RKS-G4028-L3 Series

4 1GbE, 24 modular 1GbE-port (802.3bt PoE optional) Layer 3 modular managed Ethernet switches

Features and Benefits

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) If the port link speed is 1 Gigabit or higher, the recovery time is < 50 ms. , and STP/RSTP/MSTP for network redundancy
Supports MXstudio for easy, visualized industrial network management
IEC 62443-4-2 Security Level 2 certified
-40 to 75°C operating temperature range

Certifications

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Introduction

The RKS-G4028-L3 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-L3 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-L3 Series also makes network planning easy, and allows greater flexibility by letting you install up to 28 Gigabit ports with various connector types.

Additional Features and Benefits

Layer 3 switching functionality to move data and information across networks
IEEE 1588v2 PTP (Precision Time Protocol) for network time synchronization
Command line interface (CLI) for quickly configuring major managed functions
IGMP snooping and GMRP for filtering multicast traffic
Port-based VLAN, IEEE 802.1Q VLAN, and GVRP to ease network planning
QoS (IEEE 802.1p/1Q and TOS/DiffServ) to increase determinism
IEEE 802.3ad, LACP for optimum bandwidth utilization
Line-swap fast recovery

TACACS+, IEEE 802.1X, SNMPv3, HTTPS, and SSH to enhance network security
SNMPv1/v2c/v3 for different levels of network management
RMON for proactive and efficient network monitoring
Bandwidth management prevents unpredictable network status with “Lock port” to restrict access to authorized MAC addresses
Port mirroring for online debugging
Automatic warning by exception through email and relay output
Automatic recovery of connected device’s IP addresses
Configurable by web browser, Telnet/serial console, CLI, Windows utility, and ABC-02 or ABC-03 automatic backup configurator

IEC 62443-4-2 Security Level 2 Certified

RKS-G4028-L3 Series models are IEC 62443-4-2 Security Level 2 certified, enhancing cybersecurity in industrial networks.

L3 models: https://certificates.iecee.org/#/deliverables/CERT/1530510/view

All other models: https://certificates.iecee.org/#/deliverables/CERT/1530507/view

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Alarm Contact Channels

1 relay output with current carrying capacity of 2 A @ 24 VDC
Buttons

Reset button

10/100/1000BaseT(X) Ports (RJ45 connector)

RKS-G4028-L3-4GT models: 4
100/1000BaseSFP Slots

RKS-G4028-L3-4GS 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 802.1p for Class of Service
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

Management

ARP
Back Pressure Flow Control
DHCP Relay Agent (Option 82)
Fiber check
Flow control
HTTP
HTTPS
IPv4
Linkup Delay
LLDP
Port Mirroring (SPAN, RSPAN)
Private MIB
RARP
RMON
SFTP
SMTP
SNMP Inform
SNMP Trap
SNMPv1/v2c/v3
Syslog
Telnet
TFTP
Filter

GMRP
GVRP
GARP
802.1Q
IGMP Snooping v1/v2/v3
IGMP Querier
Redundancy Protocols

Link Aggregation
MRP
MRP Interconnection
MSTP
Multiple Dual Homing
Multiple Network Coupling
Network Loop Protection
Ring Coupling
RSTP
STP
Tracking
Turbo Chain
Turbo Ring v2
Routing Redundancy

VRRP
Security

Access control list
Broadcast storm protection
DHCP Snooping
Dynamic ARP Inspection
HTTPS/SSL
IEEE 802.1AE MAC security
IP Source Guard
Login and password policy
MAC authentication bypass
RADIUS
Rate Limit
Secure boot
SSH
Static port lock
Sticky MAC
TACACS+
Trust access control
Time Management

IEEE 1588v2 PTP (hardware-based)
NTP Authentication
NTP Server/Client
SNTP
Supported power profiles: IEEE 1588 Default 2008, IEC 61850-9-3-2016, IEEE C37.238-2017
Protocols

802.1X
ARP
DNS
HTTP
HTTPS
ICMP
IPv4
NTP Client
QoS
RARP
RMON
SMTP
SNMPv1/v2c/v3
Syslog
TCP/IP
Telnet
TFTP
UDP
VLAN Assignment
Industrial Protocols

EtherNet/IP
Modbus TCP
PROFINET
Unicast Routing

OSPF
Static Route
Multicast Routing

PIM-DM
PIM-SM
Multicast Local Route
MIB

IEEE8021-PAE-MIB
IEEE8021-SPANNING-TREE-MIB
IEEE8023-LAG-MIB
LLDP-EXT-DOT1-MIB
LLDP-EXT-DOT3-MIB
P-BRIDGE MIB
Q-BRIDGE MIB
RMON MIB Groups 1, 2, 3, 9
SNMPv2-MIB
Power Substation

1588 PTP Power Profile IEC 61850-9-3
1588 PTP Power Profile C37.238-2017

GOOSE Check
MMS

IGMP Groups

1024
Jumbo Frame Size

9.216 KB
MAC Table Size

16 K
Max. No. of VLANs

256
Packet Buffer Size

1.5 MB
Priority Queues

8
VLAN ID Range

VID 1 to 4094

Storage Port

USB Type A

Storage Port

microSD card

LED Indicators

PWR1, PWR2, STATE, FAULT, MSTR/HEAD, CPLR/TAIL, SYNC, EPS

Console Port

RS-232 (RJ45)

Total PoE Power Budget

300 W
Max. PoE Power Output per Port

IEEE 802.3af: 15.4 W
IEEE 802.3at: 30 W
IEEE 802.3bt: 90 W
Input Voltage

RKS-G4028-L3-LV models: 24/48 VDC
RKS-G4028-L3-2LV models: 24/48 VDC (redundant power supplies)
RKS-G4028-L3-HV models: 110/220 VAC, 110/220 VDC
RKS-G4028-L3-2HV models: 110/220 VAC, 110/220 VDC (redundant power supplies)
PoE models: 48 VDC (for the PoE system)
Operating Voltage

RKS-G4028-L3-LV/2LV models: 18 to 72 VDC
RKS-G4028-L3-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
Power Consumption (Max.)

