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The company also released a new version of the software that runs the devices.
NetScreen added two devices each to its large enterprise and small-to-medium-sized business product lines with the announcement.
All four devices feature firewalls that offer security features such as Network Address Translation (NAT) and protection against port scans and dozens of common Web attacks.
The appliances also offer VPN support compliant with the IPSecurity (IPSec) standard, the company said. A VPN allows users to send data over the Internet as if it were a part of a corporate network.
The higher-end of the two enterprise-class devices, the NetScreen-208, offers eight auto-sensing 10/100 Ethernet ports and up to 550Mbps of firewall throughput and 200Mbps of VPN throughput, according to NetScreen.
The NetScreen-204 offers four 10/100 Ethernet ports and delivers throughput of up to 400Mbps on the firewall and 200Mbps on VPN. NetScreen also said that both devices could support up to 1,000 VPN connections, or "tunnels."
NetScreen has issued a European wide price list in dollars which is around 25% higher than its US recommended prices. The European price for the NetScreen-208 is $19,500 (£13,533) and the 204 will cost $13,000 (£9,022).
The company also introduced two devices for small-to-medium-sized businesses: the NetScreen-50 and 25. Both devices sport four auto-sensing 10/100 Ethernet ports.
While the $7,795 NetScreen-50 offers 170Mbps of firewall throughput and 50Mbps to the VPN, the $4,500 NetScreen-25 supports up to 100Mbps throughput for the firewall and 20Mbps for the VPN, NetScreen claimed.
Lastly, NetScreen also beefed up its ScreenOS, the software that runs its devices. The new version allows administrators to create and manage security "zones" within a network, activate appliance features for each port on a device individually and more finely control security features.
All four devices will be available from 14 January, though only the 204 and 208 are shipping with ScreenOS 3.1. NetScreen said that ScreenOS support for the 25 and 50 models - as well as support for NetScreen's 100, 5XP and 500-series models - will come in the first half of 2002.