Allen-Bradley 1756-A4

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-A4

Type

Chassis

Application

ControlLogix chassis

Used with

1756 ControlLogix modules

Backplane current, chassis/slot max @ 1.2V DC

1.5 A/–

Backplane current, chassis/slot max @ 3.3V DC

4 A/4 A

Backplane current, chassis/slot max @ 5.1V DC

15 A/6 A

Backplane current, chassis/slot max @ 24V DC

2.8 A/2.8 A

Power dissipation, max

4 W

Isolation voltage

Determined by installed power supply and modules

Mounting method

Only horizontal

Cabinet size (HxWxD), min

50.8 x 50.8 x 20.3 cm (20 x 20 x 8 in.)

Weight, approx

0.75 kg (1.7 lb)

Location

Panel

Wire size

Functional earth ground - 8.3 mm2 (8 AWG) solid or stranded copper wire rated at 90 °C (194 °F) or greater, Protective earth ground - 2.1 mm2 (14 AWG) solid or stranded copper wire rated at 90 °C (194 °F) or greater

North American temperature code

T5 (Series B), T4 (Series C)

IEC temperature code

T4

Enclosure type rating

None (open-style)

Technical documents (1)

• Rockwell Automation technical data 1756-TD006

Key features

• 4 slot ControlLogix chassis
• Backplane 5.1V DC: 15 A chassis, 6 A per slot
• Maximum power dissipation of 4 W
• Panel location, horizontal mounting only
• Approximate weight of 0.75 kg (1.7 lb)

About the Allen-Bradley 1756-A4

The 1756-A4 is a 4 slot ControlLogix chassis (technical data 1756-TD006). Backplane current is 15 A per chassis and 6 A per slot at 5.1V DC, and 2.8 A per chassis and per slot at 24V DC. It dissipates up to 4 W and weighs approximately 0.75 kg (1.7 lb).

What is the 1756-A4 used for?

It holds a small ControlLogix system, such as a power supply, controller and two modules, in a panel, mounted horizontally only. Isolation voltage depends on the installed power supply and modules. The minimum cabinet size is 50.8 x 50.8 x 20.3 cm (20 x 20 x 8 in.), and it is open-style.

Lifecycle and successor

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

Before you order

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

Read the catalog number 1756-A4, 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.