KOBERLEIN RMA-POWER-BOX 107/230 Retrofit Safety Power Module

KOBERLEIN RMA-POWER-BOX 107/230: Retrofit-Compatible Ruggedized Safety Power Module for Legacy Control Systems

The KOBERLEIN RMA-POWER-BOX 107/230 is a ruggedized, safety-rated DC power supply module engineered for demanding industrial environments where legacy control infrastructure must be preserved, upgraded, or migrated without full system replacement. Designed as a direct retrofit solution for aging control cabinets, this unit delivers stable, regulated power output compatible with a wide range of discontinued and end-of-life automation platforms. Whether you are replacing a failed power supply in a legacy KOBERLEIN RMA series control rack, upgrading an aging safety relay panel, or consolidating power distribution across a modernized control cabinet, the RMA-POWER-BOX 107/230 provides the electrical performance and mechanical form factor required for a smooth, low-risk transition.

Industrial facilities operating legacy programmable logic controllers, safety interlock systems, and distributed I/O architectures frequently encounter the challenge of sourcing replacement power modules for discontinued product lines. The RMA-POWER-BOX 107/230 addresses this directly by maintaining backward-compatible terminal layouts, standard DIN rail mounting geometry, and input voltage acceptance across the 107–230 VAC range, making it suitable for both 110 V North American installations and 230 V European and Asian grid environments. This dual-voltage flexibility significantly reduces the engineering overhead associated with cross-regional spare parts programs and simplifies global inventory management for maintenance teams responsible for multi-site automation assets.

When integrating the RMA-POWER-BOX 107/230 into an existing control cabinet, engineers should verify the available rail space against the module’s physical footprint before committing to installation. In densely populated cabinets housing components such as KOBERLEIN RMA-RELAY safety relay modules, RMA-IO distributed input/output expansion units, and RMA-COM communication interface cards, clearance for heat dissipation and terminal access must be confirmed. The module’s output current capacity should be cross-referenced against the aggregate load of all downstream devices on the same power bus, including any connected RMA-HMI operator panels, RMA-CPU controller modules, and third-party signal isolators sharing the same 24 VDC rail.

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

A successful retrofit using the RMA-POWER-BOX 107/230 begins with a thorough audit of the existing control cabinet’s power architecture. Maintenance engineers should document the current power supply’s output current rating, the number and type of loads connected to the 24 VDC bus, and the physical wiring topology before removing the failed or obsolete unit. In systems where the original power module also supplied power to a KOBERLEIN RMA-BACKPLANE backplane assembly or a multi-slot RMA-RACK chassis, it is essential to confirm that the replacement unit’s output current capacity covers the combined draw of all installed modules, including any RMA-DI digital input modules, RMA-DO digital output modules, and RMA-AI analog input cards populated in the rack.

Terminal wiring during retrofit should follow the original cabinet’s wiring diagram precisely. Where original documentation is unavailable, engineers should trace each conductor from the existing power module’s output terminals to its downstream device before disconnection, photographing the terminal layout as a reference. The RMA-POWER-BOX 107/230’s screw-clamp terminal block accepts standard industrial wire gauges, and in most cases the existing wire harness can be reused without modification, provided conductor insulation is in good condition and terminal torque specifications are observed.

For control cabinets that also house third-party components — such as Siemens SITOP power supplies on adjacent DIN rail sections, Phoenix Contact signal isolators, or Weidmüller terminal blocks — the RMA-POWER-BOX 107/230’s standard form factor ensures mechanical compatibility without requiring cabinet modifications. Where the original power module was integrated with a safety interlock circuit monitored by a KOBERLEIN RMA-SAFETY safety relay or an equivalent third-party safety controller, the replacement unit’s output voltage stability and ripple characteristics should be verified against the safety device’s input specifications before the system is returned to service.

In facilities undergoing broader control system modernization — for example, migrating from legacy serial communication protocols to PROFINET or EtherNet/IP — the RMA-POWER-BOX 107/230 can serve as the stable power foundation for a phased upgrade. New communication modules, updated I/O expansion units, and replacement HMI panels can be introduced incrementally while the power infrastructure remains consistent, reducing the risk of cascading failures during the transition period. This approach is particularly valuable in continuous-process industries where unplanned downtime carries significant production and safety consequences.

