AB 1746-P4
AB 1746-P4
AB 1746-P4
AB 1746-P4
AB 1746-P4
AB 1746-P4
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  • Lifecycle status

    Lifecycle: Discontinued. Date: 2024-09-30. No planned Rockwell Automation replacement.

1746-P4

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Allen-Bradley 1746-P4 is a discontinued SLC 500 rack supply rated 10 A at 5 V DC with a 1 A isolated 24 V user output.
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Technical specifications for 1746-P4

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1746-P4
  • Product Family:
    SLC 500
  • Product Type:
    SLC 500 Rack-Mount AC Power Supply
  • Stock:
    1
  • Input voltage:
    85–132 V AC or 170–250 V AC, 47–63 Hz
  • Typical line power:
    150 VA
  • Maximum inrush current:
    45 A
  • Backplane current capacity:
    10.0 A at 5 V DC; 2.88 A at 24 V DC
  • Combined output limit:
    70 W across 5 V backplane, 24 V backplane and 24 V user source
  • User output:
    Isolated, non-fused 24 V DC; 1 A; 20.4–27.6 V DC
  • Fuse:
    Soldered in place
  • Operating temperature:
    0 to +60 °C, no derating
  • CPU hold-up time:
    20 ms at full load; 3000 ms at no load
  • Dimensions:
    11.0 × 14.0 × 14.5 cm
  • Weight:
    1.1 kg
  • Tariff Code:
    8504401990
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Chassis Loading User Power Power Recovery Application
  • Calculate the complete SLC 500 chassis load before selecting 1746-P4
  • Include the isolated 24 V user output in the shared 70 W output budget
  • Verify installed series and input-voltage wiring before replacement

1746-P4 is an Allen-Bradley SLC 500 rack-mount AC power supply.

It powers the SLC backplane and provides an isolated, non-fused 1 A, 24 V DC user output for suitable sensors and loads.

Confirm chassis loading, mains wiring, user-output demand and installed-series behavior because the product is discontinued without a planned direct replacement.

Availability, condition, price, and shipping time for 1746-P4 are confirmed during quotation.

Allen-Bradley 1746-P4 SLC 500 Power Supply Manuals, Datasheets, Links

Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

  • Total the 5 V and 24 V backplane current required by every module
  • Include the 24 V user source in the documented 70 W combined limit
  • Allow for future I/O additions without exceeding the power-supply curve
  • Use the isolated 24 V output only within its current and voltage limits
  • Provide appropriate time-delay protection on ungrounded conductors
  • Consider the documented Series A shutdown and CPU-fault behavior
  • Confirm the input range and line-frequency wiring before energizing
  • Account for load-dependent CPU hold-up during undervoltage events
  • Verify controller mode, program and outputs after a power interruption
  • SLC 500 chassis whose calculated 5 V DC backplane load remains within the 1746-P4 10.0 A capacity
  • Chassis designs whose 24 V DC backplane demand remains within 2.88 A and whose combined output stays within 70 W
  • Isolated 24 V DC user circuits within 1 A and the shared 1746-P4 total-output limit
Description
1746-P4 is an Allen-Bradley SLC 500 rack-mount power supply for 120/240 V AC installations.

It supplies the SLC backplane and provides an isolated, non-fused 24 V DC user output. The documented combination of 5 V backplane, 24 V backplane and user-output power must remain within the supply's total output limit.

Before replacement, verify chassis load, input-voltage wiring, user-output loading and the installed unit's series. Rockwell Automation marks 1746-P4 discontinued with no planned direct replacement.
Revisions

Revision Part #

Also known as

1746-P4 Ser A
1746-P4/A, Series A, Rev A
Alternative Names
1746-P4 1746 P4 Allen-Bradley 1746-P4 Allen Bradley 1746-P4 Rockwell Automation 1746-P4 SLC 500 1746-P4
Technical notes
1746-P4 is a discontinued SLC 500 rack-mount AC power supply with an isolated 1 A, 24 V DC user output. Rockwell Automation lists no planned direct replacement, so chassis load and installed-series behavior must be verified.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Can 1746-P4 replace an SLC 500 power supply solely because it fits the chassis?
No. Calculate the chassis 5 V and 24 V backplane load, user-output load and total wattage, then match the input-voltage wiring. Physical fit alone does not prove adequate capacity.
What happens if the 24 V user output is overloaded on a Series A 1746-P4?
The official instructions state that the power supply can shut down and the CPU can fault. Correct the overcurrent condition and reload the user program before returning the controller to service.
Can the internal fuse in 1746-P4 be replaced from the front panel?
No. The official specifications identify the fuse as soldered in place. A blown internal fuse requires qualified repair or power-supply replacement after the upstream fault or miswiring is corrected.
Why can an SLC 500 continue scanning briefly after input power drops?
The power supply provides a documented CPU hold-up interval that depends on loading. If the undervoltage lasts longer than that interval, the controller stops scanning and disables outputs until acceptable input voltage returns.
Can the 24 V user output replace a dedicated field power supply for every load?
No. It is limited by its current, voltage and the shared 70 W output budget. Check sensor inrush, grounding, isolation and the effect of a user-output fault on the controller before using it.
What must be checked when moving a 1746-P4 between 120 V and 240 V systems?
Follow the official terminal and jumper arrangement for the selected mains range, verify protective devices and grounding, and never energize the supply until the wiring agrees with the nameplate and installation instructions.
What is the migration path now that 1746-P4 is discontinued?
Rockwell Automation lists no planned direct replacement. Preserve the complete chassis load and application record, then evaluate a system-level SLC 500 migration or a qualified like-for-like spare rather than assuming another 1746 supply is interchangeable.

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