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Allen-Bradley 1746-P4 AC power supply module

Allen-Bradley 1746-P4
Allen-Bradley 1746-P4
Allen-Bradley 1746-P4

Allen-Bradley 1746-P4 AC power supply module

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ALLEN-BRADLEY / SLC 500
1746-P4
 
Rack-Mounting Power Supply
For SLC 500 modular hardware systems
 
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01 / INPUT
85–132 / 170–250 V AC
Selectable AC line-voltage ranges
02 / OUTPUT CAPACITY
10 A / 5 V DC
2.88 A / 24 V DC
Rated backplane output capacities
03 / LINE FREQUENCY
47–63 Hz
Maximum inrush current: 45 A
Combined output power limit: 70 W
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ALLEN-BRADLEY · 1746-P4 PRODUCT SYSTEM FIT SUPPLY FAQ MODELS
 
 
 
P4
 
 
SLC 500 Chassis Power

ALLEN-BRADLEY
1746-P4

 

A high-capacity rack-mounted AC power supply for the SLC 500 modular chassis, delivering regulated backplane power to the processor, communication modules and I/O slots.
POWER IDENTITY
120/240 V AC
5 V Backplane 10 A
24 V Backplane 2.88 A
24 V User Output 1 A
01 · POWER PROFILE

Capacity Before Appearance

◉
Chassis Role

The 1746-P4 mounts at the left side of an SLC 500 modular chassis and connects directly to the chassis power connector. It supplies the backplane rather than occupying an I/O slot.
⌁
Load Calculation

The 5 V and 24 V backplane demands of the processor, adapters and every installed module must be totaled. The optional 24 V user load must also be included in the overall supply limit.
△
Lifecycle Context

The product is discontinued, with no planned direct Rockwell Automation replacement. Existing-system purchases require careful identity, condition and chassis-load verification.
 

Electrical Envelope

PARAMETER 1746-P4 VALUE ORDERING IMPACT
Input range 85–132 V AC or 170–250 V AC, 47–63 Hz Confirm the voltage-selector jumper before energizing.
Backplane, 5 V DC 10 A maximum Total the 5 V current of the processor and every chassis module.
Backplane, 24 V DC 2.88 A maximum Check modules drawing power from the 24 V backplane rail.
User output 1 A at 24 V DC; 20.4–27.6 V DC Include external user load in the common 70 W output ceiling.
Total output power 70 W maximum 5 V backplane, 24 V backplane and user output are not independent maxima.
Maximum inrush 45 A Size upstream protection and switching components appropriately.
Operating temperature 0–60 °C The P4 does not require the above-55 °C current derating applied to several other 1746 supplies.
Need a verified 1746-P4 for an existing SLC 500 rack?
Send the chassis catalog number, installed module list, input voltage and required condition for a focused quotation.
 ASK MIYA FOR A QUOTE
02 · ENGINEERING CHECK

Power Budget Is the Real Compatibility Test

Backplane demand

Add the 5 V DC and 24 V DC current requirements for the processor, communication adapter and each I/O or specialty module installed in the chassis.

Common 70 W ceiling

The rated rail currents cannot all be used at their individual maxima simultaneously. Combined 5 V, 24 V backplane and 24 V user power must remain within 70 W.

Future additions

Reserve practical capacity for approved future modules rather than sizing only for the present rack. Recalculate whenever a module is added or exchanged.
 
BUDGET EQUATION
(5 V × I5V) + (24 V × I24V) + User Load ≤ 70 W
Rail current limits must also be respected individually. A passing wattage total does not override the 10 A, 2.88 A or 1 A current limits.
03 · SYSTEM RELATIONSHIP

Where 1746-P4 Fits in the SLC 500 Rack

POSITION 01
1746 Chassis

The supply attaches to the chassis power connector at the left side. It is selected per chassis, including remotely connected chassis.

 ›
POSITION 02
Processor / Adapter

An SLC processor or compatible communication adapter supervises the rack and contributes to its power demand.

 ›
POSITION 03
1746 Modules

Discrete, analog, communication and specialty modules draw different amounts from the 5 V and 24 V rails.

 ›
RESULT
Verified Budget

The selected supply must satisfy both rail-current limits and the combined output-power limit with operating margin.

Power-Supply Relationship

MODEL INPUT 5 V / 24 V BACKPLANE SELECTION POSITION
1746-P1 AC 2 A / 0.46 A Light backplane demand
1746-P2 AC 5 A / 0.96 A Medium AC-powered rack
1746-P4 AC 10 A / 2.88 A Highest-capacity AC supply in this comparison
1746-P3 24 V DC 3.6 A / 0.87 A DC-fed system
1746-P7 12/24 V DC Input-dependent capacity Isolated low-voltage DC input

These supplies are not selected by physical similarity alone. Incoming supply, rail loading, user-power demand, system approval and wiring must all be checked.

 
 
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Our purpose is to deliver high-quality industrial automation parts quickly and reliably, helping customers reduce downtime and restore operations.
Quality and Reliability
Careful product matching, responsive support and transparent communication help customers plan maintenance and replacement work with confidence.
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New and discontinued automation parts are procured for diverse industries through a broad international cooperation network.
QUALITY
Careful component matching		 RELIABILITY
Responsive delivery planning		 TRUST
Clear, honest communication		 SUPPORT
Help for unique requirements
DIRECT CONTACT

Discuss the Rack Before You Order

◎
SALES MANAGER
Miya Zheng
✉
sales@amikon.cn
Email the module list and required condition
◉
WhatsApp: 86-18020776792
Quick support for identification and availability
BUYER-FOCUSED FAQ

Five Checks That Protect the Purchase

01
How should a buyer confirm that 1746-P4 has enough capacity for the existing rack?
Add the 5 V and 24 V backplane current of the processor and every installed module, then include any 24 V user-output load. The result must respect the 10 A and 2.88 A rail limits, the 1 A user limit and the combined 70 W ceiling.
02
Can 1746-P4 be energized from either 120 V AC or 240 V AC without checking anything else?
No. Incoming power must be isolated and the voltage-selection jumper must match the applied range before wiring and energization. The protective ground and supply terminals must also be connected correctly.
03
Is 1746-P4 a direct replacement for any lower-capacity 1746 AC supply?
Not by catalog-family similarity alone. Verify chassis type, input wiring, selector-jumper setting, physical installation, approvals, system load and the external use of the 24 V output before treating the exchange as suitable.
04
What condition details matter most when buying a discontinued 1746-P4?
Request clear catalog and series markings, terminal and jumper condition, housing condition, manufacturing identification and the seller's stated test status. Match the complete identity to the installed unit before shutdown work is scheduled.
05
Does Rockwell Automation name a direct replacement for discontinued 1746-P4?
No planned direct replacement is stated for this product. Migration or redesign decisions must be based on the complete SLC 500 architecture, I/O functions, communications, software and validated machine requirements.
Returns & Replacement Contact us within seven days if an issue is found after receipt. Provide the order details and a clear reason so the case can be reviewed promptly. Returned items must remain in their original condition. A return or replacement is processed after the returned unit is received and checked. Shipping costs generated by the return are the buyer's responsibility.
INDUSTRIAL INVENTORY

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