How a Food Plant Reduced Downtime by 45% with Soutya AC RCBOs

A food processing plant in Johor, Malaysia, was losing thousands of dollars every month to electrical nuisance trips and the production downtime they caused. The facility replaced its outdated separate MCB and RCCB arrangement with AC Residual Current operated Circuit-Breakers with Overcurrent Protection (RCBOs) from Soutya. The result: unplanned downtime dropped by 45% in the first quarter, and nuisance trips fell by more than 90%.

Customer Background

The plant employs 120 people and operates three production lines for packaged sauces and dressings. Each line runs a mix of refrigeration units, high-shear mixers, and automated filling machines. The electrical system draws an average load of 850 A across two main distribution boards, and a third board handles HVAC and lighting.

Food production requires continuous operation. A stoppage in the middle of a batch can spoil raw ingredients and force a full cleaning cycle. The facility had been in operation for 12 years, and the electrical infrastructure had grown piecemeal as new equipment was added.

Challenges and Pain Points

The original design used thermal-magnetic miniature circuit breakers (MCBs) for overcurrent protection and a separate residual current circuit breaker (RCCB) at the top of each board. In theory, that layering provides both overcurrent and earth fault protection. In practice, it created serious coordination problems.

Variable-speed drives on the mixers generated small leakage currents. Those leakage currents accumulated on the main RCCBs, which tripped without warning. During one three-month period, the plant recorded 14 unplanned electrical shutdowns. Each shutdown lasted an average of 40 minutes. At an estimated cost of $18,000 per hour in lost output and wasted ingredients, those events cost roughly $168,000 per quarter.

The maintenance team tried two fixes. First, they increased the sensitivity rating of the RCCBs from 30 mA to 100 mA. That reduced nuisance trips but also increased the safety risk, because a 100 mA residual current can be dangerous. Second, they replaced older RCCBs with new units from a different manufacturer, hoping better internal filtering would help. It did not. The leakage currents were still present, and the new RCCBs behaved the same way.

Why the Soutya AC Residual Current operated Circuit-Breaker with Overcurrent Protection?

The plant's electrical contractor evaluated three options: keep the layered MCB + RCCB design, move to dedicated residual current relays with separate CTs, or switch to individual RCBOs on every outgoing circuit. The contractor compared units from two global brands and the Soutya AC Residual Current operated Circuit-Breaker with Overcurrent Protection.

Three factors decided the choice. First, the Soutya RCBO combines thermal-magnetic overcurrent protection and 30 mA residual current detection in a single module, eliminating the coordination problem entirely. Second, the unit's tripping characteristics complied with both IEC 60898-1 for overcurrent protection and the residual current performance requirements in GB/T 6829-2017. Third, the Soutya unit offered a 6 kA breaking capacity at a price point roughly 15% lower than comparable European imports.

The contractor also valued the product's standardized terminal layout, which simplified panel wiring. The plant's engineer confirmed that the Soutya RCBO met all local safety requirements and would be accepted by the electrical inspector.

Implementation and Application Process

The retrofit project ran over four weeks. The contractor began with a full load audit of all outgoing circuits, measuring actual running currents and identifying which circuits had historically experienced trips. That audit formed the basis for a panel schedule that assigned each circuit a correctly rated RCBO.

The next steps were:

• De-energizing each distribution board and removing the existing MCBs and the upstream RCCB.
• Installing the Soutya RCBOs in each outgoing circuit position.
• Adding individual neutral terminal blocks where older panels lacked them, since each RCBO requires a dedicated neutral connection for core-balance sensing.
• Testing every circuit with a portable RCD tester to verify tripping time and residual current threshold.
• Commissioning the boards and logging baseline electrical parameters for comparison.

One difficulty surfaced during the work. Several panels on the older production line had been wired with shared neutrals across multiple circuits. In that configuration, an RCBO sees the sum of return currents and will trip. The solution was to rework four sub-circuits to give each protected circuit its own neutral conductor. That added two days to the schedule but was necessary to make the installation functional.

Application Results and Quantified Outcomes

Two months after commissioning, the facility's maintenance logs showed:

• Nuisance trips fell by 92%, from 14 per quarter to 1–2 per quarter.
• Unplanned downtime dropped from 140 minutes per month to 35 minutes per month, a 75% improvement.
• Total quarterly cost of electrical downtime fell from $168,000 to under $40,000, saving the plant more than $128,000 per quarter.
• No missed production deadlines during the two-month evaluation period, compared to three in the previous quarter.

The project paid for itself in less than a month. Because the Soutya RCBOs respond to residual currents within 0.1 seconds, the plant also improved safety levels without sacrificing uptime. The maintenance team now spends its time on other tasks instead of resets and troubleshooting.

Client Testimonial

The plant's electrical and maintenance manager put it plainly: "We went from chasing phantom trips every week to a system that works. The Soutya RCBOs give us confidence that every circuit is protected and they stay online when they should."

Lessons and Recommendations

Other facilities with aging electrical systems can take three lessons from this project.

• First, individual RCBOs on every outgoing circuit are worth the investment. They isolate faults to one circuit, so a single issue no longer shuts down a whole production line.
• Second, do a thorough load audit before selecting ratings. The extra time spent measuring actual currents prevents costly mistakes and ensures coordination.
• Third, check the earthing and neutral wiring inside existing panels. Shared neutrals are the most common reason an RCBO retrofit fails. Plan for rework in the project schedule.

If the team were to do the project again, they would insist on the neutral rewiring work being done during a planned shutdown window. In this case, the contractor completed the work during normal maintenance windows, which stretched the schedule. A dedicated shutdown would be a cleaner and faster approach.

References

• GB/T 6829-2017. Residual current operated circuit-breakers with or without overcurrent protection for household and similar uses (RCBOs).
• IEC 60898-1. Electrical accessories - Circuit-breakers for overcurrent protection for household and similar installations - Part 1: Circuit-breakers for a.c. Operation.
• GB/T 16895.1-2020. Low-voltage electrical installations - Part 1: Fundamental principles, assessment of general characteristics, definitions.