The Allen-Bradley 1756-PA75 is a ControlLogix AC power supply that mounts directly onto the left end of a 1756 chassis. It accepts a wide input voltage range of 85–265V AC and provides multiple DC output rails to power the chassis backplane and all installed modules, including processors, communication modules, and I/O cards.
Item No :
1756-PA75Order(MOQ) :
1 PiecePayment :
EXWProduct Origin :
MexicoShipping Port :
WuhanLead Time :
3~5 daysWeight :
5kg| Specification | Description |
|---|---|
| Manufacturer | Rockwell Automation (Allen-Bradley) |
| Model | 1756-PA75 |
| Product Family | ControlLogix |
| Product Type | AC Input Backplane Power Supply |
| Input Voltage | 85–265V AC (auto-sensing), 47–63 Hz |
| Power Output | 75 W |
| Output Voltage (5V DC) | 13 A |
| Output Voltage (3.3V DC) | 4 A |
| Output Voltage (1.2V DC) | 1.5 A |
| Output Voltage (24V DC) | 1.75 A |
| Mounting | Left end of 1756 chassis (chassis mount) |
| Operating Temperature | 0°C to +60°C (32°F to 140°F) |
| Storage Temperature | -40°C to +85°C |
| Status Indicators | Front-panel status LEDs |
| Certifications | UL, cUL, CE, ATEX Zone 2 (when used with certified backplanes) |
| Weight | Approx. 1.46 kg (3.22 lbs) |
| Lifecycle Status | Active / Mature |
| Model | Description | Typical Application |
|---|---|---|
| 1756-PA75R | Redundant AC power supply version (requires 1756-PSCA2 adapter and 1756-CPR2 cable) | Critical applications requiring power supply redundancy |
| 1756-PB75 | DC input version (24V DC input) | DC-powered control systems |
| 1756-PA75K | Conformal-coated version for harsh environments | Corrosive or humid industrial environments |
| 1756-PAXTR | Redundant XT version for extreme temperatures (-25°C to +70°C) | Extreme environment applications |
| 1756-PA72 | 120/220V AC power supply (earlier version, 13A at 5V DC) | Legacy ControlLogix systems |
| 1756-PSCA2 | Chassis adapter for redundant power supply configurations | Required for redundant power setups |
Q1: What is the primary function of the 1756-PA75?
It is a backplane power supply that mounts on the left end of a ControlLogix 1756 chassis. It converts AC input power to regulated DC voltages (5V, 3.3V, 1.2V, and 24V) and distributes them through the chassis backplane to power all installed modules, including processors, communication cards, and I/O modules .
Q2: What input voltage does the 1756-PA75 accept?
The power supply accepts 85–265V AC at 47–63 Hz. The voltage input is auto-sensing, meaning no jumper or manual voltage selection is required — simply connect the AC line power and the supply will automatically adjust .
Q3: What are the output current capacities of this power supply?
The 1756-PA75 provides:
5V DC: 13 A
3.3V DC: 4 A
1.2V DC: 1.5 A
24V DC: 1.75 A (for field devices)
Q4: What should I check if the power supply fails to start or trips intermittently?
Common causes include:
Blown upstream fuse — ensure a 15A time-delay fuse is installed on ungrounded power connections
Overcurrent protection triggered — check for shorted I/O modules or backplane faults
Aging electrolytic capacitors — if the unit is over 10 years old, capacitor degradation can cause intermittent trips
Toggle switch operation — the front toggle switch is a hard power switch, not a reset button; cycling it performs a full power-on self-test
Q5: What is the difference between the 1756-PA75 and 1756-PA75R?
The 1756-PA75 is the standard (non-redundant) power supply. The 1756-PA75R is the redundant version designed for critical applications. A redundant system requires two 1756-PA75R power supplies, a 1756-PSCA2 chassis adapter, and 1756-CPR2 cables. If one supply fails, the remaining supply accommodates the entire chassis load without disruption.
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