RKS-G4028-L3-LV/2LV models:
Max. 60.72 W @ 24 VDC
Max. 60 W @ 48 VDC

RKS-G4028-HV/2HV models:
Max. 60.5 W @ 110 VDC
Max. 63.8 W @ 220 VDC
Max. 62.2 W @ 110 VAC
Max. 64.1 W @ 220 VAC

Note: These are the maximum power consumption ratings for the device with the maximum number of modules installed.

IP Rating

IP30
Dimensions

440 x 44 x 296 mm (17.32 x 1.37 x 11.65 in)
Weight

RKS-G4028-L3-LV/HV models: 4900 g (10.80 lb)
RKS-G4028-L3-2LV/2HV models: 5200 g (11.46 lb)
RKS-G4028-L3-PoE-LV/HV models: 5000 g (11.02 lb)
RKS-G4028-L3-PoE-2LV/2HV models: 5300 g (11.68 lb)
Installation

Rack mounting

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)

EMC

EN 55032/35
EN 61000-6-2/-6-4
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: 20 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 Voltage Dips & Interruptions
Cybersecurity

IEC 62443-4-2 Security Level 2
Safety

EN IEC 62368-1
IEC 60950-1
IEC 62368-1
UL 61010
UL 62368-1
Power Substation

IEC 61850-3
IEEE 1613
Railway

EN 50121-4
Traffic Control

NEMA TS2
Shock

IEC 60068-2-27
Vibration

IEC 60068-2-6
Freefall

IEC 60068-2-32

Time

RKS-G4028-L3-4GT-HV models: 572,888 hours
RKS-G4028-L3-4GT-2HV models: 518,894 hours
RKS-G4028-L3-4GS-HV models: 529,925 hours
RKS-G4028-L3-4GS-2HV models: 483,436 hours
RKS-G4028-L3-4GT-LV models: 548,589 hours
RKS-G4028-L3-4GT-2LV models: 479,574 hours
RKS-G4028-L3-4GS-LV models: 508,639 hours
RKS-G4028-L3-4GS-2LV models: 449,160 hours
RKS-G4028-L3-PoE-4GS-HV models: 508,190 hours
RKS-G4028-L3-PoE-4GS-2HV models: 465,282 hours
RKS-G4028-L3-PoE-4GS-LV models: 488,598 hours
RKS-G4028-L3-PoE-4GS-2LV models: 433,472 hours
Standards

Telcordia (Bellcore), GB

Warranty Period

5 years
Details

See www.moxa.com/warranty

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Support Documents

Name	Type	Version	Release Date
Datasheet for RKS-G4028-L3 Series 1.1 MB	Datasheet	v1.0	Aug 01, 2025 Aug 01, 2025

Available Models (12)

Show Images

	Compare RKS-G4028-L3-4GT-LV-T	Compare RKS-G4028-L3-4GS-2LV-T	Compare RKS-G4028-L3-PoE-4GS-2LV-T	Compare RKS-G4028-L3-PoE-4GS-HV-T
Max. No. of Ports	28	28	28	28
PoE Support	–	–	✓	✓
L3 Functionality	✓	✓	✓	✓
Input Voltage	24/48 VDC	24/48 VDC	24/48 VDC	110/220 VAC/VDC
Redundant Power Supplies	–	✓	✓	–
External Power Supply	–	–	✓	✓
Operating Temp.	-40 to 75°C	-40 to 75°C	-40 to 75°C	-40 to 75°C
	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag

	Compare RKS-G4028-L3-PoE-4GS-2HV-T	Compare RKS-G4028-L3-PoE-4GS-LV-T	Compare RKS-G4028-L3-4GT-2HV-T	Compare RKS-G4028-L3-4GT-2LV-T
Max. No. of Ports	28	28	28	28
PoE Support	✓	✓	–	–
L3 Functionality	✓	✓	✓	✓
Input Voltage	110/220 VAC/VDC	24/48 VDC	110/220 VAC/VDC	24/48 VDC
Redundant Power Supplies	✓	–	✓	✓
External Power Supply	✓	✓	–	–
Operating Temp.	-40 to 75°C	-40 to 75°C	-40 to 75°C	-40 to 75°C
	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag

	Compare RKS-G4028-L3-4GT-HV-T	Compare RKS-G4028-L3-4GS-2HV-T	Compare RKS-G4028-L3-4GS-LV-T	Compare RKS-G4028-L3-4GS-HV-T
Max. No. of Ports	28	28	28	28
PoE Support	–	–	–	–
L3 Functionality	✓	✓	✓	✓
Input Voltage	110/220 VAC/VDC	110/220 VAC/VDC	24/48 VDC	110/220 VAC/VDC
Redundant Power Supplies	–	✓	–	–
External Power Supply	–	–	–	–
Operating Temp.	-40 to 75°C	-40 to 75°C	-40 to 75°C	-40 to 75°C
	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag	Add to Quote View Bag