Name: Honeywell CC-SCMB02 | C300 Memory Backup Assembly |...
Brand: Honeywell

Description

Model: CC-SCMB02
Part Number: 51199932-200
Brand: Honeywell
Series: Experion PKS C300
Core Function: Maintains controller memory during power loss
Type: Memory Backup Assembly / RAM Charger
Key Specs: C300 controller support; rechargeable backup system; redundant power-input architecture
Compatibility: C300 platform; not compatible with C300v5/PCNT05 according to Honeywell system guidance.

Product Introduction

Honeywell CC-SCMB02 is a C300 Memory Backup Assembly used with Honeywell Experion PKS C300 controllers. Its job is specific: preserve controller memory and configuration data when the normal controller power source is interrupted. It is a supporting hardware assembly, not a C300 control processor itself.

This distinction matters during a replacement. Honeywell documentation explicitly states that the newer PCNT05/C300v5 platform requires CC-SCMB05, and that CC-SCMB02 is not compatible with PCNT05. For an existing C300 installation, however, the older backup assembly remains relevant as an MRO spare.

Key Technical Specifications

Parameter	Specification
Model	CC-SCMB02
Part Number	51199932-200
Manufacturer	Honeywell
Product Family	Experion PKS C300
Product Type	Memory Backup Assembly
Primary Function	C300 controller memory backup
Backup System	Rechargeable battery-based assembly
Power Architecture	Redundant input arrangement
Supported Controller	Honeywell C300
Mounting	Panel / rack installation, system dependent
Application	Controller memory retention during power interruption
Replacement Note	Not compatible with PCNT05 / C300v5
Service Status	Legacy C300 support hardware

Published supplier references describe the assembly as a C300 memory-backup or RAM-charger unit, while Honeywell’s own system guidance provides the important compatibility limitation for newer controller generations.

Exact battery chemistry, backup duration, dimensions, and electrical ratings should be confirmed against the applicable Honeywell hardware documentation or the physical nameplate. Third-party listings give conflicting figures, so I would not use those values as the sole engineering reference.

Honeywell CC-SCMB02

Application and Selection Notes

The main application is memory protection for installed Honeywell C300 controllers. If the plant still operates an earlier C300 architecture, keeping a tested spare can be sensible because a failed memory-backup assembly can become a maintenance issue even when the controller itself is still functional.

The important selection question is the controller generation.

For a conventional C300 installation, verify the existing backup assembly and controller part numbers. For a C300v5/PCNT05 migration, do not specify this unit; Honeywell identifies CC-SCMB05 as the required memory-backup module for PCNT05.

Quality Inspection and Shipping

For warehouse or MRO stock, I recommend this inspection sequence:

Incoming inspection: Verify CC-SCMB02, 51199932-200, serial information, connectors, housing, and labels.
Visual inspection: Check the battery/backup assembly for swelling, leakage, corrosion, cracked insulation, or storage damage.
Electrical inspection: Verify applicable input power, connector continuity, and backup-system condition using the approved Honeywell procedure.
Functional test: Where a compatible C300 test setup is available, verify the backup assembly under controlled conditions.
Final QC: Record the inspection results, photograph the nameplate, apply the QC record, and use appropriate protective packaging.

For long-term storage, battery condition deserves particular attention. A visually clean spare is not automatically a serviceable spare.

Common Replacement Pitfalls

C300 vs PCNT05: This is the big one. Honeywell states that CC-SCMB02 is not compatible with PCNT05. Use CC-SCMB05 for that newer platform.

Wrong part number: Confirm both the model code and 51199932-200 on the actual unit.

Battery condition: A backup assembly can sit in inventory for years. Check storage history and battery condition rather than relying only on packaging appearance.

Power configuration: Verify the existing cable and power arrangement before installation.

Controller generation: Do not select a replacement simply because the connector looks similar. Check the C300 hardware revision and system architecture.

Personally, I would photograph the old backup assembly and its connection arrangement before removal. Then compare the replacement label side by side. It takes minutes and can prevent a very unnecessary commissioning delay.