Downtime Control During System Migration

Minimizing control system downtime during a power module replacement requires careful pre-staging and a disciplined commissioning sequence. Before the maintenance window begins, the replacement RMA-POWER-BOX 107/230 should be bench-tested under a representative load to confirm output voltage, current delivery, and protection circuit behavior. All replacement terminals, wire ferrules, and mounting hardware should be prepared in advance so that the physical swap can be completed within the planned outage window.

Where the control system supports it, the existing PLC program logic should be backed up to an offline storage medium before any hardware changes are made. For systems running on KOBERLEIN RMA-CPU controller modules or equivalent third-party PLCs, this backup ensures that program logic, I/O mapping, and communication parameters can be restored immediately if the commissioning process encounters unexpected issues. HMI screen configurations and alarm setpoints stored in connected RMA-HMI panels should similarly be exported and archived before the retrofit begins.

During the physical replacement, the sequence of disconnection and reconnection should follow a defined procedure: isolate the incoming AC supply, discharge any capacitive loads on the 24 VDC bus, remove the failed module, install the RMA-POWER-BOX 107/230, reconnect all DC output terminals in the documented order, and restore AC power before reconnecting downstream devices one section at a time. This staged reconnection approach allows the commissioning engineer to verify output voltage stability at each step and identify any wiring errors before they propagate to sensitive downstream components such as safety relays, encoder interfaces, or communication gateways.

Post-installation, a functional test of all I/O points, safety interlock circuits, and communication links should be completed before the system is returned to automatic operation. Where the control system interfaces with upstream SCADA or DCS platforms via Modbus RTU, PROFIBUS DP, or OPC-UA, the communication link should be verified end-to-end to confirm that data exchange has resumed correctly and that no alarm conditions have been latched in the supervisory system as a result of the power interruption.

Retrofit Support FAQ

Q: Is the RMA-POWER-BOX 107/230 a direct replacement for the original KOBERLEIN RMA series power module in my control cabinet?
A: The RMA-POWER-BOX 107/230 is designed as a retrofit-compatible replacement for KOBERLEIN RMA series power modules with equivalent output voltage and current ratings. Before installation, confirm that the replacement unit’s output current capacity meets or exceeds the aggregate load of all downstream devices in your cabinet. Terminal layout and DIN rail mounting dimensions are consistent with the RMA series standard, allowing direct installation in most existing cabinet configurations without mechanical modification.

Q: What wiring checks should I perform before powering up the replacement module?
A: Verify that all DC output terminals are connected to the correct downstream devices and that conductor polarity is correct. Confirm that the AC input terminals are wired to the correct phase and neutral conductors and that the protective earth connection is secure. Check that no conductors are pinched under terminal screws and that all ferrules are properly crimped. Measure insulation resistance between the AC input and DC output circuits before applying power if the cabinet has been exposed to moisture or contamination.

Q: Can I use the RMA-POWER-BOX 107/230 in a system that is being migrated to a new communication protocol?
A: Yes. The RMA-POWER-BOX 107/230 is a standalone power module with no embedded communication interface, making it protocol-agnostic. It will continue to supply stable 24 VDC power to your control system regardless of whether the communication architecture is being migrated from legacy serial protocols to PROFINET, EtherNet/IP, or any other modern industrial Ethernet standard. New communication modules can be added to the cabinet alongside the RMA-POWER-BOX 107/230 without any interaction or conflict.

Q: What does the 12-month warranty cover, and how is stock availability managed?
A: Every RMA-POWER-BOX 107/230 unit supplied by NINERMAS is tested prior to shipment and covered by a 12-month warranty against manufacturing defects from the date of delivery. In the event of a warranty claim, NINERMAS will arrange replacement or repair of the defective unit. Stock is maintained to support both immediate spare parts requirements and long-term procurement programs for customers managing multi-site automation assets. Contact our team to discuss scheduled delivery, consignment stock arrangements, or long-term supply agreements for critical spare parts.