Allen-Bradley 1756-PB72

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-PB72

Type

Rack power supply

Application

ControlLogix chassis power

Used with

1756 ControlLogix chassis

Input voltage range

18…32V DC

Input voltage, nom

24V DC

Input power, max

95 W

Output power, max

75 W @ 0…60 °C (32…140 °F)

Inrush current, max

30 A

Hold up time

35 ms @ 18V DC 40 ms @ 24V DC 40 ms @ 32V DC

Current capacity @ 1.2V

1.5 A

Current capacity @ 3.3V

4 A

Current capacity @ 5.1V

10 A

Current capacity @ 24V

2.8 A

Isolation voltage

250V (continuous), Reinforced Insulation Type, Power Input to Backplane, Type tested @ 3500V DC for 60 s

Weight, approx

0.95 kg (2.10 lb)

Dimensions (HxWxD), approx

14.0 x 11.2 x 14.5 cm (5.51 x 4.41 x 5.71 in.)

Module location

Left side of 1756 chassis

Chassis compatibility

Series A, Series B, Series C

Wire size

2.5 mm2 (14 AWG) solid or stranded copper wire that is rated at 90 °C (194 °F), or greater, 1.2 mm (3/64 in.) insulation max

Wire category

1 - on power ports

Conductor screw torque

0.565 Nm (5 lbin)

North American temperature code

T4

Enclosure type rating

None (open-style)

Temperature, operating

0 °C < Ta < +60 °C (+32 °F < Ta < +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

Technical documents (1)

• Rockwell Automation technical data 1756-TD005

Key features

• Accepts 18…32V DC input, 24V DC nominal
• Delivers up to 75 W output at 0…60 °C
• Rated 10 A at 5.1V and 2.8 A at 24V
• Compatible with Series A, B and C chassis
• Open-style enclosure with T4 temperature code

About the Allen-Bradley 1756-PB72

The 1756-PB72 is a ControlLogix 24V DC power supply. Input is 18…32V DC, 24V DC nominal, and maximum output is 75 W at 0…60 °C. Current capacity is 1.5 A at 1.2V, 4 A at 3.3V, 10 A at 5.1V and 2.8 A at 24V. Hold up time is 40 ms at 24V DC, and it weighs approximately 0.95 kg.

What is the 1756-PB72 used for?

It powers a 1756 chassis from a 24V DC supply, fitted on the left side, and works with Series A, Series B and Series C chassis. Isolation between the power input and the backplane is 250V continuous.

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-PB72, 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.