RKS-G4028 Series


Product Features

  • Meets a wide range of demands from Fast Ethernet to full Gigabit industrial networks (up to 28 Gigabit ports)Modular interfaces for flexible connector type combinations
  • Support for IEEE 802.3bt PoE for up to 90 W output per port
  • High EMC immunity compliant with IEC 61850-3 and IEEE 1613
  • Hardware-based IEEE 1588 PTP for high-precision time synchronization
  • Turbo Ring and Turbo Chain (recovery time < 20 ms @ 250 switches) , and STP/RSTP/MSTP for network redundancy
  • -40 to 75°C operating temperature range
  • Supports MXstudio for easy, visualized industrial network management
  • Developed according to the IEC 62443-4-1 and compliant with the IEC 62443-4-2 industrial cybersecurity standards

The RKS-G4028 Series is designed to meet the rigorous demands of mission-critical applications for industry and business, such as power substation automation systems (IEC 61850-3, IEEE 1613), railway applications (EN 50121-4), and factory automation systems. The RKS-G4028 Series’ Gigabit and Fast Ethernet backbone, redundant ring, and 24 VDC, 48 VDC, or 110/220 VDC/VAC dual isolated redundant power supplies increase the reliability of your communications and save on wiring costs.

The modular design of the RKS-G4028 Series also makes network planning easy, and allows greater flexibility by letting you install up to 28 Gigabit ports with various connector types.


  • RKS-G4000 Series


Input/Output Interface
Alarm Contact Channels 1 relay output with current carrying capacity of 2 A @ 24 VDC
Ethernet Interface
10/100/1000BaseT(X) Ports (RJ45 connector) RKS-G4028-4GT models: 4
RKS-G4028-L3-4GT models: 4
100/1000BaseSFP Slots RKS-G4028-4GS models: 4
RKS-G4028-L3-4GS models: 4
RKS-G4028-PoE-4GS models: 4
RKS-G4028-L3-PoE-4GS models: 4
Module There are 3 module slots on the switch. Users can select different types of modules to insert into the switch. The modules that can be selected include 8-port/6-port modules with 10/100/1000BaseT(X), 10/100BaseT(X), 100/1000BaseSFP, or 100BaseFX (SC/ST connector) interfaces.

Refer to Expansion Modules in the Accessories section for a full list of supported interface modules.

