Honeywell 51303948-100 (MU-PSRB04) 48VDC UCN Battery Backup Assembly

Honeywell 51303948-100, part number alias MU-PSRB04, is a complete pre-assembled 48V DC backup battery rack exclusively designed for 

Honeywell TDC3000 / TPS DCS UCN control cabinet, matched with HPM & APM process controllers. It consists of four sealed lead-acid batteries, dedicated mounting bracket, 

internal wiring harness and quick-disconnect terminal connector. Once the main AC power supply fails unexpectedly, this unit instantly supplies uninterrupted backup power to 

HPM/APM controllers and IOP modules, retaining critical process configuration data, preventing controller offline, control loop dropout and production trip.

 Fully charged batteries can sustain around 20 minutes continuous operation for redundant HPM cabinet with 40 IOPs, allowing operators to safely stabilize process or restore main power supply. 

It is an essential power backup spare part for overhaul and maintenance of petrochemical, power plant legacy Honeywell distributed control systems.

Technical Specifications

Part Number: 51303948-100

Alias Model: MU-PSRB04

Manufacturer: Honeywell

Type: 48VDC UCN Controller Backup Battery Assembly

Battery Configuration: Four 12V sealed rechargeable lead-acid batteries, series connected to 48VDC total output

Single Battery Spec: 12V, 12Ah

Backup Duration: ~20 mins (full charge, standard redundant HPM cabinet load)

Connector Type: Quick-disconnect plug for safe maintenance replacement

Overall Dimension: 286mm × 308mm × 105mm

Net Weight: Approx. 10 kg

Operating Temperature: -20°C ~ +60°C

Humidity: 5%–95% non-condensing

Protection Grade: IP20 (cabinet internal installation)

Revision Version: Rev B

Origin: USA

Certification: CE, UL

 Key Features

Integrated pre-wired battery rack assembly, ready for direct cabinet installation without extra wiring work.

Automatic seamless switchover during main power loss, no interruption to controller operation and data storage.

Quick-disconnect plug design supports safe single-unit replacement without powering down whole cabinet.

Metal anti-vibration mounting structure adapts vibration and dusty environment inside industrial control room cabinets.

Exact original replacement for UCN HPM/APM backup power system, fully compatible with all TDC3000 & TPS generation controllers.

Application Scope

Mainly deployed in thermal power, oil & gas refinery, chemical, metallurgy industries, used as emergency backup power for Honeywell TDC3000, 

TPS DCS UCN network HPM high-performance process manager and APM advanced process manager cabinets, preventing system crash and data loss caused by instantaneous power outage.