24V DC Power Supply 1756-PB72K Allen Bradley

Product Overview

The Allen-Bradley 1756-PB72K is a conformal-coated 24 V DC input power supply for ControlLogix chassis. It delivers 10 A at 5 V DC and 4 A at 3.3 V DC to the backplane, providing reliable power for standard and conformal-coated ControlLogix systems.

Key Specs

• Input voltage: 19.2-32 V DC (nominal 24 V DC)
• Output current: 10 A @ 5 V DC, 4 A @ 3.3 V DC
• Output power: 75 W
• Frequency rating: 47-63 Hz (for AC variants)
• Redundant configuration: Not supported (use 1756-PB75R for redundancy)
• Conformal coating: Yes

Why Choose This

• Conformal coating protects against corrosive industrial atmospheres
• 10 A backplane capacity supports fully loaded chassis configurations
• 24 V DC input suits standard industrial control voltage systems
• Direct chassis mounting with keyed insertion

Common Questions

• What is the difference between PB72K and PB72? The PB72K features conformal coating for harsh environments; the PB72 is the standard version.
• Can it be used in redundant power configurations? No, use the 1756-PB75R with the 1756-PSCA2 chassis adapter for redundant power.
• Which chassis are compatible? All standard and conformal-coated 1756-A4, A7, A10, A13, and A17 chassis.

Mounting Steps

1. Power down the chassis completely.
2. Align the supply with the leftmost power supply slot.
3. Slide into position until the locking mechanism engages.
4. Connect 24 V DC input power to the terminals.
5. Verify the status LED indicates normal operation.

Buying Advice

• Select 1756-PB72K for corrosive environments requiring 24 V DC input power.
• For AC input applications, choose the 1756-PA72K.
• Calculate total backplane load: 10 A at 5 V DC supports up to 17 fully loaded slots.