A router, VPN endpoint, and firewall device, the SEL-3620 Ethernet Security Gateway can perform secure and proxy user access for serial-and Ethernet-based IEDs. The SEL-3620 helps create a user audit trail through strong, centralized, user-based authentication and authorization to modern and legacy IEDs. The SEL-3620 secures your control system communications with a stateful deny-by-default firewall, strong cryptographic protocols, and logs for system awareness. The SEL-3620 also manages protected IED passwords, ensuring that passwords are changed regularly and conform to complexity rules. The SEL-3620 supports enhanced security, enabling you to protect critical cyberassets with strong multifactor authentication technologies, such as RSA SecurID using Remote Authentication Dial-In User Service (RADIUS). With four IPsec profiles available, including 2022 Secure, which contains updated cipher suites, the SEL-3620 offers best-in-class encryption and authentication of information packets.
The SEL-3620 resists known and unknown malware attacks with exe-GUARD embedded antivirus technology. Powerful rootkit resistance, embedded Linux mandatory access controls, and process allowlisting help mitigate attacks against the gateway itself and eliminate costly patch management and antivirus signature updates. The SEL-3620 supports NERC CIP compliance efforts without needing Technical Feasibility Exceptions (TFEs).
The SEL-3620 supports the SEL-5827 Virtual Connect Client and SEL-5828 Virtual Port Service Software. These applications are provided for free by SEL to make remote SEL-3620 ports available for existing software and terminal applications on your PC, including those using Modbus TCP/RTU.
The SEL-3620 was designed and built in cooperation with the U.S. Department of Energy National SCADA Test Bed and the following companies:
Centralized Access to Relays and IEDs—Provide a central point of entry to critical cyberassets with user-based access controls and detailed activity logs. Log onto the SEL-3620, not individual IEDs. Manage user accounts and group memberships centrally using Lightweight Directory Access Protocol (LDAP)-accessible systems, such as Microsoft Active Directory. RADIUS functionality enables the use of multifactor authentication systems, such as RSA tokens.
IED Password Management—Enforce strong passwords on IEDs, and change the passwords automatically on a configurable schedule. Satisfy regulatory password requirements, and ensure that no weak or default passwords are in use. Manage passwords on IEDs that use command-line interfaces and on devices that use the Modbus protocol, such as GE UR series relays. At the same time, simplify device access with device checkout and common persistent passwords.
Substation Firewall and IPsec VPN Endpoint—Secure your substation network from malicious traffic with a powerful deny-by-default firewall. Manage status and configuration with an intuitive, menu-driven interface. Securely connect critical networks to the control center using Internet Protocol Security (IPsec) VPNs. Use X.509 certificates with Online Certificate Status Protocol (OCSP) to centrally manage trust.
Accurate Time Synchronization—Synchronize timing information even if a GPS satellite signal is temporarily unavailable. Sync with local communications processors, computers, and security devices using IRIG-B for synchrophasor-accurate timing and Network Time Protocol (NTP) over Ethernet for granular logging and event timing.
Virtual Software Client Support—Transform unsecure serial or legacy Ethernet communications on Windows computers to cryptographically secure channels by using SEL-5827 or SEL-5828. These applications are provided for free by SEL to make remote Security Gateway ports available for existing software and terminal applications on your PC, including those using Modbus TCP/RTU. Data are secured using Secure Shell (SSH) with remote port groups, master ports, and serial ports.
Strong Auditability Supports NERC CIP Requirements—Log and time-stamp user access and all commands entered on critical IEDs. Integrate event records into existing log management systems using Syslog. Protect IEDs with strong passwords, and block shared or default accounts. Granular access controls limit users' access to their assigned roles on individual IEDs. Generate specific reports for user activity, user accounts on the device, network ports and services, IED password updates, and password updates.
Embedded Antivirus Algorithms—Resist known and unknown malware attacks against SEL Security Gateways with exe-GUARD embedded antivirus. Powerful rootkit resistance technology, embedded Linux mandatory access controls, and process allowlisting help mitigate attacks against the gateways themselves without additional settings or patch management requirements.
