Allen-Bradley 1756-PH75 ControlLogix Power Supply 125V DC

Technical Specifications Breakdown

Key parameters for the 1756-PH75 are listed below for quick reference:

Industry Applications

Process Control with High DC Availability

In facilities where 125V DC backup power is standard—such as power generation, oil and gas, or chemical plants—the 1756-PH75 directly taps into existing battery banks. This eliminates the need for AC-to-DC conversion, reducing points of failure and improving overall system reliability.

Discrete Manufacturing with Remote I/O Racks

For distributed control panels housing 1756-A7 or 1756-A10 chassis, this power supply provides the 5V/13A rail needed for digital and analog I/O modules. Its 75W output at 60°C ensures adequate headroom for typical mixed-load configurations.

Installation & Setup Guidance

Mount the 1756-PH75 in the leftmost slot of a compatible ControlLogix Series B chassis (e.g., 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17). Use 2.5mm² stranded or solid copper wire with insulation rated at 90°C. Torque conductors to 0.8 N·m (7 lb·in). Ensure the DC input is within the 90-143V DC range before powering up. The module is designed for chassis mounting only; no additional enclosure is required.

Maintenance & Reliability

Inspect power connections and wiring insulation periodically—especially in high-vibration or high-humidity environments. The 1756-PH75 is tested to withstand 30G operational shock and 2G vibration, with non-operating shock tolerance up to 50G. Keep ambient temperature below 60°C and relative humidity between 5-95% non-condensing to ensure long service life.

Reliable DC Power for ControlLogix Systems

Industrial automation systems demand stable, clean power to maintain uptime and protect sensitive backplane communications. The Allen-Bradley 1756-PH75 ControlLogix power supply addresses this need by converting a nominal 125V DC input into the precise voltages required by ControlLogix modules. Designed for standard Series B chassis, this unit ensures consistent operation even in demanding environments.

Compatibility & Integration

It provides isolated power to the backplane with an isolation voltage of 250V between input and backplane, reinforced insulation tested at 3500V DC for 60 seconds. The module supports a maximum current of 1.5A at 1.2V, 4A at 3.3V, 13A at 5.1V, and 2.8A at 24V DC—load-dependent values that match typical module requirements.

Selection Guide & Purchasing Advice

When selecting a replacement or new power supply for your ControlLogix system, verify chassis compatibility and input voltage. AutoDCSTech stocks this unit and can confirm current lifecycle status and availability before ordering. Contact our team for fast quotes and technical support.