specific spare part or accessories for a switch, this guide will help you select the right component considering compatibility, technical parameters, and business application specifics.
In Senetic's offer, you will find AC and DC power supplies, fan modules, stacking kits, and components for switches from manufacturers such as MikroTik, HPE Aruba, Huawei, Netgear, Ubiquiti, and Fortinet.
Spare Parts and Accessories for Switches
Network switch components are Field Replaceable Units (FRU) – that is, field-replaceable parts – and accessories that extend the functionality of the switch. A switch connects devices in a local area network, operating at the second layer of the OSI model, and directs network traffic based on the MAC address table. Network switches are responsible for fast data transfer between ports, eliminating collisions and ensuring operation in full duplex mode. Managed switches offer advanced features such as VLAN (virtual local area network) and QoS, while unmanaged switches are ideal for small networks where extensive configuration is not required.
In switches used in large corporate networks and data centres, replaceable components play a key role. They allow for:
- Redundancy – dual power supplies (dual PSU) take over the load in case of failure of one unit
- Hot-swap – module replacement without interrupting device operation and network traffic
- Expansion – connecting multiple switches into one logical system using stacking modules
- Cooling adjustment – selecting fans compatible with the rack cabinet architecture
Replacing or expanding components is necessary in the event of a power supply failure, fan degradation, the need to increase PoE power for connected devices, or expanding the infrastructure with additional switches. The power supply provides energy for the operation of all switch components – its operation is therefore fundamental to the entire network.
Power Supplies for Switches – Redundancy and Network Continuity
Reliable power is the foundation of stable operation for any switch. In business environments – from offices to data centres – a power supply failure without redundancy means an immediate loss of connectivity for all connected devices. Redundant power supplies ensure network continuity in the event of a failure, so when choosing a switch for critical applications, consider the possibility of installing a second PSU.
AC and DC Power Supplies for Network Switches
- AC power supplies are widely used in offices and computer rooms.
- DC power supplies are typically used in telecommunications infrastructure and industrial installations, where direct current power is the standard.
In the offer of components for network switches, modules are available with power ratings of:
- 100 W, 150 W, 250 W – for smaller switches and routers
- 550 W, 600 W, 680 W – for mid-range switches, including models with Power over Ethernet support
- 1050 W and above – for enterprise devices supporting full PoE++ load for multiple ports
Hot-swap – Replacing Components Without Interrupting Network Operation
Hot-swap is the ability to remove and install a module while the device is operational – without interrupting data transmission and without a restart. This feature is crucial in large corporate networks, where even a brief network outage generates real business losses.
The safe replacement procedure requires:
- Ensuring that the second power supply (redundant) is operational and will take over the load
- Disconnecting the power cable from the module being replaced
- Removing the module and inserting the new one – the system should automatically recognise the new component
Fans and Cooling for Switches
Proper cooling is as important as power – overheating shortens the lifespan of components, causes thermal alarms, and can lead to device shutdown. ASIC – the processor responsible for fast filtering and forwarding of network traffic – generates significant amounts of heat, so an efficient fan system is essential. A faster processor increases the number of packets processed per second but also requires more intensive cooling.
Front-to-back and back-to-front Fans – What Do the Airflow Directions Mean?
The direction of airflow must match the architecture of the rack cabinet:
- Front-to-back (AIR OUT / AFO) – cold air enters from the front of the device (port side), hot air is expelled from the back. Used in configurations with a cold aisle in front of the cabinet.
- Back-to-front (AIR IN / AFI) – reverse airflow, used in alternative rack layouts.
Mixing airflow directions in one rack cabinet leads to the recirculation of hot air and overheating of equipment.
Stacking Modules – How to Connect Switches into One System
Stacking allows several physical switches to be connected into one logical system with a single management point, common configuration, and control redundancy. This solution is widely used in large networks where scalability and simplified management of network traffic are priorities.
Stack Kit – What Is It and When to Use It?
Stack kit is a set containing stacking adapters and cables (e.g., lengths of 50 cm, 1 m, or 3 m) necessary for physically connecting switches.