Standards IEEE 802.1D-2004 for Spanning Tree Protocol
IEEE 802.1Q for VLAN Tagging
IEEE 802.1s for Multiple Spanning Tree Protocol
IEEE 802.1w for Rapid Spanning Tree Protocol
IEEE 802.1X for authentication
IEEE 802.3 for 10BaseT
IEEE 802.3ab for 1000BaseT(X)
IEEE 802.3ad for Port Trunk with LACP
IEEE 802.3u for 100BaseT(X) and 100BaseFX
IEEE 802.3x for flow control
IEEE 802.3z for 1000BaseSX/LX/LHX/ZX
IEEE 802.3bt for Power over Ethernet
Ethernet Software Features
Management IPv4/IPv6, Flow control, Back Pressure Flow Control, DHCP Server/Client, ARP, RARP,LLDP, Port Mirror, Linkup Delay, SMTP, SNMP Trap, SNMP Inform, SNMPv1/v2c/v3,RMON, TFTP, SFTP, HTTP, HTTPS, Telnet, Syslog, Private MIB
Filter GMRP, GVRP, GARP, 802.1Q, IGMP Snooping v1/v2/v3, IGMP Querier
Redundancy Protocols STP, RSTP, Turbo Ring v2, Turbo Chain, Ring Coupling, Dual-Homing, Link Aggregation, Loop Protection, MSTP
Routing Redundancy L3 models: VRRP
Security Broadcast storm protection, Rate Limit, Access control list, Static port lock, Sticky MAC, HTTPS/SSL, SSH, RADIUS, TACACS+, Login and password policy, Secure boot,MAC authentication bypass, Trust access control
Time Management SNTP, IEEE 1588v2 PTP (hardware-based), NTP Server/Client, NTP Authentication
Protocols IPv4/IPv6, TCP/IP, UDP, ICMP, ARP, RARP, TFTP, DNS, NTP Client, DHCP Server,DHCP Client, 802.1X, QoS, HTTPS, HTTP, Telnet, SMTP, SNMPv1/v2c/v3, RMON, Syslog
Unicast Routing L3 models: OSPF, Static Route
Power Substation MMS
Switch Properties
IGMP Groups 2048
Jumbo Frame Size 9.6 KB
MAC Table Size 16 K
Max. No. of VLANs 256
Packet Buffer Size 1.5 Mbits
Priority Queues 8
VLAN ID Range VID 1 to 4094
USB Interface
Storage Port USB Type A
MicroSD Interface
Storage Port MicroSD card
Serial Interface
Console Port RS-232 (RJ45)
Power Parameters
Total PoE Power Budget PoE models: 300 W
Max. PoE Power Output per Port PoE models:
IEEE 802.3af: 15.4 W
IEEE 802.3at: 30 W
IEEE 802.3bt: 90 W
Input Voltage RKS-G4028-LV models: 24/48 VDC
RKS-G4028-2LV models: 24/48 VDC (redundant dual inputs)
RKS-G4028-HV models: 110/220 VAC, 110/220 VDC
RKS-G4028-2HV models: 110/220 VAC, 110/220 VDC (redundant dual inputs)
PoE models: 48 VDC (for the PoE system)
Operating Voltage RKS-G4028-LV/2LV models: 18 to 72 VDC
RKS-G4028-HV/2HV models: 88 to 300 VDC, 85 to 264 VAC
PoE models: 46 to 57 VDC (for the PoE system)
Overload Current Protection Supported
Reverse Polarity Protection Supported
Input Current RKS-G4028-LV/2LV models:
Max. 2.53 A @ 24 VDC
Max. 1.25 A @ 48 VDC
RKS-G4028-HV/2HV models:
Max. 0.55 A @ 110 VDC
Max. 0.29 A @ 220 VDC
Max. 1.01 A @ 110 VAC
Max. 0.62 A @ 220 VAC
EPS (PoE models only):
Max. 7.50 A @ 48 VDC
Physical Characteristics
IP Rating IP30
Dimensions 440 x 44 x 300 mm (17.32 x 1.37 x 11.81 in)
Weight RKS-G4028-LV/HV models: 4900 g (10.80 lb)
RKS-G4028-2LV/2HV models: 5200 g (11.46 lb)
RKS-G4028-PoE-LV/HV models: 5000 g (11.02 lb)
RKS-G4028-PoE-2LV/2HV models: 5300 g (11.68 lb)
Installation Rack mounting
Environmental Limits
Operating Temperature -40 to 75°C (-40 to 167°F)
Storage Temperature (package included) -40 to 85°C (-40 to 185°F)
Ambient Relative Humidity 5 to 95% (non-condensing)
Standards and Certifications
Safety EN 62368-1, UL 62368-1, UL 61010
EMC EN 55032/35
EMI CISPR 32, FCC Part 15B Class A
EMS IEC 61000-4-2 ESD: Contact: 8 kV; Air: 15 kV
IEC 61000-4-3 RS: 80 MHz to 1 GHz: 35 V/m
IEC 61000-4-4 EFT: Power: 4 kV; Signal: 4 kV
IEC 61000-4-5 Surge: Power: 4 kV; Signal: 4 kV
IEC 61000-4-6 CS: 10 V
IEC 61000-4-8 PFMF
IEC 61000-4-11 DIPs
Power Substation IEC 61850-3, IEEE 1613
Railway EN 50121-4
Freefall IEC 60068-2-32
Shock IEC 60068-2-27
Vibration IEC 60068-2-6
Time RKS-G4028-4GT-HV models: 572,888 hours
RKS-G4028-4GT-2HV models: 518,894 hours
RKS-G4028-4GS-HV models: 529,925 hours
RKS-G4028-4GS-2HV models: 483,436 hours
RKS-G4028-4GT-LV models: 548,589 hours
RKS-G4028-4GT-2LV models: 479,574 hours
RKS-G4028-4GS-LV models: 508,639 hours
RKS-G4028-4GS-2LV models: 449,160 hours
RKS-G4028-PoE-4GS-HV models: 508,190 hours
RKS-G4028-PoE-4GS-2HV models: 465,282 hours
RKS-G4028-PoE-4GS-LV models: 488,598 hours
RKS-G4028-PoE-4GS-2LV models: 433,472 hours
Standards Telcordia (Bellcore), GB
Package Contents
Device 1 x RKS-G4028 Series switch
Installation Kit 2 x rack-mounting ear
4 x protective caps for unused SFP ports (for RKS-G4028-GS models only)
8 x round stickers for module screws

Ordering info

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