Replacement for SA520-GW25-BUN3-K9: Drop-In Alternatives We Stock
Looking for a replacement for the SA520-GW25-BUN3-K9 (SA520-GW25-BUN3-K9 - Cisco SA 520 Firewall 6 Port 25 User Firewall Throughput: 200Mbps VPN Throughput: 65Mbps 4 x 10/100/1000Base-T Network LAN, 1 x 10/100/1000Base-T Network WAN, 1 x 10/100/1000Base-T Network WAN, LAN & DMZ)? Pro Disk Network ships Cisco drop-in replacements and equivalent modern parts from US inventory. Every alternate below is in-stock today with same-day shipping for orders placed before 2pm ET. If your unit is still under warranty, contact our engineering team — we offer cross-shipping for B2B customers on Net 30 terms.
About the SA520-GW25-BUN3-K9
| SKU | SA520-GW25-BUN3-K9 |
|---|---|
| Product | SA520-GW25-BUN3-K9 - Cisco SA 520 Firewall 6 Port 25 User Firewall Throughput: 200Mbps VPN Throughput: 65Mbps 4 x 10/100/1000Base-T Network LAN, 1 x 10/100/1000Base-T Network WAN, 1 x 10/100/1000Base-T Network WAN, LAN & DMZ |
| Stock status | In Stock |
| Detail page | View SA520-GW25-BUN3-K9 › |
Drop-in replacements for SA520-GW25-BUN3-K9
Each part below is currently in our US warehouse, ships same-day for orders before 2pm ET, and includes our 90-day warranty. SKUs link to the full product page with photos, datasheets and B2B quote form.
ASA5525-K9 - Cisco 8-Port 120/230V 1000Base-T Gigabit Ethernet Firewall Edition Security Appliance Rack-Mountable
SKU: ASA5525-K9
Price: $15,924.63
73-12522-04 - Cisco UCS P81e Dual-Port 10Gb SFP PCIe Virtual Interface Card
SKU: 73-12522-04
Price: $131.72
AIR-WLC2125-K9 - Cisco Aironet 2125 8-Port 10/100Base-TX Wireless LAN Controller
SKU: AIR-WLC2125-K9
Price: $276.32
GLC-SX-MMD - Cisco 1.25Gb/s 1000Base-SX Multi-Mode Fiber 550m 850nm Duplex LC Connector SFP Transceiver Module
SKU: GLC-SX-MMD
Price: $10.53
DWDMGBIC3661 - Cisco 1.25Gbps 1000Base-DWDM Single-Mode Fiber 80km 1536.61nm Duplex SC Connector GBIC Transceiver Module
SKU: DWDMGBIC3661
Price: $31.47
DWDMGBIC5655 - Cisco 1.25Gbps 1000Base-DWDM Single-mode Fiber 80km 1556.55nm Duplex SC Connector GBIC Transceiver Module
SKU: DWDMGBIC5655
Price: $38.74
DWDM-GBIC-58.17 - Cisco 1.25Gbps 1000Base-DWDM Single-mode Fiber 80km 1558.17nm Duplex SC Connector GBIC Transceiver Module
SKU: DWDM-GBIC-58.17
Price: $38.74
30-1301-03 - Cisco 1.25Gb/s 1000Base-SX Multi-Mode Fiber 550m 850nm Duplex LC Connector SFP Transceiver Module
SKU: 30-1301-03
Price: $62.17
WS-G5483-C - Cisco 1.25Gb/s 1000Base-T Copper 100m RJ-45 Connector GBIC Transceiver Module
SKU: WS-G5483-C
Price: $78.00
Cisco GLC-SX-MM=-RF 1.25Gbps 1000Base-SX Multi-mode Fiber 550m 850nm Duplex LC Connector SFP Transceiver Module
SKU: GLC-SX-MM--RF
Price: $78.00
How we pick replacements
Every recommendation above was selected using these criteria:
- Drop-in compatibility — same form factor (2.5"/3.5", PCIe slot, SFP port, etc.), so it fits the original chassis without modification
- Equivalent or better performance — matched on RPM/IOPS/speed/throughput, never downgraded
- Same-brand-preferred — we list the OEM-equivalent first when available, then trusted aftermarket
- Warranty coverage — 90-day Pro Disk warranty on every part, with 1-year option for B2B
- In stock today — never recommend a part that is on backorder
Need help confirming compatibility?
Our engineers validate every replacement against your specific server, switch, or chassis model before shipment. Email sales@prodisknetwork.com with your platform model (e.g., Dell PowerEdge R740, HP DL380 Gen10, Cisco Catalyst 9300) and we will confirm the exact part number that drops into your hardware.