Allen-Bradley 1783-BMS20CGP

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1783-BMS20CGP

Type

Industrial Ethernet switch

Application

Industrial Ethernet network

Used with

EtherNet/IP networks

Alarm relay

1 A @ 30V DC or 0.5 A @ 48V DC

Power input

0.5…3.0 A max @ 12…48V DC, Class 2/SELV

Power

21 W @ 24V DC/40 °C (104 °F) 30 W max

Power dissipation

30 W

Isolation voltage

50V (continuous), basic insulation type, DC power ports to ground, DC power ports to Ethernet ports, and DC power ports to alarm ports, No isolation between individual Ethernet ports, No isolation between console port and system, Type tested at 850V DC for 60 s

Wire size

RJ45 connector according to IEC 60603-7, 2- or 4-pair Category 5e minimum cable according to, TIA 568-B.1 or Category 5 cable according to ISO/IEC 24702

Wire size, DC

0.5…0.8 mm2 (20…18 AWG) solid or stranded copper wire rated at 75 °C (167 °F) or greater, 1.2 mm (3/64 in.) insulation max, 6.3 mm (0.25 in.) ±0.5 mm (0.02 in.) strip length

Wire size, alarm

0.5…0.8 mm2 (20…18 AWG) solid or stranded, UL/CSA-rated style 1007 or 1569 twisted-pair copper appliance wiring material (AWM) wire, 6.3 mm (0.25 in.) ±0.5 mm (0.02 in.) strip length

Wire size, ground

4.0 mm2 (12 AWG) min, stranded copper wire

Screw torque

0.23 Nm (2.0 inlb)

Weight, approx

2.04 kg (4.50 lb)

Wiring category

3 - on console and alarm ports 2 - on DC power ports 2 - on Ethernet ports

Enclosure type

None (open-style)

Pilot duty rating

Alarm not rated

North American

T4

Industry

Substation KEMA (IEEE 1613, IEC 61850 - 3), IEEE 1613 Electric Power Stations Communications Networking, IEC 61850-3 Electric Substations Communications Networking

Temperature, operating

-40…+60 °C (-40…+140 °F)

Temperature, surrounding air, max

60 °C (140 °F)

Temperature, nonoperating

-40…+85 °C (-40…+185 °F)

Relative humidity

5…95% noncondensing

Vibration

2 g @ 10…500 Hz

Shock, operating

30 g

Shock, nonoperating

55 g

Emissions

Class A

ESD immunity

8 kV contact discharges 15 kV air discharges

Technical documents (1)

• Rockwell Automation technical data 1783-TD002

Key features

• Operating temperature range of -40 to +60 °C
• Power input of 12 to 48V DC, Class 2/SELV
• Alarm relay rated 1 A at 30V DC
• Substation ratings to IEEE 1613 and IEC 61850-3
• Open-style enclosure with IP30 environmental rating

About the Allen-Bradley 1783-BMS20CGP

The 1783-BMS20CGP is a Stratix 5700 20 port managed switch, now discontinued. Power input is 0.5 to 3.0 A max at 12 to 48V DC, Class 2/SELV, with power of 21 W at 24V DC and 40 °C and 30 W max. It works from -40 to +60 °C, is rated IP30 in an open-style housing, and weighs approximately 2.04 kg. The 1783-CMS20DP is named by the maker as the successor (Engineering Replacement).

What is the 1783-BMS20CGP used for?

It connects devices on a managed industrial Ethernet network, over RJ45 ports with Category 5e minimum cable. An alarm relay rated 1 A at 30V DC or 0.5 A at 48V DC signals faults. It meets the substation standards IEEE 1613 and IEC 61850-3.

Lifecycle and successor

Discontinued (Rockwell Automation lifecycle status, checked 24 October 2026).

OEM successor: 1783-CMS20DP

Before you order

What to photograph or confirm so the right unit is quoted.

Read the catalog number 1783-BMS20CGP, the series letter and the firmware revision from the label. Send us a photo of the label and we confirm the match before we quote.