Secure Ethernet Communications—Use Media Access Control Security (MACsec) to enhance the existing cybersecurity of the SEL-651R and SEL-651RA recloser controls and reduce operation and maintenance expenses. MACsec secures Ethernet traffic (except IEC 61850 GOOSE and Parallel Redundancy Protocol [PRP] traffic) between an SEL-651R/651RA and SEL-3620 or Key Server MACsec-enabled routers/radios, providing confidential communication and maintaining message integrity between devices. Key management is automated via the MACsec Key Agreement (MKA) to simplify commissioning and improve the overall user experience.
Central Authentication—gain interactive access via a secured electronic access point (EAP) to the remote electronic security perimeter (ESP) using centralized credentials with SEL-3620 proxy services. Authorized users may access IEDs without needing to remember individual relay logins. Whether on the road, in the office, or on location at the substation, use existing terminal applications for command line configurations or acSELerator QuickSet SEL-5030 Software as a point-and-click graphical user interface (GUI) to make edits, view events, or check status information.
Lamp test button
Ethernet link status LEDs
Serial RX/TX LEDs
System status indication LEDs
Front Ethernet port
Rear Ethernet ports
IRIG-B input/output BNC ports
16 DB-9 EIA-232/-422/-485 software-selectable serial ports with IRIG-B and 5 V power on Pin 1
Isolated COM Port 17
Secured Proxy Access to Relays and IEDs
Use the SEL-3620 to provide a central point of entry to critical cyber assets, including those from SEL and others, with user-based access control and detailed activity logs.
IED Password Management
Enforce strong passwords on IEDs, and have them automatically changed on a configurable schedule. Satisfy regulatory password requirements, and ensure that no weak or default passwords are in use.
Secure your substation network from malicious traffic with a powerful deny-by-default firewall. Manage status and configuration with an intuitive, menu-driven web interface. Use virtual local-area networks (VLANs) to segregate traffic and improve network organization and performance.
Routing and NAT
Forward communications among separate Ethernet networks with static routes. The device supports Network Address Translation (NAT) for a wide variety of dynamic network applications. Port forwarding enables the use of a similar remote address space without redesigning IP subnets, and the outbound NAT supports Internet access for those applications that require it.
Integrate with existing IT and control systems over VPN tunnels that are secured using IPsec. Use X.509 certificates with OCSP to centrally manage VPN trust.
Exe-GUARD Allowlist Antivirus
Protect against known and unknown malware with embedded allowlist antivirus. Reduce patch cycles and resist zero-day attacks without additional settings.
Analog Bit-Based Protocol Conversion
Transform Conitel and other bit-based protocols to Ethernet, and reduce reliance on expensive analog circuits.
User Activity Reports
Log and time-stamp user access events and every command. Integrate event records into existing log management systems using Syslog.
Log on to the SEL-3620, not individual IEDs. Users have a single account and password to remember—their own. Manage user accounts and group memberships centrally using LDAP-accessible systems, such as Microsoft Active Directory, or use RADIUS. RADIUS allows you to enhance security with multifactor authentication, such as RSA SecurID.
Support NERC CIP Requirements
Implement strong user-based access controls to the ESP while protecting IEDs with strong passwords and blocking shared or default accounts. Granular access controls limit users' access to their assigned roles on individual IEDs.
Industry-Vetted Security and Interoperability
Virtual Software Client Support
Transform unsecured serial or legacy Ethernet communications on Windows computers to cryptographically secure channels by using SEL-5827 or SEL-5828. These applications are provided for free by SEL to make remote SEL-3620 ports available for existing software and terminal applications on your PC, including those using Modbus TCP/RTU. Data are secured using SSH with SEL-3620 port groups, master ports, and serial ports.
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The Firmware IDs for older versions of the firmware can typically be found in Appendix A of the instruction manual.