Technical limitations must be considered:
- Model compatibility – all switches in the stack must belong to the same product family and operate on a compatible firmware version
- Connection topology – stacking cables should form a closed ring; a break in the ring causes a drop in throughput
- Throughput – depends on the model
Not every network switch supports stacking – unmanaged switches and many basic models do not offer this feature. Smart switches combine features of unmanaged and managed switches, but stacking is mainly available in enterprise-class managed models.
How to Choose the Right Spare Parts for a Switch?
Selecting the right component requires precise verification of several parameters. An incorrectly chosen power supply or fan will not only fail to work – it may also damage the device or violate warranty conditions.
Spare Parts and Compatibility with the Original Switch
Key criteria for selecting components include:
- Part Number (PID) – each component has a unique manufacturer code
- Power type – AC or DC, considering input and output voltage
- Airflow direction – must be consistent with other modules in the device and the architecture of the rack
- Power – redundant power supplies should have identical power ratings to function correctly in failover mode
Original parts (OEM) guarantee full compatibility with firmware, safety and EMC certification, and preservation of the manufacturer's warranty. Replacements may be cheaper but carry the risk of insufficient power under PoE load, cooling issues, and loss of warranty support. RJ45 and SFP/SFP+ ports are used for connecting network cables, and the number and type of ports affect the maximum transmission speed – when selecting a power supply, it is worth considering the number of ports with active PoE.
Manufacturers of Components for Network Switches
In the category of components for switches, products from leading brands are available on the market:
- MikroTik – power supplies and enclosures for routers and switches
- HPE Aruba – enterprise power modules and components for business-class switches
- Huawei – components for telecommunications infrastructure and large corporate networks
- Netgear – accessories for M4300 series switches, designed for SMB and enterprise applications
- Ubiquiti – parts for the UniFi ecosystem, including power supplies and PoE modules
- Fortinet – components for FortiSwitch switches with FortiCare support options
FAQ – Frequently Asked Questions
What are switch components?
Network switch components are interchangeable modules and accessories that allow for the maintenance, repair, or expansion of a switch without the need to replace the entire device. The main categories include power supplies (AC and DC, including redundant), fans (with a specified airflow direction), stacking modules (adapters and cables), and enclosures for rack and desktop mounting.
What is the difference between a redundant power supply and a standard one in a switch?
A standard power supply is a single module powering the device – its failure means an immediate shutdown of the switch. A redundant power supply is a configuration with two or more PSU modules, where one operates in standby mode (N+1) or both share the load (N+N). In the event of one module's failure, the other takes over full power without interrupting network operation. Redundant power is essential in data centres, video surveillance systems, and anywhere network continuity is critical. In offices, switches enable the creation of efficient LANs, and dual power eliminates the risk of unavailability.
Can a fan in a switch be replaced without turning off the device?
Yes, provided that the switch supports the hot-swap feature for fan modules. The condition is to maintain a uniform airflow direction (modules front-to-back must not be mixed with back-to-front) and ensure free airflow in front of and behind the device.
What is a stack kit and does every switch support stacking?
A stack kit is a set consisting of stacking adapters and cables that allows for the connection of several physical switches into one logical system. Not every switch supports stacking – this feature is mainly available in enterprise-class managed switches. Unmanaged switches, which operate in plug and play mode, and simple SOHO class network devices do not offer stacking. Before purchasing a stack kit, check if the specific switch model supports this technology and what the maximum stack throughput is.
How can I check if a component is compatible with my switch?
The most effective method is to verify the part number (PID) of the component in the documentation of the switch manufacturer. Each power supply, fan, or stacking module has a specific PID assigned to certain device models. It is also important to check: power type (AC/DC), output power, voltage, airflow direction, and firmware version. If in doubt, the Senetic team will assist in identifying the correct component.
Can Cisco power supplies and fans be used in devices from other manufacturers?
No – components from individual manufacturers are designed for specific types of network switches and are not mutually compatible. Cisco power supplies have specific mechanical connectors, output voltages, and communication protocols with the device that do not fit HPE or Netgear switches. Using incompatible parts carries the risk of damaging the equipment, inadequate cooling, and loss of manufacturer warranty. Always select original components intended for the specific model and manufacturer of the switch.
