1756-PA75

Product information

Product Overview

The 1756-PA75 is the standard ControlLogix AC power supply, converting 85–265 V AC line power (47–63 Hz) into the backplane rails that feed all 1756 modules. Official ratings: 5 V DC @ 13 A and 3.3 V DC @ 4 A. It mounts in the left-most bays of 1756 chassis (A4…A17) and requires no connection cables. The PA75 is the classic full-capacity supply for large chassis; the PA72 is the lower-current sibling and the PA75R the redundant variant.

Technical Specifications (Official Rockwell Data)

Product family	ControlLogix power supply (standard)
Input voltage	85–265 V AC
Input frequency	47–63 Hz
Backplane outputs	5 V DC @ 13 A; 3.3 V DC @ 4 A
Mounting	1756 chassis power-supply bays
Connection cables	None required
Product series	Series B
Lifecycle status (Rockwell)	Active

Lifecycle Status & Availability

Rockwell lists the 1756-PA75 as Active (Series B). It remains the standard AC supply for 1756 chassis. When sizing or auditing a chassis, sum each module’s backplane current draw (controllers, I/O, bridges) against the 13 A @ 5 V / 4 A @ 3.3 V budget — official per-module draws are published in Rockwell’s power-supply specifications document (1756-TD005).

Typical Applications

• New ControlLogix panels on 115/230 V AC distribution
• Replacement supply for chassis originally built with PA72 where headroom ran out
• Spares pools — power supplies are the classic single-point-of-failure item in any 1756 cabinet

Related & Compatible Models

Related supplies: 1756-PA72 (lower-current AC), 1756-PA75R (redundant pair), 1756-PB75/PB72 (DC-input equivalents), 1756-PA50 (slim). Chassis range: 1756-A4/A7/A10/A13/A17. If your audit shows a current-budget shortfall, consider moving to the PA75 or a redundant pair rather than upgrading the supply alone.

Requesting a Quotation

Send the catalog number with series letter, quantity, and your local line voltage (85–265 V AC covers most single-phase supplies, but state it anyway). If you are auditing an existing chassis, list the modules installed so the backplane budget can be checked in the quotation. Pricing and availability are confirmed individually.

Frequently Asked Questions

PA75 vs PA72 — which do I need?

The PA75 provides 13 A @ 5 V versus the PA72’s lower rating. Sum your modules’ backplane draws; if you are near the PA72 limit, the PA75 gives headroom. Official per-module draw tables are in Rockwell’s 1756-TD005 document.

Is it redundant?

The plain PA75 is a single supply. Redundancy uses the 1756-PA75R in a paired configuration — different catalog number, so specify which your chassis requires.

Does it need a cable?

No — official data lists no connection cables required; it mounts directly in the chassis supply bay.

Can it run on 230 V AC?

Yes — input range is 85–265 V AC at 47–63 Hz, covering standard single-phase distribution worldwide.